linux-kernel - Re: [RFC][PATCH 0/2] memcg: oom notifier and handling oom by user

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Message-ID: <20100308172609.GS3073@balbir.in.ibm.com>
Date:	Mon, 8 Mar 2010 22:56:09 +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>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 0/2]  memcg: oom notifier and handling oom by user

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2010-03-08 16:24:14]:

> This 2 patches is for memcg's oom handling.
> 
> At first, memcg's oom doesn't mean "no more resource" but means "we hit limit."
> Then, daemons/user shells out of a memcg can work even if it's under oom.
> So, if we have notifier and some more features, we can do something moderate
> rather than killing at oom. 
> 
> This patch includes
> [1/2] oom notifier for memcg (using evetfd framework of cgroups.)
> [2/2] oom killer disalibing and hooks for waitq and wake-up.
> 
> When memcg's oom-killer is disabled, all tasks which request accountable memory
> will sleep in waitq. It will be waken up by user's action as
>  - enlarge limit. (memory or memsw)
>  - kill some tasks
>  - move some tasks (account migration is enabled.)
> 

Hmm... I've not seen the waitq and wake-up patches, but does that mean
user space will control resumtion of tasks?


-- 
	Three Cheers,
	Balbir
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