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

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Message-Id: <E1I6jot-0003U1-00@dorka.pomaz.szeredi.hu>
Date:	Fri, 06 Jul 2007 11:09:43 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	oliver@...kum.org
CC:	miklos@...redi.hu, rjw@...k.pl, nigel@...pend2.net, pavel@....cz,
	benh@...nel.crashing.org, mjg59@...f.ucam.org,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH] Remove process freezer from suspend to RAM pathway

> > > Moreover, if FUSE implements syncing, then the sync from within the freezer
> > > will almost certainly deadlock.
> > 
> > Rafael, think positively: by the time fuse implements sync(), the
> > freezer will be long gone ;)
> 
> Now you are entering really dangerous territory.
> If you can implement a meaningfull sync method, you must have dirty
> pages in the page cache. That means you are in the page freeing path
> of the vm. Then we are in real trouble. Don't even think about it.

VM induced deadlocks are real nasty.  I have thought about them a lot
already.  Suspend shouldn't introduce any big surprises.

Miklos
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