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Date: Tue, 13 May 2008 22:00:44 +0900
From: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
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To: Rik van Riel <riel@redhat.com>
CC: lee.schermerhorn@hp.com, akpm@linux-foundation.org,
       kosaki.motohiro@jp.fujitsu.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH -mm 05/15] free swap space on swap-in/activation
References: <20080428181835.502876582@redhat.com>	<20080428181852.620969450@redhat.com>	<4828283C.4000803@mxp.nes.nec.co.jp> <20080512093307.2ace3096@bree.surriel.com>
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On 2008/05/12 22:33 +0900, Rik van Riel wrote:
> On Mon, 12 May 2008 20:21:32 +0900
> Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote:
> 
>> So, the intention of this patch is
>> not to free a swap space of swap cache that has already swapped in
>> and only used one process as do_swap_page() does,
>> but to free a swap space that is only used as a swap cache
>> (not used by any processes), right?
> 
> No.  The code should also free the swap space of pages that are
> mapped by processes, in order to free up swap space for other
> uses.  This only happens if vm_swap_full() is true.
> 

OK.

I thought that current code cannot free the swap space
of pages that are mapped by processes(and I think it cannot),
so I asked the intention of this patch for clarification.


Thanks,
Daisuke Nishimura.