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

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Date:	Tue, 13 Jan 2009 13:14:26 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Mike Travis <travis@....com>,
	Frederik Deweerdt <frederik.deweerdt@...og.eu>,
	tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org
Subject: Re: [patch] tlb flush_data: replace per_cpu with an array


* Andi Kleen <andi@...stfloor.org> wrote:

> > > (And was it determined yet, that a cacheline has to be tossed around 
> > > as well?)
> > 
> > No, that assertion of Andi is wrong.
> 
> For the IPI you always have to toss one cache line around to pass the 
> information.
> 
> Anyways the padding is just to avoid false sharing.

Which is a red herring - the padding was there before the patch, and is 
there after the patch as well.

	Ingo
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