[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20070416111026.GA22116@infradead.org>
Date: Mon, 16 Apr 2007 12:10:26 +0100
From: Christoph Hellwig <hch@...radead.org>
To: Pavel Emelianov <xemul@...ru>
Cc: Christoph Hellwig <hch@...radead.org>, sct@...hat.com,
akpm@...ux-foundation.org, linux-ext4@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
devel@...nvz.org
Subject: Re: [PATCH] Check for error returned by kthread_create on creating journal thread
On Mon, Apr 16, 2007 at 03:10:42PM +0400, Pavel Emelianov wrote:
> Christoph Hellwig wrote:
> > On Mon, Apr 16, 2007 at 11:41:14AM +0400, Pavel Emelianov wrote:
> >> If the thread failed to create the subsequent wait_event
> >> will hang forever.
> >>
> >> This is likely to happen if kernel hits max_threads limit.
> >>
> >> Will be critical for virtualization systems that limit the
> >> number of tasks and kernel memory usage within the container.
> >
> >> --- ./fs/jbd/journal.c.jbdthreads 2007-04-16 11:17:36.000000000 +0400
> >> +++ ./fs/jbd/journal.c 2007-04-16 11:30:09.000000000 +0400
> >> @@ -211,10 +211,16 @@ end_loop:
> >> return 0;
> >> }
> >>
> >> -static void journal_start_thread(journal_t *journal)
> >> +static int journal_start_thread(journal_t *journal)
> >> {
> >> - kthread_run(kjournald, journal, "kjournald");
> >> + struct task_struct *t;
> >> +
> >> + t = kthread_run(kjournald, journal, "kjournald");
> >> + if (IS_ERR(t))
> >> + return PTR_ERR(t);
> >> +
> >> wait_event(journal->j_wait_done_commit, journal->j_task != 0);
> >
> > Note that this wait_event should exist at all, and the return
>
> Should NOT you mean?
Umm, yes - of course :)
> > value of kthread_run should be assigned to journal->j_task. Also
> > the code doesn't use the kthread primitives in other places leading
> > to crufty code.
>
> Well, this could be done with a separate patch, I think.
-
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists