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2989 lines
79 KiB
2989 lines
79 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* builtin-record.c |
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* |
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* Builtin record command: Record the profile of a workload |
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* (or a CPU, or a PID) into the perf.data output file - for |
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* later analysis via perf report. |
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*/ |
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#include "builtin.h" |
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|
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#include "util/build-id.h" |
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#include <subcmd/parse-options.h> |
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#include "util/parse-events.h" |
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#include "util/config.h" |
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|
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#include "util/callchain.h" |
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#include "util/cgroup.h" |
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#include "util/header.h" |
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#include "util/event.h" |
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#include "util/evlist.h" |
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#include "util/evsel.h" |
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#include "util/debug.h" |
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#include "util/mmap.h" |
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#include "util/target.h" |
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#include "util/session.h" |
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#include "util/tool.h" |
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#include "util/symbol.h" |
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#include "util/record.h" |
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#include "util/cpumap.h" |
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#include "util/thread_map.h" |
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#include "util/data.h" |
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#include "util/perf_regs.h" |
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#include "util/auxtrace.h" |
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#include "util/tsc.h" |
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#include "util/parse-branch-options.h" |
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#include "util/parse-regs-options.h" |
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#include "util/perf_api_probe.h" |
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#include "util/llvm-utils.h" |
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#include "util/bpf-loader.h" |
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#include "util/trigger.h" |
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#include "util/perf-hooks.h" |
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#include "util/cpu-set-sched.h" |
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#include "util/synthetic-events.h" |
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#include "util/time-utils.h" |
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#include "util/units.h" |
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#include "util/bpf-event.h" |
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#include "util/util.h" |
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#include "util/pfm.h" |
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#include "util/clockid.h" |
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#include "util/pmu-hybrid.h" |
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#include "util/evlist-hybrid.h" |
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#include "asm/bug.h" |
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#include "perf.h" |
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|
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#include <errno.h> |
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#include <inttypes.h> |
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#include <locale.h> |
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#include <poll.h> |
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#include <pthread.h> |
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#include <unistd.h> |
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#include <sched.h> |
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#include <signal.h> |
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#ifdef HAVE_EVENTFD_SUPPORT |
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#include <sys/eventfd.h> |
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#endif |
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#include <sys/mman.h> |
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#include <sys/wait.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <linux/err.h> |
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#include <linux/string.h> |
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#include <linux/time64.h> |
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#include <linux/zalloc.h> |
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#include <linux/bitmap.h> |
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#include <sys/time.h> |
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|
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struct switch_output { |
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bool enabled; |
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bool signal; |
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unsigned long size; |
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unsigned long time; |
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const char *str; |
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bool set; |
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char **filenames; |
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int num_files; |
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int cur_file; |
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}; |
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|
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struct record { |
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struct perf_tool tool; |
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struct record_opts opts; |
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u64 bytes_written; |
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struct perf_data data; |
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struct auxtrace_record *itr; |
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struct evlist *evlist; |
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struct perf_session *session; |
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struct evlist *sb_evlist; |
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pthread_t thread_id; |
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int realtime_prio; |
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bool switch_output_event_set; |
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bool no_buildid; |
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bool no_buildid_set; |
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bool no_buildid_cache; |
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bool no_buildid_cache_set; |
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bool buildid_all; |
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bool buildid_mmap; |
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bool timestamp_filename; |
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bool timestamp_boundary; |
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struct switch_output switch_output; |
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unsigned long long samples; |
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struct mmap_cpu_mask affinity_mask; |
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unsigned long output_max_size; /* = 0: unlimited */ |
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struct perf_debuginfod debuginfod; |
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}; |
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|
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static volatile int done; |
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|
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static volatile int auxtrace_record__snapshot_started; |
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static DEFINE_TRIGGER(auxtrace_snapshot_trigger); |
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static DEFINE_TRIGGER(switch_output_trigger); |
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|
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static const char *affinity_tags[PERF_AFFINITY_MAX] = { |
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"SYS", "NODE", "CPU" |
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}; |
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|
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static bool switch_output_signal(struct record *rec) |
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{ |
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return rec->switch_output.signal && |
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trigger_is_ready(&switch_output_trigger); |
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} |
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|
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static bool switch_output_size(struct record *rec) |
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{ |
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return rec->switch_output.size && |
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trigger_is_ready(&switch_output_trigger) && |
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(rec->bytes_written >= rec->switch_output.size); |
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} |
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|
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static bool switch_output_time(struct record *rec) |
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{ |
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return rec->switch_output.time && |
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trigger_is_ready(&switch_output_trigger); |
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} |
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|
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static bool record__output_max_size_exceeded(struct record *rec) |
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{ |
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return rec->output_max_size && |
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(rec->bytes_written >= rec->output_max_size); |
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} |
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|
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static int record__write(struct record *rec, struct mmap *map __maybe_unused, |
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void *bf, size_t size) |
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{ |
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struct perf_data_file *file = &rec->session->data->file; |
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|
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if (perf_data_file__write(file, bf, size) < 0) { |
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pr_err("failed to write perf data, error: %m\n"); |
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return -1; |
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} |
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|
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rec->bytes_written += size; |
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|
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if (record__output_max_size_exceeded(rec) && !done) { |
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fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB)," |
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" stopping session ]\n", |
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rec->bytes_written >> 10); |
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done = 1; |
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} |
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|
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if (switch_output_size(rec)) |
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trigger_hit(&switch_output_trigger); |
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|
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return 0; |
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} |
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|
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static int record__aio_enabled(struct record *rec); |
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static int record__comp_enabled(struct record *rec); |
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static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size, |
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void *src, size_t src_size); |
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|
