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

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Date:	Mon, 16 Jul 2007 02:33:22 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Alexey Dobriyan <adobriyan@...il.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Adrian Bunk <bunk@...sta.de>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [patch 4/8] Immediate Value - Add kconfig menus

> 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
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