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Date: Sat, 31 Aug 2013 21:50:53 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
David Ahern <dsahern@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
Namhyung Kim <namhyung@...il.com>,
Paul Mackerras <paulus@...ba.org>,
Stephane Eranian <eranian@...gle.com>
Subject: [PATCH V2 3/3] perf tools: add 'keep tracking' test
Add a test for the newly added PERF_COUNT_SW_DUMMY event.
The test checks that tracking events continue when an
event is disabled but a dummy software event is not
disabled.
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
tools/perf/Makefile | 1 +
tools/perf/tests/builtin-test.c | 4 +
tools/perf/tests/keep-tracking.c | 154 +++++++++++++++++++++++++++++++++++++++
tools/perf/tests/tests.h | 1 +
tools/perf/util/evlist.c | 42 ++++++++++-
tools/perf/util/evlist.h | 5 ++
6 files changed, 205 insertions(+), 2 deletions(-)
create mode 100644 tools/perf/tests/keep-tracking.c
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index ecebfd0..c5dc1ad 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -465,6 +465,7 @@ endif # NO_LIBELF
ifndef NO_LIBUNWIND
LIB_OBJS += $(OUTPUT)util/unwind.o
endif
+LIB_OBJS += $(OUTPUT)tests/keep-tracking.o
ifndef NO_LIBAUDIT
BUILTIN_OBJS += $(OUTPUT)builtin-trace.o
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 8ad9415..8bbeba3 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -108,6 +108,10 @@ static struct test {
.func = test__sample_parsing,
},
{
+ .desc = "Test using a dummy software event to keep tracking",
+ .func = test__keep_tracking,
+ },
+ {
.func = NULL,
},
};
diff --git a/tools/perf/tests/keep-tracking.c b/tools/perf/tests/keep-tracking.c
new file mode 100644
index 0000000..d444ea2
--- /dev/null
+++ b/tools/perf/tests/keep-tracking.c
@@ -0,0 +1,154 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+
+#include "parse-events.h"
+#include "evlist.h"
+#include "evsel.h"
+#include "thread_map.h"
+#include "cpumap.h"
+#include "tests.h"
+
+#define CHECK__(x) { \
+ while ((x) < 0) { \
+ pr_debug(#x " failed!\n"); \
+ goto out_err; \
+ } \
+}
+
+#define CHECK_NOT_NULL__(x) { \
+ while ((x) == NULL) { \
+ pr_debug(#x " failed!\n"); \
+ goto out_err; \
+ } \
+}
+
+static int find_comm(struct perf_evlist *evlist, const char *comm)
+{
+ union perf_event *event;
+ int i, found;
+
+ found = 0;
+ for (i = 0; i < evlist->nr_mmaps; i++) {
+ while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
+ if (event->header.type == PERF_RECORD_COMM &&
+ (pid_t)event->comm.pid == getpid() &&
+ (pid_t)event->comm.tid == getpid() &&
+ strcmp(event->comm.comm, comm) == 0)
+ found += 1;
+ }
+ }
+ return found;
+}
+
+/**
+ * test__keep_tracking - test using a dummy software event to keep tracking.
+ *
+ * This function implements a test that checks that tracking events continue
+ * when an event is disabled but a dummy software event is not disabled. If the
+ * test passes %0 is returned, otherwise %-1 is returned.
+ */
+int test__keep_tracking(void)
+{
+ struct perf_record_opts opts = {
+ .mmap_pages = UINT_MAX,
+ .user_freq = UINT_MAX,
+ .user_interval = ULLONG_MAX,
+ .freq = 4000,
+ .target = {
+ .uses_mmap = true,
+ },
+ };
+ struct thread_map *threads = NULL;
+ struct cpu_map *cpus = NULL;
+ struct perf_evlist *evlist = NULL;
+ struct perf_evsel *evsel = NULL;
+ int found, err = -1;
+ const char *comm;
+
+ threads = thread_map__new(-1, getpid(), UINT_MAX);
+ CHECK_NOT_NULL__(threads);
+
+ cpus = cpu_map__new(NULL);
+ CHECK_NOT_NULL__(cpus);
+
+ evlist = perf_evlist__new();
+ CHECK_NOT_NULL__(evlist);
+
+ perf_evlist__set_maps(evlist, cpus, threads);
+
+ CHECK__(parse_events(evlist, "dummy:u"));
+ CHECK__(parse_events(evlist, "cycles:u"));
+
+ perf_evlist__config(evlist, &opts);
+
+ evsel = perf_evlist__first(evlist);
+
+ evsel->attr.comm = 1;
+ evsel->attr.disabled = 1;
+ evsel->attr.enable_on_exec = 0;
+
+ if (perf_evlist__open(evlist) < 0) {
+ fprintf(stderr, " (not supported)");
+ err = 0;
+ goto out_err;
+ }
+
+ CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));
+
+ /*
+ * First, test that a 'comm' event can be found when the event is
+ * enabled.