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#ifdef HAVE_AIO_SUPPORT |
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static int record__aio_write(struct aiocb *cblock, int trace_fd, |
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void *buf, size_t size, off_t off) |
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{ |
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int rc; |
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|
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cblock->aio_fildes = trace_fd; |
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cblock->aio_buf = buf; |
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cblock->aio_nbytes = size; |
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cblock->aio_offset = off; |
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cblock->aio_sigevent.sigev_notify = SIGEV_NONE; |
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|
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do { |
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rc = aio_write(cblock); |
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if (rc == 0) { |
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break; |
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} else if (errno != EAGAIN) { |
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cblock->aio_fildes = -1; |
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pr_err("failed to queue perf data, error: %m\n"); |
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break; |
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} |
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} while (1); |
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|
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return rc; |
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} |
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|
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static int record__aio_complete(struct mmap *md, struct aiocb *cblock) |
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{ |
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void *rem_buf; |
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off_t rem_off; |
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size_t rem_size; |
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int rc, aio_errno; |
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ssize_t aio_ret, written; |
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aio_errno = aio_error(cblock); |
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if (aio_errno == EINPROGRESS) |
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return 0; |
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written = aio_ret = aio_return(cblock); |
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if (aio_ret < 0) { |
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if (aio_errno != EINTR) |
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pr_err("failed to write perf data, error: %m\n"); |
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written = 0; |
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} |
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rem_size = cblock->aio_nbytes - written; |
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|
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if (rem_size == 0) { |
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cblock->aio_fildes = -1; |
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/* |
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* md->refcount is incremented in record__aio_pushfn() for |
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* every aio write request started in record__aio_push() so |
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* decrement it because the request is now complete. |
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*/ |
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perf_mmap__put(&md->core); |
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rc = 1; |
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} else { |
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/* |
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* aio write request may require restart with the |
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* reminder if the kernel didn't write whole |
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* chunk at once. |
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*/ |
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rem_off = cblock->aio_offset + written; |
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rem_buf = (void *)(cblock->aio_buf + written); |
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record__aio_write(cblock, cblock->aio_fildes, |
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rem_buf, rem_size, rem_off); |
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rc = 0; |
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} |
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|
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return rc; |
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} |
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|
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static int record__aio_sync(struct mmap *md, bool sync_all) |
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{ |
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struct aiocb **aiocb = md->aio.aiocb; |
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struct aiocb *cblocks = md->aio.cblocks; |
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struct timespec timeout = { 0, 1000 * 1000 * 1 }; /* 1ms */ |
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int i, do_suspend; |
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|
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do { |
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do_suspend = 0; |
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for (i = 0; i < md->aio.nr_cblocks; ++i) { |
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if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) { |
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if (sync_all) |
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aiocb[i] = NULL; |
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else |
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return i; |
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} else { |
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/* |
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* Started aio write is not complete yet |
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* so it has to be waited before the |
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* next allocation. |
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*/ |
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aiocb[i] = &cblocks[i]; |
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do_suspend = 1; |
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} |
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} |
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if (!do_suspend) |
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return -1; |
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|
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while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) { |
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if (!(errno == EAGAIN || errno == EINTR)) |
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pr_err("failed to sync perf data, error: %m\n"); |
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} |
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} while (1); |
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} |
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|
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struct record_aio { |
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struct record *rec; |
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void *data; |
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size_t size; |
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}; |
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|
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static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size) |
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{ |
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struct record_aio *aio = to; |
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|
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/* |
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* map->core.base data pointed by buf is copied into free map->aio.data[] buffer |
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* to release space in the kernel buffer as fast as possible, calling |
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* perf_mmap__consume() from perf_mmap__push() function. |
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* |
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* That lets the kernel to proceed with storing more profiling data into |
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* the kernel buffer earlier than other per-cpu kernel buffers are handled. |
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* |
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* Coping can be done in two steps in case the chunk of profiling data |
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* crosses the upper bound of the kernel buffer. In this case we first move |
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* part of data from map->start till the upper bound and then the reminder |
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* from the beginning of the kernel buffer till the end of the data chunk. |
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*/ |
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|
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if (record__comp_enabled(aio->rec)) { |
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size = zstd_compress(aio->rec->session, aio->data + aio->size, |
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mmap__mmap_len(map) - aio->size, |
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buf, size); |
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} else { |
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memcpy(aio->data + aio->size, buf, size); |
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} |
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|
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if (!aio->size) { |
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/* |
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* Increment map->refcount to guard map->aio.data[] buffer |
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* from premature deallocation because map object can be |
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* released earlier than aio write request started on |
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* map->aio.data[] buffer is complete. |
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* |
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* perf_mmap__put() is done at record__aio_complete() |
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* after started aio request completion or at record__aio_push() |
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* if the request failed to start. |
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*/ |
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perf_mmap__get(&map->core); |
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} |
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aio->size += size; |
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|
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return size; |
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} |
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|
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static int record__aio_push(struct record *rec, struct mmap *map, off_t *off) |
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{ |
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int ret, idx; |
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int trace_fd = rec->session->data->file.fd; |
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struct record_aio aio = { .rec = rec, .size = 0 }; |
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|
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/* |
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* Call record__aio_sync() to wait till map->aio.data[] buffer |
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* becomes available after previous aio write operation. |
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*/ |
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|
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idx = record__aio_sync(map, false); |
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aio.data = map->aio.data[idx]; |
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ret = perf_mmap__push(map, &aio, record__aio_pushfn); |
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if (ret != 0) /* ret > 0 - no data, ret < 0 - error */ |
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return ret; |
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|
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rec->samples++; |
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ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off); |
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if (!ret) { |
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*off += aio.size; |
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rec->bytes_written += aio.size; |
