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Date:	Fri, 7 Dec 2007 18:57:54 +0100
From:	Ingo Molnar <>
To:	Guillaume Chazarain <>
Cc:, Nick Piggin <>,
	Robert Love <>,,
	Dave Jones <>,
	"Rafael J. Wysocki" <>, Michael Buesch <>,
	Thomas Gleixner <>,
	Andrew Morton <>,
	Len Brown <>
Subject: Re: [PATCH] scheduler: fix x86 regression in native_sched_clock

* Guillaume Chazarain <> wrote:

> Le Fri, 7 Dec 2007 15:54:18 +0100,
> Ingo Molnar <> 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 

> Great work.

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

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