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

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Message-Id: <1228464216.18899.18.camel@twins>
Date:	Fri, 05 Dec 2008 09:03:36 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Ingo Molnar <mingo@...e.hu>, 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>,
	Arjan van de Veen <arjan@...radead.org>,
	Peter Anvin <hpa@...or.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [patch 0/3] [Announcement] Performance Counters for Linux

On Fri, 2008-12-05 at 18:57 +1100, Paul Mackerras wrote:
> Peter Zijlstra writes:
> 
> > So, while most people would not consider two consecutive read() ops to
> > be close or near the same time, due to preemption and such, that is
> > taken away by the fact that the counters are task local time based - so
> > preemption doesn't affect thing. Right?
> 
> I'm sorry, I don't follow the argument here.  What do you mean by
> "task local time based"?

time only flows when the task is running.


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