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476 lines
11 KiB
476 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <stdlib.h> |
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#include <stddef.h> |
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#include <ftw.h> |
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#include <fcntl.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include <pthread.h> |
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#include <sys/mman.h> |
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#include <sys/wait.h> |
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#include <linux/kernel.h> |
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#include <linux/time64.h> |
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#include <linux/list.h> |
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#include <linux/err.h> |
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#include <internal/lib.h> |
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#include <subcmd/parse-options.h> |
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#include "bench.h" |
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#include "util/data.h" |
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#include "util/stat.h" |
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#include "util/debug.h" |
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#include "util/event.h" |
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#include "util/symbol.h" |
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#include "util/session.h" |
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#include "util/build-id.h" |
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#include "util/synthetic-events.h" |
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#define MMAP_DEV_MAJOR 8 |
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#define DSO_MMAP_RATIO 4 |
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static unsigned int iterations = 100; |
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static unsigned int nr_mmaps = 100; |
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static unsigned int nr_samples = 100; /* samples per mmap */ |
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static u64 bench_sample_type; |
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static u16 bench_id_hdr_size; |
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struct bench_data { |
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int pid; |
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int input_pipe[2]; |
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int output_pipe[2]; |
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pthread_t th; |
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}; |
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struct bench_dso { |
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struct list_head list; |
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char *name; |
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int ino; |
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}; |
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static int nr_dsos; |
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static struct bench_dso *dsos; |
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extern int cmd_inject(int argc, const char *argv[]); |
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static const struct option options[] = { |
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OPT_UINTEGER('i', "iterations", &iterations, |
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"Number of iterations used to compute average (default: 100)"), |
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OPT_UINTEGER('m', "nr-mmaps", &nr_mmaps, |
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"Number of mmap events for each iteration (default: 100)"), |
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OPT_UINTEGER('n', "nr-samples", &nr_samples, |
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"Number of sample events per mmap event (default: 100)"), |
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OPT_INCR('v', "verbose", &verbose, |
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"be more verbose (show iteration count, DSO name, etc)"), |
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OPT_END() |
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}; |
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static const char *const bench_usage[] = { |
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"perf bench internals inject-build-id <options>", |
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NULL |
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}; |
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/* |
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* Helper for collect_dso that adds the given file as a dso to dso_list |
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* if it contains a build-id. Stops after collecting 4 times more than |
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* we need (for MMAP2 events). |
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*/ |
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static int add_dso(const char *fpath, const struct stat *sb __maybe_unused, |
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int typeflag, struct FTW *ftwbuf __maybe_unused) |
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{ |
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struct bench_dso *dso = &dsos[nr_dsos]; |
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struct build_id bid; |
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if (typeflag == FTW_D || typeflag == FTW_SL) |
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return 0; |
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if (filename__read_build_id(fpath, &bid) < 0) |
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return 0; |
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dso->name = realpath(fpath, NULL); |
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if (dso->name == NULL) |
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return -1; |
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dso->ino = nr_dsos++; |
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pr_debug2(" Adding DSO: %s\n", fpath); |
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/* stop if we collected enough DSOs */ |
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if ((unsigned int)nr_dsos == DSO_MMAP_RATIO * nr_mmaps) |
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return 1; |
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return 0; |
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} |
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static void collect_dso(void) |
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{ |
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dsos = calloc(nr_mmaps * DSO_MMAP_RATIO, sizeof(*dsos)); |
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if (dsos == NULL) { |
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printf(" Memory allocation failed\n"); |
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exit(1); |
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} |
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if (nftw("/usr/lib/", add_dso, 10, FTW_PHYS) < 0) |
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return; |
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pr_debug(" Collected %d DSOs\n", nr_dsos); |
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} |
