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

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Message-Id: <E1I6TAl-0002iC-W7@be1.lrz>
Date:	Thu, 05 Jul 2007 17:23:11 +0200
From:	Bodo Eggert <7eggert@....de>
To:	Andi Kleen <andi@...stfloor.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	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

Andi Kleen <andi@...stfloor.org> wrote:
> 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

IMO you should combine them. For distibutions, it may be good to include
profiling support unconditionally, but how many of the vanilla kernel users
are going to use profiling at all?
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