From 239849dde350c9f7356974ca4f62171f50a2c86e Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Thu, 7 Jan 2016 16:51:58 -0300 Subject: [PATCH] perf tests: No need to set attr.sample_freq for tracking !PERF_RECORD_SAMPLE We were asking for a 4kHz sample_freq, making the test fail needlessly when the system reduced /proc/sys/kernel/perf_event_max_sample_rate below that. Before: # perf test -vv dummy 23: Test using a dummy software event to keep tracking : --- start --- test child forked, pid 32421 ------------------------------------------------------------ perf_event_attr: type 1 size 112 config 0x9 { sample_period, sample_freq } 4000 sample_type IP|TID|ID|PERIOD sys_perf_event_open failed, error -22 Unable to open dummy and cycles event test child finished with -2 ---- end ---- Test using a dummy software event to keep tracking: Skip # [root@zoo ~]# cat /proc/sys/kernel/perf_event_max_sample_rate 1000 After: [root@zoo ~]# perf test dummy 23: Test using a dummy software event to keep tracking : Ok Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-487iquegrs2379e5n0pi0tcp@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/tests/keep-tracking.c | 1 - 1 file changed, 1 deletion(-) diff --git a/tools/perf/tests/keep-tracking.c b/tools/perf/tests/keep-tracking.c index a337a6da1f39..615813278334 100644 --- a/tools/perf/tests/keep-tracking.c +++ b/tools/perf/tests/keep-tracking.c @@ -55,7 +55,6 @@ int test__keep_tracking(int subtest __maybe_unused) .mmap_pages = UINT_MAX, .user_freq = UINT_MAX, .user_interval = ULLONG_MAX, - .freq = 4000, .target = { .uses_mmap = true, },