linux-kernel - Re: CONFIG_NO_HZ breaks blktrace timestamps

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Message-id: <1200066205.7480.8.camel@lap75545.ornl.gov>
Date:	Fri, 11 Jan 2008 10:43:25 -0500
From:	David Dillow <dillowda@...l.gov>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, linux-btrace@...r.kernel.org,
	mingo@...hat.com, tglx@...utronix.de,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: CONFIG_NO_HZ breaks blktrace timestamps


On Fri, 2008-01-11 at 10:34 +0100, Ingo Molnar wrote:
> * David Dillow <dillowda@...l.gov> wrote:
> 
> > Ingo, Thomas added as I think this is related to 
> > sched.c:__update_rq_clock()'s checking for forward time warps.
> 
> yep, we've got some fixes in this area. Do blktrace timestamps work fine 
> in v2.6.23, with NOHZ?

Do you still want this tested, given that your ktime change works? If
so, it will likely be next week before I can devote some cycles to it --
it'll take installing a new distro on the machines.
-- 
Dave Dillow
National Center for Computational Science
Oak Ridge National Laboratory
(865) 241-6602 office


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