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if (switch_output_size(rec)) |
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trigger_hit(&switch_output_trigger); |
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} else { |
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/* |
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* Decrement map->refcount incremented in record__aio_pushfn() |
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* back if record__aio_write() operation failed to start, otherwise |
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* map->refcount is decremented in record__aio_complete() after |
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* aio write operation finishes successfully. |
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*/ |
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perf_mmap__put(&map->core); |
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} |
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|
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return ret; |
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} |
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|
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static off_t record__aio_get_pos(int trace_fd) |
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{ |
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return lseek(trace_fd, 0, SEEK_CUR); |
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} |
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|
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static void record__aio_set_pos(int trace_fd, off_t pos) |
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{ |
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lseek(trace_fd, pos, SEEK_SET); |
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} |
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|
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static void record__aio_mmap_read_sync(struct record *rec) |
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{ |
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int i; |
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struct evlist *evlist = rec->evlist; |
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struct mmap *maps = evlist->mmap; |
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|
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if (!record__aio_enabled(rec)) |
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return; |
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|
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for (i = 0; i < evlist->core.nr_mmaps; i++) { |
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struct mmap *map = &maps[i]; |
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|
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if (map->core.base) |
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record__aio_sync(map, true); |
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} |
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} |
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|
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static int nr_cblocks_default = 1; |
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static int nr_cblocks_max = 4; |
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|
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static int record__aio_parse(const struct option *opt, |
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const char *str, |
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int unset) |
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{ |
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struct record_opts *opts = (struct record_opts *)opt->value; |
|
|
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if (unset) { |
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opts->nr_cblocks = 0; |
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} else { |
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if (str) |
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opts->nr_cblocks = strtol(str, NULL, 0); |
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if (!opts->nr_cblocks) |
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opts->nr_cblocks = nr_cblocks_default; |
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} |
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|
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return 0; |
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} |
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#else /* HAVE_AIO_SUPPORT */ |
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static int nr_cblocks_max = 0; |
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|
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static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused, |
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off_t *off __maybe_unused) |
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{ |
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return -1; |
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} |
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|
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static off_t record__aio_get_pos(int trace_fd __maybe_unused) |
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{ |
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return -1; |
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} |
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|
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static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused) |
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{ |
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} |
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|
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static void record__aio_mmap_read_sync(struct record *rec __maybe_unused) |
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{ |
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} |
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#endif |
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|
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static int record__aio_enabled(struct record *rec) |
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{ |
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return rec->opts.nr_cblocks > 0; |
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} |
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|
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#define MMAP_FLUSH_DEFAULT 1 |
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static int record__mmap_flush_parse(const struct option *opt, |
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const char *str, |
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int unset) |
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{ |
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int flush_max; |
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struct record_opts *opts = (struct record_opts *)opt->value; |
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static struct parse_tag tags[] = { |
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{ .tag = 'B', .mult = 1 }, |
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{ .tag = 'K', .mult = 1 << 10 }, |
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{ .tag = 'M', .mult = 1 << 20 }, |
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{ .tag = 'G', .mult = 1 << 30 }, |
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{ .tag = 0 }, |
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}; |
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|
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if (unset) |
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return 0; |
|
|
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if (str) { |
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opts->mmap_flush = parse_tag_value(str, tags); |
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if (opts->mmap_flush == (int)-1) |
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opts->mmap_flush = strtol(str, NULL, 0); |
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} |
|
|
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if (!opts->mmap_flush) |
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opts->mmap_flush = MMAP_FLUSH_DEFAULT; |
|
|
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flush_max = evlist__mmap_size(opts->mmap_pages); |
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flush_max /= 4; |
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if (opts->mmap_flush > flush_max) |
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opts->mmap_flush = flush_max; |
|
|
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return 0; |
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} |
|
|
|
#ifdef HAVE_ZSTD_SUPPORT |
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static unsigned int comp_level_default = 1; |
|
|
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static int record__parse_comp_level(const struct option *opt, const char *str, int unset) |
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{ |
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struct record_opts *opts = opt->value; |
|
|
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if (unset) { |
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opts->comp_level = 0; |
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} else { |
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if (str) |
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opts->comp_level = strtol(str, NULL, 0); |
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if (!opts->comp_level) |
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opts->comp_level = comp_level_default; |
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} |
|
|
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return 0; |
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} |
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#endif |
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static unsigned int comp_level_max = 22; |
|
|
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static int record__comp_enabled(struct record *rec) |
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{ |
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return rec->opts.comp_level > 0; |
|
} |
|
|
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static int process_synthesized_event(struct perf_tool *tool, |
|
union perf_event *event, |
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struct perf_sample *sample __maybe_unused, |
|
struct machine *machine __maybe_unused) |
|
{ |
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struct record *rec = container_of(tool, struct record, tool); |
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return record__write(rec, NULL, event, event->header.size); |
|
} |
|
|
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static int process_locked_synthesized_event(struct perf_tool *tool, |
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union perf_event *event, |
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struct perf_sample *sample __maybe_unused, |
|
struct machine *machine __maybe_unused) |
|
{ |
|
static pthread_mutex_t synth_lock = PTHREAD_MUTEX_INITIALIZER; |
|
int ret; |
|
|
|
pthread_mutex_lock(&synth_lock); |
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ret = process_synthesized_event(tool, event, sample, machine); |
|
pthread_mutex_unlock(&synth_lock); |
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return ret; |
|
} |
|
|
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static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size) |
|
{ |
|
struct record *rec = to; |
|
|
|
if (record__comp_enabled(rec)) { |
|
size = zstd_compress(rec->session, map->data, mmap__mmap_len(map), bf, size); |
|
bf = map->data; |
|
} |
|
|
|
rec->samples++; |
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return record__write(rec, map, bf, size); |
|
} |
|
|
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static volatile int signr = -1; |
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static volatile int child_finished; |
|
#ifdef HAVE_EVENTFD_SUPPORT |
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static int done_fd = -1; |
|
#endif |
|
|
|
static void sig_handler(int sig) |
|
{ |
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if (sig == SIGCHLD) |
|
child_finished = 1; |
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else |
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signr = sig; |
|
|
|
done = 1; |
|
#ifdef HAVE_EVENTFD_SUPPORT |
|
{ |
|
u64 tmp = 1; |
|
/* |
|
* It is possible for this signal handler to run after done is checked |
|
* in the main loop, but before the perf counter fds are polled. If this |
|
* happens, the poll() will continue to wait even though done is set, |
|
* and will only break out if either another signal is received, or the |
|
* counters are ready for read. To ensure the poll() doesn't sleep when |
|
* done is set, use an eventfd (done_fd) to wake up the poll(). |
|
*/ |
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if (write(done_fd, &tmp, sizeof(tmp)) < 0) |
|
pr_err("failed to signal wakeup fd, error: %m\n"); |
|
} |
|
#endif // HAVE_EVENTFD_SUPPORT |
|
} |
|
|
|
static void sigsegv_handler(int sig) |
|
{ |
|
perf_hooks__recover(); |
|
sighandler_dump_stack(sig); |
|
} |
|
|
|
static void record__sig_exit(void) |
|
{ |
|
if (signr == -1) |
|
return; |
|
|
|
signal(signr, SIG_DFL); |
|
raise(signr); |
|
} |
|
|
|
#ifdef HAVE_AUXTRACE_SUPPORT |
|
|
|
static int record__process_auxtrace(struct perf_tool *tool, |
