From: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
To: Namhyung Kim <namhyung.kim@lge.com>
Cc: David Ahern <dsahern@gmail.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@redhat.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 07/13] perf evlist: Fix creation of cpu map
Date: Fri, 27 Apr 2012 12:08:21 -0300 [thread overview]
Message-ID: <20120427150821.GA27997@infradead.org> (raw)
In-Reply-To: <87397qhvvx.fsf@sejong.aot.lge.com>
Em Fri, Apr 27, 2012 at 09:16:18AM +0900, Namhyung Kim escreveu:
> Hi,
>
> On Thu, 26 Apr 2012 15:22:55 -0600, David Ahern wrote:
> > 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.
> >
>
> That's exactly what I want to see :). On perf_mmap() we have:
>
> if ((locked > lock_limit) && perf_paranoid_tracepoint_raw() &&
> !capable(CAP_IPC_LOCK)) {
> ret = -EPERM;
> goto unlock;
> }
>
> So as long as you set perf_event_paranoid to -1 or run perf test as
> root, you cannot see the failure.
Ok, after this discussion, David, can I have your acked-by or tested-by?
- Arnaldo
next prev parent reply other threads:[~2012-04-27 15:08 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-26 5:15 [RFC PATCHSET 00/13] perf tools: Fix cpu/thread map handling v2 Namhyung Kim
2012-04-26 5:15 ` [PATCH 01/13] perf tools: Introduce struct perf_target Namhyung Kim
2012-05-11 6:27 ` [tip:perf/core] " tip-bot for Namhyung Kim
2012-04-26 5:15 ` [PATCH 02/13] perf stat: Convert to " Namhyung Kim
2012-05-11 6:28 ` [tip:perf/core] " tip-bot for Namhyung Kim
2012-04-26 5:15 ` [PATCH 03/13] perf top: " Namhyung Kim
2012-05-11 6:29 ` [tip:perf/core] " tip-bot for Namhyung Kim
2012-04-26 5:15 ` [PATCH 04/13] perf tools: Introduce perf_target__validate() helper Namhyung Kim
2012-05-11 6:30 ` [tip:perf/core] " tip-bot for Namhyung Kim
2012-04-26 5:15 ` [PATCH 05/13] perf tools: Make perf_evlist__create_maps() take struct perf_target Namhyung Kim
2012-05-11 6:31 ` [tip:perf/core] perf evlist: Make create_maps() " tip-bot for Namhyung Kim
2012-04-26 5:15 ` [PATCH 06/13] perf tools: Check more combinations of PID/TID, UID and CPU switches Namhyung Kim
2012-05-11 6:32 ` [tip:perf/core] " tip-bot for Namhyung Kim
2012-04-26 5:15 ` [PATCH 07/13] perf evlist: Fix creation of cpu map Namhyung Kim
2012-04-26 15:05 ` David Ahern
2012-04-26 21:12 ` Namhyung Kim
2012-04-26 21:22 ` David Ahern
2012-04-27 0:16 ` Namhyung Kim
2012-04-27 15:08 ` Arnaldo Carvalho de Melo [this message]
2012-04-27 15:32 ` David Ahern
2012-04-27 16:00 ` Arnaldo Carvalho de Melo
2012-04-27 16:05 ` David Ahern
2012-04-27 16:09 ` Arnaldo Carvalho de Melo
2012-05-02 18:40 ` Arnaldo Carvalho de Melo
2012-05-04 4:05 ` Namhyung Kim
2012-05-04 13:37 ` Arnaldo Carvalho de Melo
2012-05-04 13:53 ` Namhyung Kim
2012-04-26 5:15 ` [PATCH 08/13] perf target: Split out perf_target handling code Namhyung Kim
2012-05-02 18:30 ` Arnaldo Carvalho de Melo
2012-05-03 14:39 ` Namhyung Kim
2012-05-03 15:27 ` Arnaldo Carvalho de Melo
2012-05-03 15:30 ` Namhyung Kim
2012-05-11 6:33 ` [tip:perf/core] " tip-bot for Namhyung Kim
2012-04-26 5:15 ` [PATCH 09/13] perf target: Introduce perf_target_errno Namhyung Kim
2012-05-02 18:59 ` Arnaldo Carvalho de Melo
2012-05-03 14:47 ` Namhyung Kim
2012-05-03 20:34 ` David Ahern
2012-05-03 20:42 ` Arnaldo Carvalho de Melo
2012-05-03 20:49 ` David Ahern
2012-04-26 5:15 ` [PATCH 10/13] perf target: Introduce perf_target__parse_uid() Namhyung Kim
2012-04-26 5:15 ` [PATCH 11/13] perf tools: Introduce perf_target__strerror() Namhyung Kim
2012-04-26 5:15 ` [PATCH 12/13] perf target: Consolidate target task/cpu checking Namhyung Kim
2012-04-26 5:15 ` [PATCH 13/13] perf stat: Use perf_evlist__create_maps Namhyung Kim
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