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static void release_dso(void) |
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{ |
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int i; |
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for (i = 0; i < nr_dsos; i++) { |
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struct bench_dso *dso = &dsos[i]; |
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free(dso->name); |
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} |
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free(dsos); |
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} |
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/* Fake address used by mmap and sample events */ |
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static u64 dso_map_addr(struct bench_dso *dso) |
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{ |
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return 0x400000ULL + dso->ino * 8192ULL; |
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} |
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static u32 synthesize_attr(struct bench_data *data) |
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{ |
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union perf_event event; |
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memset(&event, 0, sizeof(event.attr) + sizeof(u64)); |
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event.header.type = PERF_RECORD_HEADER_ATTR; |
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event.header.size = sizeof(event.attr) + sizeof(u64); |
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event.attr.attr.type = PERF_TYPE_SOFTWARE; |
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event.attr.attr.config = PERF_COUNT_SW_TASK_CLOCK; |
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event.attr.attr.exclude_kernel = 1; |
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event.attr.attr.sample_id_all = 1; |
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event.attr.attr.sample_type = bench_sample_type; |
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return writen(data->input_pipe[1], &event, event.header.size); |
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} |
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static u32 synthesize_fork(struct bench_data *data) |
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{ |
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union perf_event event; |
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memset(&event, 0, sizeof(event.fork) + bench_id_hdr_size); |
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event.header.type = PERF_RECORD_FORK; |
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event.header.misc = PERF_RECORD_MISC_FORK_EXEC; |
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event.header.size = sizeof(event.fork) + bench_id_hdr_size; |
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event.fork.ppid = 1; |
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event.fork.ptid = 1; |
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event.fork.pid = data->pid; |
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event.fork.tid = data->pid; |
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return writen(data->input_pipe[1], &event, event.header.size); |
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} |
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static u32 synthesize_mmap(struct bench_data *data, struct bench_dso *dso, |
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u64 timestamp) |
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{ |
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union perf_event event; |
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size_t len = offsetof(struct perf_record_mmap2, filename); |
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u64 *id_hdr_ptr = (void *)&event; |
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int ts_idx; |
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len += roundup(strlen(dso->name) + 1, 8) + bench_id_hdr_size; |
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memset(&event, 0, min(len, sizeof(event.mmap2))); |
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event.header.type = PERF_RECORD_MMAP2; |
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event.header.misc = PERF_RECORD_MISC_USER; |
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event.header.size = len; |
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event.mmap2.pid = data->pid; |
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event.mmap2.tid = data->pid; |
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event.mmap2.maj = MMAP_DEV_MAJOR; |
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event.mmap2.ino = dso->ino; |
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strcpy(event.mmap2.filename, dso->name); |
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event.mmap2.start = dso_map_addr(dso); |
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event.mmap2.len = 4096; |
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event.mmap2.prot = PROT_EXEC; |
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if (len > sizeof(event.mmap2)) { |
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/* write mmap2 event first */ |
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writen(data->input_pipe[1], &event, len - bench_id_hdr_size); |
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/* zero-fill sample id header */ |
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memset(id_hdr_ptr, 0, bench_id_hdr_size); |
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/* put timestamp in the right position */ |
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ts_idx = (bench_id_hdr_size / sizeof(u64)) - 2; |
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id_hdr_ptr[ts_idx] = timestamp; |
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writen(data->input_pipe[1], id_hdr_ptr, bench_id_hdr_size); |
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} else { |
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ts_idx = (len / sizeof(u64)) - 2; |
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id_hdr_ptr[ts_idx] = timestamp; |
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writen(data->input_pipe[1], &event, len); |
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} |
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return len; |
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} |
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static u32 synthesize_sample(struct bench_data *data, struct bench_dso *dso, |
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u64 timestamp) |
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{ |
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union perf_event event; |
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struct perf_sample sample = { |
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.tid = data->pid, |
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.pid = data->pid, |
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.ip = dso_map_addr(dso), |
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.time = timestamp, |
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}; |
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event.header.type = PERF_RECORD_SAMPLE; |
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event.header.misc = PERF_RECORD_MISC_USER; |
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event.header.size = perf_event__sample_event_size(&sample, bench_sample_type, 0); |
