]> git.karo-electronics.de Git - linux-beck.git/commit
perf tests: Use lower sample_freq in sw clock event period test
authorArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 11 Nov 2013 19:33:18 +0000 (16:33 -0300)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 11 Nov 2013 19:43:34 +0000 (16:43 -0300)
commit67c1e4a53b17894e6a24f95057cc374c4be051cb
tree92d167206d7638d48b129444d00e9919cf203c71
parentd0b849e9bced36cf279881294c07c43b0b9dce86
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>
tools/perf/tests/sw-clock.c