[v15,3/8] perf tests: Add testcase for auxiliary evlist

Message ID 1468219875-243457-4-git-send-email-wangnan0@huawei.com
State New
Headers show

Commit Message

Wang Nan July 11, 2016, 6:51 a.m.
Improve test backward-ring-buffer, trace both enter and exit event of
prctl() syscall, utilize auxiliary evlist to mmap enter and exit event
into separated mmaps.

Signed-off-by: Wang Nan <wangnan0@huawei.com>

Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
---
 tools/perf/tests/backward-ring-buffer.c | 103 ++++++++++++++++++++++++++------
 1 file changed, 84 insertions(+), 19 deletions(-)

-- 
1.8.3.4

Patch

diff --git a/tools/perf/tests/backward-ring-buffer.c b/tools/perf/tests/backward-ring-buffer.c
index 1750ef2..2e66c48 100644
--- a/tools/perf/tests/backward-ring-buffer.c
+++ b/tools/perf/tests/backward-ring-buffer.c
@@ -23,16 +23,34 @@  static void testcase(void)
 	}
 }
 
+static void perf_evlist__mmap_read_catchup_all(struct perf_evlist *evlist)
+{
+	int i;
+
+	for (i = 0; i < evlist->nr_mmaps; i++)
+		perf_evlist__mmap_read_catchup(evlist, i);
+}
+
 static int count_samples(struct perf_evlist *evlist, int *sample_count,
 			 int *comm_count)
 {
 	int i;
+	union perf_event *(*reader)(struct perf_evlist *, int);
+
+	if (evlist->backward)
+		reader = perf_evlist__mmap_read_backward;
+	else
+		reader = perf_evlist__mmap_read_forward;
 
 	for (i = 0; i < evlist->nr_mmaps; i++) {
 		union perf_event *event;
 
-		perf_evlist__mmap_read_catchup(evlist, i);
-		while ((event = perf_evlist__mmap_read_backward(evlist, i)) != NULL) {
+		/*
+		 * Before calling count_samples(), ring buffers in backward
+		 * evlist should have catched up with newest record
+		 * using perf_evlist__mmap_read_catchup_all().
+		 */
+		while ((event = (*reader)(evlist, i)) != NULL) {
 			const u32 type = event->header.type;
 
 			switch (type) {
@@ -51,34 +69,57 @@  static int count_samples(struct perf_evlist *evlist, int *sample_count,
 	return TEST_OK;
 }
 
-static int do_test(struct perf_evlist *evlist, int mmap_pages,
-		   int *sample_count, int *comm_count)
+struct test_result {
+	int sys_enter;
+	int sys_exit;
+	int comm;
+};
+
+static int do_test(struct perf_evlist *evlist,
+		   struct perf_evlist *aux_evlist,
+		   int mmap_pages,
+		   struct test_result *res)
 {
 	int err;
 	char sbuf[STRERR_BUFSIZE];
 
-	err = perf_evlist__mmap(evlist, mmap_pages, true);
+	err = perf_evlist__mmap(evlist, mmap_pages, false);
 	if (err < 0) {
 		pr_debug("perf_evlist__mmap: %s\n",
 			 strerror_r(errno, sbuf, sizeof(sbuf)));
 		return TEST_FAIL;
 	}
 
+	err = perf_evlist__mmap(aux_evlist, mmap_pages, true);
+	if (err < 0) {
+		pr_debug("perf_evlist__mmap for aux_evlist: %s\n",
+			 strerror_r(errno, sbuf, sizeof(sbuf)));
+		return TEST_FAIL;
+	}
+
 	perf_evlist__enable(evlist);
 	testcase();
 	perf_evlist__disable(evlist);
 
