linux-kernel - Re: [patch 4/8] Immediate Value

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Message-ID: <20070716004102.GD26411@Krystal>
Date:	Sun, 15 Jul 2007 20:41:02 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Alexey Dobriyan <adobriyan@...il.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Adrian Bunk <bunk@...sta.de>
Subject: Re: [patch 4/8] Immediate Value - Add kconfig menus

* Andi Kleen (andi@...stfloor.org) wrote:
> > On embedded systems, the tradeoff is not the same. The immediate values
> > trade a little bit of system memory (to keep the pointers to the
> > variable and instruction as well as the size of the variable, only used
> > when the variable is updated) in order to remove cache line hot paths.
> 
> Please remove the Kconfig. I don't think it makes sense. Such optimizations
> should be always enabled. We don't have CONFIG_GO_FASTER configs normally.
> Don't introduce them now.
> 
> > 
> > Also, embedded systems with physically read-only memory clearly does not
> > want to enable this.
> 
> We always patch the x86 kernel, so they have to deal with it anyways.
> The x86 port doesn't support XIP.
> 
> -Andi

Hehe, good timing, please see the
immediate-values-kconfig-embedded.patch I just sent. ;) Well, the idea
is to give the option to every architecture in the embedded menu, which
is not limited to X86.

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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