|
struct mmap *map, |
|
union perf_event *event, void *data1, |
|
size_t len1, void *data2, size_t len2) |
|
{ |
|
struct record *rec = container_of(tool, struct record, tool); |
|
struct perf_data *data = &rec->data; |
|
size_t padding; |
|
u8 pad[8] = {0}; |
|
|
|
if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) { |
|
off_t file_offset; |
|
int fd = perf_data__fd(data); |
|
int err; |
|
|
|
file_offset = lseek(fd, 0, SEEK_CUR); |
|
if (file_offset == -1) |
|
return -1; |
|
err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index, |
|
event, file_offset); |
|
if (err) |
|
return err; |
|
} |
|
|
|
/* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */ |
|
padding = (len1 + len2) & 7; |
|
if (padding) |
|
padding = 8 - padding; |
|
|
|
record__write(rec, map, event, event->header.size); |
|
record__write(rec, map, data1, len1); |
|
if (len2) |
|
record__write(rec, map, data2, len2); |
|
record__write(rec, map, &pad, padding); |
|
|
|
return 0; |
|
} |
|
|
|
static int record__auxtrace_mmap_read(struct record *rec, |
|
struct mmap *map) |
|
{ |
|
int ret; |
|
|
|
ret = auxtrace_mmap__read(map, rec->itr, &rec->tool, |
|
record__process_auxtrace); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (ret) |
|
rec->samples++; |
|
|
|
return 0; |
|
} |
|
|
|
static int record__auxtrace_mmap_read_snapshot(struct record *rec, |
|
struct mmap *map) |
|
{ |
|
int ret; |
|
|
|
ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool, |
|
record__process_auxtrace, |
|
rec->opts.auxtrace_snapshot_size); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (ret) |
|
rec->samples++; |
|
|
|
return 0; |
|
} |
|
|
|
static int record__auxtrace_read_snapshot_all(struct record *rec) |
|
{ |
|
int i; |
|
int rc = 0; |
|
|
|
for (i = 0; i < rec->evlist->core.nr_mmaps; i++) { |
|
struct mmap *map = &rec->evlist->mmap[i]; |
|
|
|
if (!map->auxtrace_mmap.base) |
|
continue; |
|
|
|
if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) { |
|
rc = -1; |
|
goto out; |
|
} |
|
} |
|
out: |
|
return rc; |
|
} |
|
|
|
static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit) |
|
{ |
|
pr_debug("Recording AUX area tracing snapshot\n"); |
|
if (record__auxtrace_read_snapshot_all(rec) < 0) { |
|
trigger_error(&auxtrace_snapshot_trigger); |
|
} else { |
|
if (auxtrace_record__snapshot_finish(rec->itr, on_exit)) |
|
trigger_error(&auxtrace_snapshot_trigger); |
|
else |
|
trigger_ready(&auxtrace_snapshot_trigger); |
|
} |
|
} |
|
|
|
static int record__auxtrace_snapshot_exit(struct record *rec) |
|
{ |
|
if (trigger_is_error(&auxtrace_snapshot_trigger)) |
|
return 0; |
|
|
|
if (!auxtrace_record__snapshot_started && |
|
auxtrace_record__snapshot_start(rec->itr)) |
|
return -1; |
|
|
|
record__read_auxtrace_snapshot(rec, true); |
|
if (trigger_is_error(&auxtrace_snapshot_trigger)) |
|
return -1; |
|
|
|
return 0; |
|
} |
|
|
|
static int record__auxtrace_init(struct record *rec) |
|
{ |
|
int err; |
|
|
|
if (!rec->itr) { |
|
rec->itr = auxtrace_record__init(rec->evlist, &err); |
|
if (err) |
|
return err; |
|
} |
|
|
|
err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts, |
|
rec->opts.auxtrace_snapshot_opts); |
|
if (err) |
|
return err; |
|
|
|
err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts, |
|
rec->opts.auxtrace_sample_opts); |
|
if (err) |
|
return err; |
|
|
|
auxtrace_regroup_aux_output(rec->evlist); |
|
|
|
return auxtrace_parse_filters(rec->evlist); |
|
} |
|
|
|
#else |
|
|
|
static inline |
|
int record__auxtrace_mmap_read(struct record *rec __maybe_unused, |
|
struct mmap *map __maybe_unused) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline |
|
void record__read_auxtrace_snapshot(struct record *rec __maybe_unused, |
|
bool on_exit __maybe_unused) |
|
{ |
|
} |
|
|
|
static inline |
|
int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline |
|
int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused) |
|
{ |
|
return 0; |
|
} |
|
|
|
static int record__auxtrace_init(struct record *rec __maybe_unused) |
|
{ |
|
return 0; |
|
} |
|
|
|
#endif |
|
|
|
static int record__config_text_poke(struct evlist *evlist) |
|
{ |
|
struct evsel *evsel; |
|
int err; |
|
|
|
/* Nothing to do if text poke is already configured */ |
|
evlist__for_each_entry(evlist, evsel) { |
|
if (evsel->core.attr.text_poke) |
|
return 0; |
|
} |
|
|
|
err = parse_events(evlist, "dummy:u", NULL); |
|
if (err) |
|
return err; |
|
|
|
evsel = evlist__last(evlist); |
|
|
|
evsel->core.attr.freq = 0; |
|
evsel->core.attr.sample_period = 1; |
|
evsel->core.attr.text_poke = 1; |
|
evsel->core.attr.ksymbol = 1; |
|
|
|
evsel->core.system_wide = true; |
|
evsel->no_aux_samples = true; |
|
evsel->immediate = true; |
|
|
|
/* Text poke must be collected on all CPUs */ |
|
perf_cpu_map__put(evsel->core.own_cpus); |
|
evsel->core.own_cpus = perf_cpu_map__new(NULL); |
|
perf_cpu_map__put(evsel->core.cpus); |
|
evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus); |
|
|
|
evsel__set_sample_bit(evsel, TIME); |
|
|
|
return 0; |
|
} |
|
|
|
static bool record__kcore_readable(struct machine *machine) |
|
{ |
|
char kcore[PATH_MAX]; |
|
int fd; |
|
|
|
scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir); |
|
|
|
fd = open(kcore, O_RDONLY); |
|
if (fd < 0) |
|
return false; |
|
|
|
close(fd); |
|
|
|
return true; |
|
} |
|
|
|
static int record__kcore_copy(struct machine *machine, struct perf_data *data) |
|
{ |
|
char from_dir[PATH_MAX]; |
|
char kcore_dir[PATH_MAX]; |
|
int ret; |
|
|
|
snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir); |
|
|
|
ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir)); |
|
if (ret) |
|
return ret; |
|
|
|
return kcore_copy(from_dir, kcore_dir); |
|
} |
|
|
|
static int record__mmap_evlist(struct record *rec, |
|
struct evlist *evlist) |
|
{ |
|
struct record_opts *opts = &rec->opts; |
|
bool auxtrace_overwrite = opts->auxtrace_snapshot_mode || |
|
opts->auxtrace_sample_mode; |
|
char msg[512]; |
|
|
|
if (opts->affinity != PERF_AFFINITY_SYS) |
|
cpu__setup_cpunode_map(); |
|
|
|
if (evlist__mmap_ex(evlist, opts->mmap_pages, |
|
opts->auxtrace_mmap_pages, |
|
auxtrace_overwrite, |
|
opts->nr_cblocks, opts->affinity, |
|
opts->mmap_flush, opts->comp_level) < 0) { |
|
if (errno == EPERM) { |
|
pr_err("Permission error mapping pages.\n" |
|
"Consider increasing " |
|
"/proc/sys/kernel/perf_event_mlock_kb,\n" |
|
"or try again with a smaller value of -m/--mmap_pages.\n" |
|
"(current value: %u,%u)\n", |
|
opts->mmap_pages, opts->auxtrace_mmap_pages); |
|
return -errno; |
|
} else { |
|
pr_err("failed to mmap with %d (%s)\n", errno, |
|
str_error_r(errno, msg, sizeof(msg))); |
|
if (errno) |
|
return -errno; |
|
else |
|
return -EINVAL; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static int record__mmap(struct record *rec) |
|
{ |
|
return record__mmap_evlist(rec, rec->evlist); |
|
} |
|
|
|
static int record__open(struct record *rec) |
|
{ |
|
char msg[BUFSIZ]; |
|
struct evsel *pos; |
|
struct evlist *evlist = rec->evlist; |
|
struct perf_session *session = rec->session; |
|
struct record_opts *opts = &rec->opts; |
|
int rc = 0; |
|
|
|
/* |
|
* For initial_delay, system wide or a hybrid system, we need to add a |
|
* dummy event so that we can track PERF_RECORD_MMAP to cover the delay |
|
* of waiting or event synthesis. |
|
*/ |
|
if (opts->initial_delay || target__has_cpu(&opts->target) || |
|
perf_pmu__has_hybrid()) { |
|
pos = evlist__get_tracking_event(evlist); |
|
if (!evsel__is_dummy_event(pos)) { |
|
/* Set up dummy event. */ |
|
if (evlist__add_dummy(evlist)) |
|
return -ENOMEM; |
|
pos = evlist__last(evlist); |
|
evlist__set_tracking_event(evlist, pos); |
|
} |
|
|
|
/* |
|
* Enable the dummy event when the process is forked for |
|
* initial_delay, immediately for system wide. |
|
*/ |
|
if (opts->initial_delay && !pos->immediate && |
|
!target__has_cpu(&opts->target)) |
|
pos->core.attr.enable_on_exec = 1; |
|
else |
|
pos->immediate = 1; |
|
} |
|
|
|
evlist__config(evlist, opts, &callchain_param); |
|
|
|
evlist__for_each_entry(evlist, pos) { |
|
try_again: |
|
if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) { |
|
if (evsel__fallback(pos, errno, msg, sizeof(msg))) { |
|
if (verbose > 0) |
|
ui__warning("%s\n", msg); |
|
goto try_again; |
|
} |
|
if ((errno == EINVAL || errno == EBADF) && |
|
pos->core.leader != &pos->core && |
|
pos->weak_group) { |
|
pos = evlist__reset_weak_group(evlist, pos, true); |
|
goto try_again; |
|
} |
|
rc = -errno; |
|
evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg)); |
|
ui__error("%s\n", msg); |
|
goto out; |
|
} |
|
|
|
pos->supported = true; |
|
} |
|
|
|
if (symbol_conf.kptr_restrict && !evlist__exclude_kernel(evlist)) { |
|
pr_warning( |
|
"WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n" |
|
"check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n" |
|
"Samples in kernel functions may not be resolved if a suitable vmlinux\n" |
|
"file is not found in the buildid cache or in the vmlinux path.\n\n" |
|
"Samples in kernel modules won't be resolved at all.\n\n" |
|
"If some relocation was applied (e.g. kexec) symbols may be misresolved\n" |
|
"even with a suitable vmlinux or kallsyms file.\n\n"); |
|
} |
|
|
|
if (evlist__apply_filters(evlist, &pos)) { |
|
pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n", |
|
pos->filter, evsel__name(pos), errno, |
|
str_error_r(errno, msg, sizeof(msg))); |
|
rc = -1; |
|
goto out; |
|
} |
|
|
|
rc = record__mmap(rec); |
|
if (rc) |
|
goto out; |
|
|
|
session->evlist = evlist; |
|
perf_session__set_id_hdr_size(session); |
|
out: |
|
return rc; |
|
} |
|
|
|
static void set_timestamp_boundary(struct record *rec, u64 sample_time) |
|
{ |
|
if (rec->evlist->first_sample_time == 0) |
|
rec->evlist->first_sample_time = sample_time; |
|
|
|
if (sample_time) |
|
rec->evlist->last_sample_time = sample_time; |
|
} |
|
|
|
static int process_sample_event(struct perf_tool *tool, |
|
union perf_event *event, |
|
struct perf_sample *sample, |
|
struct evsel *evsel, |
|
struct machine *machine) |
|
{ |
|
struct record *rec = container_of(tool, struct record, tool); |
|
|
|
set_timestamp_boundary(rec, sample->time); |
|
|
|
if (rec->buildid_all) |
|
return 0; |
|
|
|
rec->samples++; |
|
return build_id__mark_dso_hit(tool, event, sample, evsel, machine); |
|
} |
|
|
|
static int process_buildids(struct record *rec) |
|
{ |
|
struct perf_session *session = rec->session; |
|
|
|
if (perf_data__size(&rec->data) == 0) |
|
return 0; |
|
|
|
/* |
|
* During this process, it'll load kernel map and replace the |
|
* dso->long_name to a real pathname it found. In this case |
|
* we prefer the vmlinux path like |
|
* /lib/modules/3.16.4/build/vmlinux |
|
* |
|
* rather than build-id path (in debug directory). |
|
* $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551 |
|
*/ |
|
symbol_conf.ignore_vmlinux_buildid = true; |
|
|
|
/* |
|
* If --buildid-all is given, it marks all DSO regardless of hits, |
|
* so no need to process samples. But if timestamp_boundary is enabled, |
|
* it still needs to walk on all samples to get the timestamps of |
|
* first/last samples. |
|
*/ |
|
if (rec->buildid_all && !rec->timestamp_boundary) |
|
rec->tool.sample = NULL; |
|
|
|
return perf_session__process_events(session); |
|
} |
|
|
|
static void perf_event__synthesize_guest_os(struct machine *machine, void *data) |
|
{ |
|
int err; |
|
struct perf_tool *tool = data; |
|
/* |
|
*As for guest kernel when processing subcommand record&report, |
|
*we arrange module mmap prior to guest kernel mmap and trigger |
|
*a preload dso because default guest module symbols are loaded |
|
*from guest kallsyms instead of /lib/modules/XXX/XXX. This |
|
*method is used to avoid symbol missing when the first addr is |
|
*in module instead of in guest kernel. |
|
*/ |
|
err = perf_event__synthesize_modules(tool, process_synthesized_event, |
|
machine); |
|
if (err < 0) |
|
pr_err("Couldn't record guest kernel [%d]'s reference" |
|
" relocation symbol.\n", machine->pid); |
|
|
|
/* |
|
* We use _stext for guest kernel because guest kernel's /proc/kallsyms |
|
* have no _text sometimes. |
|
*/ |
|
err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event, |
|
machine); |
|
if (err < 0) |
|
pr_err("Couldn't record guest kernel [%d]'s reference" |
|
" relocation symbol.\n", machine->pid); |
|
} |
|
|
|
static struct perf_event_header finished_round_event = { |
|
.size = sizeof(struct perf_event_header), |
|
.type = PERF_RECORD_FINISHED_ROUND, |
|
}; |
|
|
|
static void record__adjust_affinity(struct record *rec, struct mmap *map) |
|
{ |
|
if (rec->opts.affinity != PERF_AFFINITY_SYS && |
|
!bitmap_equal(rec->affinity_mask.bits, map->affinity_mask.bits, |
|
rec->affinity_mask.nbits)) { |
|
bitmap_zero(rec->affinity_mask.bits, rec->affinity_mask.nbits); |
|
bitmap_or(rec->affinity_mask.bits, rec->affinity_mask.bits, |
|
map->affinity_mask.bits, rec->affinity_mask.nbits); |
|
sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&rec->affinity_mask), |
|
(cpu_set_t *)rec->affinity_mask.bits); |
|
if (verbose == 2) |
|
mmap_cpu_mask__scnprintf(&rec->affinity_mask, "thread"); |
|
} |
|
} |
|
|
|
static size_t process_comp_header(void *record, size_t increment) |
|
{ |
|
struct perf_record_compressed *event = record; |
|
size_t size = sizeof(*event); |
|
|
|
if (increment) { |
|
event->header.size += increment; |
|
return increment; |
|
} |
|
|
|
event->header.type = PERF_RECORD_COMPRESSED; |
|
event->header.size = size; |
|
|
|
return size; |
|
} |
|
|
|
static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size, |
|
void *src, size_t src_size) |
|
{ |
|
size_t compressed; |
|
size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1; |
|
|
|
compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size, |
|
max_record_size, process_comp_header); |
|
|
|
session->bytes_transferred += src_size; |
|
session->bytes_compressed += compressed; |
|
|
|
return compressed; |
|
} |
