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
Date: Tue, 13 Jan 2009 13:14:26 +0100 [thread overview]
Message-ID: <20090113121426.GA29149@elte.hu> (raw)
In-Reply-To: <20090113033608.GN23848@one.firstfloor.org>
* 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
prev parent reply other threads:[~2009-01-13 12:14 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-12 21:35 [patch] tlb flush_data: replace per_cpu with an array Frederik Deweerdt
2009-01-12 21:46 ` Ingo Molnar
2009-01-12 21:57 ` Andi Kleen
2009-01-12 22:10 ` Frederik Deweerdt
2009-01-12 22:32 ` Andi Kleen
2009-01-12 22:50 ` Ingo Molnar
2009-01-12 22:40 ` Ingo Molnar
2009-01-12 22:59 ` H. Peter Anvin
2009-01-13 2:43 ` Andi Kleen
2009-01-13 12:28 ` Ingo Molnar
2009-01-12 22:34 ` Ravikiran G Thirumalai
2009-01-12 23:00 ` Ingo Molnar
2009-01-12 23:09 ` Ingo Molnar
2009-01-13 2:14 ` Ravikiran G Thirumalai
2009-01-13 12:00 ` Peter Zijlstra
2009-01-13 12:33 ` Ingo Molnar
2009-01-13 18:13 ` Ravikiran G Thirumalai
2009-01-13 18:34 ` Ingo Molnar
2009-01-13 18:42 ` Ravikiran G Thirumalai
2009-01-14 7:31 ` Ingo Molnar
2009-01-15 7:15 ` Ravikiran G Thirumalai
2009-01-14 9:08 ` Andi Kleen
2009-01-14 14:41 ` Frederik Deweerdt
2009-01-14 15:20 ` Andi Kleen
2009-01-14 15:10 ` Frederik Deweerdt
2009-01-12 22:54 ` Mike Travis
2009-01-12 23:51 ` Frederik Deweerdt
2009-01-12 23:57 ` Mike Travis
2009-01-13 0:01 ` Ingo Molnar
2009-01-13 3:36 ` Andi Kleen
2009-01-13 12:14 ` Ingo Molnar [this message]
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