linux-kernel - Re: [PATCH -mm][preview] memcg: a patch series for next [0/9]

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Date:	Wed, 20 Aug 2008 09:00:50 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	"yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	ryov@...inux.co.jp
Subject: Re: [PATCH -mm][preview] memcg: a patch series for next [0/9]

KAMEZAWA Hiroyuki wrote:
> Hi, 
> 
> This post is for showing what I'm trying now.
> 
> This patch set is for memory resource controller.
> 4 purposes here.
>   - improve performance of memcg.
>   - remove lock_page_cgroup()
>   - making page_cgroup->flags to be atomic_ops.
>   - support mem+swap controller.
> 
> But this is still under test and the series is not well organised.
> and base tree is old. (2.6.27-rc1-mm1) I'll rebase this set to newer mmtom tree.
> 
> Maybe this set have some troubles/objections but I think the direction is not bad.
> 
> Patch description. (patch ordering is bad. I'll fix in the next post.)
> 
> [1/9] ... private_counter ...replace res_counter with my own counter.
>           This is for supporting mem+swap controller.
>           (And I think memcg has a bit different characteristics from other
>            users of res_counter....)
> 
> [2/9] ... change-order-uncharge ...
>           This patch is for making it easy to handle swap-cache.
> 
> [3/9] ... atomic_flags
>           This patch changes operations for page_cgroup->flags to be atomic_ops.
> 
> [4/9] ... delayed freeing.
>           delaying to free page_cgroup at uncharge.
> 
> [5/9] ... RCU freeing of page_cgroup
>           free page_cgroup by RCU.
> 
> [6/9] ... lockress page cgroup.
>           remove lock_page_cgroup() and use RCU semantics.
> 
> [7/9] ... add preftech
>           add prefetch() macro
> 
> [8/9] ... mem+swap controller base.
>           introduce mem+swap controller. A bit big patch....but have tons of TODO.
>           and have troubles. (it seems it's difficult to cause OOM killer.)
> 
> [9/9] ... mem+swap controller control files.
>           add mem+swap controller's control files.
> 
> I'd like to push patch [2,3,4,5,6,7] first.
> 

I took a quick look at the patches, patch 1 seemed not so clear, why can't we
enhance or fix resource counters? I'll review/test the patches tonight.

-- 
	Balbir
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