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

Matthew Garrett
2007-07-03T16:05:26Z

On Tue, Jul 03, 2007 at 12:03:33PM -0400, Alan Stern wrote:
> 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

For the suspend to RAM case, that sounds absolutely fine.

--
Matthew Garrett | mjg59@srcf.ucam.org