To: linux-kernel@vger.kernel.org
From: Frederik Himpe <fhimpe@telenet.be>
Subject: Re: [PATCH v2] Fix hardware IRQ time accounting problem.
Date: Wed, 5 Dec 2007 11:39:25 +0000 (UTC)
Message-ID: <fj62ld$6eo$1@ger.gmane.org>
References: <20071204055144.GR24243@bakeyournoodle.com>
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Cc: linuxppc-dev@ozlabs.org, linux-usb-devel@lists.sourceforge.net
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On Tue, 04 Dec 2007 16:51:44 +1100, Tony Breeds wrote:

> The commit fa13a5a1f25f671d084d8884be96fc48d9b68275 (sched: restore
> deterministic CPU accounting on powerpc), unconditionally calls
> update_process_tick() in system context.  In the deterministic
> accounting case this is the correct thing to do.  However, in the
> non-deterministic accounting case we need to not do this, and results in
> the time accounted as hardware irq time being artificially elevated.
> 
> Also this patch collapses 2 consecutive '#ifdef
> CONFIG_VIRT_CPU_ACCOUNTING' checks in time.h into one for neatness.

I can confirm this patch fixed the problem for me. Thank you!

-- 
Frederik Himpe


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