linux-kernel - Re: perf: counter and event question

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Message-ID: <1261999573.7135.83.camel@laptop>
Date:	Mon, 28 Dec 2009 12:26:13 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tim Blechmann <tim@...ngt.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: perf: counter and event question

On Mon, 2009-12-28 at 12:16 +0100, Tim Blechmann wrote:
> like it is impossible to sample instructions with a period of 1? 

Pretty much, imagine the cpu getting a trap every cycle.

In order to avoid the machine grinding to a halt, we've implemented a
throttle which defaults to 100k samples/s, anything over that will be
discarted.

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