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

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Message-Id: <E1I5oq4-0004sc-00@dorka.pomaz.szeredi.hu>
Date:	Tue, 03 Jul 2007 22:19:08 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	stern@...land.harvard.edu
CC:	oliver@...kum.org, 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

> > 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.

I strongly believe, that we don't want to deal with it.  If we want to
call sync(), do it while the system is fully operational.  It's a best
effort thing anyway, and you can loose data in other ways if resume
fails.

Miklos
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