-	err = count_samples(evlist, sample_count, comm_count);
+	perf_evlist__mmap_read_catchup_all(aux_evlist);
+	err = count_samples(aux_evlist, &res->sys_exit, &res->comm);
+	if (err)
+		goto errout;
+	err = count_samples(evlist, &res->sys_enter, &res->comm);
+	if (err)
+		goto errout;
+errout:
 	perf_evlist__munmap(evlist);
+	perf_evlist__munmap(aux_evlist);
 	return err;
 }
 
 
 int test__backward_ring_buffer(int subtest __maybe_unused)
 {
-	int ret = TEST_SKIP, err, sample_count = 0, comm_count = 0;
+	int ret = TEST_SKIP, err;
 	char pid[16], sbuf[STRERR_BUFSIZE];
-	struct perf_evlist *evlist;
+	struct perf_evlist *evlist, *aux_evlist = NULL;
 	struct perf_evsel *evsel __maybe_unused;
 	struct parse_events_error parse_error;
 	struct record_opts opts = {
@@ -90,6 +131,7 @@  int test__backward_ring_buffer(int subtest __maybe_unused)
 		.mmap_pages   = 256,
 		.default_interval = 1,
 	};
+	struct test_result res = {0, 0, 0};
 
 	snprintf(pid, sizeof(pid), "%d", getpid());
 	pid[sizeof(pid) - 1] = '\0';
@@ -101,7 +143,6 @@  int test__backward_ring_buffer(int subtest __maybe_unused)
 		return TEST_FAIL;
 	}
 
-	evlist->backward = true;
 	err = perf_evlist__create_maps(evlist, &opts.target);
 	if (err < 0) {
 		pr_debug("Not enough memory to create thread/cpu maps\n");
@@ -116,11 +157,21 @@  int test__backward_ring_buffer(int subtest __maybe_unused)
 		goto out_delete_evlist;
 	}
 
-	perf_evlist__config(evlist, &opts, NULL);
+	/*
+	 * Set backward bit, ring buffer should be writing from end. Record
+	 * it in aux evlist
+	 */
+	perf_evlist__last(evlist)->attr.write_backward = 1;
+
+	err = parse_events(evlist, "syscalls:sys_exit_prctl", &parse_error);
+	if (err) {
+		pr_debug("Failed to parse tracepoint event, try use root\n");
+		ret = TEST_SKIP;
+		goto out_delete_evlist;
+	}
+	/* Don't set backward bit for exit event. Record it in main evlist */
 
-	/* Set backward bit, ring buffer should be writing from end */
-	evlist__for_each_entry(evlist, evsel)
-		evsel->attr.write_backward = 1;
+	perf_evlist__config(evlist, &opts, NULL);
 
 	err = perf_evlist__open(evlist);
 	if (err < 0) {
@@ -129,24 +180,38 @@  int test__backward_ring_buffer(int subtest __maybe_unused)
 		goto out_delete_evlist;
 	}
 
+	aux_evlist = perf_evlist__new_aux(evlist);
+	if (!aux_evlist) {
+		pr_debug("perf_evlist__new_aux failed\n");
+		goto out_delete_evlist;
+	}
+	aux_evlist->backward = true;
+
 	ret = TEST_FAIL;
-	err = do_test(evlist, opts.mmap_pages, &sample_count,
-		      &comm_count);
+	err = do_test(evlist, aux_evlist, opts.mmap_pages, &res);
 	if (err != TEST_OK)
 		goto out_delete_evlist;
 
-	if ((sample_count != NR_ITERS) || (comm_count != NR_ITERS)) {
-		pr_err("Unexpected counter: sample_count=%d, comm_count=%d\n",
-		       sample_count, comm_count);
+	if (res.sys_enter != res.sys_exit) {
+		pr_err("Unexpected counter: sys_enter count=%d, sys_exit count=%d\n",
+		       res.sys_enter, res.sys_exit);
+		goto out_delete_evlist;
+	}
+
+	if ((res.sys_exit != NR_ITERS) || (res.comm != NR_ITERS)) {
+		pr_err("Unexpected counter: sys_exit count=%d, comm count=%d\n",
+		       res.sys_exit, res.comm);
 		goto out_delete_evlist;
 	}
 
-	err = do_test(evlist, 1, &sample_count, &comm_count);
+	err = do_test(evlist, aux_evlist, 1, &res);
 	if (err != TEST_OK)
 		goto out_delete_evlist;
 
 	ret = TEST_OK;
 out_delete_evlist:
+	if (aux_evlist)
+		perf_evlist__delete(aux_evlist);
 	perf_evlist__delete(evlist);
 	return ret;
 }