linux-kernel - Re: Getting rid of freezer for suspend [was Re: [fuse-devel] [PATCH] fuse: make fuse daemon frozen along with kernel threads]

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Message-ID: <20130219104633.GA23279@xo-6d-61-c0.localdomain>
Date:	Tue, 19 Feb 2013 11:46:33 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Li, Fei" <fei.li@...el.com>, Miklos Szeredi <miklos@...redi.hu>,
	Goswin von Brederlow <goswin-v-b@....de>,
	"Brown, Len" <len.brown@...el.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"Wang, Biao" <biao.wang@...el.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"fuse-devel@...ts.sourceforge.net" <fuse-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Liu, Chuansheng" <chuansheng.liu@...el.com>
Subject: Re: Getting rid of freezer for suspend [was Re: [fuse-devel] [PATCH]
 fuse: make fuse daemon frozen along with kernel threads]

Hi!

> > > > > Well, I suppose that information is available to user space.
> > > > >
> > > > > Do we need an interface for a process to mark itself as PF_FREEZE_LATE or
> > > > > do we need an interface for one process to mark another process as
> > > > > PF_FREEZE_LATE, or both?
> > > >
> > > > As a first step marking self with PF_FREEZE_LATE and inheriting this
> > > > flag across fork/clone would work for most cases, I think.
> > > 
> > > OK, so we can just have a switch for that in /proc I suppose.
> > 
> > Thanks for feedback and suggestion.
> > 
> > We have ever tried similar idea, expose interface /sys/power/pm_freeze_daemon,
> > userspace tasks write 1 to this attribute to make itself to be frozen at the same time
> > with kernel tasks, and it worked in our experiment.
> > 
> > Do you think it's suitable and enough to use such attribute /sys/power/pm_freeze_late, 
> > or other more suitable place under /proc suggested?
> 
> I think it should be inder /proc, because that's where controls related to
> process behavior are located.  E.g. /proc/PID/freeze_late or something like
> that.

freeze_priority?

I _hope_ we will not need more than three priorities, (user, fused, kernel), but 
I hoped not no need more than two before, so...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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