// 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 CLR_() macros */
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#include <pthread.h>
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#include <sched.h>
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#include "evlist.h"
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#include "evsel.h"
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#include "perf.h"
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#include "debug.h"
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#include "tests.h"
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static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp)
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{
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int i, cpu = -1, nrcpus = 1024;
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realloc:
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CPU_ZERO(maskp);
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if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) {
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if (errno == EINVAL && nrcpus < (1024 << 8)) {
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nrcpus = nrcpus << 2;
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goto realloc;
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}
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perror("sched_getaffinity");
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return -1;
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}
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for (i = 0; i < nrcpus; i++) {
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if (CPU_ISSET(i, maskp)) {
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if (cpu == -1)
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cpu = i;
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else
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CPU_CLR(i, maskp);
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}
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}
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return cpu;
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}
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int test__PERF_RECORD(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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struct record_opts opts = {
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.target = {
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.uid = UINT_MAX,
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.uses_mmap = true,
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},
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.no_buffering = true,
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.mmap_pages = 256,
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};
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cpu_set_t cpu_mask;
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size_t cpu_mask_size = sizeof(cpu_mask);
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struct perf_evlist *evlist = perf_evlist__new_dummy();
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struct perf_evsel *evsel;
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struct perf_sample sample;
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const char *cmd = "sleep";
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const char *argv[] = { cmd, "1", NULL, };
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char *bname, *mmap_filename;
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u64 prev_time = 0;
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bool found_cmd_mmap = false,
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found_libc_mmap = false,
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found_vdso_mmap = false,
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found_ld_mmap = false;
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int err = -1, errs = 0, i, wakeups = 0;
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u32 cpu;
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int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
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char sbuf[STRERR_BUFSIZE];
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if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */
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evlist = perf_evlist__new_default();
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if (evlist == NULL) {
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pr_debug("Not enough memory to create evlist\n");
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goto out;
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}
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/*
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* Create maps of threads and cpus to monitor. In this case
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* we start with all threads and cpus (-1, -1) but then in
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* perf_evlist__prepare_workload we'll fill in the only thread
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* we're monitoring, the one forked there.
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*/
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err = perf_evlist__create_maps(evlist, &opts.target);
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if (err < 0) {
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pr_debug("Not enough memory to create thread/cpu maps\n");
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goto out_delete_evlist;
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}
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/*
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* Prepare the workload in argv[] to run, it'll fork it, and then wait
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* for perf_evlist__start_workload() to exec it. This is done this way
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* so that we have time to open the evlist (calling sys_perf_event_open
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* on all the fds) and then mmap them.
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*/
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err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL);
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if (err < 0) {
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pr_debug("Couldn't run the workload!\n");
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goto out_delete_evlist;
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}
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/*
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* Config the evsels, setting attr->comm on the first one, etc.
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*/
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evsel = perf_evlist__first(evlist);
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perf_evsel__set_sample_bit(evsel, CPU);
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perf_evsel__set_sample_bit(evsel, TID);
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perf_evsel__set_sample_bit(evsel, TIME);
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perf_evlist__config(evlist, &opts, NULL);
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err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask);
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if (err < 0) {
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pr_debug("sched__get_first_possible_cpu: %s\n",
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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cpu = err;
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/*
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* So that we can check perf_sample.cpu on all the samples.
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*/
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if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) {
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pr_debug("sched_setaffinity: %s\n",
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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/*
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* Call sys_perf_event_open on all the fds on all the evsels,
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* grouping them if asked to.
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*/
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err = perf_evlist__open(evlist);
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if (err < 0) {
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pr_debug("perf_evlist__open: %s\n",
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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/*
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* mmap the first fd on a given CPU and ask for events for the other
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* fds in the same CPU to be injected in the same mmap ring buffer
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* (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
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*/
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err = perf_evlist__mmap(evlist, opts.mmap_pages);
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if (err < 0) {
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pr_debug("perf_evlist__mmap: %s\n",
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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/*
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* Now that all is properly set up, enable the events, they will
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* count just on workload.pid, which will start...
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*/
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perf_evlist__enable(evlist);
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/*
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* Now!
