linux-kernel - Re: [PATCH] compaction: Remove mem_cgroup_del

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Message-ID: <AANLkTi=93QLYaO9gktVPxu_4gD9sV1tUPL9duj7RqL0X@mail.gmail.com>
Date:	Thu, 9 Dec 2010 07:25:18 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH] compaction: Remove mem_cgroup_del_lru

On Thu, Dec 9, 2010 at 1:43 AM, Johannes Weiner <hannes@...xchg.org> wrote:
> On Wed, Dec 08, 2010 at 12:01:26AM +0900, Minchan Kim wrote:
>> del_page_from_lru_list alreay called mem_cgroup_del_lru.
>> So we need to call it again. It makes wrong stat of memcg and
>> even happen VM_BUG_ON hit.
>>
>> Cc: Balbir Singh <balbir@...ux.vnet.ibm.com>
>> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
>> Cc: Mel Gorman <mel@....ul.ie>
>> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
>
> Reviewed-by: Johannes Weiner <hannes@...xchg.org>
>
> But regarding the severity of this: shouldn't the second deletion
> attempt be caught by the TestClearPageCgroupAcctLRU() early in
> mem_cgroup_del_lru_list()?
>

Right, I missed that.
Andrew, I will resend modified description.

Thanks for careful review again, Hannes.

-- 
Kind regards,
Minchan Kim
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