linux-kernel - Re: [PATCH] Add an offset in the cyc2ns computation to fix sched

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Date:	Fri, 16 Mar 2007 19:22:12 +0100
From:	Andi Kleen <ak@...e.de>
To:	"Guillaume Chazarain" <guichaz@...il.com>
Cc:	"john stultz" <johnstul@...ibm.com>, mathieu.desnoyers@...ymtl.ca,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add an offset in the cyc2ns computation to fix sched_clock jumps

On Friday 16 March 2007 19:14, Guillaume Chazarain wrote:
> Hello,
> 
> The scheduling problems I reported in the thread:
> http://lkml.org/lkml/2007/3/3/128
> are caused by the set_cyc2ns_scale() function called when the CPU speed changes.
> Changing the scale causes a warp in the value returned by sched_clock().

I already fixed this myself in a similar way (but didn't push it out yet) 

But for .21 I ended up deciding on your revert patch, even though it will give bad
performance.

-Andi

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