linux-kernel - Re: [patch][v2] swap: virtual swap readahead

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Message-ID: <20090603150242.GB1065@one.firstfloor.org>
Date:	Wed, 3 Jun 2009 17:02:42 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch][v2] swap: virtual swap readahead

> I'm not too worried about not walking the page tables,
> because swap is an extreme slow path anyway.

it was more about taking less locks and doing less mappings.
Especially highmem pte mappings can be quite expensive, because
they have to flush parts of the TLB.

-Andi

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