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

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Message-ID: <20090113033608.GN23848@one.firstfloor.org>
Date:	Tue, 13 Jan 2009 04:36:08 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Travis <travis@....com>,
	Frederik Deweerdt <frederik.deweerdt@...og.eu>,
	andi@...stfloor.org, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] tlb flush_data: replace per_cpu with an array

> > (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.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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