perf tests: Add test to check for event times

This test creates software event 'cpu-clock' attaches it in several ways
and checks that enabled and running times match.

Committer notes:

Testing it:

  [acme@jouet linux]$ perf test -v times
  44: Test events times                                        :
  --- start ---
  test child forked, pid 27170
  attaching to spawned child, enable on exec
    OK    : ena 307328, run 307328
  attaching to current thread as enabled
    OK    : ena 7826, run 7826
  attaching to current thread as disabled
    OK    : ena 738, run 738
  attaching to CPU 0 as enabled
    SKIP  : not enough rights
  attaching to CPU 0 as enabled
    SKIP  : not enough rights
  test child finished with -2
  ---- end ----
  Test events times: Skip
  [acme@jouet linux]$

  [root@jouet ~]# perf test times
  44: Test events times                                        : Ok
  [root@jouet ~]# perf test -v times
  44: Test events times                                        :
  --- start ---
  test child forked, pid 27306
  attaching to spawned child, enable on exec
    OK    : ena 479290, run 479290
  attaching to current thread as enabled
    OK    : ena 11356, run 11356
  attaching to current thread as disabled
    OK    : ena 987, run 987
  attaching to CPU 0 as enabled
    OK    : ena 3717, run 3717
  attaching to CPU 0 as enabled
    OK    : ena 2323, run 2323
  test child finished with 0
  ---- end ----
  Test events times: Ok
  [root@jouet ~]#

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1458823940-24583-7-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 242 insertions, 0 deletions

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 1ba628ed049a..449fe97a555f 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -37,6 +37,7 @@ perf-y += topology.o
 perf-y += cpumap.o
 perf-y += stat.o
 perf-y += event_update.o
+perf-y += event-times.o
 
