From: Pavel Machek <pavel@ucw.cz>
To: nigel@suspend2.net
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
pm list <linux-pm@lists.linux-foundation.org>,
Alan Stern <stern@rowland.harvard.edu>,
LKML <linux-kernel@vger.kernel.org>,
Oliver Neukum <oliver@neukum.org>,
Miklos Szeredi <miklos@szeredi.hu>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Matthew Garrett <mjg59@srcf.ucam.org>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: [RFC][PATCH -mm] Freezer: Handle uninterruptible tasks
Date: Sat, 7 Jul 2007 13:31:18 +0200 [thread overview]
Message-ID: <20070707113118.GA2789@elf.ucw.cz> (raw)
In-Reply-To: <200707071913.43482.nigel@nigel.suspend2.net>
Hi!
> > I don't think we can do that. I suspect rename looks like:
> >
> > write directory entry in source
> > A) (uninterruptible wait for write)
> > write directory entry in destination
> > (uninterruptible wait for write)
> > write something else
> >
> > If we freeze some task in place "A)", we'll write to the disk when the
> > directory write is finished :-(.
>
> Renaming is a single syscall, so won't the process get frozen when the syscall
> finishes?
It would be frozen when syscall finishes. But if we freeze it at A)
point, we have a problem.
> Perhaps you've just found more logic for keeping the sys_sync there?
No, I don't think so.
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:[~2007-07-07 11:56 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-06 8:12 Rafael J. Wysocki
2007-07-06 15:01 ` Alan Stern
2007-07-07 23:08 ` Rafael J. Wysocki
2007-07-08 12:09 ` Pavel Machek
2007-07-08 13:55 ` Rafael J. Wysocki
2007-07-09 4:21 ` Jeremy Maitin-Shepard
2007-07-09 14:45 ` Alan Stern
2007-07-09 15:36 ` Jeremy Maitin-Shepard
2007-07-08 18:37 ` Pavel Machek
2007-07-07 7:50 ` Pavel Machek
2007-07-07 9:13 ` Nigel Cunningham
2007-07-07 11:31 ` Pavel Machek [this message]
2007-07-07 20:44 ` Rafael J. Wysocki
2007-07-06 20:26 Oleg Nesterov
2007-07-06 22:38 ` Oliver Neukum
2007-07-06 23:00 ` Rafael J. Wysocki
2007-07-07 23:08 ` Rafael J. Wysocki
2007-07-06 22:56 ` Rafael J. Wysocki
2007-07-06 23:46 ` Nigel Cunningham
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