From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>,
linux-kernel@vger.kernel.org, mingo@elte.hu, paulus@samba.org,
davem@davemloft.net, fweisbec@gmail.com,
perfmon2-devel@lists.sf.net, eranian@gmail.com
Subject: Re: [RFC] perf/perf_events: misleading number of samples due to mmap()
Date: Wed, 16 Jun 2010 16:54:12 +0200 [thread overview]
Message-ID: <1276700052.1745.600.camel@laptop> (raw)
In-Reply-To: <AANLkTikvExLi_MahU3kkX1TQKvBODq8SyTSXgpyAjOay@mail.gmail.com>
On Wed, 2010-06-16 at 16:40 +0200, Stephane Eranian wrote:
> The reason is that perf reports an estimate based on the
> number of bytes written to the buffer divided by the minimal
> sample size of 24 bytes.
Right, we should change that based on the PERF_SAMPLE flags used. It
will remain an estimate due to the out of band events, but it should be
closer than assuming the minimal sample size.
prev parent reply other threads:[~2010-06-16 14:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-16 14:40 [RFC] perf/perf_events: misleading number of samples due to mmap() Stephane Eranian
2010-06-16 14:52 ` Peter Zijlstra
2010-06-16 16:41 ` stephane eranian
2010-06-16 17:15 ` stephane eranian
2010-06-16 17:43 ` Peter Zijlstra
2010-06-16 14:54 ` Peter Zijlstra [this message]
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