linux-kernel - Re: [MM] Remove rss batching from copy_page

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Message-ID: <87my3280mb.fsf@basil.nowhere.org>
Date:	Wed, 04 Nov 2009 22:02:20 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, Tejun Heo <tj@...nel.org>
Subject: Re: [MM] Remove rss batching from copy_page_range()

Christoph Lameter <cl@...ux-foundation.org> writes:

> From: Christoph Lameter <cl@...ux-foundation.org>
> Subject: Remove rss batching from copy_page_range()
>
> With per cpu counters in mm there is no need for batching
> mm counter updates anymore. Update counters directly while
> copying pages.

Hmm, but with all the inlining with some luck the local
counters will be in registers. That will never be the case
with the per cpu counters.

So I'm not sure it's really an improvement?

-Andi

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