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*/
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perf_evlist__start_workload(evlist);
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while (1) {
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int before = total_events;
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for (i = 0; i < evlist->nr_mmaps; i++) {
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union perf_event *event;
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struct perf_mmap *md;
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md = &evlist->mmap[i];
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if (perf_mmap__read_init(md) < 0)
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continue;
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while ((event = perf_mmap__read_event(md)) != NULL) {
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const u32 type = event->header.type;
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const char *name = perf_event__name(type);
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++total_events;
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if (type < PERF_RECORD_MAX)
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nr_events[type]++;
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err = perf_evlist__parse_sample(evlist, event, &sample);
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if (err < 0) {
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if (verbose > 0)
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perf_event__fprintf(event, stderr);
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pr_debug("Couldn't parse sample\n");
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goto out_delete_evlist;
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}
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if (verbose > 0) {
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pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
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perf_event__fprintf(event, stderr);
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}
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if (prev_time > sample.time) {
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pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
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name, prev_time, sample.time);
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++errs;
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}
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prev_time = sample.time;
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if (sample.cpu != cpu) {
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pr_debug("%s with unexpected cpu, expected %d, got %d\n",
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name, cpu, sample.cpu);
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++errs;
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}
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if ((pid_t)sample.pid != evlist->workload.pid) {
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pr_debug("%s with unexpected pid, expected %d, got %d\n",
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name, evlist->workload.pid, sample.pid);
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++errs;
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}
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if ((pid_t)sample.tid != evlist->workload.pid) {
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pr_debug("%s with unexpected tid, expected %d, got %d\n",
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name, evlist->workload.pid, sample.tid);
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++errs;
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}
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if ((type == PERF_RECORD_COMM ||
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type == PERF_RECORD_MMAP ||
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type == PERF_RECORD_MMAP2 ||
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type == PERF_RECORD_FORK ||
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type == PERF_RECORD_EXIT) &&
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(pid_t)event->comm.pid != evlist->workload.pid) {
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pr_debug("%s with unexpected pid/tid\n", name);
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++errs;
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}
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if ((type == PERF_RECORD_COMM ||
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type == PERF_RECORD_MMAP ||
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type == PERF_RECORD_MMAP2) &&
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event->comm.pid != event->comm.tid) {
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pr_debug("%s with different pid/tid!\n", name);
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++errs;
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}
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switch (type) {
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case PERF_RECORD_COMM:
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if (strcmp(event->comm.comm, cmd)) {
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pr_debug("%s with unexpected comm!\n", name);
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++errs;
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}
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break;
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case PERF_RECORD_EXIT:
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goto found_exit;
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case PERF_RECORD_MMAP:
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mmap_filename = event->mmap.filename;
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goto check_bname;
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case PERF_RECORD_MMAP2:
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mmap_filename = event->mmap2.filename;
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check_bname:
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bname = strrchr(mmap_filename, '/');
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if (bname != NULL) {
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if (!found_cmd_mmap)
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found_cmd_mmap = !strcmp(bname + 1, cmd);
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if (!found_libc_mmap)
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found_libc_mmap = !strncmp(bname + 1, "libc", 4);
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if (!found_ld_mmap)
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found_ld_mmap = !strncmp(bname + 1, "ld", 2);
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} else if (!found_vdso_mmap)
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found_vdso_mmap = !strcmp(mmap_filename, "[vdso]");
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break;
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case PERF_RECORD_SAMPLE:
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/* Just ignore samples for now */
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break;
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default:
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pr_debug("Unexpected perf_event->header.type %d!\n",
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type);
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++errs;
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}
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perf_mmap__consume(md);
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}
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perf_mmap__read_done(md);
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}
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/*
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* We don't use poll here because at least at 3.1 times the
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* PERF_RECORD_{!SAMPLE} events don't honour
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* perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
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*/
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if (total_events == before && false)
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perf_evlist__poll(evlist, -1);
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sleep(1);
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if (++wakeups > 5) {
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pr_debug("No PERF_RECORD_EXIT event!\n");
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break;
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}
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}
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found_exit:
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if (nr_events[PERF_RECORD_COMM] > 1) {
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pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
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++errs;
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}
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if (nr_events[PERF_RECORD_COMM] == 0) {
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pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
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++errs;
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}
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if (!found_cmd_mmap) {
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pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
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++errs;
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}
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if (!found_libc_mmap) {
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pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
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++errs;
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}
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if (!found_ld_mmap) {
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pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
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++errs;
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}
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if (!found_vdso_mmap) {
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pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
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++errs;
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}
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out_delete_evlist:
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perf_evlist__delete(evlist);
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out:
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return (err < 0 || errs > 0) ? -1 : 0;
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}
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