Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sat, May 07, 2016 at 08:25:01AM -0700, Paul E. McKenney wrote: > On Fri, May 06, 2016 at 04:25:16PM +1000, Ross Green wrote: > > On Sun, Apr 3, 2016 at 6:18 PM, Paul E. McKenney > > wrote: [ . . . ] > > Thought i would update a few runs with the linux-4.6-rc kernels. > > > > I have attached

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sun, May 8, 2016 at 1:25 AM, Paul E. McKenney wrote: > On Fri, May 06, 2016 at 04:25:16PM +1000, Ross Green wrote: >> On Sun, Apr 3, 2016 at 6:18 PM, Paul E. McKenney >> wrote: >> > On Thu, Mar 31, 2016 at 08:42:55AM -0700, Paul E. McKenney wrote: >> >> On Wed, Mar 30, 2016 at 07:55:47AM -0700

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Fri, May 06, 2016 at 04:25:16PM +1000, Ross Green wrote: > On Sun, Apr 3, 2016 at 6:18 PM, Paul E. McKenney > wrote: > > On Thu, Mar 31, 2016 at 08:42:55AM -0700, Paul E. McKenney wrote: > >> On Wed, Mar 30, 2016 at 07:55:47AM -0700, Paul E. McKenney wrote: > >> > On Tue, Mar 29, 2016 at 06:49:

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Thu, Mar 31, 2016 at 08:42:55AM -0700, Paul E. McKenney wrote: > On Wed, Mar 30, 2016 at 07:55:47AM -0700, Paul E. McKenney wrote: > > On Tue, Mar 29, 2016 at 06:49:08AM -0700, Paul E. McKenney wrote: > > > On Mon, Mar 28, 2016 at 05:28:14PM -0700, Paul E. McKenney wrote: > > > > On Mon, Mar 28,

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Wed, Mar 30, 2016 at 07:55:47AM -0700, Paul E. McKenney wrote: > On Tue, Mar 29, 2016 at 06:49:08AM -0700, Paul E. McKenney wrote: > > On Mon, Mar 28, 2016 at 05:28:14PM -0700, Paul E. McKenney wrote: > > > On Mon, Mar 28, 2016 at 05:25:18PM -0700, Paul E. McKenney wrote: > > > > On Mon, Mar 28,

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Tue, Mar 29, 2016 at 06:49:08AM -0700, Paul E. McKenney wrote: > On Mon, Mar 28, 2016 at 05:28:14PM -0700, Paul E. McKenney wrote: > > On Mon, Mar 28, 2016 at 05:25:18PM -0700, Paul E. McKenney wrote: > > > On Mon, Mar 28, 2016 at 06:08:41AM -0700, Paul E. McKenney wrote: > > > > On Mon, Mar 28,

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 28, 2016 at 05:28:14PM -0700, Paul E. McKenney wrote: > On Mon, Mar 28, 2016 at 05:25:18PM -0700, Paul E. McKenney wrote: > > On Mon, Mar 28, 2016 at 06:08:41AM -0700, Paul E. McKenney wrote: > > > On Mon, Mar 28, 2016 at 08:25:47AM +0200, Peter Zijlstra wrote: > > > > On Sun, Mar 27, 2

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 28, 2016 at 05:25:18PM -0700, Paul E. McKenney wrote: > On Mon, Mar 28, 2016 at 06:08:41AM -0700, Paul E. McKenney wrote: > > On Mon, Mar 28, 2016 at 08:25:47AM +0200, Peter Zijlstra wrote: > > > On Sun, Mar 27, 2016 at 02:06:41PM -0700, Paul E. McKenney wrote: > > [ . . . ] > > > > >

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 28, 2016 at 06:08:41AM -0700, Paul E. McKenney wrote: > On Mon, Mar 28, 2016 at 08:25:47AM +0200, Peter Zijlstra wrote: > > On Sun, Mar 27, 2016 at 02:06:41PM -0700, Paul E. McKenney wrote: [ . . . ] > > > OK, so I should instrument migration_call() if I get the repro rate up? > > >

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 28, 2016 at 04:12:19PM +, Mathieu Desnoyers wrote: > - On Mar 28, 2016, at 11:56 AM, Paul E. McKenney > paul...@linux.vnet.ibm.com wrote: > > > On Mon, Mar 28, 2016 at 03:07:36PM +, Mathieu Desnoyers wrote: > >> - On Mar 28, 2016, at 9:29 AM, Paul E. McKenney > >> pau

