From: Pavel Machek <pavel@ucw.cz>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: nigel@nigel.suspend2.net, rjw@sisk.pl, a1426z@gawab.com,
jeremy@goop.org, jbms@cmu.edu, nickpiggin@yahoo.com.au,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org
Subject: Re: Hibernation Redesign
Date: Thu, 12 Jul 2007 11:15:53 +0200 [thread overview]
Message-ID: <20070712091553.GC1866@elf.ucw.cz> (raw)
In-Reply-To: <E1I8b0l-0000DB-00@dorka.pomaz.szeredi.hu>
Hi!
> > > Freezing of tasks is slowing down suspend. Don't know how serious
> > > this is, suspend is pretty fast, but could possibly be even faster.
> >
> > It's FUD. Freezing of tasks normally takes next to no time. I've never
> > understood the rediculously long timeout it has. If freezing succeeds, all
> > processes are frozen within 1/2 a second tops. If it fails, nothing is going
> > to change in the following 19.5 seconds (or whatever it is if I don't
> > remember the value properly).
>
> Right. The 20s timeout is again a sign of brokenness.
Well, "scenario 1/2 - simple/tricky deadlock" is a sign of brokenness,
too.
> If we expect something to fail, it should fail immediately, without
> waiting for arbitrary timeouts.
Agreed that freezer is not nice, but core issue here is that fuse
allows userspace tasks to hold kernel locks... bad.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2007-07-12 20:40 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-08 14:37 Hibernation Redesign (was: malicious filesystems (was Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM) Al Boldi
2007-07-09 4:11 ` Hibernation Redesign Jeremy Maitin-Shepard
2007-07-09 4:29 ` Nick Piggin
2007-07-09 4:36 ` Jeremy Maitin-Shepard
2007-07-09 4:45 ` Nick Piggin
2007-07-09 4:54 ` Jeremy Maitin-Shepard
2007-07-09 4:58 ` Nick Piggin
2007-07-09 5:33 ` Nick Piggin
2007-07-09 6:22 ` Jeremy Fitzhardinge
2007-07-09 13:45 ` Pavel Machek
2007-07-09 14:02 ` Oliver Neukum
2007-07-09 14:26 ` Jeremy Maitin-Shepard
2007-07-09 15:09 ` Oliver Neukum
2007-07-09 15:27 ` Jeremy Maitin-Shepard
2007-07-09 4:39 ` Nick Piggin
2007-07-09 13:52 ` Pavel Machek
2007-07-09 15:30 ` Al Boldi
2007-07-10 1:29 ` Nick Piggin
2007-07-10 2:28 ` Jeremy Maitin-Shepard
2007-07-10 14:57 ` Jeremy Fitzhardinge
2007-07-10 17:25 ` Jeremy Maitin-Shepard
2007-07-10 22:59 ` Jeremy Fitzhardinge
2007-07-11 4:11 ` Al Boldi
2007-07-11 10:27 ` Rafael J. Wysocki
2007-07-11 10:42 ` Miklos Szeredi
2007-07-11 11:04 ` Rafael J. Wysocki
2007-07-11 11:11 ` Miklos Szeredi
2007-07-11 11:50 ` Rafael J. Wysocki
2007-07-11 11:54 ` Miklos Szeredi
2007-07-11 12:00 ` Nigel Cunningham
2007-07-11 12:09 ` Miklos Szeredi
2007-07-11 12:17 ` Nigel Cunningham
2007-07-11 12:27 ` Rafael J. Wysocki
2007-07-11 12:29 ` Miklos Szeredi
2007-07-11 21:04 ` Rafael J. Wysocki
2007-07-12 9:15 ` Pavel Machek [this message]
2007-07-12 22:13 ` Miklos Szeredi
2007-07-11 12:19 ` Rafael J. Wysocki
2007-07-11 12:49 ` Nigel Cunningham
2007-07-11 21:06 ` Rafael J. Wysocki
2007-07-11 12:11 ` Nigel Cunningham
2007-07-11 12:24 ` Miklos Szeredi
2007-07-11 12:46 ` Nigel Cunningham
2007-07-11 12:55 ` Miklos Szeredi
2007-07-11 13:16 ` Jeremy Maitin-Shepard
2007-07-11 20:48 ` Mark Lord
2007-07-11 21:14 ` Rafael J. Wysocki
2007-07-11 22:17 ` Al Boldi
2007-07-11 22:34 ` Rafael J. Wysocki
2007-07-11 23:12 ` Al Boldi
2007-07-11 23:31 ` Nigel Cunningham
2007-07-12 3:11 ` Al Boldi
2007-07-12 13:20 ` Rafael J. Wysocki
2007-07-16 6:04 ` Nick Piggin
2007-07-12 20:29 ` Jeremy Maitin-Shepard
2007-07-11 23:46 ` Nigel Cunningham
2007-07-11 17:55 ` david
2007-07-11 22:54 ` Nigel Cunningham
2007-07-10 17:45 ` Al Boldi
2007-07-10 18:20 ` Jeremy Maitin-Shepard
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