165 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <linux/types.h>3#include <limits.h>4#include <unistd.h>5#include <sys/prctl.h>6#include <perf/cpumap.h>7#include <perf/evlist.h>8#include <perf/mmap.h>9 10#include "debug.h"11#include "parse-events.h"12#include "evlist.h"13#include "evsel.h"14#include "record.h"15#include "thread_map.h"16#include "tests.h"17#include "util/mmap.h"18 19#define CHECK__(x) { \20 while ((x) < 0) { \21 pr_debug(#x " failed!\n"); \22 goto out_err; \23 } \24}25 26#define CHECK_NOT_NULL__(x) { \27 while ((x) == NULL) { \28 pr_debug(#x " failed!\n"); \29 goto out_err; \30 } \31}32 33static int find_comm(struct evlist *evlist, const char *comm)34{35 union perf_event *event;36 struct mmap *md;37 int i, found;38 39 found = 0;40 for (i = 0; i < evlist->core.nr_mmaps; i++) {41 md = &evlist->mmap[i];42 if (perf_mmap__read_init(&md->core) < 0)43 continue;44 while ((event = perf_mmap__read_event(&md->core)) != NULL) {45 if (event->header.type == PERF_RECORD_COMM &&46 (pid_t)event->comm.pid == getpid() &&47 (pid_t)event->comm.tid == getpid() &&48 strcmp(event->comm.comm, comm) == 0)49 found += 1;50 perf_mmap__consume(&md->core);51 }52 perf_mmap__read_done(&md->core);53 }54 return found;55}56 57/**58 * test__keep_tracking - test using a dummy software event to keep tracking.59 *60 * This function implements a test that checks that tracking events continue61 * when an event is disabled but a dummy software event is not disabled. If the62 * test passes %0 is returned, otherwise %-1 is returned.63 */64static int test__keep_tracking(struct test_suite *test __maybe_unused, int subtest __maybe_unused)65{66 struct record_opts opts = {67 .mmap_pages = UINT_MAX,68 .user_freq = UINT_MAX,69 .user_interval = ULLONG_MAX,70 .target = {71 .uses_mmap = true,72 },73 };74 struct perf_thread_map *threads = NULL;75 struct perf_cpu_map *cpus = NULL;76 struct evlist *evlist = NULL;77 struct evsel *evsel = NULL;78 int found, err = -1;79 const char *comm;80 81 threads = thread_map__new(-1, getpid(), UINT_MAX);82 CHECK_NOT_NULL__(threads);83 84 cpus = perf_cpu_map__new_online_cpus();85 CHECK_NOT_NULL__(cpus);86 87 evlist = evlist__new();88 CHECK_NOT_NULL__(evlist);89 90 perf_evlist__set_maps(&evlist->core, cpus, threads);91 92 CHECK__(parse_event(evlist, "dummy:u"));93 CHECK__(parse_event(evlist, "cycles:u"));94 95 evlist__config(evlist, &opts, NULL);96 97 evsel = evlist__first(evlist);98 99 evsel->core.attr.comm = 1;100 evsel->core.attr.disabled = 1;101 evsel->core.attr.enable_on_exec = 0;102 103 if (evlist__open(evlist) < 0) {104 pr_debug("Unable to open dummy and cycles event\n");105 err = TEST_SKIP;106 goto out_err;107 }108 109 CHECK__(evlist__mmap(evlist, UINT_MAX));110 111 /*112 * First, test that a 'comm' event can be found when the event is113 * enabled.114 */115 116 evlist__enable(evlist);117 118 comm = "Test COMM 1";119 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));120 121 evlist__disable(evlist);122 123 found = find_comm(evlist, comm);124 if (found != 1) {125 pr_debug("First time, failed to find tracking event.\n");126 goto out_err;127 }128 129 /*130 * Secondly, test that a 'comm' event can be found when the event is131 * disabled with the dummy event still enabled.132 */133 134 evlist__enable(evlist);135 136 evsel = evlist__last(evlist);137 138 CHECK__(evsel__disable(evsel));139 140 comm = "Test COMM 2";141 CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));142 143 evlist__disable(evlist);144 145 found = find_comm(evlist, comm);146 if (found != 1) {147 pr_debug("Second time, failed to find tracking event.\n");148 goto out_err;149 }150 151 err = 0;152 153out_err:154 if (evlist) {155 evlist__disable(evlist);156 evlist__delete(evlist);157 }158 perf_cpu_map__put(cpus);159 perf_thread_map__put(threads);160 161 return err;162}163 164DEFINE_SUITE("Use a dummy software event to keep tracking", keep_tracking);165