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Date: Fri, 18 Jul 2003 12:37:28 -0700
From: Andrew Morton <akpm@osdl.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: petero2@telia.com, linux-kernel@vger.kernel.org
Subject: Re: Software suspend testing in 2.6.0-test1
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Pavel Machek <pavel@ucw.cz> wrote:
>
> > It would be much better to freeze kernel threads _after_ doing the big
> > memory shrink.
> 
> I wanted to avoid that: we do want user threads refrigerated at that
> point so that we know noone is allocating memory as we are trying to
> do memory shrink.

	freeze(threads which have task->mm)
	shrink_memory();
	freeze(threads which have !task->mm)

That's pretty simple.

> I'd like to avoid having refrigerator run in two phases....

The whole thing can deadlock without kernel thread services.