linux-kernel - Re: [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was: Re: [linux-pm] Memory allocations in .suspend became very unreliable)

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Message-ID: <1265053916.26421.1.camel@maxim-laptop>
Date:	Mon, 01 Feb 2010 21:51:56 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-pm@...ts.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was:
 Re: [linux-pm] Memory allocations in .suspend became very unreliable)

On Sat, 2010-01-30 at 22:37 +0200, Maxim Levitsky wrote: 
> 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.

I did 123 hibernate cycles on my notebook. Everything is fine.
This patch very very likely is working.

Best regards,
Maxim Levitsky

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