linux-kernel - Re: [PATCH V3] nommu: add anonymous page memcg accounting

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Message-Id: <20101022122010.793bebac.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 22 Oct 2010 12:20:10 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Steven J. Magnani" <steve@...idescorp.com>
Cc:	linux-mm@...ck.org, balbir@...ux.vnet.ibm.com, dhowells@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] nommu: add anonymous page memcg accounting

On Thu, 21 Oct 2010 07:28:08 -0500
"Steven J. Magnani" <steve@...idescorp.com> wrote:

> Add the necessary calls to track VM anonymous page usage (only).
> 
> V3 changes:
> * Use vma->vm_mm instead of current->mm when charging pages, for clarity
> * Document that reclaim is not possible with only anonymous page accounting
>   so the OOM-killer is invoked when a limit is exceeded
> * Add TODO to implement file cache (reclaim) support or optimize away
>   page_cgroup->lru
> 
> V2 changes:
> * Added update of memory cgroup documentation
> * Clarify use of 'file' to distinguish anonymous mappings
> 
> Signed-off-by: Steven J. Magnani <steve@...idescorp.com>

Thanks,

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

BTW, have you tried oom_notifier+NOMMU memory limit oom-killer ?
It may be a chance to implement a custom OOM-Killer in userland on
EMBEDED systems.

Thanks,
-Kame

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