linux-kernel - Re: [RFC] perf/perf_events: misleading number of samples due to mmap()

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Message-ID: <1276699962.1745.599.camel@laptop>
Date:	Wed, 16 Jun 2010 16:52:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com
Subject: Re: [RFC] perf/perf_events: misleading number of samples due to
 mmap()

On Wed, 2010-06-16 at 16:40 +0200, Stephane Eranian wrote:
> This leads me to another point. For per-thread sampling, why
> do we need to record mmap() events happening *outside* of
> the process? I can understand the exception of kernel modules. 

How does that happen? The per-thread events should be on the per-task
context, so another task's mmap() events should never end up there.
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