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162 lines
3.6 KiB
162 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/types.h> |
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#include <limits.h> |
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#include <unistd.h> |
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#include <sys/prctl.h> |
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#include <perf/cpumap.h> |
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#include <perf/evlist.h> |
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#include <perf/mmap.h> |
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#include "debug.h" |
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#include "parse-events.h" |
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#include "evlist.h" |
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#include "evsel.h" |
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#include "record.h" |
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#include "thread_map.h" |
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#include "tests.h" |
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#include "util/mmap.h" |
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#define CHECK__(x) { \ |
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while ((x) < 0) { \ |
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pr_debug(#x " failed!\n"); \ |
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goto out_err; \ |
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} \ |
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} |
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#define CHECK_NOT_NULL__(x) { \ |
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while ((x) == NULL) { \ |
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pr_debug(#x " failed!\n"); \ |
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goto out_err; \ |
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} \ |
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} |
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static int find_comm(struct evlist *evlist, const char *comm) |
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{ |
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union perf_event *event; |
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struct mmap *md; |
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int i, found; |
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found = 0; |
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for (i = 0; i < evlist->core.nr_mmaps; i++) { |
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md = &evlist->mmap[i]; |
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if (perf_mmap__read_init(&md->core) < 0) |
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continue; |
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while ((event = perf_mmap__read_event(&md->core)) != NULL) { |
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if (event->header.type == PERF_RECORD_COMM && |
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(pid_t)event->comm.pid == getpid() && |
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(pid_t)event->comm.tid == getpid() && |
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strcmp(event->comm.comm, comm) == 0) |
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found += 1; |
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perf_mmap__consume(&md->core); |
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} |
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perf_mmap__read_done(&md->core); |
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} |
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return found; |
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} |
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/** |
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* test__keep_tracking - test using a dummy software event to keep tracking. |
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* |
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* This function implements a test that checks that tracking events continue |
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* when an event is disabled but a dummy software event is not disabled. If the |
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* test passes %0 is returned, otherwise %-1 is returned. |
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*/ |
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int test__keep_tracking(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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.mmap_pages = UINT_MAX, |
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.user_freq = UINT_MAX, |
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.user_interval = ULLONG_MAX, |
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.target = { |
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.uses_mmap = true, |
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}, |
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}; |
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struct perf_thread_map *threads = NULL; |
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struct perf_cpu_map *cpus = NULL; |
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struct evlist *evlist = NULL; |
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struct evsel *evsel = NULL; |
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int found, err = -1; |
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const char *comm; |
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threads = thread_map__new(-1, getpid(), UINT_MAX); |
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CHECK_NOT_NULL__(threads); |
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cpus = perf_cpu_map__new(NULL); |
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CHECK_NOT_NULL__(cpus); |
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evlist = evlist__new(); |
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CHECK_NOT_NULL__(evlist); |
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perf_evlist__set_maps(&evlist->core, cpus, threads); |
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CHECK__(parse_events(evlist, "dummy:u", NULL)); |
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CHECK__(parse_events(evlist, "cycles:u", NULL)); |
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evlist__config(evlist, &opts, NULL); |
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evsel = evlist__first(evlist); |
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evsel->core.attr.comm = 1; |
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evsel->core.attr.disabled = 1; |
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evsel->core.attr.enable_on_exec = 0; |
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if (evlist__open(evlist) < 0) { |
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pr_debug("Unable to open dummy and cycles event\n"); |
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err = TEST_SKIP; |
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goto out_err; |
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} |
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CHECK__(evlist__mmap(evlist, UINT_MAX)); |
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/* |
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* First, test that a 'comm' event can be found when the event is |
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* enabled. |
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*/ |
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evlist__enable(evlist); |
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comm = "Test COMM 1"; |
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CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); |
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evlist__disable(evlist); |
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found = find_comm(evlist, comm); |
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if (found != 1) { |
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pr_debug("First time, failed to find tracking event.\n"); |
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goto out_err; |
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} |
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/* |
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* Secondly, test that a 'comm' event can be found when the event is |
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* disabled with the dummy event still enabled. |
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*/ |
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evlist__enable(evlist); |
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evsel = evlist__last(evlist); |
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CHECK__(evsel__disable(evsel)); |
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comm = "Test COMM 2"; |
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CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0)); |
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evlist__disable(evlist); |
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found = find_comm(evlist, comm); |
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if (found != 1) { |
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pr_debug("Second time, failed to find tracking event.\n"); |
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goto out_err; |
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} |
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err = 0; |
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out_err: |
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if (evlist) { |
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evlist__disable(evlist); |
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evlist__delete(evlist); |
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} |
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perf_cpu_map__put(cpus); |
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perf_thread_map__put(threads); |
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return err; |
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}
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