linux-kernel - Re: [RFC 5/5] pm: remove kernel thread freezing

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Message-ID: <20171003205739.GA30569@amd>
Date:   Tue, 3 Oct 2017 22:57:40 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>, viro@...iv.linux.org.uk,
        bart.vanassche@....com, ming.lei@...hat.com, tytso@....edu,
        darrick.wong@...cle.com, rjw@...ysocki.net, len.brown@...el.com,
        linux-fsdevel@...r.kernel.org, boris.ostrovsky@...cle.com,
        jgross@...e.com, todd.e.brandt@...ux.intel.com, nborisov@...e.com,
        jack@...e.cz, martin.petersen@...cle.com, ONeukum@...e.com,
        oleksandr@...alenko.name, oleg.b.antonyan@...il.com,
        linux-pm@...r.kernel.org, linux-block@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 5/5] pm: remove kernel thread freezing

On Tue 2017-10-03 22:38:33, Jiri Kosina wrote:
> On Tue, 3 Oct 2017, Pavel Machek wrote:
> 
> > > This point I don't understand. What exactly do you mean?
> > 
> > Hibernation:
> > 
> > We freeze, do system snapshot, unfreeze, and write image to
> > disk. 
> 
> Where/why do you unfreeze between creating the snapshot and writing it 
> out?

Yep, sorry, we don't unfreeze.

> Again, I agree that the (rare) kthreads that are actually "creating" new 
> I/O have to be somehow frozen and require special care.

Agreed. Was any effort made to identify those special kernel threads?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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