linux-kernel - Re: [PATCH 1/5] mm: Add __GFP_NO_OOM

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Date:	Thu, 7 May 2009 11:50:04 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Andrew Morton <akpm@...ux-foundation.org>, fengguang.wu@...el.com,
	linux-pm@...ts.linux-foundation.org, pavel@....cz,
	torvalds@...ux-foundation.org, jens.axboe@...cle.com,
	alan-jenkins@...fmail.co.uk, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org
Subject: Re: [PATCH 1/5] mm: Add __GFP_NO_OOM_KILL flag

On Thu, 7 May 2009, Rafael J. Wysocki wrote:

> Unfortunately it fails too quickly with the combination as well, so it looks
> like we can't use __GFP_NORETRY during hibernation.
> 

If you know that no other tasks are in the oom killer at suspend time, you 
can do what I mentioned earlier:

	struct zone *z;
	for_each_populated_zone(z)
		zone_set_flag(z, ZONE_OOM_LOCKED);

and then later

	for_each_populated_zone(z)
		zone_clear_flag(z, ZONE_OOM_LOCKED);

The only race there is if a task is currently in the oom killer and will 
subsequently clear ZONE_OOM_LOCKED for its zonelist.
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