1#include <linux/types.h>
  2#include <unistd.h>
  3#include <sys/prctl.h>
  4
  5#include "parse-events.h"
  6#include "evlist.h"
  7#include "evsel.h"
  8#include "thread_map.h"
  9#include "cpumap.h"
 10#include "tests.h"
 11
 12#define CHECK__(x) {				\
 13	while ((x) < 0) {			\
 14		pr_debug(#x " failed!\n");	\
 15		goto out_err;			\
 16	}					\
 17}
 18
 19#define CHECK_NOT_NULL__(x) {			\
 20	while ((x) == NULL) {			\
 21		pr_debug(#x " failed!\n");	\
 22		goto out_err;			\
 23	}					\
 24}
 25
 26static int find_comm(struct perf_evlist *evlist, const char *comm)
 27{
 28	union perf_event *event;
 29	int i, found;
 30
 31	found = 0;
 32	for (i = 0; i < evlist->nr_mmaps; i++) {
 33		while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
 34			if (event->header.type == PERF_RECORD_COMM &&
 35			    (pid_t)event->comm.pid == getpid() &&
 36			    (pid_t)event->comm.tid == getpid() &&
 37			    strcmp(event->comm.comm, comm) == 0)
 38				found += 1;
 39			perf_evlist__mmap_consume(evlist, i);
 40		}
 41	}
 42	return found;
 43}
 44
 45/**
 46 * test__keep_tracking - test using a dummy software event to keep tracking.
 47 *
 48 * This function implements a test that checks that tracking events continue
 49 * when an event is disabled but a dummy software event is not disabled.  If the
 50 * test passes %0 is returned, otherwise %-1 is returned.
 51 */
 52int test__keep_tracking(int subtest __maybe_unused)
 53{
 54	struct record_opts opts = {
 55		.mmap_pages	     = UINT_MAX,
 56		.user_freq	     = UINT_MAX,
 57		.user_interval	     = ULLONG_MAX,
 58		.target		     = {
 59			.uses_mmap   = true,
 60		},
 61	};
 62	struct thread_map *threads = NULL;
 63	struct cpu_map *cpus = NULL;
 64	struct perf_evlist *evlist = NULL;
 65	struct perf_evsel *evsel = NULL;
 66	int found, err = -1;
 67	const char *comm;
 68
 69	threads = thread_map__new(-1, getpid(), UINT_MAX);
 70	CHECK_NOT_NULL__(threads);
 71
 72	cpus = cpu_map__new(NULL);
 73	CHECK_NOT_NULL__(cpus);
 74
 75	evlist = perf_evlist__new();
 76	CHECK_NOT_NULL__(evlist);
 77
 78	perf_evlist__set_maps(evlist, cpus, threads);
 79
 80	CHECK__(parse_events(evlist, "dummy:u", NULL));
 81	CHECK__(parse_events(evlist, "cycles:u", NULL));
 82
 83	perf_evlist__config(evlist, &opts);
 84
 85	evsel = perf_evlist__first(evlist);
 86
 87	evsel->attr.comm = 1;
 88	evsel->attr.disabled = 1;
 89	evsel->attr.enable_on_exec = 0;
 90
 91	if (perf_evlist__open(evlist) < 0) {
 92		pr_debug("Unable to open dummy and cycles event\n");
 93		err = TEST_SKIP;
 94		goto out_err;
 95	}
 96
 97	CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));
 98
 99	/*
100	 * First, test that a 'comm' event can be found when the event is
101	 * enabled.
102	 */
103
104	perf_evlist__enable(evlist);
105
106	comm = "Test COMM 1";
107	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
108
109	perf_evlist__disable(evlist);
110
111	found = find_comm(evlist, comm);
112	if (found != 1) {
113		pr_debug("First time, failed to find tracking event.\n");
114		goto out_err;
115	}
116
117	/*
118	 * Secondly, test that a 'comm' event can be found when the event is
119	 * disabled with the dummy event still enabled.
120	 */
121
122	perf_evlist__enable(evlist);
123
124	evsel = perf_evlist__last(evlist);
125
126	CHECK__(perf_evsel__disable(evsel));
127
128	comm = "Test COMM 2";
129	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
130
131	perf_evlist__disable(evlist);
132
133	found = find_comm(evlist, comm);
134	if (found != 1) {
135		pr_debug("Seconf time, failed to find tracking event.\n");
136		goto out_err;
137	}
138
139	err = 0;
140
141out_err:
142	if (evlist) {
143		perf_evlist__disable(evlist);
144		perf_evlist__delete(evlist);
145	} else {
146		cpu_map__put(cpus);
147		thread_map__put(threads);
148	}
149
150	return err;
151}