linux-kernel - Re: CONFIG_NO_HZ breaks blktrace timestamps

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Message-ID: <478736C6.3080802@suspend2.net>
Date:	Fri, 11 Jan 2008 20:28:38 +1100
From:	nigel@...pend2.net
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	David Dillow <dillowda@...l.gov>,
	Guillaume Chazarain <guichaz@...oo.fr>,
	linux-kernel@...r.kernel.org, linux-btrace@...r.kernel.org,
	mingo@...hat.com, tglx@...utronix.de
Subject: Re: CONFIG_NO_HZ breaks blktrace timestamps

Hi.

Jens Axboe wrote:
> On Thu, Jan 10 2008, David Dillow wrote:
>> On Thu, 2008-01-10 at 23:44 +0100, Guillaume Chazarain wrote:
>>> David Dillow <dillowda@...l.gov> wrote:
>>>
>>>> At the moment, I'm not sure how to track this farther, or how to fix it
>>>> properly. Any advice would be appreciated.
>>> Just out of curiosity, could you try the appended cumulative patch and
>>> report .clock_warps, .clock_overflows and .clock_underflows as you did.
>> With those patches, CONFIG_NO_HZ works just fine.

Could these patches also help with hibernation issues? I'm trying
x86_64+NO_HZ, and seeing activity delayed during the atomic copy and
afterwards until I manually generate interrupts (by pressing keys).

Regards,

Nigel

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