linux-kernel - Re: CONFIG_NO_HZ breaks blktrace timestamps

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Date:	Fri, 11 Jan 2008 23:30:25 +0100
From:	Guillaume Chazarain <guichaz@...oo.fr>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	David Dillow <dillowda@...l.gov>, linux-kernel@...r.kernel.org,
	linux-btrace@...r.kernel.org, tglx@...utronix.de,
	Jens Axboe <jens.axboe@...cle.com>, nigel@...pend2.net
Subject: Re: CONFIG_NO_HZ breaks blktrace timestamps

Ingo Molnar <mingo@...e.hu> wrote:

> ok. I have applied all but this one

Hmm, I couldn't find them in mingo/linux-2.6-sched-devel.git.

> i think it's much simpler to do what i have below. Could you try it on 
> your box? Or if it is using ACPI idle - in that case the callbacks 
> should already be there and there should be no need for further fixups.
> 
> Subject: x86: idle wakeup event in the HLT loop

I use ACPI, so this patch has no effect.

FYI, I'm currently trying to track down where rq->clock started to
overflow with nohz=off, and it seems to be before 2.6.23, so my patches
are not at fault ;-) Or maybe I am dreaming and it was always
overflowing. Investigating ...

-- 
Guillaume
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