|
|
|
static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist, |
|
bool overwrite, bool synch) |
|
{ |
|
u64 bytes_written = rec->bytes_written; |
|
int i; |
|
int rc = 0; |
|
struct mmap *maps; |
|
int trace_fd = rec->data.file.fd; |
|
off_t off = 0; |
|
|
|
if (!evlist) |
|
return 0; |
|
|
|
maps = overwrite ? evlist->overwrite_mmap : evlist->mmap; |
|
if (!maps) |
|
return 0; |
|
|
|
if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING) |
|
return 0; |
|
|
|
if (record__aio_enabled(rec)) |
|
off = record__aio_get_pos(trace_fd); |
|
|
|
for (i = 0; i < evlist->core.nr_mmaps; i++) { |
|
u64 flush = 0; |
|
struct mmap *map = &maps[i]; |
|
|
|
if (map->core.base) { |
|
record__adjust_affinity(rec, map); |
|
if (synch) { |
|
flush = map->core.flush; |
|
map->core.flush = 1; |
|
} |
|
if (!record__aio_enabled(rec)) { |
|
if (perf_mmap__push(map, rec, record__pushfn) < 0) { |
|
if (synch) |
|
map->core.flush = flush; |
|
rc = -1; |
|
goto out; |
|
} |
|
} else { |
|
if (record__aio_push(rec, map, &off) < 0) { |
|
record__aio_set_pos(trace_fd, off); |
|
if (synch) |
|
map->core.flush = flush; |
|
rc = -1; |
|
goto out; |
|
} |
|
} |
|
if (synch) |
|
map->core.flush = flush; |
|
} |
|
|
|
if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode && |
|
!rec->opts.auxtrace_sample_mode && |
|
record__auxtrace_mmap_read(rec, map) != 0) { |
|
rc = -1; |
|
goto out; |
|
} |
|
} |
|
|
|
if (record__aio_enabled(rec)) |
|
record__aio_set_pos(trace_fd, off); |
|
|
|
/* |
|
* Mark the round finished in case we wrote |
|
* at least one event. |
|
*/ |
|
if (bytes_written != rec->bytes_written) |
|
rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event)); |
|
|
|
if (overwrite) |
|
evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY); |
|
out: |
|
return rc; |
|
} |
|
|
|
static int record__mmap_read_all(struct record *rec, bool synch) |
|
{ |
|
int err; |
|
|
|
err = record__mmap_read_evlist(rec, rec->evlist, false, synch); |
|
if (err) |
|
return err; |
|
|
|
return record__mmap_read_evlist(rec, rec->evlist, true, synch); |
|
} |
|
|
|
static void record__init_features(struct record *rec) |
|
{ |
|
struct perf_session *session = rec->session; |
|
int feat; |
|
|
|
for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++) |
|
perf_header__set_feat(&session->header, feat); |
|
|
|
if (rec->no_buildid) |
|
perf_header__clear_feat(&session->header, HEADER_BUILD_ID); |
|
|
|
if (!have_tracepoints(&rec->evlist->core.entries)) |
|
perf_header__clear_feat(&session->header, HEADER_TRACING_DATA); |
|
|
|
if (!rec->opts.branch_stack) |
|
perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK); |
|
|
|
if (!rec->opts.full_auxtrace) |
|
perf_header__clear_feat(&session->header, HEADER_AUXTRACE); |
|
|
|
if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns)) |
|
perf_header__clear_feat(&session->header, HEADER_CLOCKID); |
|
|
|
if (!rec->opts.use_clockid) |
|
perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA); |
|
|
|
perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT); |
|
if (!record__comp_enabled(rec)) |
|
perf_header__clear_feat(&session->header, HEADER_COMPRESSED); |
|
|
|
perf_header__clear_feat(&session->header, HEADER_STAT); |
|
} |
|
|
|
static void |
|
record__finish_output(struct record *rec) |
|
{ |
|
struct perf_data *data = &rec->data; |
|
int fd = perf_data__fd(data); |
|
|
|
if (data->is_pipe) |
|
return; |
|
|
|
rec->session->header.data_size += rec->bytes_written; |
|
data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR); |
|
|
|
if (!rec->no_buildid) { |
|
process_buildids(rec); |
|
|
|
if (rec->buildid_all) |
|
dsos__hit_all(rec->session); |
|
} |
|
perf_session__write_header(rec->session, rec->evlist, fd, true); |
|
|
|
return; |
|
} |
|
|
|
static int record__synthesize_workload(struct record *rec, bool tail) |
|
{ |
|
int err; |
|
struct perf_thread_map *thread_map; |
|
bool needs_mmap = rec->opts.synth & PERF_SYNTH_MMAP; |
|
|
|
if (rec->opts.tail_synthesize != tail) |
|
return 0; |
|
|
|
thread_map = thread_map__new_by_tid(rec->evlist->workload.pid); |
|
if (thread_map == NULL) |
|
return -1; |
|
|
|
err = perf_event__synthesize_thread_map(&rec->tool, thread_map, |
|
process_synthesized_event, |
|
&rec->session->machines.host, |
|
needs_mmap, |
|
rec->opts.sample_address); |
|
perf_thread_map__put(thread_map); |
|
return err; |
|
} |
|
|
|
static int record__synthesize(struct record *rec, bool tail); |
|
|
|
static int |
|
record__switch_output(struct record *rec, bool at_exit) |
|
{ |
|
struct perf_data *data = &rec->data; |
|
int fd, err; |
|
char *new_filename; |
|
|
|
/* Same Size: "2015122520103046"*/ |
|
char timestamp[] = "InvalidTimestamp"; |
|
|
|
record__aio_mmap_read_sync(rec); |
|
|
|
record__synthesize(rec, true); |
|
if (target__none(&rec->opts.target)) |
|
record__synthesize_workload(rec, true); |
|
|
|
rec->samples = 0; |
|
record__finish_output(rec); |
|
err = fetch_current_timestamp(timestamp, sizeof(timestamp)); |
|
if (err) { |
|
pr_err("Failed to get current timestamp\n"); |
|
return -EINVAL; |
|
} |
|
|
|
fd = perf_data__switch(data, timestamp, |
|
rec->session->header.data_offset, |
|
at_exit, &new_filename); |
|
if (fd >= 0 && !at_exit) { |
|
rec->bytes_written = 0; |
|
rec->session->header.data_size = 0; |
|
} |
|
|
|
if (!quiet) |
|
fprintf(stderr, "[ perf record: Dump %s.%s ]\n", |
|
data->path, timestamp); |
|
|
|
if (rec->switch_output.num_files) { |
|
int n = rec->switch_output.cur_file + 1; |
|
|
|
if (n >= rec->switch_output.num_files) |
|
n = 0; |
|
rec->switch_output.cur_file = n; |
|
if (rec->switch_output.filenames[n]) { |
|
remove(rec->switch_output.filenames[n]); |
|
zfree(&rec->switch_output.filenames[n]); |
|
} |
|
rec->switch_output.filenames[n] = new_filename; |
|
} else { |
|
free(new_filename); |
|
} |
|
|
|
/* Output tracking events */ |
|
if (!at_exit) { |
|
record__synthesize(rec, false); |
|
|
|
/* |
|
* In 'perf record --switch-output' without -a, |
|
* record__synthesize() in record__switch_output() won't |
|
* generate tracking events because there's no thread_map |
|
* in evlist. Which causes newly created perf.data doesn't |
|
* contain map and comm information. |
|
* Create a fake thread_map and directly call |
|
* perf_event__synthesize_thread_map() for those events. |
|
*/ |
|
if (target__none(&rec->opts.target)) |
|
record__synthesize_workload(rec, false); |
|
} |
|
return fd; |
|
} |
|
|
|
static volatile int workload_exec_errno; |
|
|
|
/* |
|
* evlist__prepare_workload will send a SIGUSR1 |
|
* if the fork fails, since we asked by setting its |
|
* want_signal to true. |
|
*/ |
|
static void workload_exec_failed_signal(int signo __maybe_unused, |
|
siginfo_t *info, |
|
void *ucontext __maybe_unused) |
|
{ |
|
workload_exec_errno = info->si_value.sival_int; |
|
done = 1; |
|
child_finished = 1; |
|
} |
|
|
|
static void snapshot_sig_handler(int sig); |
|
static void alarm_sig_handler(int sig); |
|
|
|
static const struct perf_event_mmap_page *evlist__pick_pc(struct evlist *evlist) |
|
{ |
|
if (evlist) { |
|
if (evlist->mmap && evlist->mmap[0].core.base) |
|
return evlist->mmap[0].core.base; |
|
if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base) |
|
return evlist->overwrite_mmap[0].core.base; |
|
} |
|
return NULL; |
|
} |
|
|
|
static const struct perf_event_mmap_page *record__pick_pc(struct record *rec) |
|
{ |
|
const struct perf_event_mmap_page *pc = evlist__pick_pc(rec->evlist); |
|
if (pc) |
|
return pc; |
|
return NULL; |
|
} |
|
|
|
static int record__synthesize(struct record *rec, bool tail) |
|
{ |
|
struct perf_session *session = rec->session; |
|
struct machine *machine = &session->machines.host; |
|
struct perf_data *data = &rec->data; |
|
struct record_opts *opts = &rec->opts; |
|
struct perf_tool *tool = &rec->tool; |
|
int err = 0; |
|
event_op f = process_synthesized_event; |
|
|
|
if (rec->opts.tail_synthesize != tail) |
|
return 0; |
|
|
|
if (data->is_pipe) { |
|
err = perf_event__synthesize_for_pipe(tool, session, data, |
|
process_synthesized_event); |
|
if (err < 0) |
|
goto out; |
|
|
|
rec->bytes_written += err; |
|
} |
|
|
|
err = perf_event__synth_time_conv(record__pick_pc(rec), tool, |
|
process_synthesized_event, machine); |
|
if (err) |
|
goto out; |
|
|
|
/* Synthesize id_index before auxtrace_info */ |
|
if (rec->opts.auxtrace_sample_mode || rec->opts.full_auxtrace) { |
|
err = perf_event__synthesize_id_index(tool, |
|
process_synthesized_event, |
|
session->evlist, machine); |
|
if (err) |
|
goto out; |
|
} |
|
|
|
if (rec->opts.full_auxtrace) { |
|
err = perf_event__synthesize_auxtrace_info(rec->itr, tool, |
|
session, process_synthesized_event); |
|
if (err) |
|
goto out; |
|
} |
|
|
|
if (!evlist__exclude_kernel(rec->evlist)) { |
|
err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event, |
|
machine); |
|
WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n" |
|
"Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" |
|
"Check /proc/kallsyms permission or run as root.\n"); |
|
|
|
err = perf_event__synthesize_modules(tool, process_synthesized_event, |
|
machine); |
|
WARN_ONCE(err < 0, "Couldn't record kernel module information.\n" |
|
"Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" |
|
"Check /proc/modules permission or run as root.\n"); |
|
} |
|
|
|
if (perf_guest) { |
|
machines__process_guests(&session->machines, |
|
perf_event__synthesize_guest_os, tool); |
|
} |
|
|
|
err = perf_event__synthesize_extra_attr(&rec->tool, |
|
rec->evlist, |
|
process_synthesized_event, |
|
data->is_pipe); |
|
if (err) |
|
goto out; |
|
|
|
err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads, |
|
process_synthesized_event, |
|
NULL); |
|
if (err < 0) { |
|
pr_err("Couldn't synthesize thread map.\n"); |
|
return err; |
|
} |
|
|
|
err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.cpus, |
|
process_synthesized_event, NULL); |
|
if (err < 0) { |
|
pr_err("Couldn't synthesize cpu map.\n"); |
|
return err; |
|
} |
|
|
|
err = perf_event__synthesize_bpf_events(session, process_synthesized_event, |
|
machine, opts); |
|
if (err < 0) |
|
pr_warning("Couldn't synthesize bpf events.\n"); |
|
|
|
if (rec->opts.synth & PERF_SYNTH_CGROUP) { |
|
err = perf_event__synthesize_cgroups(tool, process_synthesized_event, |
|
machine); |
|
if (err < 0) |
|
pr_warning("Couldn't synthesize cgroup events.\n"); |
|
} |
|
|
|
if (rec->opts.nr_threads_synthesize > 1) { |
|
perf_set_multithreaded(); |
|
f = process_locked_synthesized_event; |
|
} |
|
|
|
if (rec->opts.synth & PERF_SYNTH_TASK) { |
|
bool needs_mmap = rec->opts.synth & PERF_SYNTH_MMAP; |
|
|
|
err = __machine__synthesize_threads(machine, tool, &opts->target, |
|
rec->evlist->core.threads, |
|
f, needs_mmap, opts->sample_address, |
|
rec->opts.nr_threads_synthesize); |
|
} |
|
|
|
if (rec->opts.nr_threads_synthesize > 1) |
|
perf_set_singlethreaded(); |
|
|
|
out: |
|
return err; |
|
} |
|
|
|
static int record__process_signal_event(union perf_event *event __maybe_unused, void *data) |
|
{ |
|
struct record *rec = data; |
|
pthread_kill(rec->thread_id, SIGUSR2); |
|
return 0; |
|
} |
|
|
|
static int record__setup_sb_evlist(struct record *rec) |
|
{ |
|
struct record_opts *opts = &rec->opts; |
|
|
|
if (rec->sb_evlist != NULL) { |
|
/* |
|
* We get here if --switch-output-event populated the |
|
* sb_evlist, so associate a callback that will send a SIGUSR2 |
|
* to the main thread. |
|
*/ |
|
evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec); |
|
rec->thread_id = pthread_self(); |
|
} |
|
#ifdef HAVE_LIBBPF_SUPPORT |
|
if (!opts->no_bpf_event) { |
|
if (rec->sb_evlist == NULL) { |
|
rec->sb_evlist = evlist__new(); |
|
|
|
if (rec->sb_evlist == NULL) { |
|
pr_err("Couldn't create side band evlist.\n."); |
|
return -1; |
|
} |
|
} |
|
|
|
if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) { |
|
pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n."); |
|
return -1; |
|
} |
|
} |
|
#endif |
|
if (evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) { |
|
pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n"); |
|
opts->no_bpf_event = true; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int record__init_clock(struct record *rec) |
|
{ |
|
struct perf_session *session = rec->session; |
|
struct timespec ref_clockid; |
|
struct timeval ref_tod; |
|
u64 ref; |
|
|
|
if (!rec->opts.use_clockid) |
|
return 0; |
|
|
|
if (rec->opts.use_clockid && rec->opts.clockid_res_ns) |
|
session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns; |
|
|
|
session->header.env.clock.clockid = rec->opts.clockid; |
|
|
|
if (gettimeofday(&ref_tod, NULL) != 0) { |
|
pr_err("gettimeofday failed, cannot set reference time.\n"); |
|
return -1; |
|
} |
|
|
|
if (clock_gettime(rec->opts.clockid, &ref_clockid)) { |
|
pr_err("clock_gettime failed, cannot set reference time.\n"); |
|
return -1; |
|
} |
|
|
|
ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC + |
|
(u64) ref_tod.tv_usec * NSEC_PER_USEC; |
|
|
|
session->header.env.clock.tod_ns = ref; |
|
|
|
ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC + |
|
(u64) ref_clockid.tv_nsec; |
|
|
|
session->header.env.clock.clockid_ns = ref; |
|
return 0; |
|
} |
|
|
|
static void hit_auxtrace_snapshot_trigger(struct record *rec) |
|
{ |
|
if (trigger_is_ready(&auxtrace_snapshot_trigger)) { |
|
trigger_hit(&auxtrace_snapshot_trigger); |
|
auxtrace_record__snapshot_started = 1; |
|
if (auxtrace_record__snapshot_start(rec->itr)) |
|
trigger_error(&auxtrace_snapshot_trigger); |
|
} |
|
} |
|
|
|
static void record__uniquify_name(struct record *rec) |
|
{ |
|
struct evsel *pos; |
|
struct evlist *evlist = rec->evlist; |
|
char *new_name; |
|
int ret; |
|
|
|
if (!perf_pmu__has_hybrid()) |
|
return; |
|
|
|
evlist__for_each_entry(evlist, pos) { |
|
if (!evsel__is_hybrid(pos)) |
|
continue; |
|
|
|
if (strchr(pos->name, '/')) |
|
continue; |
|
|
|
ret = asprintf(&new_name, "%s/%s/", |
|
pos->pmu_name, pos->name); |
|
if (ret) { |
