linux-kernel - Re: Dropping CONFIG_REORDER on x86-64 for 2.6.22

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Message-ID: <20070419170650.GI10338@stusta.de>
Date:	Thu, 19 Apr 2007 19:06:50 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Andi Kleen <ak@...e.de>
Cc:	discuss@...-64.org, linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: Dropping CONFIG_REORDER on x86-64 for 2.6.22

On Thu, Apr 19, 2007 at 01:54:52PM +0200, Andi Kleen wrote:
> 
> Hallo,
> 
> I'm thinking about dropping the x86-64 CONFIG_REORDER for 2.6.22. 
> The function enabled -ffunction-sections and then tries to reorder
> the executable
> 
> While that's in theory a worthy goal to save TLB/icache, in practice it 
> didn't really work out.
> 
> Rationale:
>...
> So I'm planning to drop the option and arch/x86_64/kernel/functionlist
> 
> Comments?

Have there been any benchmarks showing performance improvements 
with -ffunction-sections?

> -Andi

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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