linux-kernel - Re: [Update][PATCH] MM / PM: Force GFP_NOIO during suspend/hibernation and resume

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Message-ID: <1264238962.16031.4.camel@maxim-laptop>
Date:	Sat, 23 Jan 2010 11:29:22 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-pm@...ts.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Update][PATCH] MM / PM: Force GFP_NOIO during
 suspend/hibernation and resume

On Fri, 2010-01-22 at 22:19 +0100, Rafael J. Wysocki wrote: 
> On Friday 22 January 2010, Maxim Levitsky wrote:
> > On Fri, 2010-01-22 at 10:42 +0900, KOSAKI Motohiro wrote: 
> > > > > > Probably we have multiple option. but I don't think GFP_NOIO is good
> > > > > > option. It assume the system have lots non-dirty cache memory and it isn't
> > > > > > guranteed.
> > > > > 
> > > > > Basically nothing is guaranteed in this case.  However, does it actually make
> > > > > things _worse_?  
> > > > 
> > > > Hmm..
> > > > Do you mean we don't need to prevent accidental suspend failure?
> > > > Perhaps, I did misunderstand your intention. If you think your patch solve
> > > > this this issue, I still disagree. but If you think your patch mitigate
> > > > the pain of this issue, I agree it. I don't have any reason to oppose your
> > > > first patch.
> > > 
> > > One question. Have anyone tested Rafael's $subject patch? 
> > > Please post test result. if the issue disapper by the patch, we can
> > > suppose the slowness is caused by i/o layer.
> > 
> > I did.
> > 
> > As far as I could see, patch does solve the problem I described.
> > 
> > Does it affect speed of suspend? I can't say for sure. It seems to be
> > the same.
> 
> Thanks for testing.

I'll test that too, soon.
Just to note that I left my hibernate loop run overnight, and now I am
posting from my notebook after it did 590 hibernate cycles.


Offtopic, but Note that to achieve that I had to stop using global acpi
hardware lock. I tried all kinds of things, but for now it just hands
from time to time.
See http://bugzilla.kernel.org/show_bug.cgi?id=14668

Best regards,
Maxim Levitsky




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