linux-kernel - Re: [PATCH 0/12] memcg updates v5

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Message-ID: <48DC9AF2.1050101@linux.vnet.ibm.com>
Date:	Fri, 26 Sep 2008 13:48:58 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Hansen <haveblue@...ibm.com>, ryov@...inux.co.jp
Subject: Re: [PATCH 0/12] memcg updates v5

KAMEZAWA Hiroyuki wrote:
> Hi, I updated the stack and reflected comments.
> Against the latest mmotm. (rc7-mm1)
> 
> Major changes from previous one is 
>   - page_cgroup allocation/lookup manner is changed.
>     all FLATMEM/DISCONTIGMEM/SPARSEMEM and MEMORY_HOTPLUG is supported.
>   - force_empty is totally rewritten. and a problem that "force_empty takes long time"
>     in previous version is fixed (I think...)
>   - reordered patches.
>      - first half are easy ones.
>      - second half are big ones.
> 
> I'm still testing with full debug option. No problem found yet.
> (I'm afraid of race condition which have not been caught yet.)
> 
> [1/12]  avoid accounting special mappings not on LRU. (fix)
> [2/12]  move charege() call to swapped-in page under lock_page() (clean up)
> [3/12]  make root cgroup to be unlimited. (change semantics.)
> [4/12]  make page->mapping NULL before calling uncharge (clean up)
> [5/12]  make page->flags to use atomic ops. (changes in infrastructure)
> [6/12]  optimize stat. (clean up)
> [7/12]  add support function for moving account. (new function)
> [8/12]  rewrite force_empty to use move_account. (change semantics.)
> [9/12]  allocate all page_cgroup at boot. (changes in infrastructure)
> [10/12] free page_cgroup from LRU in lazy way (optimize)
> [11/12] add page_cgroup to LRU in lazy way (optimize)
> [12/12] fix race at charging swap  (fix by new logic.)
> 
> *Any* comment is welcome.

Kame,

I'm beginning to review test the patches now. It would be really nice to split
the development patches from the maintenance ones. I think the full patchset has
too many things and is confusing to look at.


-- 
	Balbir
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