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

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Message-Id: <200707032325.41952.rjw@sisk.pl>
Date:	Tue, 3 Jul 2007 23:25:41 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Nigel Cunningham <nigel@...el.suspend2.net>
Subject: Re: [PATCH] Remove process freezer from suspend to RAM pathway

On Tuesday, 3 July 2007 21:27, Pavel Machek wrote:
> Hi!
> 
> > > > The main reason for deadlocks is because we do a sys_sync() after the
> > > > freeze, which we shouldn't do.
> > > 
> > > So why don't we remove the sys_sync() from freeze_processes() instead?
> > 
> > The patch follows (untested).
> > 
> > Greetings,
> > Rafael
> > 
> > 
> > ---
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > 
> > We shouldn't sync filesystems from within the freezer, because it's not needed
> > for suspend to RAM and leads to problems with FUSE.
> 
> Actually... It is not _needed_ for suspend to disk, either. Snapshot is
> atomic, so it should be okay to suspend with filesystems dirty.
> 
> _But_, if anything goes wrong, we'd prefer to have at least
> filesystems synced. Battery running out during s2ram is not quite
> uncommon, so we perhaps should do sync somewhere there. (But we can do
> it before freezer just fine).

OK

So, should I add the sync() to suspend_prepare(), before freeze_processes()
(in analogy with hibernate())?

Greetings
Rafael


-- 
"Premature optimization is the root of all evil." - Donald Knuth
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