linux-kernel - Re: [patch] tlb flush_data: replace per

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Message-ID: <496BCB60.6040504@zytor.com>
Date:	Mon, 12 Jan 2009 14:59:44 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andi Kleen <andi@...stfloor.org>,
	Frederik Deweerdt <frederik.deweerdt@...og.eu>,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [patch] tlb flush_data: replace per_cpu with an array

Ingo Molnar wrote:

>> Nope it doesn't save memory on most systems because per cpu is only 
>> allocated based on the CPUs that are actually there. And if you have 
>> more than 8 cores you can likely afford a few bytes per CPU.
> 
> No distro kernel will build with less than 8 CPUs anyway so this point is 
> moot.

Except for embedded, which will build for exactly what's in the box.

	-hpa
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