linux-kernel - Re: [PATCH] perf_events: fix time tracking in samples

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Date:	Wed, 20 Oct 2010 15:04:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	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,
	robert.richter@....com
Subject: Re: [PATCH] perf_events: fix time tracking in samples

On Wed, 2010-10-20 at 14:42 +0200, Stephane Eranian wrote:
> It may be better to try another approach just for PERF_SAMPLE_READ
> with its own version of ctx->time. What about if on event_sched_in() you
> were snapshotting  ctx->time. Then in the perf_output_read_event(), you'd
> have to compute the time delta and add it to this private version of
> ctx->time and store that in the sample. 

Right, that might work.
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