From: "Paul E. McKenney" <paulmck@linux•vnet.ibm.com>
To: Gabriel Paubert <paubert@iram•es>
Cc: linuxppc-dev@lists•ozlabs.org, paulus@samba•org,
Anton Blanchard <anton@samba•org>
Subject: Re: [PATCH] powerpc: irq work racing with timer interrupt can result in timer interrupt hang
Date: Fri, 9 May 2014 15:08:45 -0700 [thread overview]
Message-ID: <20140509220845.GY8754@linux.vnet.ibm.com> (raw)
In-Reply-To: <20140509215005.GA28239@visitor2.iram.es>
On Fri, May 09, 2014 at 11:50:05PM +0200, Gabriel Paubert wrote:
> On Fri, May 09, 2014 at 06:41:13AM -0700, Paul E. McKenney wrote:
> > On Fri, May 09, 2014 at 05:47:12PM +1000, Anton Blanchard wrote:
> > > I am seeing an issue where a CPU running perf eventually hangs.
> > > Traces show timer interrupts happening every 4 seconds even
> > > when a userspace task is running on the CPU.
> >
> > Is this by chance every 4.2 seconds? The reason I ask is that
> > Paul Clarke and I are seeing an interrupt every 4.2 seconds when
> > he runs NO_HZ_FULL, and are trying to get rid of it. ;-)
>
> Hmmm, it's close to 2^32 nanoseconds, isnt't it suspiscious?
Now that you mention it... ;-)
So you are telling me that we are not succeeding in completely turning
off the decrementer interrupt?
Thanx, Paul
next prev parent reply other threads:[~2014-05-09 22:08 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-09 7:47 [PATCH] powerpc: irq work racing with timer interrupt can result in timer interrupt hang Anton Blanchard
2014-05-09 9:52 ` Preeti U Murthy
2014-05-10 4:26 ` Benjamin Herrenschmidt
2014-05-10 15:36 ` Preeti U Murthy
2014-05-10 22:25 ` Benjamin Herrenschmidt
2014-05-11 8:15 ` Preeti U Murthy
2014-05-11 8:37 ` Benjamin Herrenschmidt
2014-05-11 8:43 ` Preeti U Murthy
2014-05-11 9:03 ` Benjamin Herrenschmidt
2014-05-11 9:07 ` Preeti U Murthy
2014-05-09 13:41 ` Paul E. McKenney
2014-05-09 21:50 ` Gabriel Paubert
2014-05-09 22:08 ` Paul E. McKenney [this message]
2014-05-10 6:33 ` Paul Mackerras
2014-05-10 16:33 ` Paul E. McKenney
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