linux-kernel - [RFC PATCH] No Reclaim LRU Infrastructure enhancement for memcgroup

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Date:	Wed, 28 May 2008 20:04:38 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>, balbir@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [RFC PATCH] No Reclaim LRU Infrastructure enhancement for memcgroup

Hi

> In my understanding, 2 checks we have to do.
> 
> 1. When memcg finds PG_noreclaim page in its LRU, move it to noreclaim list of
>    memcg.
> 2. When PG_noreclaim page is moved back to generic LRU, memcg should move
>    it on its list. (we have to add a hook somewhere.)
> 
> But this may break current 'loose' synchronization between global LRU and
> memcg's LRU. When PG_noreclaim page is put back into active/inactive LRU ?
> 
> concerns are
> A. how to implement '2'

I tried to implement it today.
this patch is made against "[PATCH -mm 13/16] No Reclaim LRU Infrastructure"


> B. race condtions.

don't worry :)
it isn't big problem.

global lru is reclaimbale and memcg lru is noreclaimable
	-> we can repair at move lru of shrink_[in]active_page().

global lru is noreclaimbale and memcg lru is reclaimable
	-> we can repair mem_cgroup_isolate_pages()



Download attachment "rvr-13.2-kosaki-memcg-noreclaim.patch" of type "application/octet-stream" (7316 bytes)

Download attachment "rvr-13.3-kosaki-memcg-stat.patch" of type "application/octet-stream" (1165 bytes)