linux-kernel - Re: s2disk hang update

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Message-Id: <20100224102037.2cca4f83.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 24 Feb 2010 10:20:37 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Alan Jenkins <sourcejedi.lkml@...glemail.com>,
	Mel Gorman <mel@....ul.ie>, hugh.dickins@...cali.co.uk,
	Pavel Machek <pavel@....cz>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>
Subject: Re: s2disk hang update

On Tue, 23 Feb 2010 22:13:56 +0100
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> Well, it still looks like we're waiting for create_workqueue_thread() to
> return, which probably is trying to allocate memory for the thread
> structure.
> 
> My guess is that the preallocated memory pages freed by
> free_unnecessary_pages() go into a place from where they cannot be taken for
> subsequent NOIO allocations.  I have no idea why that happens though.
> 
> To test that theory you can try to change GFP_IOFS to GFP_KERNEL in the
> calls to clear_gfp_allowed_mask() in kernel/power/hibernate.c (and in
> kernel/power/suspend.c for completness).
> 

If allocation of kernel threads for stop_machine_run() is the problem,

What happens when
1. use CONIFG_4KSTACK
or
2. make use of stop_machine_create(), stop_machine_destroy().
   A new interface added by this commit.
  http://git.kernel.org/?p=linux/kernel/git/torvalds/  linux-2.6.git;a=commit;h=9ea09af3bd3090e8349ca2899ca2011bd94cda85
   You can do no-fail stop_machine_run().

Thanks,
-Kame

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