linux-kernel - Re: [PATCH 1/2] perf tools: Add reference timestamp to perf header

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Message-ID: <1292262433.6803.351.camel@twins>
Date:	Mon, 13 Dec 2010 18:47:13 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	"David S. Ahern" <daahern@...co.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf tools: Add reference timestamp to perf header

On Mon, 2010-12-13 at 18:35 +0100, Peter Zijlstra wrote:
>         * this CLOCK_MONOTONIC offset (for what little good that does, since
> our clock isn't strictly sync'ed to CLOCK_MONOTONIC so we can incur
> arbitrary drift). 

In fact, the only sane way to do that is by creating a software counter
that represents CLOCK_MONOTONIC and sample that say once a minute (or
more often if you want smaller drift).


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