From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Oliver Neukum <oliver@neukum.org>
Subject: Re: [linux-pm] [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was: Re: Memory allocations in .suspend became very unreliable)
Date: Tue, 19 Jan 2010 21:34:11 +0100
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Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Minchan Kim <minchan.kim@gmail.com>,
       Maxim Levitsky <maximlevitsky@gmail.com>,
       "linux-mm" <linux-mm@kvack.org>, linux-pm@lists.linux-foundation.org,
       LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>
References: <1263745267.2162.42.camel@barrios-desktop> <201001182206.36365.rjw@sisk.pl> <201001191015.00470.oliver@neukum.org>
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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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