linux-kernel - Re: [PATCH] scheduler: fix x86 regression in native_sched

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Date:	Fri, 7 Dec 2007 18:57:54 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Guillaume Chazarain <guichaz@...oo.fr>
Cc:	stefano.brivio@...imi.it, Nick Piggin <nickpiggin@...oo.com.au>,
	Robert Love <rml@...h9.net>, linux-kernel@...r.kernel.org,
	Dave Jones <davej@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Michael Buesch <mb@...sch.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH] scheduler: fix x86 regression in native_sched_clock


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

> Le Fri, 7 Dec 2007 15:54:18 +0100,
> Ingo Molnar <mingo@...e.hu> a écrit :
> 
> > This is a version that 
> > is supposed fix all known aspects of TSC and frequency-change 
> > weirdnesses.
> 
> Tested it with frequency changes, the clock is as smooth as I like it
> :-)

ok, great :-)

> The only remaining sched_clock user in need of conversion seems to be 
> lockdep.

yeah - for CONFIG_LOCKSTAT - but that needs to be done even more 
carefully, due to rq->lock being lockdep-checked. We can perhaps try a 
lock-less cpu_clock() version - other CPUs are not supposed to update 
rq->clock.

> Great work.

thanks. I do get the impression that most of this can/should wait until 
2.6.25. The patches look quite dangerous.

	Ingo
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