linux-kernel - Re: [patch] block: fix blktrace timestamps

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Message-ID: <20080114084231.GQ6258@kernel.dk>
Date:	Mon, 14 Jan 2008 09:42:32 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, 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,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch] block: fix blktrace timestamps

On Mon, Jan 14 2008, Christoph Hellwig wrote:
> 
> Folks, this is getting a little silly.

It is

> Even if CONFIG_NO_HZ is new this is a an important regression, and
> yes we should avoid regressions wherever we can, and for such a quite
> important feature we should fix it.  On the other hand blktrace is using
> the wrong interface, and it has been told multiple times on lkml that
> sched_clock() should never ever be used outside the scheduler.  So the
> burden to fix this regression lies on the shoulders of the blktrace
> maintainer.

That is true. So far alternatives have all been slower though, so not
very tempting to transition to.

> No need for silly name calling here.

I don't know what thread you are reading, but neiter Ingo nor I have
resorted to silly name calling. The thread has long since diverted from
the original topic, though.

-- 
Jens Axboe

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