linux-kernel - RE: [PATCH] i386 add idle notifier (take 2)

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Message-ID: <EB12A50964762B4D8111D55B764A8454FE4AFD@scsmsx413.amr.corp.intel.com>
Date:	Mon, 11 Dec 2006 14:40:43 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	<eranian@....hp.com>, <linux-kernel@...r.kernel.org>
Cc:	<akpm@...l.org>, <ak@...e.de>
Subject: RE: [PATCH] i386 add idle notifier (take 2)



Stephane,

This patch has the same race as in 64 bit patch, that was fixed here
http://www.ussg.iu.edu/hypermail/linux/kernel/0611.3/1264.html

With that race, idle callbacks does not work correctly. Even on a
totally idle system, I can see exit_idle called before enter_idle once
every few seconds. Can you update this patch with similar changes as in
64 bit part in the above patch.

Thanks,
Venki 

>-----Original Message-----
>From: linux-kernel-owner@...r.kernel.org 
>[mailto:linux-kernel-owner@...r.kernel.org] On Behalf Of 
>Stephane Eranian
>Sent: Wednesday, November 29, 2006 8:41 AM
>To: linux-kernel@...r.kernel.org
>Cc: akpm@...l.org; ak@...e.de; Stephane Eranian
>Subject: Re: [PATCH] i386 add idle notifier (take 2)
>
>Hello,
>
>[This is the second take due to stray '}' in the patch. Sorry 
>about that]
>
>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.
>
>changelog:
>	- add an idle notifier mechanism to i386 tree
>
>signed-off-by: stephane eranian <eranain@....hp.com>
>
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