linux-kernel - Re: [PATCH 2/2] i386: sched_clock() follows percpu frequency changes

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Date:	Sat, 12 May 2007 12:25:40 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	johnstul@...ibm.com, mingo@...e.hu, Jiri Bohac <jbohac@...e.cz>
Subject: Re: [PATCH 2/2] i386: sched_clock() follows percpu frequency
	changes

On Sat, 2007-05-12 at 20:58 +0200, Andi Kleen wrote:
> On Saturday 12 May 2007 17:43:46 Daniel Walker wrote:
> > Considering that Andi has a similar patch, I'm going to assume there
> > is already justification for this..
> 
> I just have a patch for sched_clock, which is somewhat different.
> 
> > What it ends up doing is allows the TSC to be used in cases which
> > we didn't use it before, and hope it's still mostly accurate.
> 
> Yes the current code is badly broken in this regard. e.g. i always
> hated that it always falls back on powernow systems.
> 
> Jiri will hopefully repost his true per CPU TSC patch soon, that should
> make it all obsolete.

All I could find on LKML from Jiri was an x86_64 specific gettimeofday
implementation .. Do you have a reference to the first post of the per
cpu tsc patch?

Daniel

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