From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Paul Walmsley <paul@pwsan.com>
Cc: "Bruce, Becky" <bbruce@ti.com>,
"Paul E. McKenney" <paul.mckenney@linaro.org>,
"<linux-kernel@vger.kernel.org>" <linux-kernel@vger.kernel.org>,
"<linux-omap@vger.kernel.org>" <linux-omap@vger.kernel.org>,
"<linux-arm-kernel@lists.infradead.org>"
<linux-arm-kernel@lists.infradead.org>,
"Hilman, Kevin" <khilman@ti.com>,
"Shilimkar, Santosh" <santosh.shilimkar@ti.com>,
"Hunter, Jon" <jon-hunter@ti.com>,
"<snijsure@grid-net.com>" <snijsure@grid-net.com>
Subject: Re: rcu self-detected stall messages on OMAP3, 4 boards
Date: Mon, 24 Sep 2012 15:00:23 -0700 [thread overview]
Message-ID: <20120924220023.GG2477@linux.vnet.ibm.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1209242142490.4521@utopia.booyaka.com>
On Mon, Sep 24, 2012 at 09:54:00PM +0000, Paul Walmsley wrote:
> On Sat, 22 Sep 2012, Paul E. McKenney wrote:
>
> > On Sat, Sep 22, 2012 at 10:20:19PM +0000, Paul Walmsley wrote:
> > > On Sat, 22 Sep 2012, Paul E. McKenney wrote:
> > >
> > > > This thing has been in the kernel since about 2004, not sure why you
> > > > didn't hit it earlier.
> > >
> > > One other data point in that regard - noticed the warnings don't appear
> > > when the board is booted with:
> > >
> > > commit 4fa3b6cb1bc8c14b81b4c8ffdfd3f2500a7e9367
> > > Author: Paul E. McKenney <paul.mckenney@linaro.org>
> > > Date: Tue Jun 5 15:53:53 2012 -0700
> > >
> > > rcu: Fix qlen_lazy breakage
> >
> > You lost me on this one. This is already in mainline, so if you were
> > using (say) 3.6-rc6, you would already have this commit applied.
>
> If I check out a kernel at this commit
> 4fa3b6cb1bc8c14b81b4c8ffdfd3f2500a7e9367 + the
> zero-callback-in-tickless-idle diagnostic patch, build and boot it, then
> the stall warnings don't appear (in 25 minutes of testing).
>
> Messages from the diagnostic patch indicate that the kernel is entering
> idle during a grace period with no RCU callbacks, though.
>
> This is not a big deal and does not need any further attention. Just
> wanted to place a time boundary on the point when these messages started
> appearing. (It is unlikely to be an optimal bound: i.e., there are
> probably later commits where the warnings also don't appear.)
Ah, got it, thank you!
Thanx, Paul
WARNING: multiple messages have this Message-ID (diff)
From: paulmck@linux.vnet.ibm.com (Paul E. McKenney)
To: linux-arm-kernel@lists.infradead.org
Subject: rcu self-detected stall messages on OMAP3, 4 boards
Date: Mon, 24 Sep 2012 15:00:23 -0700 [thread overview]
Message-ID: <20120924220023.GG2477@linux.vnet.ibm.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1209242142490.4521@utopia.booyaka.com>
On Mon, Sep 24, 2012 at 09:54:00PM +0000, Paul Walmsley wrote:
> On Sat, 22 Sep 2012, Paul E. McKenney wrote:
>
> > On Sat, Sep 22, 2012 at 10:20:19PM +0000, Paul Walmsley wrote:
> > > On Sat, 22 Sep 2012, Paul E. McKenney wrote:
> > >
> > > > This thing has been in the kernel since about 2004, not sure why you
> > > > didn't hit it earlier.
> > >
> > > One other data point in that regard - noticed the warnings don't appear
> > > when the board is booted with:
> > >
> > > commit 4fa3b6cb1bc8c14b81b4c8ffdfd3f2500a7e9367
> > > Author: Paul E. McKenney <paul.mckenney@linaro.org>
> > > Date: Tue Jun 5 15:53:53 2012 -0700
> > >
> > > rcu: Fix qlen_lazy breakage
> >
> > You lost me on this one. This is already in mainline, so if you were
> > using (say) 3.6-rc6, you would already have this commit applied.
>
> If I check out a kernel at this commit
> 4fa3b6cb1bc8c14b81b4c8ffdfd3f2500a7e9367 + the
> zero-callback-in-tickless-idle diagnostic patch, build and boot it, then
> the stall warnings don't appear (in 25 minutes of testing).
>
> Messages from the diagnostic patch indicate that the kernel is entering
> idle during a grace period with no RCU callbacks, though.
>
> This is not a big deal and does not need any further attention. Just
> wanted to place a time boundary on the point when these messages started
> appearing. (It is unlikely to be an optimal bound: i.e., there are
> probably later commits where the warnings also don't appear.)
Ah, got it, thank you!
