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Date: Fri, 13 Sep 2002 14:53:07 -0700
From: Andrew Morton <akpm@digeo.com>
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To: Rik van Riel <riel@conectiva.com.br>
CC: Pavel Machek <pavel@ucw.cz>, kernel list <linux-kernel@vger.kernel.org>
Subject: Re: Good way to free as much memory as possible under 2.5.34?
References: <20020913212921.GA17627@atrey.karlin.mff.cuni.cz> <Pine.LNX.4.44L.0209131830560.1857-100000@imladris.surriel.com>
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Rik van Riel wrote:
> 
> On Fri, 13 Sep 2002, Pavel Machek wrote:
> 
> > Allocating memory is pain because I have to free it afterwards. Yep I
> > have such code, but it is ugly. try_to_free_pages() really seems like
> > cleaner solution to me... if you only tell me how to fix it :-).
> 
> "Fixing" the VM just so it behaves the way swsuspend wants is
> out. If swsuspend relies on all other subsystems playing nicely,
> I think it should be removed from the kernel.
> 

Yup.  Martin Bligh is cooking up a multi-page allocation API, so when that's
in place, swsusp need only do:

	LIST_HEAD(foo);
	alloc_many_pages(&foo, nr_pages, __GFP_HIGHMEM|__GFP_WAIT);
	free_many_pages(&foo);

So I suggest you do something local for the while, plan to use that later.

(Actually, the implementation would probably have a heart attack if you
asked for 100,000 pages so you may need to sit in a loop there; we'll see).
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