linux-kernel - Re: [patch 6/7 -mm] oom: avoid oom killer for lowmem allocations

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Date:	Wed, 10 Feb 2010 23:13:09 -0500
From:	Rik van Riel <riel@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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 6/7 -mm] oom: avoid oom killer for lowmem allocations

On 02/10/2010 11:32 AM, David Rientjes wrote:

> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1914,6 +1914,9 @@ rebalance:
>   	 * running out of options and have to consider going OOM
>   	 */
>   	if (!did_some_progress) {
> +		/* The oom killer won't necessarily free lowmem */
> +		if (high_zoneidx<  ZONE_NORMAL)
> +			goto nopage;
>   		if ((gfp_mask&  __GFP_FS)&&  !(gfp_mask&  __GFP_NORETRY)) {
>   			if (oom_killer_disabled)
>   				goto nopage;

Are there architectures that only have one memory zone?

s390 or one of the other virtualized-only architectures perhaps?

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