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perf_event__synthesize_sample(&event, bench_sample_type, 0, &sample); |
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return writen(data->input_pipe[1], &event, event.header.size); |
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} |
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static u32 synthesize_flush(struct bench_data *data) |
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{ |
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struct perf_event_header header = { |
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.size = sizeof(header), |
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.type = PERF_RECORD_FINISHED_ROUND, |
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}; |
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return writen(data->input_pipe[1], &header, header.size); |
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} |
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static void *data_reader(void *arg) |
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{ |
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struct bench_data *data = arg; |
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char buf[8192]; |
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int flag; |
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int n; |
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flag = fcntl(data->output_pipe[0], F_GETFL); |
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fcntl(data->output_pipe[0], F_SETFL, flag | O_NONBLOCK); |
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/* read out data from child */ |
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while (true) { |
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n = read(data->output_pipe[0], buf, sizeof(buf)); |
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if (n > 0) |
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continue; |
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if (n == 0) |
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break; |
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if (errno != EINTR && errno != EAGAIN) |
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break; |
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usleep(100); |
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} |
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close(data->output_pipe[0]); |
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return NULL; |
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} |
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static int setup_injection(struct bench_data *data, bool build_id_all) |
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{ |
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int ready_pipe[2]; |
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int dev_null_fd; |
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char buf; |
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if (pipe(ready_pipe) < 0) |
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return -1; |
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if (pipe(data->input_pipe) < 0) |
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return -1; |
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if (pipe(data->output_pipe) < 0) |
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return -1; |
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data->pid = fork(); |
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if (data->pid < 0) |
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return -1; |
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if (data->pid == 0) { |
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const char **inject_argv; |
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int inject_argc = 2; |
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close(data->input_pipe[1]); |
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close(data->output_pipe[0]); |
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close(ready_pipe[0]); |
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dup2(data->input_pipe[0], STDIN_FILENO); |
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close(data->input_pipe[0]); |
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dup2(data->output_pipe[1], STDOUT_FILENO); |
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close(data->output_pipe[1]); |
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dev_null_fd = open("/dev/null", O_WRONLY); |
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if (dev_null_fd < 0) |
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exit(1); |
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dup2(dev_null_fd, STDERR_FILENO); |
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if (build_id_all) |
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inject_argc++; |
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inject_argv = calloc(inject_argc + 1, sizeof(*inject_argv)); |
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if (inject_argv == NULL) |
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exit(1); |
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inject_argv[0] = strdup("inject"); |
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inject_argv[1] = strdup("-b"); |
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if (build_id_all) |
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inject_argv[2] = strdup("--buildid-all"); |
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/* signal that we're ready to go */ |
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close(ready_pipe[1]); |
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cmd_inject(inject_argc, inject_argv); |
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exit(0); |
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} |
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pthread_create(&data->th, NULL, data_reader, data); |
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close(ready_pipe[1]); |
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close(data->input_pipe[0]); |
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close(data->output_pipe[1]); |
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/* wait for child ready */ |
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if (read(ready_pipe[0], &buf, 1) < 0) |
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return -1; |
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close(ready_pipe[0]); |
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return 0; |
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} |
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static int inject_build_id(struct bench_data *data, u64 *max_rss) |
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{ |
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int status; |
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unsigned int i, k; |
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struct rusage rusage; |
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u64 len = 0; |
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/* this makes the child to run */ |
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if (perf_header__write_pipe(data->input_pipe[1]) < 0) |
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return -1; |
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len += synthesize_attr(data); |
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len += synthesize_fork(data); |
