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Subject: Re: [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was:
 Re: [linux-pm] Memory allocations in .suspend became very unreliable)
From: Maxim Levitsky <maximlevitsky@gmail.com>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.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>
In-Reply-To: <201001301947.10453.rjw@sisk.pl>
References: <1263549544.3112.10.camel@maxim-laptop>
	 <201001170138.37283.rjw@sisk.pl> <1264866419.27933.0.camel@maxim-laptop>
	 <201001301947.10453.rjw@sisk.pl>
Content-Type: text/plain; charset="UTF-8"
Date: Sat, 30 Jan 2010 22:37:43 +0200
Message-ID: <1264883863.13861.3.camel@maxim-laptop>
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Sender: linux-kernel-owner@vger.kernel.org
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On Sat, 2010-01-30 at 19:47 +0100, Rafael J. Wysocki wrote: 
> On Saturday 30 January 2010, Maxim Levitsky wrote:
> > On Sun, 2010-01-17 at 01:38 +0100, Rafael J. Wysocki wrote: 
> > > Hi,
> > > 
> > > I thing the snippet below is a good summary of what this is about.
> > 
> > Any progress on that?
> 
> Well, I'm waiting for you to report back:
> http://patchwork.kernel.org/patch/74740/
> 
> The patch is appended once again for convenience.

Ah, sorry!

I used the second version (with the locks) and it works for sure (~500
cycles)

However, as I discovered today, it takes the lock also for GFP_ATOMIC,
and thats why I see several backtraces in the kernel log. Anyway this
isn't important.

I forgot all about this patch, and I am compiling the kernel right away.
Will put the kernel through the hibernate loop tonight.

Best regards,
Maxim Levitsky

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