linux-kernel - Re: Re: [-mm][PATCH 8/10] fix shmem page migration incorrectness on memcgroup

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Date:	Fri, 27 Jun 2008 21:24:38 +0900 (JST)
From:	kamezawa.hiroyu@...fujitsu.com
To:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	MinChan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: Re: [-mm][PATCH 8/10] fix shmem page migration incorrectness on memcgroup

----- Original Message -----

>> But situation is a bit complicated.
>> - shmem's page is charged as file-cache.
>> - shmem's swap cache is still charged by mem_cgroup_cache_charge() because
>>   it's implicitly (to memcg) converted to swap cache. 
>> - anon's swap cache is charged by mem_cgroup_uncharge_cache_page()
>> 
>I'm sorry if I misunderstand something.
>
>I think anon's swap cache is:
>
>- charged by nowhere as "cache".
yes.
>  If anon pages are also on swap cache, charges for them remain charged
>  even when mem_cgroup_uncharge_page() is called, because it checks PG_swapca
che.
>  So, as a result, anon's swap cache is charged.
yes.

>- uncharged by memcgroup_uncharge_page() in __delete_from_swap_cache()
>  after clearing PG_swapcache.
>
>right?
>
You're right. Sorry for confusion.

Thanks,
-Kame

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