linux-kernel - Re: [PATCH v3 1/4] memcg: cleanup useless LRU_ALL

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Message-ID: <4FE83695.6010007@jp.fujitsu.com>
Date:	Mon, 25 Jun 2012 18:59:49 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Wanpeng Li <liwp.linux@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Balbir Singh <bsingharora@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mike Frysinger <vapier@...too.org>,
	Arun Sharma <asharma@...com>, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: Re: [PATCH v3 1/4] memcg: cleanup useless LRU_ALL_EVICTABLE

(2012/06/25 18:33), Michal Hocko wrote:
> Marking this patch as memcg is quite misleading. mm is more suitable.
>
> On Mon 25-06-12 16:43:32, Wanpeng Li wrote:
>> From: Wanpeng Li <liwp@...ux.vnet.ibm.com>
>>
>> Since LRU_ALL_EVICTABLE is useless, just remove it.
>
> It's really strange but I do not see any usage of this except for it's
> introduction. So agreed to remove it.
>
>> Add LRU_ALL_UNEVICTABLE to mask unevictable pages.
>
> Does it really make sense to introduce just for two uses in a single
> function?
>

I don't think so.

I doubt LRU_ALL_UNEVICTABLE implies there are other UNEVICTABLE LRUS
other than LRU_UNEVICTABLE.

For example, LRU_ALL_UNEVICTABLE means
	if total_swap==0, UNEVICTABLE+ANON
	if total_swap!=0, UNEVICTABLE,

This will have its own meanings...but I don't see there are any users.

Thanks,
-Kame


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