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

From: Rafael J. Wysocki
Date: Thu Jan 21 2010 - 16:38:40 EST

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.

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