Re: [PATCH 1/5] mm: Add __GFP_NO_OOM_KILL flag

[David Rientjes]

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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