 $(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build
         $(call rule_mkdir)
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index f2b1dcac45d3..93c467015e71 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -204,6 +204,10 @@ static struct test generic_tests[] = {
                 .func = test__event_update,
         },
         {
+                .desc = "Test events times",
+                .func = test__event_times,
+        },
+        {
                 .func = NULL,
         },
 };
diff --git a/tools/perf/tests/event-times.c b/tools/perf/tests/event-times.c
new file mode 100644
index 000000000000..95fb744f6628
--- /dev/null
+++ b/tools/perf/tests/event-times.c
@@ -0,0 +1,236 @@
+#include <linux/compiler.h>
+#include <string.h>
+#include "tests.h"
+#include "evlist.h"
+#include "evsel.h"
+#include "util.h"
+#include "debug.h"
+#include "thread_map.h"
+#include "target.h"
+
+static int attach__enable_on_exec(struct perf_evlist *evlist)
+{
+        struct perf_evsel *evsel = perf_evlist__last(evlist);
+        struct target target = {
+                .uid = UINT_MAX,
+        };
+        const char *argv[] = { "true", NULL, };
+        char sbuf[STRERR_BUFSIZE];
+        int err;
+
+        pr_debug("attaching to spawned child, enable on exec\n");
+
+        err = perf_evlist__create_maps(evlist, &target);
+        if (err < 0) {
+                pr_debug("Not enough memory to create thread/cpu maps\n");
+                return err;
+        }
+
+        err = perf_evlist__prepare_workload(evlist, &target, argv, false, NULL);
+        if (err < 0) {
+                pr_debug("Couldn't run the workload!\n");
+                return err;
+        }
+
+        evsel->attr.enable_on_exec = 1;
+
+        err = perf_evlist__open(evlist);
+        if (err < 0) {
+                pr_debug("perf_evlist__open: %s\n",
+                         strerror_r(errno, sbuf, sizeof(sbuf)));
+                return err;
+        }
+
+        return perf_evlist__start_workload(evlist) == 1 ? TEST_OK : TEST_FAIL;
+}
+
+static int detach__enable_on_exec(struct perf_evlist *evlist)
+{
+        waitpid(evlist->workload.pid, NULL, 0);
+        return 0;
+}
+
+static int attach__current_disabled(struct perf_evlist *evlist)
+{
+        struct perf_evsel *evsel = perf_evlist__last(evlist);
+        struct thread_map *threads;
+        int err;
+
+        pr_debug("attaching to current thread as disabled\n");
+
+        threads = thread_map__new(-1, getpid(), UINT_MAX);
+        if (threads == NULL) {
+                pr_debug("thread_map__new\n");
+                return -1;
+        }
+
+        evsel->attr.disabled = 1;
+
+        err = perf_evsel__open_per_thread(evsel, threads);
+        if (err) {
+                pr_debug("Failed to open event cpu-clock:u\n");
+                return err;
+        }
+
+        thread_map__put(threads);
+        return perf_evsel__enable(evsel) == 0 ? TEST_OK : TEST_FAIL;
+}
+
+static int attach__current_enabled(struct perf_evlist *evlist)
+{
+        struct perf_evsel *evsel = perf_evlist__last(evlist);
+        struct thread_map *threads;
+        int err;
+
+        pr_debug("attaching to current thread as enabled\n");
+
+        threads = thread_map__new(-1, getpid(), UINT_MAX);
+        if (threads == NULL) {
+                pr_debug("failed to call thread_map__new\n");
+                return -1;
+        }
+
+        err = perf_evsel__open_per_thread(evsel, threads);
+
+        thread_map__put(threads);
+        return err == 0 ? TEST_OK : TEST_FAIL;
+}
+
+static int detach__disable(struct perf_evlist *evlist)
+{
+        struct perf_evsel *evsel = perf_evlist__last(evlist);
+
+        return perf_evsel__enable(evsel);
+}
+
+static int attach__cpu_disabled(struct perf_evlist *evlist)
+{
+        struct perf_evsel *evsel = perf_evlist__last(evlist);
+        struct cpu_map *cpus;
+        int err;
+
+        pr_debug("attaching to CPU 0 as enabled\n");
+
+        cpus = cpu_map__new("0");
+        if (cpus == NULL) {
+                pr_debug("failed to call cpu_map__new\n");
+                return -1;
+        }
+
+        evsel->attr.disabled = 1;
+
+        err = perf_evsel__open_per_cpu(evsel, cpus);
+        if (err) {
+                if (err == -EACCES)
+                        return TEST_SKIP;
+
+                pr_debug("Failed to open event cpu-clock:u\n");
+                return err;
+        }
+
+        cpu_map__put(cpus);
+        return perf_evsel__enable(evsel);
+}
+
+static int attach__cpu_enabled(struct perf_evlist *evlist)
+{
+        struct perf_evsel *evsel = perf_evlist__last(evlist);
+        struct cpu_map *cpus;
+        int err;
+
+        pr_debug("attaching to CPU 0 as enabled\n");
+
+        cpus = cpu_map__new("0");
+        if (cpus == NULL) {
+                pr_debug("failed to call cpu_map__new\n");
+                return -1;
+        }
+
+        err = perf_evsel__open_per_cpu(evsel, cpus);
+        if (err == -EACCES)
+                return TEST_SKIP;
+
+        cpu_map__put(cpus);
+        return err ? TEST_FAIL : TEST_OK;
+}
+
+static int test_times(int (attach)(struct perf_evlist *),
+                      int (detach)(struct perf_evlist *))
+{
+        struct perf_counts_values count;
+        struct perf_evlist *evlist = NULL;
+        struct perf_evsel *evsel;
+        int err = -1, i;
+
+        evlist = perf_evlist__new();
+        if (!evlist) {
+                pr_debug("failed to create event list\n");
+                goto out_err;
+        }
+
+        err = parse_events(evlist, "cpu-clock:u", NULL);
+        if (err) {
+                pr_debug("failed to parse event cpu-clock:u\n");
+                goto out_err;
+        }
+
+        evsel = perf_evlist__last(evlist);
+        evsel->attr.read_format |=
+                PERF_FORMAT_TOTAL_TIME_ENABLED |
+                PERF_FORMAT_TOTAL_TIME_RUNNING;
+
+        err = attach(evlist);
+        if (err == TEST_SKIP) {
+                pr_debug("  SKIP  : not enough rights\n");
+                return err;
+        }
+
+        TEST_ASSERT_VAL("failed to attach", !err);
+
+        for (i = 0; i < 100000000; i++) { }
+
+        TEST_ASSERT_VAL("failed to detach", !detach(evlist));
+
+        perf_evsel__read(evsel, 0, 0, &count);
+
+        err = !(count.ena == count.run);
+
+        pr_debug("  %s: ena %" PRIu64", run %" PRIu64"\n",
+                 !err ? "OK    " : "FAILED",
+                 count.ena, count.run);
+
+out_err:
+        if (evlist)
+                perf_evlist__delete(evlist);
+        return !err ? TEST_OK : TEST_FAIL;
+}
+
+/*
+ * This test creates software event 'cpu-clock'
+ * attaches it in several ways (explained below)
+ * and checks that enabled and running times
+ * match.
+ */
+int test__event_times(int subtest __maybe_unused)
+{
+        int err, ret = 0;
+
+#define _T(attach, detach)                      \
+        err = test_times(attach, detach);       \
+        if (err && (ret == TEST_OK || ret == TEST_SKIP))        \
+                ret = err;
+
+        /* attach on newly spawned process after exec */
+        _T(attach__enable_on_exec,   detach__enable_on_exec)
+        /* attach on current process as enabled */
+        _T(attach__current_enabled,  detach__disable)
+        /* attach on current process as disabled */
+        _T(attach__current_disabled, detach__disable)
+        /* attach on cpu as disabled */
+        _T(attach__cpu_disabled,     detach__disable)
+        /* attach on cpu as enabled */
+        _T(attach__cpu_enabled,      detach__disable)
+
+#undef _T
+        return ret;
+}
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 82b2b5e6ba7c..0fc946989cf0 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -85,6 +85,7 @@ int test__synthesize_stat_config(int subtest);
 int test__synthesize_stat(int subtest);
 int test__synthesize_stat_round(int subtest);
 int test__event_update(int subtest);
+int test__event_times(int subtest);
 
 #if defined(__arm__) || defined(__aarch64__)
 #ifdef HAVE_DWARF_UNWIND_SUPPORT