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-rw-r--r--tools/perf/tests/sw-clock.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/tools/perf/tests/sw-clock.c b/tools/perf/tests/sw-clock.c
index ed777728dfe7..93a7139ff5f7 100644
--- a/tools/perf/tests/sw-clock.c
+++ b/tools/perf/tests/sw-clock.c
@@ -34,7 +34,7 @@ static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
.freq = 1,
};
- attr.sample_freq = 10000;
+ attr.sample_freq = 500;
evlist = perf_evlist__new();
if (evlist == NULL) {
@@ -58,8 +58,11 @@ static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
}
if (perf_evlist__open(evlist)) {
+ const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
+
err = -errno;
- pr_debug("Couldn't open evlist: %s\n", strerror(errno));
+ pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
+ strerror(errno), knob, (u64)attr.sample_freq);
goto out_delete_maps;
}