Messages in this thread | | | Date | Tue, 11 Oct 2011 08:18:19 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH 0/4] allow freezing of tasks with netfs calls in flight |
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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
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