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

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Message-ID: <20080111105059.GB1589@elte.hu>
Date:	Fri, 11 Jan 2008 11:50:59 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Guillaume Chazarain <guichaz@...oo.fr>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	David Dillow <dillowda@...l.gov>, linux-kernel@...r.kernel.org,
	linux-btrace@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de
Subject: Re: [patch] block: fix blktrace timestamps


* Guillaume Chazarain <guichaz@...oo.fr> wrote:

> > Correction: it was not a high res time source, it was "the 
> > scheduler's per-cpu, non-exported, non-coherent, 
> > warps-and-jumps-like-hell high-res timesource that was intentionally 
> > called the _sched_ clock" ;-)
> 
> I think the warts of cpu_clock() are fixable, except maybe 
> unsynchronization on SMP which is harder.

yes - but in terms of v2.6.24, the bkltrace patch i sent is a lot less 
risky.

	Ingo
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