perf test: Add entry to test cpu topology

This patch test cpu core_id and socket_id which are stored in perf_env.

Commiter note:

  # perf test topo
  40: Test topology in session: Ok

  # perf test -v topo
  40: Test topology in session:
  --- start ---
  test child forked, pid 31767
  templ file: /tmp/perf-test-VTZ1PL
  CPU 0, core 0, socket 0
  CPU 1, core 1, socket 0
  CPU 2, core 0, socket 0
  CPU 3, core 1, socket 0
  test child finished with 0
  ---- end ----
  Test topology in session: Ok
  #

Based-on-a-patch-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Kan Liang <kan.liang@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/1441357111-64522-1-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 115 insertions, 0 deletions

diff --git a/tools/perf/tests/topology.c b/tools/perf/tests/topology.c
new file mode 100644
index 000000000000..c3aff53a976a
--- /dev/null
+++ b/tools/perf/tests/topology.c
@@ -0,0 +1,115 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "tests.h"
+#include "util.h"
+#include "session.h"
+#include "evlist.h"
+#include "debug.h"
+
+#define TEMPL "/tmp/perf-test-XXXXXX"
+#define DATA_SIZE	10
+
+static int get_temp(char *path)
+{
+	int fd;
+
+	strcpy(path, TEMPL);
+
+	fd = mkstemp(path);
+	if (fd < 0) {
+		perror("mkstemp failed");
+		return -1;
+	}
+
+	close(fd);
+	return 0;
+}
+
+static int session_write_header(char *path)
+{
+	struct perf_session *session;
+	struct perf_data_file file = {
+		.path = path,
+		.mode = PERF_DATA_MODE_WRITE,
+	};
+
+	session = perf_session__new(&file, false, NULL);
+	TEST_ASSERT_VAL("can't get session", session);
+
+	session->evlist = perf_evlist__new_default();
+	TEST_ASSERT_VAL("can't get evlist", session->evlist);
+
+	perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY);
+	perf_header__set_feat(&session->header, HEADER_NRCPUS);
+
+	session->header.data_size += DATA_SIZE;
+
+	TEST_ASSERT_VAL("failed to write header",
+			!perf_session__write_header(session, session->evlist, file.fd, true));
+
+	perf_session__delete(session);
+
+	return 0;
+}
+
+static int check_cpu_topology(char *path, struct cpu_map *map)
+{
+	struct perf_session *session;
+	struct perf_data_file file = {
+		.path = path,
+		.mode = PERF_DATA_MODE_READ,
+	};
+	int i;
+
+	session = perf_session__new(&file, false, NULL);
+	TEST_ASSERT_VAL("can't get session", session);
+
+	for (i = 0; i < session->header.env.nr_cpus_online; i++) {
+		pr_debug("CPU %d, core %d, socket %d\n", i,
+			 session->header.env.cpu[i].core_id,
+			 session->header.env.cpu[i].socket_id);
+	}
+
+	for (i = 0; i < map->nr; i++) {
+		TEST_ASSERT_VAL("Core ID doesn't match",
+			(session->header.env.cpu[map->map[i]].core_id == (cpu_map__get_core(map, i) & 0xffff)));
+
+		TEST_ASSERT_VAL("Socket ID doesn't match",
+			(session->header.env.cpu[map->map[i]].socket_id == cpu_map__get_socket(map, i)));
+	}
+
+	perf_session__delete(session);
+
+	return 0;
+}
+
+int test_session_topology(void)
+{
+	char path[PATH_MAX];
+	struct cpu_map *map;
+	int ret = -1;
+
+	TEST_ASSERT_VAL("can't get templ file", !get_temp(path));
+
+	pr_debug("templ file: %s\n", path);
+
+	if (session_write_header(path))
+		goto free_path;
+
+	map = cpu_map__new(NULL);
+	if (map == NULL) {
+		pr_debug("failed to get system cpumap\n");
+		goto free_path;
+	}
+
+	if (check_cpu_topology(path, map))
+		goto free_map;
+	ret = 0;
+
+free_map:
+	cpu_map__put(map);
+free_path:
+	unlink(path);
+	return ret;
+}