|
free(pos->name); |
|
pos->name = new_name; |
|
} |
|
} |
|
} |
|
|
|
static int __cmd_record(struct record *rec, int argc, const char **argv) |
|
{ |
|
int err; |
|
int status = 0; |
|
unsigned long waking = 0; |
|
const bool forks = argc > 0; |
|
struct perf_tool *tool = &rec->tool; |
|
struct record_opts *opts = &rec->opts; |
|
struct perf_data *data = &rec->data; |
|
struct perf_session *session; |
|
bool disabled = false, draining = false; |
|
int fd; |
|
float ratio = 0; |
|
enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED; |
|
|
|
atexit(record__sig_exit); |
|
signal(SIGCHLD, sig_handler); |
|
signal(SIGINT, sig_handler); |
|
signal(SIGTERM, sig_handler); |
|
signal(SIGSEGV, sigsegv_handler); |
|
|
|
if (rec->opts.record_namespaces) |
|
tool->namespace_events = true; |
|
|
|
if (rec->opts.record_cgroup) { |
|
#ifdef HAVE_FILE_HANDLE |
|
tool->cgroup_events = true; |
|
#else |
|
pr_err("cgroup tracking is not supported\n"); |
|
return -1; |
|
#endif |
|
} |
|
|
|
if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) { |
|
signal(SIGUSR2, snapshot_sig_handler); |
|
if (rec->opts.auxtrace_snapshot_mode) |
|
trigger_on(&auxtrace_snapshot_trigger); |
|
if (rec->switch_output.enabled) |
|
trigger_on(&switch_output_trigger); |
|
} else { |
|
signal(SIGUSR2, SIG_IGN); |
|
} |
|
|
|
session = perf_session__new(data, tool); |
|
if (IS_ERR(session)) { |
|
pr_err("Perf session creation failed.\n"); |
|
return PTR_ERR(session); |
|
} |
|
|
|
fd = perf_data__fd(data); |
|
rec->session = session; |
|
|
|
if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) { |
|
pr_err("Compression initialization failed.\n"); |
|
return -1; |
|
} |
|
#ifdef HAVE_EVENTFD_SUPPORT |
|
done_fd = eventfd(0, EFD_NONBLOCK); |
|
if (done_fd < 0) { |
|
pr_err("Failed to create wakeup eventfd, error: %m\n"); |
|
status = -1; |
|
goto out_delete_session; |
|
} |
|
err = evlist__add_wakeup_eventfd(rec->evlist, done_fd); |
|
if (err < 0) { |
|
pr_err("Failed to add wakeup eventfd to poll list\n"); |
|
status = err; |
|
goto out_delete_session; |
|
} |
|
#endif // HAVE_EVENTFD_SUPPORT |
|
|
|
session->header.env.comp_type = PERF_COMP_ZSTD; |
|
session->header.env.comp_level = rec->opts.comp_level; |
|
|
|
if (rec->opts.kcore && |
|
!record__kcore_readable(&session->machines.host)) { |
|
pr_err("ERROR: kcore is not readable.\n"); |
|
return -1; |
|
} |
|
|
|
if (record__init_clock(rec)) |
|
return -1; |
|
|
|
record__init_features(rec); |
|
|
|
if (forks) { |
|
err = evlist__prepare_workload(rec->evlist, &opts->target, argv, data->is_pipe, |
|
workload_exec_failed_signal); |
|
if (err < 0) { |
|
pr_err("Couldn't run the workload!\n"); |
|
status = err; |
|
goto out_delete_session; |
|
} |
|
} |
|
|
|
/* |
|
* If we have just single event and are sending data |
|
* through pipe, we need to force the ids allocation, |
|
* because we synthesize event name through the pipe |
|
* and need the id for that. |
|
*/ |
|
if (data->is_pipe && rec->evlist->core.nr_entries == 1) |
|
rec->opts.sample_id = true; |
|
|
|
record__uniquify_name(rec); |
|
|
|
if (record__open(rec) != 0) { |
|
err = -1; |
|
goto out_child; |
|
} |
|
session->header.env.comp_mmap_len = session->evlist->core.mmap_len; |
|
|
|
if (rec->opts.kcore) { |
|
err = record__kcore_copy(&session->machines.host, data); |
|
if (err) { |
|
pr_err("ERROR: Failed to copy kcore\n"); |
|
goto out_child; |
|
} |
|
} |
|
|
|
err = bpf__apply_obj_config(); |
|
if (err) { |
|
char errbuf[BUFSIZ]; |
|
|
|
bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf)); |
|
pr_err("ERROR: Apply config to BPF failed: %s\n", |
|
errbuf); |
|
goto out_child; |
|
} |
|
|
|
/* |
|
* Normally perf_session__new would do this, but it doesn't have the |
|
* evlist. |
|
*/ |
|
if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) { |
|
pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n"); |
|
rec->tool.ordered_events = false; |
|
} |
|
|
|
if (!rec->evlist->core.nr_groups) |
|
perf_header__clear_feat(&session->header, HEADER_GROUP_DESC); |
|
|
|
if (data->is_pipe) { |
|
err = perf_header__write_pipe(fd); |
|
if (err < 0) |
|
goto out_child; |
|
} else { |
|
err = perf_session__write_header(session, rec->evlist, fd, false); |
|
if (err < 0) |
|
goto out_child; |
|
} |
|
|
|
err = -1; |
|
if (!rec->no_buildid |
|
&& !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) { |
|
pr_err("Couldn't generate buildids. " |
|
"Use --no-buildid to profile anyway.\n"); |
|
goto out_child; |
|
} |
|
|
|
err = record__setup_sb_evlist(rec); |
|
if (err) |
|
goto out_child; |
|
|
|
err = record__synthesize(rec, false); |
|
if (err < 0) |
|
goto out_child; |
|
|
|
if (rec->realtime_prio) { |
|
struct sched_param param; |
|
|
|
param.sched_priority = rec->realtime_prio; |
|
if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { |
|
pr_err("Could not set realtime priority.\n"); |
|
err = -1; |
|
goto out_child; |
|
} |
|
} |
|
|
|
/* |
|
* When perf is starting the traced process, all the events |
|
* (apart from group members) have enable_on_exec=1 set, |
|
* so don't spoil it by prematurely enabling them. |
|
*/ |
|
if (!target__none(&opts->target) && !opts->initial_delay) |
|
evlist__enable(rec->evlist); |
|
|
|
/* |
|
* Let the child rip |
|
*/ |
|
if (forks) { |
|
struct machine *machine = &session->machines.host; |
|
union perf_event *event; |
|
pid_t tgid; |
|
|
|
event = malloc(sizeof(event->comm) + machine->id_hdr_size); |
|
if (event == NULL) { |
|
err = -ENOMEM; |
|
goto out_child; |
|
} |
|
|
|
/* |
|
* Some H/W events are generated before COMM event |
|
* which is emitted during exec(), so perf script |
|
* cannot see a correct process name for those events. |
|
* Synthesize COMM event to prevent it. |
|
*/ |
|
tgid = perf_event__synthesize_comm(tool, event, |
|
rec->evlist->workload.pid, |
|
process_synthesized_event, |
|
machine); |
|
free(event); |
|
|
|
if (tgid == -1) |
|
goto out_child; |
|
|
|
event = malloc(sizeof(event->namespaces) + |
|
(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + |
|
machine->id_hdr_size); |
|
if (event == NULL) { |
|
err = -ENOMEM; |
|
goto out_child; |
|
} |
|
|
|
/* |
|
* Synthesize NAMESPACES event for the command specified. |
|
*/ |
|
perf_event__synthesize_namespaces(tool, event, |
|
rec->evlist->workload.pid, |
|
tgid, process_synthesized_event, |
|
machine); |
|
free(event); |
|
|
|
evlist__start_workload(rec->evlist); |
|
} |
|
|
|
if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack)) |
|
goto out_child; |
|
|
|
if (opts->initial_delay) { |
|
pr_info(EVLIST_DISABLED_MSG); |
|
if (opts->initial_delay > 0) { |
|
usleep(opts->initial_delay * USEC_PER_MSEC); |
|
evlist__enable(rec->evlist); |
|
pr_info(EVLIST_ENABLED_MSG); |
|
} |
|
} |
|
|
|
trigger_ready(&auxtrace_snapshot_trigger); |
|
trigger_ready(&switch_output_trigger); |
|
perf_hooks__invoke_record_start(); |
|
for (;;) { |
|
unsigned long long hits = rec->samples; |
|
|
|
/* |
|
* rec->evlist->bkw_mmap_state is possible to be |
|
* BKW_MMAP_EMPTY here: when done == true and |
|
* hits != rec->samples in previous round. |
|
* |
|
* evlist__toggle_bkw_mmap ensure we never |
|
* convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING. |
|
*/ |
|
if (trigger_is_hit(&switch_output_trigger) || done || draining) |
|
evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING); |
|
|
|
if (record__mmap_read_all(rec, false) < 0) { |
|
trigger_error(&auxtrace_snapshot_trigger); |
|
trigger_error(&switch_output_trigger); |
|
err = -1; |
|
goto out_child; |
|
} |
|
|
|
if (auxtrace_record__snapshot_started) { |
|
auxtrace_record__snapshot_started = 0; |
|
if (!trigger_is_error(&auxtrace_snapshot_trigger)) |
|
record__read_auxtrace_snapshot(rec, false); |
|
if (trigger_is_error(&auxtrace_snapshot_trigger)) { |
|
pr_err("AUX area tracing snapshot failed\n"); |
|
err = -1; |
|
goto out_child; |
|
} |
|
} |
|
|
|
if (trigger_is_hit(&switch_output_trigger)) { |
|
/* |
|
* If switch_output_trigger is hit, the data in |
|
* overwritable ring buffer should have been collected, |
|
* so bkw_mmap_state should be set to BKW_MMAP_EMPTY. |
|
* |
|
* If SIGUSR2 raise after or during record__mmap_read_all(), |
|
* record__mmap_read_all() didn't collect data from |
|
* overwritable ring buffer. Read again. |
|
*/ |
|
if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING) |
|
continue; |
|
trigger_ready(&switch_output_trigger); |
|
|
|
/* |
|
* Reenable events in overwrite ring buffer after |
|
* record__mmap_read_all(): we should have collected |
|
* data from it. |
|
*/ |
|
evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING); |
|
|
|
if (!quiet) |
|
fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n", |
|
waking); |
|
waking = 0; |
|
fd = record__switch_output(rec, false); |
|
if (fd < 0) { |
|
pr_err("Failed to switch to new file\n"); |
|
trigger_error(&switch_output_trigger); |
|
err = fd; |
|
goto out_child; |
|
} |
|
|
|
/* re-arm the alarm */ |
|
if (rec->switch_output.time) |
|
alarm(rec->switch_output.time); |
|
} |
|
|
|
if (hits == rec->samples) { |
|
if (done || draining) |
|
break; |
|
err = evlist__poll(rec->evlist, -1); |
|
/* |
|
* Propagate error, only if there's any. Ignore positive |
|
* number of returned events and interrupt error. |
|
*/ |
|
if (err > 0 || (err < 0 && errno == EINTR)) |
|
err = 0; |
|
waking++; |
|
|
|
if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0) |
|
draining = true; |
|
} |
|
|
|
if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) { |
|
switch (cmd) { |
|
case EVLIST_CTL_CMD_SNAPSHOT: |
|
hit_auxtrace_snapshot_trigger(rec); |
|
evlist__ctlfd_ack(rec->evlist); |
|
break; |
|
case EVLIST_CTL_CMD_STOP: |
|
done = 1; |
|
break; |
|
case EVLIST_CTL_CMD_ACK: |
|
case EVLIST_CTL_CMD_UNSUPPORTED: |
|
case EVLIST_CTL_CMD_ENABLE: |
|
case EVLIST_CTL_CMD_DISABLE: |
|
case EVLIST_CTL_CMD_EVLIST: |
|
case EVLIST_CTL_CMD_PING: |
|
default: |
|
break; |
|
} |
|
} |
|
|
|
/* |
|
* When perf is starting the traced process, at the end events |
|
* die with the process and we wait for that. Thus no need to |
|
* disable events in this case. |
|
*/ |
|
if (done && !disabled && !target__none(&opts->target)) { |
|
trigger_off(&auxtrace_snapshot_trigger); |
|
evlist__disable(rec->evlist); |
|
disabled = true; |
|
} |
|
} |
|
|
|
trigger_off(&auxtrace_snapshot_trigger); |
|
trigger_off(&switch_output_trigger); |
|
|
|
if (opts->auxtrace_snapshot_on_exit) |
|
record__auxtrace_snapshot_exit(rec); |
|
|
|
if (forks && workload_exec_errno) { |
|
char msg[STRERR_BUFSIZE], strevsels[2048]; |
|
const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg)); |
|
|
|
evlist__scnprintf_evsels(rec->evlist, sizeof(strevsels), strevsels); |
|
|
|
pr_err("Failed to collect '%s' for the '%s' workload: %s\n", |
|
strevsels, argv[0], emsg); |
|
err = -1; |
|
goto out_child; |
|
} |
|
|
|
if (!quiet) |
|
fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
|
|
|
if (target__none(&rec->opts.target)) |
|
record__synthesize_workload(rec, true); |
|
|
|
out_child: |
|
evlist__finalize_ctlfd(rec->evlist); |
|
record__mmap_read_all(rec, true); |
|
record__aio_mmap_read_sync(rec); |
|
|
|
if (rec->session->bytes_transferred && rec->session->bytes_compressed) { |
|
ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed; |
|
session->header.env.comp_ratio = ratio + 0.5; |
|
} |
|
|
|
if (forks) { |
|
int exit_status; |
|
|
|
if (!child_finished) |
|
kill(rec->evlist->workload.pid, SIGTERM); |
|
|
|
wait(&exit_status); |
|
|
|
if (err < 0) |
|
status = err; |
|
else if (WIFEXITED(exit_status)) |
|
status = WEXITSTATUS(exit_status); |
|
else if (WIFSIGNALED(exit_status)) |
|
signr = WTERMSIG(exit_status); |
|
} else |
|
status = err; |
|
|
|
record__synthesize(rec, true); |
|
/* this will be recalculated during process_buildids() */ |
|
rec->samples = 0; |
|
|
|
if (!err) { |
|
if (!rec->timestamp_filename) { |
|
record__finish_output(rec); |
|
} else { |
|
fd = record__switch_output(rec, true); |
|
if (fd < 0) { |
|
status = fd; |
|
goto out_delete_session; |
|
} |
|
} |
|
} |
|
|
|
perf_hooks__invoke_record_end(); |
|
|
|
if (!err && !quiet) { |
|
char samples[128]; |
|
const char *postfix = rec->timestamp_filename ? |
|
".<timestamp>" : ""; |
|
|
|
if (rec->samples && !rec->opts.full_auxtrace) |
|
scnprintf(samples, sizeof(samples), |
|
" (%" PRIu64 " samples)", rec->samples); |
|
else |
|
samples[0] = '\0'; |
|
|
|
fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s", |
|
perf_data__size(data) / 1024.0 / 1024.0, |
|
data->path, postfix, samples); |
|
if (ratio) { |
|
fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)", |
|
rec->session->bytes_transferred / 1024.0 / 1024.0, |
|
ratio); |
|
} |
|
fprintf(stderr, " ]\n"); |
|
} |
|
|
|
out_delete_session: |
|
#ifdef HAVE_EVENTFD_SUPPORT |
|
if (done_fd >= 0) |
|
close(done_fd); |
|
#endif |
|
zstd_fini(&session->zstd_data); |
|
perf_session__delete(session); |
|
|
|
if (!opts->no_bpf_event) |
|
evlist__stop_sb_thread(rec->sb_evlist); |
|
return status; |
|
} |
|
|
|
static void callchain_debug(struct callchain_param *callchain) |
|
{ |
|
static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" }; |
|
|
|
pr_debug("callchain: type %s\n", str[callchain->record_mode]); |
|
|
|
if (callchain->record_mode == CALLCHAIN_DWARF) |
|
pr_debug("callchain: stack dump size %d\n", |
|
callchain->dump_size); |
|
} |
|
|
|
int record_opts__parse_callchain(struct record_opts *record, |
|
struct callchain_param *callchain, |
|
const char *arg, bool unset) |
|
{ |
|
int ret; |
|
callchain->enabled = !unset; |
|
|
|
/* --no-call-graph */ |
|
if (unset) { |
|
callchain->record_mode = CALLCHAIN_NONE; |
|
pr_debug("callchain: disabled\n"); |
|
return 0; |
|
} |
|
|
|
ret = parse_callchain_record_opt(arg, callchain); |
|
if (!ret) { |
|
/* Enable data address sampling for DWARF unwind. */ |
|
if (callchain->record_mode == CALLCHAIN_DWARF) |
|
record->sample_address = true; |
|
