From: Dave Jones <davej@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Tejun Heo <tj@kernel.org>
Subject: Re: excessive kworker activity when idle. (was Re: vma corruption in today's -git)
Date: Thu, 31 Mar 2011 11:49:42 -0400 [thread overview]
Message-ID: <20110331154941.GA32045@redhat.com> (raw)
In-Reply-To: <AANLkTimAGbzYe7PNG1xhjsA12zErpRasTso711cq8UHq@mail.gmail.com>
On Thu, Mar 31, 2011 at 08:25:36AM -0700, Linus Torvalds wrote:
> On Thu, Mar 31, 2011 at 8:03 AM, Dave Jones <davej@redhat.com> wrote:
> > On Thu, Mar 31, 2011 at 10:58:50AM -0400, Dave Jones wrote:
> >
> > bah I missed a level. which seems to be the smoking gun.
> > something in the tty layer seems to have gone nuts.
>
> Ahhah. That is indeed the smoking gun.
>
> I bet it's an old problem where something causes some stupid tty
> ping-pong behaviour, and now it has become a high-CPU thing triggered
> by commit f23eb2b2b285 ("tty: stop using "delayed_work" in the tty
> layer").
>
> Before that commit, if the tty layer got somehow confused, it would
> always delay for a timer tick in between doing nothing. Now it will go
> pretty much full blast. Which explains your CPU being hot.
That's a recent change though, and I first saw this back in November.
Dave
next prev parent reply other threads:[~2011-03-31 15:50 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-29 4:09 vma corruption in today's -git Dave Jones
2011-03-29 4:19 ` Américo Wang
2011-03-29 4:26 ` Dave Jones
2011-03-29 4:22 ` Linus Torvalds
2011-03-31 3:09 ` excessive kworker activity when idle. (was Re: vma corruption in today's -git) Dave Jones
2011-03-31 3:34 ` Dave Jones
2011-03-31 3:44 ` Linus Torvalds
2011-03-31 4:08 ` Dave Jones
2011-03-31 15:53 ` Linus Torvalds
2011-03-31 16:21 ` Linus Torvalds
2011-03-31 21:38 ` Linus Torvalds
2011-03-31 14:59 ` Paul E. McKenney
2011-03-31 3:37 ` Linus Torvalds
2011-03-31 3:55 ` Dave Jones
2011-03-31 5:32 ` Linus Torvalds
2011-03-31 14:21 ` Arnaldo Carvalho de Melo
2011-03-31 14:58 ` Dave Jones
2011-03-31 15:03 ` Dave Jones
2011-03-31 15:09 ` Dave Jones
2011-03-31 15:45 ` Linus Torvalds
2011-03-31 15:25 ` Linus Torvalds
2011-03-31 15:49 ` Dave Jones [this message]
2011-03-31 15:58 ` Linus Torvalds
2011-03-31 16:13 ` Dave Jones
2011-03-31 6:56 ` Tejun Heo
2011-03-31 10:37 ` [PATCH] workqueue: document debugging tricks Florian Mickler
2011-03-31 11:41 ` Tejun Heo
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