From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Dave Jones <davej@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, kosaki.motohiro@gmail.com, walken@google.com,
akpm@linux-foundation.org, torvalds@linux-foundation.org
Subject: Re: mlockall triggred rcu_preempt stall.
Date: Tue, 30 Jul 2013 10:57:18 -0700 [thread overview]
Message-ID: <20130730175718.GA8957@linux.vnet.ibm.com> (raw)
In-Reply-To: <20130720003212.GA31308@redhat.com>
On Fri, Jul 19, 2013 at 08:32:12PM -0400, Dave Jones wrote:
> On Fri, Jul 19, 2013 at 03:15:39PM -0700, Paul E. McKenney wrote:
> > On Fri, Jul 19, 2013 at 10:53:23AM -0400, Dave Jones wrote:
> > > My fuzz tester keeps hitting this. Every instance shows the non-irq stack
> > > came in from mlockall. I'm only seeing this on one box, but that has more
> > > ram (8gb) than my other machines, which might explain it.
> >
> > Are you building CONFIG_PREEMPT=n? I don't see any preemption points in
> > do_mlockall(), so a range containing enough vmas might well stall the
> > CPU in that case.
>
> That was with full preempt.
>
> > Does the patch below help? If so, we probably need others, but let's
> > first see if this one helps. ;-)
>
> I'll try it on Monday.
Any news? If I don't hear otherwise, I will assume that the patch did
not help, and will therefore drop it.
Thanx, Paul
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WARNING: multiple messages have this Message-ID (diff)
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Dave Jones <davej@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, kosaki.motohiro@gmail.com, walken@google.com,
akpm@linux-foundation.org, torvalds@linux-foundation.org
Subject: Re: mlockall triggred rcu_preempt stall.
Date: Tue, 30 Jul 2013 10:57:18 -0700 [thread overview]
Message-ID: <20130730175718.GA8957@linux.vnet.ibm.com> (raw)
In-Reply-To: <20130720003212.GA31308@redhat.com>
On Fri, Jul 19, 2013 at 08:32:12PM -0400, Dave Jones wrote:
> On Fri, Jul 19, 2013 at 03:15:39PM -0700, Paul E. McKenney wrote:
> > On Fri, Jul 19, 2013 at 10:53:23AM -0400, Dave Jones wrote:
> > > My fuzz tester keeps hitting this. Every instance shows the non-irq stack
> > > came in from mlockall. I'm only seeing this on one box, but that has more
> > > ram (8gb) than my other machines, which might explain it.
> >
> > Are you building CONFIG_PREEMPT=n? I don't see any preemption points in
> > do_mlockall(), so a range containing enough vmas might well stall the
> > CPU in that case.
>
> That was with full preempt.
>
> > Does the patch below help? If so, we probably need others, but let's
> > first see if this one helps. ;-)
>
> I'll try it on Monday.
Any news? If I don't hear otherwise, I will assume that the patch did
not help, and will therefore drop it.
Thanx, Paul
next prev parent reply other threads:[~2013-07-30 17:57 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-19 14:53 mlockall triggred rcu_preempt stall Dave Jones
2013-07-19 14:53 ` Dave Jones
2013-07-19 22:15 ` Paul E. McKenney
2013-07-19 22:15 ` Paul E. McKenney
2013-07-20 0:32 ` Dave Jones
2013-07-20 0:32 ` Dave Jones
2013-07-20 14:00 ` Paul E. McKenney
2013-07-20 14:00 ` Paul E. McKenney
2013-07-30 17:57 ` Paul E. McKenney [this message]
2013-07-30 17:57 ` Paul E. McKenney
2013-07-30 18:05 ` Dave Jones
2013-07-30 18:05 ` Dave Jones
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