linux-kernel - Re: [RFC][PATCH -mm] PM: Do not sync from within the freezer during suspend to RAM

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Date:	Thu, 5 Jul 2007 00:49:42 +0200
From:	Pavel Machek <pavel@....cz>
To:	Nigel Cunningham <nigel@...el.suspend2.net>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Oliver Neukum <oliver@...kum.org>,
	Paul Mackerras <paulus@...ba.org>,
	Miklos Szeredi <miklos@...redi.hu>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC][PATCH -mm] PM: Do not sync from within the freezer during suspend to RAM

On Thu 2007-07-05 08:48:15, Nigel Cunningham wrote:
> Hi.
> 
> On Thursday 05 July 2007 00:58:58 Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > 
> > The syncing of filesystems from within the freezer in not needed for suspend 
> to
> > RAM.  Change freeze_processes() so that it doesn't execute sys_sync() and
> > introduce the "syncing" version of it to be called from the hibernation code
> > paths.
> > 
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > ---
> >  include/linux/freezer.h |   14 ++++++++++++--
> >  kernel/power/disk.c     |    2 +-
> >  kernel/power/main.c     |    6 ++++++
> >  kernel/power/process.c  |    8 +++++---
> >  kernel/power/user.c     |    2 +-
> >  5 files changed, 25 insertions(+), 7 deletions(-)
> 
> Looks ok, except that I wonder if you want the following fragment. It looks to 
> me (looking at rc6) like with this code, you'll currently call sys_sync twice 
> when suspending to ram. Maybe I'm misreading it. Also, shouldn't it be done 
> after taking the mutex?

sys_sync() should be okay to call, mutex or not.
									Pavel



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