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

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Message-ID: <20171003202121.GB23521@amd>
Date:   Tue, 3 Oct 2017 22:21:21 +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

Hi!

> > Can memory management doing background writes be a problem?
> 
> This point I don't understand. What exactly do you mean?

Hibernation:

We freeze, do system snapshot, unfreeze, and write image to
disk. Memory management wakes up (this used to be called bdflush),
decides its time to write some dirty data back to disk. Powerdown.

But state on the disk now does not correspond to what the image
expects. Problem?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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