From: Pavel Machek <pavel@ucw.cz>
To: Jeff Layton <jlayton@redhat.com>
Cc: trond.myklebust@netapp.com, smfrench@gmail.com, rjw@sisk.pl,
linux-pm@lists.linux-foundation.org, linux-cifs@vger.kernel.org,
linux-nfs@vger.kernel.org, john@Calva.COM,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/4] allow freezing of tasks with netfs calls in flight
Date: Tue, 11 Oct 2011 08:18:19 +0200 [thread overview]
Message-ID: <20111011061819.GA1377@ucw.cz> (raw)
In-Reply-To: <1317210761-11518-1-git-send-email-jlayton@redhat.com>
Hi!
> We've had a number of reports recently of people with NFS and CIFS
> mounts that were unable to suspend or hibernate their machines. Here
> are a couple of Fedora bugs that illustrate the problem:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=712088
> https://bugzilla.redhat.com/show_bug.cgi?id=717735
>
> When it occurs the problem is pretty clear. We have a task that's
> sleeping in the kernel in TASK_KILLABLE sleep, generally waiting
> for a reply to come in. Often though, userspace has already taken
> down the interface so that reply will never come. The process then
> fails to freeze and the suspend fails.
Userspace should not take interface down for suspend (*). Why do that?
> This patch fixes this by allowing the TASK_KILLABLE sleeps in NFS and
> CIFS to be awoken by the freezer and then to try to freeze. If a freeze
> event does occur, then the code will treat it as if a schedule() has
> already occured.
Looks like good idea...
(*) unless absolutely neccessary. openvpn?
--
(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:[~2011-10-11 6:18 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-28 11:52 [PATCH 0/4] allow freezing of tasks with netfs calls in flight Jeff Layton
2011-09-28 11:52 ` [PATCH 1/4] freezer: make fake_signal_wake_up wake TASK_KILLABLE tasks too Jeff Layton
2011-10-11 6:18 ` Pavel Machek
2011-10-11 10:10 ` Jeff Layton
2011-10-11 19:14 ` Rafael J. Wysocki
2011-10-26 19:55 ` Jeff Layton
2011-10-27 20:21 ` Rafael J. Wysocki
2011-10-27 20:22 ` [linux-pm] " Rafael J. Wysocki
2011-10-27 20:26 ` Steve French
2011-09-28 11:52 ` [PATCH 2/4] cifs, freezer: add wait_event_freezekillable and have cifs use it Jeff Layton
2011-09-29 4:28 ` Steve French
2011-09-29 10:41 ` Jeff Layton
2011-09-29 16:39 ` Steve French
2011-09-29 17:29 ` Jeff Layton
2011-09-28 11:52 ` [PATCH 3/4] sunrpc: make rpc_wait_bit_killable handle freeze events Jeff Layton
2011-10-11 6:19 ` Pavel Machek
2011-10-11 10:12 ` Jeff Layton
2011-10-11 12:52 ` Myklebust, Trond
2011-10-11 13:14 ` Jeff Layton
2011-09-28 11:52 ` [PATCH 4/4] nfs: make TASK_KILLABLE sleeps attempt to freeze Jeff Layton
2011-10-19 15:18 ` [PATCH 4/4] nfs: make TASK_KILLABLE sleeps attempt to freeze (try #2) Jeff Layton
2011-10-11 6:18 ` Pavel Machek [this message]
2011-10-11 10:05 ` [PATCH 0/4] allow freezing of tasks with netfs calls in flight Jeff Layton
2011-10-11 19:19 ` Rafael J. Wysocki
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