linux-kernel - Re: [patch -mm 4/9 v2] oom: remove compulsory panic_on

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Message-Id: <20100217111659.7324.A69D9226@jp.fujitsu.com>
Date:	Wed, 17 Feb 2010 11:19:46 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Lubos Lunak <l.lunak@...e.cz>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch -mm 4/9 v2] oom: remove compulsory panic_on_oom mode

> +/*
> + * The pagefault handler calls here because it is out of memory, so kill a
> + * memory-hogging task.  If a populated zone has ZONE_OOM_LOCKED set, a parallel
> + * oom killing is already in progress so do nothing.  If a task is found with
> + * TIF_MEMDIE set, it has been killed so do nothing and allow it to exit.
> + */
> +void pagefault_out_of_memory(void)
> +{
> +	if (!try_set_system_oom())
> +		return;
> +	out_of_memory(NULL, 0, 0, NULL);
> +	clear_system_oom();
> +}

At least, I agree pagefault oom part. it need ZONE_OOM_LOCKED too.
if you make separated patch, I'll ack it. I don't know memcg part is 
correct or not.



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