linux-kernel - Re: [PATCH] i386 add idle notifier

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Message-ID: <20061129170939.GA29203@infradead.org>
Date:	Wed, 29 Nov 2006 17:09:39 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Stephane Eranian <eranian@....hp.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, ak@...e.de
Subject: Re: [PATCH] i386 add idle notifier

On Wed, Nov 29, 2006 at 08:25:40AM -0800, Stephane Eranian wrote:
> Hello,
> 
> Here is a patch that adds an idle notifier to the i386 tree.
> The idle notifier functionalities and implementation are
> identical to the x86_64 idle notifier. We use the idle notifier
> in the context of perfmon.
> 
> The patch is against Andi Kleen's x86_64-2.6.19-rc6-061128-1.bz2
> kernel. It may apply to other kernels but it needs some updates
> to poll_idle() and default_idle() to work correctly.

Walking through a notifier chain on every single interrupt (including
timer interrupts) seems rather costly.  What do you need this for
exactly?

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