linux-kernel - Re: [PATCH -cfs] Fix cpu

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Message-ID: <20070619090120.GC5746@elte.hu>
Date:	Tue, 19 Jun 2007 11:01:20 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	dmitry.adamushko@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -cfs] Fix cpu_load calculation error


* Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com> wrote:

> Ingo/Dmitry,
> 	I am resending the patch to fix cpu_load calculation error in 
> cfs v17, this time CCing lkml.

> v17 cpu_load calculation didn't take into account that a class's 
> delta_exec/fair may be stale because it could not get an opportunity 
> to run. This can lead to incorrect calculation of a class's load. This 
> patch removes load tracking from individual classes and instead 
> introduces a global per-cpu load tracking common to all classes in 
> kernel/sched.c itself.
> 
> Thanks to Dmitry for suggesting this idea.
> 
> Signed-off-by : Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>

thanks Srivatsa, i've applied this to the -v18 tree and everything's 
looking good so far!

	Ingo
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