linux-kernel - Re: Subject: [RFC MM] mmap_sem scaling: Use mutex and percpu counter instead

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Message-ID: <alpine.DEB.1.10.0911061208370.5187@V090114053VZO-1>
Date:	Fri, 6 Nov 2009 12:08:54 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
cc:	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: Subject: [RFC MM] mmap_sem scaling: Use mutex and percpu counter
 instead

On Fri, 6 Nov 2009, Andi Kleen wrote:

> Yes but all the major calls still take mmap_sem, which is not ranged.

But exactly that issue is addressed by this patch!

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