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

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Message-ID: <20090604100436.GA1602@cmpxchg.org>
Date:	Thu, 4 Jun 2009 12:04:36 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andi Kleen <andi@...stfloor.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch][v2] swap: virtual swap readahead

On Thu, Jun 04, 2009 at 10:46:28AM +0900, KAMEZAWA Hiroyuki wrote:

> I wonder (I just wonder..) can we add code like following here ?
> 
>    /* we do _readahead_ here. Then, we don't want to add too much jobs to vm/IO*/
>    if (swp != entry)
> 	gfp_mask &= ~__GFP_WAIT
> > +		page = read_swap_cache_async(swp, gfp_mask, vma, pos);
> 
> too slow ?

Good idea, certainly worth evaluating.  But not in this patch, I don't
want to change _everything_ at once :-)

	Thanks, Hannes
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