Date: Tue, 13 Jan 2009 13:14:26 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Andi Kleen <andi@firstfloor.org>
Cc: Mike Travis <travis@sgi.com>,
       Frederik Deweerdt <frederik.deweerdt@xprog.eu>, tglx@linutronix.de,
       hpa@zytor.com, linux-kernel@vger.kernel.org
Subject: Re: [patch] tlb flush_data: replace per_cpu with an array
Message-ID: <20090113121426.GA29149@elte.hu>
References: <20090112213539.GA10720@gambetta> <496BCA21.2010709@sgi.com> <20090112235156.GC10720@gambetta> <496BD8FB.1050101@sgi.com> <20090113000112.GA10368@elte.hu> <20090113033608.GN23848@one.firstfloor.org>
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* Andi Kleen <andi@firstfloor.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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