forked from luck/tmp_suning_uos_patched
perf tests: Use lower sample_freq in sw clock event period test
We were using it at 10 kHz, which doesn't work in machines where somehow the max freq was auto reduced by the kernel: [root@ssdandy ~]# perf test 19 19: Test software clock events have valid period values : FAILED! [root@ssdandy ~]# perf test -v 19 19: Test software clock events have valid period values : --- start --- Couldn't open evlist: Invalid argument ---- end ---- Test software clock events have valid period values: FAILED! [root@ssdandy ~]# [root@ssdandy ~]# cat /proc/sys/kernel/perf_event_max_sample_rate 7000 Reducing it to 500 Hz should be good enough for this test and also shouldn't affect what it is testing. But warn the user if it fails, informing the knob and the freq tried. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-548rhj1uo6xbwnxa95kw3hqe@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -34,7 +34,7 @@ static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
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.freq = 1,
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.freq = 1,
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};
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};
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attr.sample_freq = 10000;
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attr.sample_freq = 500;
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evlist = perf_evlist__new();
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evlist = perf_evlist__new();
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if (evlist == NULL) {
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if (evlist == NULL) {
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@ -58,8 +58,11 @@ static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
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}
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}
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if (perf_evlist__open(evlist)) {
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if (perf_evlist__open(evlist)) {
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const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
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err = -errno;
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err = -errno;
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pr_debug("Couldn't open evlist: %s\n", strerror(errno));
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pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
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strerror(errno), knob, (u64)attr.sample_freq);
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goto out_delete_maps;
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goto out_delete_maps;
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}
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}
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