From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Jiri Olsa <jolsa@redhat.com>
Cc: linux-kernel@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Ingo Molnar <mingo@elte.hu>, Paul Mackerras <paulus@samba.org>,
Corey Ashford <cjashfor@linux.vnet.ibm.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Namhyung Kim <namhyung@kernel.org>
Subject: Re: [PATCH 02/11] perf: Do not get values from disabled counters in group format read
Date: Wed, 24 Oct 2012 14:32:22 +0200 [thread overview]
Message-ID: <1351081942.23337.1.camel@twins> (raw)
In-Reply-To: <20121024121406.GA5582@krava.brq.redhat.com>
On Wed, 2012-10-24 at 14:14 +0200, Jiri Olsa wrote:
>
> well, x86_pmu_read calls x86_perf_event_update, which expects the
> event
> is active.. if it's not it'll update the count from whatever left in
> event.hw.idx counter.. could be uninitialized or used by others..
>
Oh right, we shouldn't call ->read() unless ->state ==
PERF_EVENT_STATE_ACTIVE. Aside from that, perf_event_count() should
return the 'right' value regardless state (although excluding ERROR
might make sense).
next prev parent reply other threads:[~2012-10-24 12:33 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-20 14:33 [PATCH 00/11] perf tool: Add PERF_SAMPLE_READ sample read support Jiri Olsa
2012-10-20 14:33 ` [PATCH 01/11] perf: Add PERF_EVENT_IOC_ID ioctl to return event ID Jiri Olsa
2012-10-20 14:33 ` [PATCH 02/11] perf: Do not get values from disabled counters in group format read Jiri Olsa
2012-10-23 16:13 ` Peter Zijlstra
2012-10-23 16:50 ` Jiri Olsa
2012-10-24 12:01 ` Peter Zijlstra
2012-10-24 12:14 ` Jiri Olsa
2012-10-24 12:32 ` Peter Zijlstra [this message]
2012-10-24 16:03 ` Jiri Olsa
2012-10-20 14:33 ` [PATCH 03/11] perf tool: Use PERF_EVENT_IOC_ID perf ioctl to read event id Jiri Olsa
2012-10-22 7:57 ` Namhyung Kim
2012-10-22 8:40 ` Jiri Olsa
2012-10-20 14:33 ` [PATCH 04/11] perf tool: Add support for parsing PERF_SAMPLE_READ sample type Jiri Olsa
2012-10-22 8:56 ` Namhyung Kim
2012-10-20 14:33 ` [PATCH 05/11] perf tool: Fix event ID retrieval for group format read case Jiri Olsa
2012-10-20 14:33 ` [PATCH 06/11] perf tool: Add perf_evlist__id2sid function to get event ID related data Jiri Olsa
2012-10-20 14:33 ` [PATCH 07/11] perf tool: Add PERF_SAMPLE_READ sample related processing Jiri Olsa
2012-10-20 14:33 ` [PATCH 08/11] perf tool: Add 'S' event/group modifier to read sample value Jiri Olsa
2012-10-20 14:33 ` [PATCH 09/11] perf test: Add parse events tests for leader sampling Jiri Olsa
2012-10-22 8:58 ` Namhyung Kim
2012-10-22 9:12 ` Jiri Olsa
2012-10-20 14:33 ` [PATCH 10/11] perf tool: Display period values for all group members Jiri Olsa
2012-10-20 14:33 ` [PATCH 11/11] perf record: Fix mmap error output condition Jiri Olsa
2012-10-30 12:11 ` [tip:perf/core] " tip-bot for Jiri Olsa
2012-10-21 16:38 ` [PATCH 00/11] perf tool: Add PERF_SAMPLE_READ sample read support Ingo Molnar
2012-10-22 8:09 ` Jiri Olsa
2012-10-22 8:51 ` Namhyung Kim
2012-10-22 9:15 ` Jiri Olsa
2012-10-22 7:32 ` Namhyung Kim
2012-10-22 7:53 ` Jiri Olsa
2012-10-22 8:53 ` Namhyung Kim
2012-10-22 9:06 ` Jiri Olsa
2012-10-26 1:29 ` Namhyung Kim
2012-10-26 9:14 ` Peter Zijlstra
2012-10-26 10:23 ` Jiri Olsa
2012-10-26 15:39 ` Namhyung Kim
2012-10-26 16:14 ` David Ahern
2012-10-26 16:25 ` Namhyung Kim
2012-10-26 16:47 ` David Ahern
2012-10-26 17:00 ` Arnaldo Carvalho de Melo
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