linux-kernel - Re: [RFC MM] mmap_sem scaling: only scan cpus used by an mm

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Message-ID: <20091106191448.GD819@basil.fritz.box>
Date:	Fri, 6 Nov 2009 20:14:48 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>, npiggin@...e.de,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>
Subject: Re: [RFC MM] mmap_sem scaling: only scan cpus used by an mm

On Fri, Nov 06, 2009 at 01:53:35PM -0500, Christoph Lameter wrote:
> One way to reduce the cost of the writer lock is to track the cpus used
> and loop over the processors in that bitmap.

Can't you use the same mask as is used for TLB flushing?

-Andi
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