linux-kernel - Re: [linux-pm] [PATCH] Remove process freezer from suspend to RAM pathway

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Message-ID: <Pine.LNX.4.44L0.0707031200240.3936-100000@iolanthe.rowland.org>
Date:	Tue, 3 Jul 2007 12:03:33 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Matthew Garrett <mjg59@...f.ucam.org>
cc:	linux-kernel@...r.kernel.org, <linux-pm@...ts.linux-foundation.org>
Subject: Re: [linux-pm] [PATCH] Remove process freezer from suspend to RAM
 pathway

On Tue, 3 Jul 2007, Matthew Garrett wrote:

> Suspend to RAM on a machine with / on a fuse filesystem turns out to be 
> a screaming nightmare - either the suspend fails because syslog (for 
> instance) can't be frozen, or the machine deadlocks for some other 
> reason I haven't tracked down. We could "fix" fuse, or alternatively we 
> could do what we do for suspend to RAM on other platforms (PPC and APM) 
> and just not use the freezer.

Quite apart from the sync() matter, _any_ synchronous call to a FUSE 
filesystem during STR will cause trouble.  Even if the user task 
implementing the filesystem isn't frozen, when it tries to carry out 
some I/O to a suspended device it will either:

	block until the system wakes up, or

	cause the suspend to abort.

Neither outcome is desirable.

Alan Stern

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