From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Oliver Neukum <oliver@neukum.org>
Subject: Re: [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was: Re: [linux-pm] Memory allocations in .suspend became very unreliable)
Date: Mon, 18 Jan 2010 21:41:49 +0100
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Cc: Maxim Levitsky <maximlevitsky@gmail.com>,
       linux-pm@lists.linux-foundation.org,
       LKML <linux-kernel@vger.kernel.org>, "linux-mm" <linux-mm@kvack.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>
References: <1263549544.3112.10.camel@maxim-laptop> <201001171455.55909.rjw@sisk.pl> <201001181800.38574.oliver@neukum.org>
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On Monday 18 January 2010, Oliver Neukum wrote:
> Am Sonntag, 17. Januar 2010 14:55:55 schrieb Rafael J. Wysocki:
> > +void mm_force_noio_allocations(void)
> > +{
> > +       /* Wait for all slowpath allocations using the old mask to complete */
> > +       down_write(&gfp_allowed_mask_sem);
> > +       saved_gfp_allowed_mask = gfp_allowed_mask;
> > +       gfp_allowed_mask &= ~(__GFP_IO | __GFP_FS);
> > +       up_write(&gfp_allowed_mask_sem);
> > +}
> 
> In addition to this you probably want to exhaust all memory reserves
> before you fail a memory allocation

I'm not really sure what you mean.

> and forbid the OOM killer to run.

The OOM killer has already been disabled at this point, by the freezer.

Rafael
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