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

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Date:	Tue, 3 Jul 2007 16:02:37 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Oliver Neukum <oliver@...kum.org>
cc:	Miklos Szeredi <miklos@...redi.hu>, <mjg59@...f.ucam.org>,
	<linux-kernel@...r.kernel.org>, <pavel@....cz>,
	<linux-pm@...ts.linux-foundation.org>
Subject: Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to
 RAM pathway

On Tue, 3 Jul 2007, Oliver Neukum wrote:

> Well, but you did remove sys_sync() from the freezer, which is
> and must be called in the hibernate path.

That's not really true.  We _want_ to call sys_sync() in both the 
hibernate and suspend paths (in case the batteries run down), to help 
avoid filesystem problems if something goes wrong with the resume.  But 
it isn't a hard requirement.

> > I'm not sure why this can't be made atomic, but assuming, that it
> > can't, fuse should still not need to be implicated.  If it is, that's
> > an indication about something wrong in the suspend procedure.
> 
> Nope, something's wrong in fuse. You must be able to deal with sync
> until every task is frozen.

That's ridiculous.  FUSE itself runs partially as a user task.  How can
you expect it to carry out a sync or anything else when it is frozen?

I suppose you could "deal" with it by having the kernel portion return
an error if the userspace part is frozen.  If the hibernate/suspend 
code bothered to check the return value, it would immediately abort 
the suspend.

Alan Stern

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