callchain_debug(callchain); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int record_parse_callchain_opt(const struct option *opt, |
|
const char *arg, |
|
int unset) |
|
{ |
|
return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset); |
|
} |
|
|
|
int record_callchain_opt(const struct option *opt, |
|
const char *arg __maybe_unused, |
|
int unset __maybe_unused) |
|
{ |
|
struct callchain_param *callchain = opt->value; |
|
|
|
callchain->enabled = true; |
|
|
|
if (callchain->record_mode == CALLCHAIN_NONE) |
|
callchain->record_mode = CALLCHAIN_FP; |
|
|
|
callchain_debug(callchain); |
|
return 0; |
|
} |
|
|
|
static int perf_record_config(const char *var, const char *value, void *cb) |
|
{ |
|
struct record *rec = cb; |
|
|
|
if (!strcmp(var, "record.build-id")) { |
|
if (!strcmp(value, "cache")) |
|
rec->no_buildid_cache = false; |
|
else if (!strcmp(value, "no-cache")) |
|
rec->no_buildid_cache = true; |
|
else if (!strcmp(value, "skip")) |
|
rec->no_buildid = true; |
|
else if (!strcmp(value, "mmap")) |
|
rec->buildid_mmap = true; |
|
else |
|
return -1; |
|
return 0; |
|
} |
|
if (!strcmp(var, "record.call-graph")) { |
|
var = "call-graph.record-mode"; |
|
return perf_default_config(var, value, cb); |
|
} |
|
#ifdef HAVE_AIO_SUPPORT |
|
if (!strcmp(var, "record.aio")) { |
|
rec->opts.nr_cblocks = strtol(value, NULL, 0); |
|
if (!rec->opts.nr_cblocks) |
|
rec->opts.nr_cblocks = nr_cblocks_default; |
|
} |
|
#endif |
|
if (!strcmp(var, "record.debuginfod")) { |
|
rec->debuginfod.urls = strdup(value); |
|
if (!rec->debuginfod.urls) |
|
return -ENOMEM; |
|
rec->debuginfod.set = true; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
|
|
static int record__parse_affinity(const struct option *opt, const char *str, int unset) |
|
{ |
|
struct record_opts *opts = (struct record_opts *)opt->value; |
|
|
|
if (unset || !str) |
|
return 0; |
|
|
|
if (!strcasecmp(str, "node")) |
|
opts->affinity = PERF_AFFINITY_NODE; |
|
else if (!strcasecmp(str, "cpu")) |
|
opts->affinity = PERF_AFFINITY_CPU; |
|
|
|
return 0; |
|
} |
|
|
|
static int parse_output_max_size(const struct option *opt, |
|
const char *str, int unset) |
|
{ |
|
unsigned long *s = (unsigned long *)opt->value; |
|
static struct parse_tag tags_size[] = { |
|
{ .tag = 'B', .mult = 1 }, |
|
{ .tag = 'K', .mult = 1 << 10 }, |
|
{ .tag = 'M', .mult = 1 << 20 }, |
|
{ .tag = 'G', .mult = 1 << 30 }, |
|
{ .tag = 0 }, |
|
}; |
|
unsigned long val; |
|
|
|
if (unset) { |
|
*s = 0; |
|
return 0; |
|
} |
|
|
|
val = parse_tag_value(str, tags_size); |
|
if (val != (unsigned long) -1) { |
|
*s = val; |
|
return 0; |
|
} |
|
|
|
return -1; |
|
} |
|
|
|
static int record__parse_mmap_pages(const struct option *opt, |
|
const char *str, |
|
int unset __maybe_unused) |
|
{ |
|
struct record_opts *opts = opt->value; |
|
char *s, *p; |
|
unsigned int mmap_pages; |
|
int ret; |
|
|
|
if (!str) |
|
return -EINVAL; |
|
|
|
s = strdup(str); |
|
if (!s) |
|
return -ENOMEM; |
|
|
|
p = strchr(s, ','); |
|
if (p) |
|
*p = '\0'; |
|
|
|
if (*s) { |
|
ret = __evlist__parse_mmap_pages(&mmap_pages, s); |
|
if (ret) |
|
goto out_free; |
|
opts->mmap_pages = mmap_pages; |
|
} |
|
|
|
if (!p) { |
|
ret = 0; |
|
goto out_free; |
|
} |
|
|
|
ret = __evlist__parse_mmap_pages(&mmap_pages, p + 1); |
|
if (ret) |
|
goto out_free; |
|
|
|
opts->auxtrace_mmap_pages = mmap_pages; |
|
|
|
out_free: |
|
free(s); |
|
return ret; |
|
} |
|
|
|
void __weak arch__add_leaf_frame_record_opts(struct record_opts *opts __maybe_unused) |
|
{ |
|
} |
|
|
|
static int parse_control_option(const struct option *opt, |
|
const char *str, |
|
int unset __maybe_unused) |
|
{ |
|
struct record_opts *opts = opt->value; |
|
|
|
return evlist__parse_control(str, &opts->ctl_fd, &opts->ctl_fd_ack, &opts->ctl_fd_close); |
|
} |
|
|
|
static void switch_output_size_warn(struct record *rec) |
|
{ |
|
u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages); |
|
struct switch_output *s = &rec->switch_output; |
|
|
|
wakeup_size /= 2; |
|
|
|
if (s->size < wakeup_size) { |
|
char buf[100]; |
|
|
|
unit_number__scnprintf(buf, sizeof(buf), wakeup_size); |
|
pr_warning("WARNING: switch-output data size lower than " |
|
"wakeup kernel buffer size (%s) " |
|
"expect bigger perf.data sizes\n", buf); |
|
} |
|
} |
|
|
|
static int switch_output_setup(struct record *rec) |
|
{ |
|
struct switch_output *s = &rec->switch_output; |
|
static struct parse_tag tags_size[] = { |
|
{ .tag = 'B', .mult = 1 }, |
|
{ .tag = 'K', .mult = 1 << 10 }, |
|
{ .tag = 'M', .mult = 1 << 20 }, |
|
{ .tag = 'G', .mult = 1 << 30 }, |
|
{ .tag = 0 }, |
|
}; |
|
static struct parse_tag tags_time[] = { |
|
{ .tag = 's', .mult = 1 }, |
|
{ .tag = 'm', .mult = 60 }, |
|
{ .tag = 'h', .mult = 60*60 }, |
|
{ .tag = 'd', .mult = 60*60*24 }, |
|
{ .tag = 0 }, |
|
}; |
|
unsigned long val; |
|
|
|
/* |
|
* If we're using --switch-output-events, then we imply its |
|
* --switch-output=signal, as we'll send a SIGUSR2 from the side band |
|
* thread to its parent. |
|
*/ |
|
if (rec->switch_output_event_set) |
|
goto do_signal; |
|
|
|
if (!s->set) |
|
return 0; |
|
|
|
if (!strcmp(s->str, "signal")) { |
|
do_signal: |
|
s->signal = true; |
|
pr_debug("switch-output with SIGUSR2 signal\n"); |
|
goto enabled; |
|
} |
|
|
|
val = parse_tag_value(s->str, tags_size); |
|
if (val != (unsigned long) -1) { |
|
s->size = val; |
|
pr_debug("switch-output with %s size threshold\n", s->str); |
|
goto enabled; |
|
} |
|
|
|
val = parse_tag_value(s->str, tags_time); |
|
if (val != (unsigned long) -1) { |
|
s->time = val; |
|
pr_debug("switch-output with %s time threshold (%lu seconds)\n", |
|
s->str, s->time); |
|
goto enabled; |
|
} |
|
|
|
return -1; |
|
|
|
enabled: |
|
rec->timestamp_filename = true; |
|
s->enabled = true; |
|
|
|
if (s->size && !rec->opts.no_buffering) |
|
switch_output_size_warn(rec); |
|
|
|
return 0; |
|
} |
|
|
|
static const char * const __record_usage[] = { |
|
"perf record [<options>] [<command>]", |
|
"perf record [<options>] -- <command> [<options>]", |
|
NULL |
|
}; |
|
const char * const *record_usage = __record_usage; |
|
|
|
static int build_id__process_mmap(struct perf_tool *tool, union perf_event *event, |
|
struct perf_sample *sample, struct machine *machine) |
|
{ |
|
/* |
|
* We already have the kernel maps, put in place via perf_session__create_kernel_maps() |
|
* no need to add them twice. |
|
*/ |
|
if (!(event->header.misc & PERF_RECORD_MISC_USER)) |
|
return 0; |
|
return perf_event__process_mmap(tool, event, sample, machine); |
|
} |
|
|
|
static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event, |
|
struct perf_sample *sample, struct machine *machine) |
|
{ |
|
/* |
|
* We already have the kernel maps, put in place via perf_session__create_kernel_maps() |
|
* no need to add them twice. |
|
*/ |
|
if (!(event->header.misc & PERF_RECORD_MISC_USER)) |
|
return 0; |
|
|
|
return perf_event__process_mmap2(tool, event, sample, machine); |
|
} |
|
|
|
static int process_timestamp_boundary(struct perf_tool *tool, |
|
union perf_event *event __maybe_unused, |
|
struct perf_sample *sample, |
|
struct machine *machine __maybe_unused) |
|
{ |
|
struct record *rec = container_of(tool, struct record, tool); |
|
|
|
set_timestamp_boundary(rec, sample->time); |
|
return 0; |
|
} |
|
|
|
static int parse_record_synth_option(const struct option *opt, |
|
const char *str, |
|
int unset __maybe_unused) |
|
{ |
|
struct record_opts *opts = opt->value; |
|
char *p = strdup(str); |
|
|
|
if (p == NULL) |
|
return -1; |
|
|
|
opts->synth = parse_synth_opt(p); |
|
free(p); |
|
|
|
if (opts->synth < 0) { |
|
pr_err("Invalid synth option: %s\n", str); |
|
return -1; |
|
} |
|
return 0; |
|
} |
|
|
|
/* |
|
* XXX Ideally would be local to cmd_record() and passed to a record__new |
|
* because we need to have access to it in record__exit, that is called |
|
* after cmd_record() exits, but since record_options need to be accessible to |
|
* builtin-script, leave it here. |
|
* |
|
* At least we don't ouch it in all the other functions here directly. |
|
* |
|
* Just say no to tons of global variables, sigh. |
|
*/ |
|
static struct record record = { |
|
.opts = { |
|
.sample_time = true, |
|
.mmap_pages = UINT_MAX, |
|
.user_freq = UINT_MAX, |
|
.user_interval = ULLONG_MAX, |
|
.freq = 4000, |
|
.target = { |
|
.uses_mmap = true, |
|
.default_per_cpu = true, |
|
}, |
|
.mmap_flush = MMAP_FLUSH_DEFAULT, |
|
.nr_threads_synthesize = 1, |
|
.ctl_fd = -1, |
|
.ctl_fd_ack = -1, |
|
.synth = PERF_SYNTH_ALL, |
|
}, |
|
.tool = { |
|
.sample = process_sample_event, |
|
.fork = perf_event__process_fork, |
|
.exit = perf_event__process_exit, |
|
.comm = perf_event__process_comm, |
|
.namespaces = perf_event__process_namespaces, |
|
.mmap = build_id__process_mmap, |
|
.mmap2 = build_id__process_mmap2, |
|
.itrace_start = process_timestamp_boundary, |
|
.aux = process_timestamp_boundary, |
|
.ordered_events = true, |
|
}, |
|
}; |
|
|
|
const char record_callchain_help[] = CALLCHAIN_RECORD_HELP |
|
"\n\t\t\t\tDefault: fp"; |
|
|
|
static bool dry_run; |
|
|
|
/* |
|
* XXX Will stay a global variable till we fix builtin-script.c to stop messing |
|
* with it and switch to use the library functions in perf_evlist that came |
|
* from builtin-record.c, i.e. use record_opts, |
|
* evlist__prepare_workload, etc instead of fork+exec'in 'perf record', |
|
* using pipes, etc. |
|
*/ |
|
static struct option __record_options[] = { |
|
OPT_CALLBACK('e', "event", &record.evlist, "event", |
|
"event selector. use 'perf list' to list available events", |
|
parse_events_option), |
|
OPT_CALLBACK(0, "filter", &record.evlist, "filter", |
|
"event filter", parse_filter), |
|
OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist, |
|
NULL, "don't record events from perf itself", |
|
exclude_perf), |
|
OPT_STRING('p', "pid", &record.opts.target.pid, "pid", |
|
"record events on existing process id"), |
|
OPT_STRING('t', "tid", &record.opts.target.tid, "tid", |
|
"record events on existing thread id"), |
|
OPT_INTEGER('r', "realtime", &record.realtime_prio, |
|
"collect data with this RT SCHED_FIFO priority"), |
|
OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering, |
|
"collect data without buffering"), |
|
OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples, |
|
"collect raw sample records from all opened counters"), |
|
OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide, |
|
"system-wide collection from all CPUs"), |
|
OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu", |
|
"list of cpus to monitor"), |
|
OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"), |
|
OPT_STRING('o', "output", &record.data.path, "file", |
|
"output file name"), |
|
OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit, |
|
&record.opts.no_inherit_set, |
|
"child tasks do not inherit counters"), |
|
OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize, |
|
"synthesize non-sample events at the end of output"), |
|
OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"), |
|
OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"), |
|
OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq, |
|
"Fail if the specified frequency can't be used"), |
|
OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'", |
|
"profile at this frequency", |
|
record__parse_freq), |
|
OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]", |
|
"number of mmap data pages and AUX area tracing mmap pages", |
|
record__parse_mmap_pages), |
|
OPT_CALLBACK(0, "mmap-flush", &record.opts, "number", |
|
"Minimal number of bytes that is extracted from mmap data pages (default: 1)", |
|
record__mmap_flush_parse), |
|
OPT_BOOLEAN(0, "group", &record.opts.group, |
|
"put the counters into a counter group"), |
|
OPT_CALLBACK_NOOPT('g', NULL, &callchain_param, |
|
NULL, "enables call-graph recording" , |
|
&record_callchain_opt), |
|
OPT_CALLBACK(0, "call-graph", &record.opts, |
|
"record_mode[,record_size]", record_callchain_help, |
|
&record_parse_callchain_opt), |
|
OPT_INCR('v', "verbose", &verbose, |
|
"be more verbose (show counter open errors, etc)"), |
|
OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"), |
|
OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat, |
|
"per thread counts"), |
|
OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"), |
|
OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr, |
|
"Record the sample physical addresses"), |
|
OPT_BOOLEAN(0, "data-page-size", &record.opts.sample_data_page_size, |
|
"Record the sampled data address data page size"), |
|
OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size, |
|
"Record the sampled code address (ip) page size"), |
|
OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"), |
|
OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time, |
|
&record.opts.sample_time_set, |
|
"Record the sample timestamps"), |
|
OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set, |
|
"Record the sample period"), |
|
OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples, |
|
"don't sample"), |
|
OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache, |
|
&record.no_buildid_cache_set, |
|
"do not update the buildid cache"), |
|
OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid, |
|
&record.no_buildid_set, |
|
"do not collect buildids in perf.data"), |
|
OPT_CALLBACK('G', "cgroup", &record.evlist, "name", |
|
"monitor event in cgroup name only", |
|
parse_cgroups), |
|
OPT_INTEGER('D', "delay", &record.opts.initial_delay, |
|
"ms to wait before starting measurement after program start (-1: start with events disabled)"), |
|
OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"), |
|
OPT_STRING('u', "uid", &record.opts.target.uid_str, "user", |
|
"user to profile"), |
|
|
|
OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack, |
|
"branch any", "sample any taken branches", |
|
parse_branch_stack), |
|
|
|
OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack, |
|
