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

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Message-Id: <201001212238.47471.rjw@sisk.pl>
Date:	Thu, 21 Jan 2010 22:38:47 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Nigel Cunningham <ncunningham@...a.org.au>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm" <linux-mm@...ck.org>,
	linux-pm@...ts.linux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [linux-pm] [RFC][PATCH] PM: Force GFP_NOIO 
 during	suspend/resume (was: Re: Memory allocations in 
 .suspend	became very unreliable)

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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