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

[Andrew Morton]

On Thu, 7 May 2009 20:09:52 +0200
"Rafael J. Wysocki" <rjw@xxxxxxx> wrote:

> > > > I'm suspecting that hibernation can allocate its pages with
> > > > __GFP_FS|__GFP_WAIT|__GFP_NORETRY|__GFP_NOWARN, and the page allocator
> > > > will dtrt: no oom-killings.
> > > > 
> > > > In which case, processes_are_frozen() is not needed at all?
> > > 
> > > __GFP_NORETRY alone causes it to fail relatively quickly, but I'll try with
> > > the combination.
> > 
> > OK.  __GFP_WAIT is the big hammer.
> 
> Unfortunately it fails too quickly with the combination as well, so it looks
> like we can't use __GFP_NORETRY during hibernation.

hm.

So where do we stand now?

I'm not a big fan of the global application-specific state change
thing.  Something like __GFP_NO_OOM_KILL has a better chance of being
reused by other subsystems in the future, which is a good indicator.

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