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author | Ramkumar Ramachandra <artagnon@gmail.com> | 2013-09-30 07:13:05 -0400 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-10-11 11:17:33 -0400 |
commit | c458fe62ca31496664c1211a7906d261220b18f9 (patch) | |
tree | 93ae1d9609c7f06dd18299f9114e638e29b640f5 /samples | |
parent | 820042233bd3c1b24b5ca4c75a88a4e0de39814a (diff) |
perf stat: Don't print bogus data on -e cycles
When only the cycles event is requested:
$ perf stat -e cycles dd if=/dev/zero of=/dev/null count=1000000
1000000+0 records in
1000000+0 records out
512000000 bytes (512 MB) copied, 0.26123 s, 2.0 GB/s
Performance counter stats for 'dd if=/dev/zero of=/dev/null count=1000000':
911,626,453 cycles # 0.000 GHz
0.262113350 seconds time elapsed
The 0.000 GHz comment in the output is totally bogus and misleading. It
happens because update_shadow_stats() doesn't touch runtime_nsecs_stats;
it is only written when a requested counter matches a SW_TASK_CLOCK. In
our case, since we have only requested HW_CPU_CYCLES,
runtime_nsecs_stats is unavailable. So, omit printing the comment
altogether.
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1380539585-23859-3-git-send-email-artagnon@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'samples')
0 files changed, 0 insertions, 0 deletions