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129 lines
3.2 KiB
129 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <errno.h> |
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#include <inttypes.h> |
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/* For the CPU_* macros */ |
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#include <pthread.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 <api/fs/fs.h> |
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#include <linux/err.h> |
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#include <linux/string.h> |
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#include <api/fs/tracing_path.h> |
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#include "evsel.h" |
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#include "tests.h" |
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#include "thread_map.h" |
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#include <perf/cpumap.h> |
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#include "debug.h" |
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#include "stat.h" |
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#include "util/counts.h" |
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int test__openat_syscall_event_on_all_cpus(struct test *test __maybe_unused, int subtest __maybe_unused) |
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{ |
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int err = -1, fd, cpu; |
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struct perf_cpu_map *cpus; |
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struct evsel *evsel; |
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unsigned int nr_openat_calls = 111, i; |
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cpu_set_t cpu_set; |
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struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX); |
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char sbuf[STRERR_BUFSIZE]; |
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char errbuf[BUFSIZ]; |
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if (threads == NULL) { |
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pr_debug("thread_map__new\n"); |
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return -1; |
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} |
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cpus = perf_cpu_map__new(NULL); |
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if (cpus == NULL) { |
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pr_debug("perf_cpu_map__new\n"); |
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goto out_thread_map_delete; |
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} |
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CPU_ZERO(&cpu_set); |
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evsel = evsel__newtp("syscalls", "sys_enter_openat"); |
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if (IS_ERR(evsel)) { |
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tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat"); |
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pr_debug("%s\n", errbuf); |
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goto out_cpu_map_delete; |
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} |
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if (evsel__open(evsel, cpus, threads) < 0) { |
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pr_debug("failed to open counter: %s, " |
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"tweak /proc/sys/kernel/perf_event_paranoid?\n", |
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str_error_r(errno, sbuf, sizeof(sbuf))); |
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goto out_evsel_delete; |
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} |
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for (cpu = 0; cpu < cpus->nr; ++cpu) { |
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unsigned int ncalls = nr_openat_calls + cpu; |
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/* |
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* XXX eventually lift this restriction in a way that |
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* keeps perf building on older glibc installations |
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* without CPU_ALLOC. 1024 cpus in 2010 still seems |
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* a reasonable upper limit tho :-) |
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*/ |
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if (cpus->map[cpu] >= CPU_SETSIZE) { |
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pr_debug("Ignoring CPU %d\n", cpus->map[cpu]); |
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continue; |
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} |
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CPU_SET(cpus->map[cpu], &cpu_set); |
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if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { |
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pr_debug("sched_setaffinity() failed on CPU %d: %s ", |
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cpus->map[cpu], |
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str_error_r(errno, sbuf, sizeof(sbuf))); |
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goto out_close_fd; |
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} |
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for (i = 0; i < ncalls; ++i) { |
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fd = openat(0, "/etc/passwd", O_RDONLY); |
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close(fd); |
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} |
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CPU_CLR(cpus->map[cpu], &cpu_set); |
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} |
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/* |
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* Here we need to explicitly preallocate the counts, as if |
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* we use the auto allocation it will allocate just for 1 cpu, |
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* as we start by cpu 0. |
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*/ |
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if (evsel__alloc_counts(evsel, cpus->nr, 1) < 0) { |
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pr_debug("evsel__alloc_counts(ncpus=%d)\n", cpus->nr); |
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goto out_close_fd; |
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} |
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err = 0; |
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for (cpu = 0; cpu < cpus->nr; ++cpu) { |
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unsigned int expected; |
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if (cpus->map[cpu] >= CPU_SETSIZE) |
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continue; |
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if (evsel__read_on_cpu(evsel, cpu, 0) < 0) { |
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pr_debug("evsel__read_on_cpu\n"); |
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err = -1; |
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break; |
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} |
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expected = nr_openat_calls + cpu; |
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if (perf_counts(evsel->counts, cpu, 0)->val != expected) { |
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pr_debug("evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n", |
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expected, cpus->map[cpu], perf_counts(evsel->counts, cpu, 0)->val); |
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err = -1; |
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} |
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} |
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evsel__free_counts(evsel); |
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out_close_fd: |
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perf_evsel__close_fd(&evsel->core); |
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out_evsel_delete: |
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evsel__delete(evsel); |
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out_cpu_map_delete: |
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perf_cpu_map__put(cpus); |
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out_thread_map_delete: |
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perf_thread_map__put(threads); |
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return err; |
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}
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