From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Nigel Cunningham <ncunningham@crca.org.au>
Subject: Re: [linux-pm] [RFC][PATCH] PM: Force GFP_NOIO 
 =?iso-8859-1?q?during=09suspend/resume?= (was: Re: Memory allocations in 
 =?iso-8859-1?q?=2Esuspend=09became_very?= unreliable)
Date: Thu, 21 Jan 2010 22:38:47 +0100
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Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       LKML <linux-kernel@vger.kernel.org>, "linux-mm" <linux-mm@kvack.org>,
       linux-pm@lists.linux-foundation.org,
       Andrew Morton <akpm@linux-foundation.org>
References: <20100120085053.405A.A69D9226@jp.fujitsu.com> <201001212121.50272.rjw@sisk.pl> <4B58BC31.1040406@crca.org.au>
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On Thursday 21 January 2010, Nigel Cunningham wrote:
> Hi.
> 
> Rafael J. Wysocki wrote:
> > On Thursday 21 January 2010, KOSAKI Motohiro wrote:
> >>  - Ask all drivers how much they require memory before starting suspend and
> >>    Make enough free memory at first?
> > 
> > That's equivalent to reworking all drivers to allocate memory before suspend
> > eg. with the help of PM notifiers.  Which IMHO is unrealistic.
> 
> What's unrealistic about it? I can see that it would be a lot of work,
> but unrealistic? To me, at this stage, it sounds like the ideal solution.

First, we'd need to audit the drivers which is quite a task by itself.
Second, we'd need to make changes, preferably test them or find someone with
suitable hardware to do that for us and propagate them upstream.

I don't really think we have the time to do it.

Rafael
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