linux-kernel - Re: [patch] Performance Counters for Linux, v2

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Message-ID: <87a5b0800812090846h396523a0kdb2d1ca4b4781851@mail.gmail.com>
Date:	Tue, 9 Dec 2008 16:46:27 +0000
From:	"Will Newton" <will.newton@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	eranian@...il.com, linux-kernel@...r.kernel.org,
	"Thomas Gleixner" <tglx@...utronix.de>, linux-arch@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Eric Dumazet" <dada1@...mosbay.com>,
	"Robert Richter" <robert.richter@....com>,
	"Arjan van de Veen" <arjan@...radead.org>,
	"Peter Anvin" <hpa@...or.com>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	"David Miller" <davem@...emloft.net>,
	"Paul Mackerras" <paulus@...ba.org>,
	"Paolo Ciarrocchi" <paolo.ciarrocchi@...il.com>
Subject: Re: [patch] Performance Counters for Linux, v2

On Tue, Dec 9, 2008 at 1:46 PM, Ingo Molnar <mingo@...e.hu> wrote:

> Firstly, sampling "at 1msec intervals" or any fixed period is a _very_
> wrong mindset - and cross-sampling counters is a similarly wrong mindset.

If your hardware does not interrupt on overflow I don't think you have
any choice in the matter. I know such hardware is less than ideal but
it exists so it should be supported.
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