linux-kernel - Re: [patch 0/3] [Announcement] Performance Counters for Linux

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Message-ID: <20081204230206.6e083d51@infradead.org>
Date:	Thu, 4 Dec 2008 23:02:06 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephane Eranian <eranian@...glemail.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Robert Richter <robert.richter@....com>,
	Peter Anvin <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [patch 0/3] [Announcement] Performance Counters for Linux

On Fri, 5 Dec 2008 07:31:31 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> Btw., i'm curious, why would we want to do that? It skews the results
> if the task continues executing and counters stop. To get the highest 
> quality profiling output the counters should follow the true state of
> the task that is profiled - and events should be passed to the
> monitoring task asynchronously. The _events_ can contain precise
> coupled information 
> - but the counters should continue.

btw stopping the task on counter overflow is an issue for things that
want to self profile, like JITs


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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