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for (i = 0; i < nr_mmaps; i++) { |
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int idx = rand() % (nr_dsos - 1); |
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struct bench_dso *dso = &dsos[idx]; |
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u64 timestamp = rand() % 1000000; |
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pr_debug2(" [%d] injecting: %s\n", i+1, dso->name); |
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len += synthesize_mmap(data, dso, timestamp); |
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for (k = 0; k < nr_samples; k++) |
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len += synthesize_sample(data, dso, timestamp + k * 1000); |
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if ((i + 1) % 10 == 0) |
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len += synthesize_flush(data); |
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} |
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/* tihs makes the child to finish */ |
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close(data->input_pipe[1]); |
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wait4(data->pid, &status, 0, &rusage); |
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*max_rss = rusage.ru_maxrss; |
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pr_debug(" Child %d exited with %d\n", data->pid, status); |
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return 0; |
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} |
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static void do_inject_loop(struct bench_data *data, bool build_id_all) |
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{ |
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unsigned int i; |
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struct stats time_stats, mem_stats; |
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double time_average, time_stddev; |
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double mem_average, mem_stddev; |
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init_stats(&time_stats); |
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init_stats(&mem_stats); |
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pr_debug(" Build-id%s injection benchmark\n", build_id_all ? "-all" : ""); |
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for (i = 0; i < iterations; i++) { |
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struct timeval start, end, diff; |
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u64 runtime_us, max_rss; |
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pr_debug(" Iteration #%d\n", i+1); |
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if (setup_injection(data, build_id_all) < 0) { |
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printf(" Build-id injection setup failed\n"); |
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break; |
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} |
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gettimeofday(&start, NULL); |
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if (inject_build_id(data, &max_rss) < 0) { |
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printf(" Build-id injection failed\n"); |
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break; |
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} |
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gettimeofday(&end, NULL); |
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timersub(&end, &start, &diff); |
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runtime_us = diff.tv_sec * USEC_PER_SEC + diff.tv_usec; |
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update_stats(&time_stats, runtime_us); |
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update_stats(&mem_stats, max_rss); |
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pthread_join(data->th, NULL); |
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} |
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time_average = avg_stats(&time_stats) / USEC_PER_MSEC; |
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time_stddev = stddev_stats(&time_stats) / USEC_PER_MSEC; |
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printf(" Average build-id%s injection took: %.3f msec (+- %.3f msec)\n", |
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build_id_all ? "-all" : "", time_average, time_stddev); |
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/* each iteration, it processes MMAP2 + BUILD_ID + nr_samples * SAMPLE */ |
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time_average = avg_stats(&time_stats) / (nr_mmaps * (nr_samples + 2)); |
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time_stddev = stddev_stats(&time_stats) / (nr_mmaps * (nr_samples + 2)); |
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printf(" Average time per event: %.3f usec (+- %.3f usec)\n", |
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time_average, time_stddev); |
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mem_average = avg_stats(&mem_stats); |
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mem_stddev = stddev_stats(&mem_stats); |
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printf(" Average memory usage: %.0f KB (+- %.0f KB)\n", |
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mem_average, mem_stddev); |
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} |
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static int do_inject_loops(struct bench_data *data) |
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{ |
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srand(time(NULL)); |
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symbol__init(NULL); |
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bench_sample_type = PERF_SAMPLE_IDENTIFIER | PERF_SAMPLE_IP; |
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bench_sample_type |= PERF_SAMPLE_TID | PERF_SAMPLE_TIME; |
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bench_id_hdr_size = 32; |
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collect_dso(); |
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if (nr_dsos == 0) { |
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printf(" Cannot collect DSOs for injection\n"); |
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return -1; |
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} |
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do_inject_loop(data, false); |
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do_inject_loop(data, true); |
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release_dso(); |
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return 0; |
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} |
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int bench_inject_build_id(int argc, const char **argv) |
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{ |
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struct bench_data data; |
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argc = parse_options(argc, argv, options, bench_usage, 0); |
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if (argc) { |
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usage_with_options(bench_usage, options); |
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exit(EXIT_FAILURE); |
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} |
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return do_inject_loops(&data); |
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} |
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