1#include <sys/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(void)
 53{
 54	struct record_opts opts = {
 55		.mmap_pages	     = UINT_MAX,
 56		.user_freq	     = UINT_MAX,
 57		.user_interval	     = ULLONG_MAX,
 58		.freq		     = 4000,
 59		.target		     = {
 60			.uses_mmap   = true,
 61		},
 62	};
 63	struct thread_map *threads = NULL;
 64	struct cpu_map *cpus = NULL;
 65	struct perf_evlist *evlist = NULL;
 66	struct perf_evsel *evsel = NULL;
 67	int found, err = -1;
 68	const char *comm;
 69
 70	threads = thread_map__new(-1, getpid(), UINT_MAX);
 71	CHECK_NOT_NULL__(threads);
 72
 73	cpus = cpu_map__new(NULL);
 74	CHECK_NOT_NULL__(cpus);
 75
 76	evlist = perf_evlist__new();
 77	CHECK_NOT_NULL__(evlist);
 78
 79	perf_evlist__set_maps(evlist, cpus, threads);
 80
 81	CHECK__(parse_events(evlist, "dummy:u"));
 82	CHECK__(parse_events(evlist, "cycles:u"));
 83
 84	perf_evlist__config(evlist, &opts);
 85
 86	evsel = perf_evlist__first(evlist);
 87
 88	evsel->attr.comm = 1;
 89	evsel->attr.disabled = 1;
 90	evsel->attr.enable_on_exec = 0;
 91
 92	if (perf_evlist__open(evlist) < 0) {
 93		fprintf(stderr, " (not supported)");
 94		err = 0;
 95		goto out_err;
 96	}
 97
 98	CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));
 99
100	/*
101	 * First, test that a 'comm' event can be found when the event is
102	 * enabled.
103	 */
104
105	perf_evlist__enable(evlist);
106
107	comm = "Test COMM 1";
108	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
109
110	perf_evlist__disable(evlist);
111
112	found = find_comm(evlist, comm);
113	if (found != 1) {
114		pr_debug("First time, failed to find tracking event.\n");
115		goto out_err;
116	}
117
118	/*
119	 * Secondly, test that a 'comm' event can be found when the event is
120	 * disabled with the dummy event still enabled.
121	 */
122
123	perf_evlist__enable(evlist);
124
125	evsel = perf_evlist__last(evlist);
126
127	CHECK__(perf_evlist__disable_event(evlist, evsel));
128
129	comm = "Test COMM 2";
130	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
131
132	perf_evlist__disable(evlist);
133
134	found = find_comm(evlist, comm);
135	if (found != 1) {
136		pr_debug("Seconf time, failed to find tracking event.\n");
137		goto out_err;
138	}
139
140	err = 0;
141
142out_err:
143	if (evlist) {
144		perf_evlist__disable(evlist);
145		perf_evlist__delete(evlist);
146	} else {
147		cpu_map__delete(cpus);
148		thread_map__delete(threads);
149	}
150
151	return err;
152}