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;
+}