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: <201001192134.11518.rjw@sisk.pl>
Date:	Tue, 19 Jan 2010 21:34:11 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	"linux-mm" <linux-mm@...ck.org>,
	linux-pm@...ts.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.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 Tuesday 19 January 2010, Oliver Neukum wrote:
> Am Montag, 18. Januar 2010 22:06:36 schrieb Rafael J. Wysocki:
> > I was concerned about another problem, though, which is what happens if the
> > suspend process runs in parallel with a memory allocation that started earlier
> > and happens to do some I/O.  I that case the suspend process doesn't know
> > about the I/O done by the mm subsystem and may disturb it in principle.
> 
> How could this happen? Who would allocate that memory?
> Tasks won't be frozen while they are allocating memory.

The majority of kernel threads are not freezable, but I agree it's rather low
risk.

Rafael
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