"branch filter mask", "branch stack filter modes", |
|
parse_branch_stack), |
|
OPT_BOOLEAN('W', "weight", &record.opts.sample_weight, |
|
"sample by weight (on special events only)"), |
|
OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction, |
|
"sample transaction flags (special events only)"), |
|
OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread, |
|
"use per-thread mmaps"), |
|
OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register", |
|
"sample selected machine registers on interrupt," |
|
" use '-I?' to list register names", parse_intr_regs), |
|
OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register", |
|
"sample selected machine registers on interrupt," |
|
" use '--user-regs=?' to list register names", parse_user_regs), |
|
OPT_BOOLEAN(0, "running-time", &record.opts.running_time, |
|
"Record running/enabled time of read (:S) events"), |
|
OPT_CALLBACK('k', "clockid", &record.opts, |
|
"clockid", "clockid to use for events, see clock_gettime()", |
|
parse_clockid), |
|
OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts, |
|
"opts", "AUX area tracing Snapshot Mode", ""), |
|
OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts, |
|
"opts", "sample AUX area", ""), |
|
OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout, |
|
"per thread proc mmap processing timeout in ms"), |
|
OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces, |
|
"Record namespaces events"), |
|
OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup, |
|
"Record cgroup events"), |
|
OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events, |
|
&record.opts.record_switch_events_set, |
|
"Record context switch events"), |
|
OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel, |
|
"Configure all used events to run in kernel space.", |
|
PARSE_OPT_EXCLUSIVE), |
|
OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user, |
|
"Configure all used events to run in user space.", |
|
PARSE_OPT_EXCLUSIVE), |
|
OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains, |
|
"collect kernel callchains"), |
|
OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains, |
|
"collect user callchains"), |
|
OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path", |
|
"clang binary to use for compiling BPF scriptlets"), |
|
OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options", |
|
"options passed to clang when compiling BPF scriptlets"), |
|
OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name, |
|
"file", "vmlinux pathname"), |
|
OPT_BOOLEAN(0, "buildid-all", &record.buildid_all, |
|
"Record build-id of all DSOs regardless of hits"), |
|
OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap, |
|
"Record build-id in map events"), |
|
OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename, |
|
"append timestamp to output filename"), |
|
OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary, |
|
"Record timestamp boundary (time of first/last samples)"), |
|
OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str, |
|
&record.switch_output.set, "signal or size[BKMG] or time[smhd]", |
|
"Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold", |
|
"signal"), |
|
OPT_CALLBACK_SET(0, "switch-output-event", &record.sb_evlist, &record.switch_output_event_set, "switch output event", |
|
"switch output event selector. use 'perf list' to list available events", |
|
parse_events_option_new_evlist), |
|
OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files, |
|
"Limit number of switch output generated files"), |
|
OPT_BOOLEAN(0, "dry-run", &dry_run, |
|
"Parse options then exit"), |
|
#ifdef HAVE_AIO_SUPPORT |
|
OPT_CALLBACK_OPTARG(0, "aio", &record.opts, |
|
&nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)", |
|
record__aio_parse), |
|
#endif |
|
OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu", |
|
"Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer", |
|
record__parse_affinity), |
|
#ifdef HAVE_ZSTD_SUPPORT |
|
OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default, |
|
"n", "Compressed records using specified level (default: 1 - fastest compression, 22 - greatest compression)", |
|
record__parse_comp_level), |
|
#endif |
|
OPT_CALLBACK(0, "max-size", &record.output_max_size, |
|
"size", "Limit the maximum size of the output file", parse_output_max_size), |
|
OPT_UINTEGER(0, "num-thread-synthesize", |
|
&record.opts.nr_threads_synthesize, |
|
"number of threads to run for event synthesis"), |
|
#ifdef HAVE_LIBPFM |
|
OPT_CALLBACK(0, "pfm-events", &record.evlist, "event", |
|
"libpfm4 event selector. use 'perf list' to list available events", |
|
parse_libpfm_events_option), |
|
#endif |
|
OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]", |
|
"Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events,\n" |
|
"\t\t\t 'snapshot': AUX area tracing snapshot).\n" |
|
"\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n" |
|
"\t\t\t Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.", |
|
parse_control_option), |
|
OPT_CALLBACK(0, "synth", &record.opts, "no|all|task|mmap|cgroup", |
|
"Fine-tune event synthesis: default=all", parse_record_synth_option), |
|
OPT_STRING_OPTARG_SET(0, "debuginfod", &record.debuginfod.urls, |
|
&record.debuginfod.set, "debuginfod urls", |
|
"Enable debuginfod data retrieval from DEBUGINFOD_URLS or specified urls", |
|
"system"), |
|
OPT_END() |
|
}; |
|
|
|
struct option *record_options = __record_options; |
|
|
|
int cmd_record(int argc, const char **argv) |
|
{ |
|
int err; |
|
struct record *rec = &record; |
|
char errbuf[BUFSIZ]; |
|
|
|
setlocale(LC_ALL, ""); |
|
|
|
#ifndef HAVE_LIBBPF_SUPPORT |
|
# define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c) |
|
set_nobuild('\0', "clang-path", true); |
|
set_nobuild('\0', "clang-opt", true); |
|
# undef set_nobuild |
|
#endif |
|
|
|
#ifndef HAVE_BPF_PROLOGUE |
|
# if !defined (HAVE_DWARF_SUPPORT) |
|
# define REASON "NO_DWARF=1" |
|
# elif !defined (HAVE_LIBBPF_SUPPORT) |
|
# define REASON "NO_LIBBPF=1" |
|
# else |
|
# define REASON "this architecture doesn't support BPF prologue" |
|
# endif |
|
# define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c) |
|
set_nobuild('\0', "vmlinux", true); |
|
# undef set_nobuild |
|
# undef REASON |
|
#endif |
|
|
|
rec->opts.affinity = PERF_AFFINITY_SYS; |
|
|
|
rec->evlist = evlist__new(); |
|
if (rec->evlist == NULL) |
|
return -ENOMEM; |
|
|
|
err = perf_config(perf_record_config, rec); |
|
if (err) |
|
return err; |
|
|
|
argc = parse_options(argc, argv, record_options, record_usage, |
|
PARSE_OPT_STOP_AT_NON_OPTION); |
|
if (quiet) |
|
perf_quiet_option(); |
|
|
|
err = symbol__validate_sym_arguments(); |
|
if (err) |
|
return err; |
|
|
|
perf_debuginfod_setup(&record.debuginfod); |
|
|
|
/* Make system wide (-a) the default target. */ |
|
if (!argc && target__none(&rec->opts.target)) |
|
rec->opts.target.system_wide = true; |
|
|
|
if (nr_cgroups && !rec->opts.target.system_wide) { |
|
usage_with_options_msg(record_usage, record_options, |
|
"cgroup monitoring only available in system-wide mode"); |
|
|
|
} |
|
|
|
if (rec->buildid_mmap) { |
|
if (!perf_can_record_build_id()) { |
|
pr_err("Failed: no support to record build id in mmap events, update your kernel.\n"); |
|
err = -EINVAL; |
|
goto out_opts; |
|
} |
|
pr_debug("Enabling build id in mmap2 events.\n"); |
|
/* Enable mmap build id synthesizing. */ |
|
symbol_conf.buildid_mmap2 = true; |
|
/* Enable perf_event_attr::build_id bit. */ |
|
rec->opts.build_id = true; |
|
/* Disable build id cache. */ |
|
rec->no_buildid = true; |
|
} |
|
|
|
if (rec->opts.record_cgroup && !perf_can_record_cgroup()) { |
|
pr_err("Kernel has no cgroup sampling support.\n"); |
|
err = -EINVAL; |
|
goto out_opts; |
|
} |
|
|
|
if (rec->opts.kcore) |
|
rec->data.is_dir = true; |
|
|
|
if (rec->opts.comp_level != 0) { |
|
pr_debug("Compression enabled, disabling build id collection at the end of the session.\n"); |
|
rec->no_buildid = true; |
|
} |
|
|
|
if (rec->opts.record_switch_events && |
|
!perf_can_record_switch_events()) { |
|
ui__error("kernel does not support recording context switch events\n"); |
|
parse_options_usage(record_usage, record_options, "switch-events", 0); |
|
err = -EINVAL; |
|
goto out_opts; |
|
} |
|
|
|
if (switch_output_setup(rec)) { |
|
parse_options_usage(record_usage, record_options, "switch-output", 0); |
|
err = -EINVAL; |
|
goto out_opts; |
|
} |
|
|
|
if (rec->switch_output.time) { |
|
signal(SIGALRM, alarm_sig_handler); |
|
alarm(rec->switch_output.time); |
|
} |
|
|
|
if (rec->switch_output.num_files) { |
|
rec->switch_output.filenames = calloc(sizeof(char *), |
|
rec->switch_output.num_files); |
|
if (!rec->switch_output.filenames) { |
|
err = -EINVAL; |
|
goto out_opts; |
|
} |
|
} |
|
|
|
/* |
|
* Allow aliases to facilitate the lookup of symbols for address |
|
* filters. Refer to auxtrace_parse_filters(). |
|
*/ |
|
symbol_conf.allow_aliases = true; |
|
|
|
symbol__init(NULL); |
|
|
|
if (rec->opts.affinity != PERF_AFFINITY_SYS) { |
|
rec->affinity_mask.nbits = cpu__max_cpu().cpu; |
|
rec->affinity_mask.bits = bitmap_zalloc(rec->affinity_mask.nbits); |
|
if (!rec->affinity_mask.bits) { |
|
pr_err("Failed to allocate thread mask for %zd cpus\n", rec->affinity_mask.nbits); |
|
err = -ENOMEM; |
|
goto out_opts; |
|
} |
|
pr_debug2("thread mask[%zd]: empty\n", rec->affinity_mask.nbits); |
|
} |
|
|
|
err = record__auxtrace_init(rec); |
|
if (err) |
|
goto out; |
|
|
|
if (dry_run) |
|
goto out; |
|
|
|
err = bpf__setup_stdout(rec->evlist); |
|
if (err) { |
|
bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf)); |
|
pr_err("ERROR: Setup BPF stdout failed: %s\n", |
|
errbuf); |
|
goto out; |
|
} |
|
|
|
err = -ENOMEM; |
|
|
|
if (rec->no_buildid_cache || rec->no_buildid) { |
|
disable_buildid_cache(); |
|
} else if (rec->switch_output.enabled) { |
|
/* |
|
* In 'perf record --switch-output', disable buildid |
|
* generation by default to reduce data file switching |
|
* overhead. Still generate buildid if they are required |
|
* explicitly using |
|
* |
|
* perf record --switch-output --no-no-buildid \ |
|
* --no-no-buildid-cache |
|
* |
|
* Following code equals to: |
|
* |
|
* if ((rec->no_buildid || !rec->no_buildid_set) && |
|
* (rec->no_buildid_cache || !rec->no_buildid_cache_set)) |
|
* disable_buildid_cache(); |
|
*/ |
|
bool disable = true; |
|
|
|
if (rec->no_buildid_set && !rec->no_buildid) |
|
disable = false; |
|
if (rec->no_buildid_cache_set && !rec->no_buildid_cache) |
|
disable = false; |
|
if (disable) { |
|
rec->no_buildid = true; |
|
rec->no_buildid_cache = true; |
|
disable_buildid_cache(); |
|
} |
|
} |
|
|
|
if (record.opts.overwrite) |
|
record.opts.tail_synthesize = true; |
|
|
|
if (rec->evlist->core.nr_entries == 0) { |
|
if (perf_pmu__has_hybrid()) { |
|
err = evlist__add_default_hybrid(rec->evlist, |
|
!record.opts.no_samples); |
|
} else { |
|
err = __evlist__add_default(rec->evlist, |
|
!record.opts.no_samples); |
|
} |
|
|
|
if (err < 0) { |
|
pr_err("Not enough memory for event selector list\n"); |
|
goto out; |
|
} |
|
} |
|
|
|
if (rec->opts.target.tid && !rec->opts.no_inherit_set) |
|
rec->opts.no_inherit = true; |
|
|
|
err = target__validate(&rec->opts.target); |
|
if (err) { |
|
target__strerror(&rec->opts.target, err, errbuf, BUFSIZ); |
|
ui__warning("%s\n", errbuf); |
|
} |
|
|
|
err = target__parse_uid(&rec->opts.target); |
|
if (err) { |
|
int saved_errno = errno; |
|
|
|
target__strerror(&rec->opts.target, err, errbuf, BUFSIZ); |
|
ui__error("%s", errbuf); |
|
|
|
err = -saved_errno; |
|
goto out; |
|
} |
|
|
|
/* Enable ignoring missing threads when -u/-p option is defined. */ |
|
rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid; |
|
|
|
if (evlist__fix_hybrid_cpus(rec->evlist, rec->opts.target.cpu_list)) { |
|
pr_err("failed to use cpu list %s\n", |
|
rec->opts.target.cpu_list); |
|
goto out; |
|
} |
|
|
|
rec->opts.target.hybrid = perf_pmu__has_hybrid(); |
|
|
|
if (callchain_param.enabled && callchain_param.record_mode == CALLCHAIN_FP) |
|
arch__add_leaf_frame_record_opts(&rec->opts); |
|
|
|
err = -ENOMEM; |
|
if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0) |
|
usage_with_options(record_usage, record_options); |
|
|
|
err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts); |
|
if (err) |
|
goto out; |
|
|
|
/* |
|
* We take all buildids when the file contains |
|
* AUX area tracing data because we do not decode the |
|
* trace because it would take too long. |
|
*/ |
|
if (rec->opts.full_auxtrace) |
|
rec->buildid_all = true; |
|
|
|
if (rec->opts.text_poke) { |
|
err = record__config_text_poke(rec->evlist); |
|
if (err) { |
|
pr_err("record__config_text_poke failed, error %d\n", err); |
|
goto out; |
|
} |
|
} |
|
|
|
if (record_opts__config(&rec->opts)) { |
|
err = -EINVAL; |
|
goto out; |
|
} |
|
|
|
if (rec->opts.nr_cblocks > nr_cblocks_max) |
|
rec->opts.nr_cblocks = nr_cblocks_max; |
|
pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks); |
|
|
|
pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]); |
|
pr_debug("mmap flush: %d\n", rec->opts.mmap_flush); |
|
|
|
if (rec->opts.comp_level > comp_level_max) |
|
rec->opts.comp_level = comp_level_max; |
|
pr_debug("comp level: %d\n", rec->opts.comp_level); |
|
|
|
err = __cmd_record(&record, argc, argv); |
|
out: |
|
bitmap_free(rec->affinity_mask.bits); |
|
evlist__delete(rec->evlist); |
|
symbol__exit(); |
|
auxtrace_record__free(rec->itr); |
|
out_opts: |
|
evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close); |
|
return err; |
|
} |
|
|
|
static void snapshot_sig_handler(int sig __maybe_unused) |
|
{ |
|
struct record *rec = &record; |
|
|
|
hit_auxtrace_snapshot_trigger(rec); |
|
|
|
if (switch_output_signal(rec)) |
|
trigger_hit(&switch_output_trigger); |
|
} |
|
|
|
static void alarm_sig_handler(int sig __maybe_unused) |
|
{ |
|
struct record *rec = &record; |
|
|
|
if (switch_output_time(rec)) |
|
trigger_hit(&switch_output_trigger); |
|
}
|
|
|