linux/tools/perf/arch/x86/tests
Arnaldo Carvalho de Melo 4f4ba0e6af perf tests: No need to set attr.sample_freq in the perf time to TSC test
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.

In this test we only look at the PERF_SAMPLE_TIME fields in PERF_RECORD_
meta events, no need to set sample_freq.

Thanks to Namhyung for suggesting that max_sample_rate could be the
reason for the test failure, seeing the 'perf test -vv' output I sent.

Before:

  # echo 1000 > /proc/sys/kernel/perf_event_max_sample_rate
  # perf test TSC
  45: Test converting perf time to TSC   : FAILED!

After:

  # perf test TSC
  45: Test converting perf time to TSC   : Ok
  # cat /proc/sys/kernel/perf_event_max_sample_rate
  1000

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-lcob05qhawkuvsyuu9g1fld5@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-01-07 11:26:54 -03:00
..
arch-tests.c perf tests: Add Intel CQM test 2015-10-05 16:56:07 -03:00
Build perf tests: Add Intel CQM test 2015-10-05 16:56:07 -03:00
dwarf-unwind.c perf tests: Move x86 tests into arch directory 2015-10-05 16:55:43 -03:00
gen-insn-x86-dat.awk perf tests: Move x86 tests into arch directory 2015-10-05 16:55:43 -03:00
gen-insn-x86-dat.sh perf tests: Move x86 tests into arch directory 2015-10-05 16:55:43 -03:00
insn-x86-dat-32.c perf tests: Move x86 tests into arch directory 2015-10-05 16:55:43 -03:00
insn-x86-dat-64.c perf tests: Move x86 tests into arch directory 2015-10-05 16:55:43 -03:00
insn-x86-dat-src.c perf tests: Move x86 tests into arch directory 2015-10-05 16:55:43 -03:00
insn-x86.c perf tests: Pass the subtest index to each test routine 2015-11-19 13:19:15 -03:00
intel-cqm.c perf tests: Pass the subtest index to each test routine 2015-11-19 13:19:15 -03:00
perf-time-to-tsc.c perf tests: No need to set attr.sample_freq in the perf time to TSC test 2016-01-07 11:26:54 -03:00
rdpmc.c perf tests: Pass the subtest index to each test routine 2015-11-19 13:19:15 -03:00
regs_load.S perf x86: Fix perf to use non-executable stack, again 2014-04-30 17:02:30 +02:00