linux-kernel - Re: [linux-pm] Is it supposed to be ok to call del

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Message-ID: <20100301063508.GA1455@ucw.cz>
Date:	Mon, 1 Mar 2010 07:35:08 +0100
From:	Pavel Machek <pavel@....cz>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [linux-pm] Is it supposed to be ok to call del_gendisk while
	userspace is frozen?

Hi!

> > > This is a matter for Jens.  Is the bdi writeback task freezable?  If it
> > > is, should it be made unfreezable?
> > 
> > I'm not a big expect on what tasks should be freezable or not. As it
> > stands, the writeback tasks will attempt to freeze and thaw with the
> > system. I guess that screws the sync from resume call, since it's not
> > running and the sync will wait for it to retrieve and finish that work
> > item.
> > 
> > To the suspend experts - can we safely mark the writeback tasks as
> > non-freezable?
> 
> The reason for freezing those tasks is to avoid writebacks at random
> times during a system sleep transition, when the underlying device may
> already be suspended, right?

It is also there to avoid inconsistency between in-filesystem data and
snapshot in hibernation image.

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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