Re: [PATCH 07/13] perf evlist: Fix creation of cpu map
From: David Ahern
Date: Thu Apr 26 2012 - 17:23:00 EST
On 4/26/12 3:12 PM, Namhyung Kim wrote:
Hmm.. No, I can reproduce it without any of this series. And now I think
that it is not related to the number of cpus. On my 4 core (no
hyperthreading) machine at home, the result was same.
BTW, did you change sysctl settings?
$ cat /sys/devices/system/cpu/online
0-3
$ grep . /proc/sys/kernel/perf_event_*
/proc/sys/kernel/perf_event_max_sample_rate:100000
/proc/sys/kernel/perf_event_mlock_kb:516
/proc/sys/kernel/perf_event_paranoid:1
$ grep . /proc/sys/kernel/perf_event_*
/proc/sys/kernel/perf_event_max_sample_rate:100000
/proc/sys/kernel/perf_event_mlock_kb:516
/proc/sys/kernel/perf_event_paranoid:-1
That last one is the key. I have it set to not paranoid and usually run
perf a non-root user.
$ ./perf test 7
7: Validate PERF_RECORD_* events& perf_sample fields: FAILED!
$ ./perf --version
perf version 3.4.rc1
running 3.4-rc4 kernel + perf from tip/perf/core branch.
David
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