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

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Date:	Sat, 7 Jul 2007 02:10:08 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Dave Jones <davej@...hat.com>, Chuck Ebbert <cebbert@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Alexey Dobriyan <adobriyan@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 10/10] Scheduler profiling - Use immediate values

On Fri, Jul 06, 2007 at 07:38:27PM -0400, Dave Jones wrote:
> On Sat, Jul 07, 2007 at 01:28:43AM +0200, Adrian Bunk wrote:
> 
>  > Only if you want to squeeze the last bit of performance out of
>  > _debugging_ functionality.
>  > 
>  > You avoid all the pain if you simply don't use debugging functionality 
>  > on production systems.
> 
> I think you're mixing up profiling and debugging.   The former is
> extremely valuable under production systems.

profiling = debugging of performance problems

My words were perhaps a bit sloppy, but profiling isn't part of normal 
operation and if people use a separate kernel for such purposes we don't 
need infrastructure for reducing performance penalties of enabled debug 
options.

> 	Dave

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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