linux-kernel - Re: [PATCH 2/4] modify swap_map and add SWAP_HAS

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Date:	Sat, 30 May 2009 19:35:54 +0800
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/4] modify swap_map and add SWAP_HAS_CACHE flag.

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-05-30 20:16:51]:

> Balbir Singh wrote:
> >>  #define SWAP_CLUSTER_MAX 32
> >>
> >> -#define SWAP_MAP_MAX	0x7fff
> >> -#define SWAP_MAP_BAD	0x8000
> >> -
> >> +#define SWAP_MAP_MAX	0x7ffe
> >> +#define SWAP_MAP_BAD	0x7fff
> >> +#define SWAP_HAS_CACHE  0x8000		/* There is a swap cache of entry. */
> >
> > Why count, can't we use swp->flags?
> >
> 
> Hmm ? swap_map just only a "unsiged short" value per entry..sorry,
> I can't catch what you mention to.

Sorry for the noise, the count is directly contained in swap_map[].

-- 
	Balbir
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