+ */
+
+ perf_evlist__enable(evlist);
+
+ comm = "Test COMM 1";
+ CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
+
+ perf_evlist__disable(evlist);
+
+ found = find_comm(evlist, comm);
+ if (found != 1) {
+ pr_debug("First time, failed to find tracking event.\n");
+ goto out_err;
+ }
+
+ /*
+ * Secondly, test that a 'comm' event can be found when the event is
+ * disabled with the dummy event still enabled.
+ */
+
+ perf_evlist__enable(evlist);
+
+ evsel = perf_evlist__last(evlist);
+
+ CHECK__(perf_evlist__disable_event(evlist, evsel));
+
+ comm = "Test COMM 2";
+ CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
+
+ perf_evlist__disable(evlist);
+
+ found = find_comm(evlist, comm);
+ if (found != 1) {
+ pr_debug("Seconf time, failed to find tracking event.\n");
+ goto out_err;
+ }
+
+ err = 0;
+
+out_err:
+ if (evlist) {
+ perf_evlist__disable(evlist);
+ perf_evlist__munmap(evlist);
+ perf_evlist__close(evlist);
+ perf_evlist__delete(evlist);
+ }
+ if (cpus)
+ cpu_map__delete(cpus);
+ if (threads)
+ thread_map__delete(threads);
+
+ return err;
+}
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 83d5b71..c048b58 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -38,5 +38,6 @@ int test__sw_clock_freq(void);
int test__perf_time_to_tsc(void);
int test__code_reading(void);
int test__sample_parsing(void);
+int test__keep_tracking(void);
#endif /* TESTS_H */
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 5df4ca9..b8727ae 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -246,7 +246,7 @@ void perf_evlist__disable(struct perf_evlist *evlist)
for (cpu = 0; cpu < nr_cpus; cpu++) {
list_for_each_entry(pos, &evlist->entries, node) {
- if (!perf_evsel__is_group_leader(pos))
+ if (!perf_evsel__is_group_leader(pos) || !pos->fd)
continue;
for (thread = 0; thread < nr_threads; thread++)
ioctl(FD(pos, cpu, thread),
@@ -264,7 +264,7 @@ void perf_evlist__enable(struct perf_evlist *evlist)
for (cpu = 0; cpu < nr_cpus; cpu++) {
list_for_each_entry(pos, &evlist->entries, node) {
- if (!perf_evsel__is_group_leader(pos))
+ if (!perf_evsel__is_group_leader(pos) || !pos->fd)
continue;
for (thread = 0; thread < nr_threads; thread++)
ioctl(FD(pos, cpu, thread),
@@ -273,6 +273,44 @@ void perf_evlist__enable(struct perf_evlist *evlist)
}
}
+int perf_evlist__disable_event(struct perf_evlist *evlist,
+ struct perf_evsel *evsel)
+{
+ int cpu, thread, err;
+
+ if (!evsel->fd)
+ return 0;
+
+ for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
+ for (thread = 0; thread < evlist->threads->nr; thread++) {
+ err = ioctl(FD(evsel, cpu, thread),
+ PERF_EVENT_IOC_DISABLE, 0);
+ if (err)
+ return err;
+ }
+ }
+ return 0;
+}
+
+int perf_evlist__enable_event(struct perf_evlist *evlist,
+ struct perf_evsel *evsel)
+{
+ int cpu, thread, err;
+
+ if (!evsel->fd)
+ return -EINVAL;
+
+ for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
+ for (thread = 0; thread < evlist->threads->nr; thread++) {
+ err = ioctl(FD(evsel, cpu, thread),
+ PERF_EVENT_IOC_ENABLE, 0);
+ if (err)
+ return err;
+ }
+ }
+ return 0;
+}
+
static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
{
int nr_cpus = cpu_map__nr(evlist->cpus);
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 841a394..880d713 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -110,6 +110,11 @@ void perf_evlist__munmap(struct perf_evlist *evlist);
void perf_evlist__disable(struct perf_evlist *evlist);
void perf_evlist__enable(struct perf_evlist *evlist);
+int perf_evlist__disable_event(struct perf_evlist *evlist,
+ struct perf_evsel *evsel);
+int perf_evlist__enable_event(struct perf_evlist *evlist,
+ struct perf_evsel *evsel);
+
void perf_evlist__set_selected(struct perf_evlist *evlist,
struct perf_evsel *evsel);
--
1.7.11.7
--
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