Thanx, Paul
next prev parent reply other threads:[~2012-09-24 22:00 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-12 22:51 rcu self-detected stall messages on OMAP3, 4 boards Paul Walmsley
2012-09-12 22:51 ` Paul Walmsley
2012-09-13 1:12 ` Paul E. McKenney
2012-09-13 1:12 ` Paul E. McKenney
2012-09-13 18:52 ` Paul Walmsley
2012-09-13 18:52 ` Paul Walmsley
2012-09-20 0:03 ` Paul E. McKenney
2012-09-20 0:03 ` Paul E. McKenney
2012-09-20 0:03 ` Paul E. McKenney
2012-09-20 7:56 ` Paul Walmsley
2012-09-20 7:56 ` Paul Walmsley
2012-09-20 15:03 ` Bruce, Becky
2012-09-20 15:03 ` Bruce, Becky
2012-09-20 21:49 ` Bruce, Becky
2012-09-20 21:49 ` Bruce, Becky
2012-09-20 22:01 ` Paul E. McKenney
2012-09-20 22:01 ` Paul E. McKenney
2012-09-20 22:01 ` Paul E. McKenney
2012-09-20 22:47 ` Paul Walmsley
2012-09-20 22:47 ` Paul Walmsley
2012-09-20 23:21 ` Paul E. McKenney
2012-09-20 23:21 ` Paul E. McKenney
2012-09-20 23:21 ` Paul E. McKenney
2012-09-21 18:08 ` Paul Walmsley
2012-09-21 18:08 ` Paul Walmsley
2012-09-21 18:58 ` Paul E. McKenney
2012-09-21 18:58 ` Paul E. McKenney
2012-09-21 19:11 ` Paul Walmsley
2012-09-21 19:11 ` Paul Walmsley
2012-09-21 19:57 ` Paul E. McKenney
2012-09-21 19:57 ` Paul E. McKenney
2012-09-21 20:31 ` Tony Lindgren
2012-09-21 20:31 ` Tony Lindgren
2012-09-21 22:03 ` Paul E. McKenney
2012-09-21 22:03 ` Paul E. McKenney
2012-09-22 15:45 ` Frederic Weisbecker
2012-09-22 15:45 ` Frederic Weisbecker
2012-09-22 16:00 ` Paul E. McKenney
2012-09-22 16:00 ` Paul E. McKenney
2012-09-21 22:12 ` Paul E. McKenney
2012-09-21 22:12 ` Paul E. McKenney
2012-09-22 18:42 ` Paul Walmsley
2012-09-22 18:42 ` Paul Walmsley
2012-09-22 20:10 ` Paul E. McKenney
2012-09-22 20:10 ` Paul E. McKenney
2012-09-22 21:59 ` Paul E. McKenney
2012-09-22 21:59 ` Paul E. McKenney
2012-09-22 22:25 ` Paul Walmsley
2012-09-22 22:25 ` Paul Walmsley
2012-09-22 23:11 ` Paul E. McKenney
2012-09-22 23:11 ` Paul E. McKenney
2012-09-22 23:11 ` Paul E. McKenney
2012-09-23 7:55 ` Paul Walmsley
2012-09-23 7:55 ` Paul Walmsley
2012-09-23 7:55 ` Paul Walmsley
2012-09-23 12:11 ` Paul E. McKenney
2012-09-23 12:11 ` Paul E. McKenney
2012-09-23 12:11 ` Paul E. McKenney
2012-09-23 1:42 ` Paul Walmsley
2012-09-23 1:42 ` Paul Walmsley
2012-09-23 1:56 ` Paul E. McKenney
2012-09-23 1:56 ` Paul E. McKenney
2012-09-23 1:56 ` Paul E. McKenney
2012-09-23 2:01 ` Paul Walmsley
2012-09-23 2:01 ` Paul Walmsley
2012-09-24 9:41 ` Shilimkar, Santosh
2012-09-24 9:41 ` Shilimkar, Santosh
2012-09-24 13:18 ` Paul E. McKenney
2012-09-24 13:18 ` Paul E. McKenney
2012-10-01 8:55 ` Linus Walleij
2012-10-01 8:55 ` Linus Walleij
2012-10-01 13:28 ` Paul E. McKenney
2012-10-01 13:28 ` Paul E. McKenney
2012-09-21 18:59 ` Paul Walmsley
2012-09-21 18:59 ` Paul Walmsley
2012-09-21 17:47 ` Paul Walmsley
2012-09-21 17:47 ` Paul Walmsley
2012-09-21 17:51 ` Paul Walmsley
2012-09-21 17:51 ` Paul Walmsley
2012-09-21 21:20 ` Paul E. McKenney
2012-09-21 21:20 ` Paul E. McKenney
2012-09-21 21:20 ` Paul E. McKenney
2012-09-21 22:41 ` Paul Walmsley
2012-09-21 22:41 ` Paul Walmsley
2012-09-22 0:05 ` Paul E. McKenney
2012-09-22 0:05 ` Paul E. McKenney
2012-09-22 18:16 ` Paul Walmsley
2012-09-22 18:16 ` Paul Walmsley
2012-09-22 18:16 ` Paul Walmsley
2012-09-22 19:52 ` Paul E. McKenney
2012-09-22 19:52 ` Paul E. McKenney
2012-09-22 19:52 ` Paul E. McKenney
2012-09-22 22:20 ` Paul Walmsley
2012-09-22 22:20 ` Paul Walmsley
2012-09-22 22:20 ` Paul Walmsley
2012-09-22 23:17 ` Paul E. McKenney
2012-09-22 23:17 ` Paul E. McKenney
2012-09-24 21:54 ` Paul Walmsley
2012-09-24 21:54 ` Paul Walmsley
2012-09-24 22:00 ` Paul E. McKenney [this message]
2012-09-24 22:00 ` Paul E. McKenney
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