linux-kernel - Re: [patch 10/10] Scheduler profiling

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Message-ID: <p73bqer3i73.fsf@bingen.suse.de>
Date:	05 Jul 2007 00:41:36 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 10/10] Scheduler profiling - Use immediate values

Alexey Dobriyan <adobriyan@...il.com> writes:

> On Tue, Jul 03, 2007 at 12:40:56PM -0400, Mathieu Desnoyers wrote:
> > Use immediate values with lower d-cache hit in optimized version as a
> > condition for scheduler profiling call.
> 
> I think it's better to put profile.c under CONFIG_PROFILING as
> _expected_, so CONFIG_PROFILING=n users won't get any overhead, immediate or
> not. That's what I'm going to do after test-booting bunch of kernels.

No, it's better to handle this efficiently at runtime e.g. for 
distribution kernels. Mathieu's patch is good

-Andi
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