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

- On Mar 28, 2016, at 11:56 AM, Paul E. McKenney paul...@linux.vnet.ibm.com wrote: > On Mon, Mar 28, 2016 at 03:07:36PM +, Mathieu Desnoyers wrote: >> - On Mar 28, 2016, at 9:29 AM, Paul E. McKenney >> paul...@linux.vnet.ibm.com >> wrote: >> >> > On Mon, Mar 28, 2016 at 08:28:51AM +

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 28, 2016 at 03:07:36PM +, Mathieu Desnoyers wrote: > - On Mar 28, 2016, at 9:29 AM, Paul E. McKenney > paul...@linux.vnet.ibm.com wrote: > > > On Mon, Mar 28, 2016 at 08:28:51AM +0200, Peter Zijlstra wrote: > >> On Sun, Mar 27, 2016 at 02:09:14PM -0700, Paul E. McKenney wrote:

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

- On Mar 28, 2016, at 9:29 AM, Paul E. McKenney paul...@linux.vnet.ibm.com wrote: > On Mon, Mar 28, 2016 at 08:28:51AM +0200, Peter Zijlstra wrote: >> On Sun, Mar 27, 2016 at 02:09:14PM -0700, Paul E. McKenney wrote: >> >> > > Does that system have MONITOR/MWAIT errata? >> > >> > On the off

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

- On Mar 28, 2016, at 2:13 AM, Peter Zijlstra pet...@infradead.org wrote: > On Mon, Mar 28, 2016 at 02:23:45AM +, Mathieu Desnoyers wrote: > >> >> But, you need hotplug for this to happen, right? >> > >> > My understanding is that this seems to be detection of failures to be >> > awakene

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 28, 2016 at 08:13:51AM +0200, Peter Zijlstra wrote: > On Mon, Mar 28, 2016 at 02:23:45AM +, Mathieu Desnoyers wrote: > > > >> But, you need hotplug for this to happen, right? > > > > > > My understanding is that this seems to be detection of failures to be > > > awakened for a lon

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 28, 2016 at 08:28:51AM +0200, Peter Zijlstra wrote: > On Sun, Mar 27, 2016 at 02:09:14PM -0700, Paul E. McKenney wrote: > > > > Does that system have MONITOR/MWAIT errata? > > > > On the off-chance that this question was also directed at me, > > Hehe, it wasn't, however, since we're

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 28, 2016 at 08:25:47AM +0200, Peter Zijlstra wrote: > On Sun, Mar 27, 2016 at 02:06:41PM -0700, Paul E. McKenney wrote: > > > > But, you need hotplug for this to happen, right? > > > > I do, but Ross Green is seeing something that looks similar, and without > > CPU hotplug. > > Yes,

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sun, Mar 27, 2016 at 02:09:14PM -0700, Paul E. McKenney wrote: > > Does that system have MONITOR/MWAIT errata? > > On the off-chance that this question was also directed at me, Hehe, it wasn't, however, since we're here.. > here is > what I am running on. I am running in a qemu/KVM virtual

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sun, Mar 27, 2016 at 02:06:41PM -0700, Paul E. McKenney wrote: > > But, you need hotplug for this to happen, right? > > I do, but Ross Green is seeing something that looks similar, and without > CPU hotplug. Yes, but that's two differences so far, you need hotplug and he's on ARM (which doesn

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 28, 2016 at 02:23:45AM +, Mathieu Desnoyers wrote: > >> But, you need hotplug for this to happen, right? > > > > My understanding is that this seems to be detection of failures to be > > awakened for a long time on idle CPUs. It therefore seems to be more > > idle-related than cpu

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

- On Mar 27, 2016, at 9:44 PM, Mathieu Desnoyers mathieu.desnoy...@efficios.com wrote: > - On Mar 27, 2016, at 4:45 PM, Peter Zijlstra pet...@infradead.org wrote: > >> On Sun, Mar 27, 2016 at 08:40:18AM -0700, Paul E. McKenney wrote: >>> Oh, and the patch I am running with is below. I a

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

- On Mar 27, 2016, at 4:45 PM, Peter Zijlstra pet...@infradead.org wrote: > On Sun, Mar 27, 2016 at 08:40:18AM -0700, Paul E. McKenney wrote: >> Oh, and the patch I am running with is below. I am running x86, and so >> some other architectures would of course need the corresponding patch >> o

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sun, Mar 27, 2016 at 10:54:39PM +0200, Peter Zijlstra wrote: > On Mon, Mar 21, 2016 at 09:22:30AM -0700, Jacob Pan wrote: > > > > We're seeing a similar stall (~60 seconds) on an x86 development > > > > system here. Any luck tracking down the cause of this? If not, any > > > > suggestions for

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sun, Mar 27, 2016 at 10:53:18PM +0200, Peter Zijlstra wrote: > On Sun, Mar 27, 2016 at 08:40:18AM -0700, Paul E. McKenney wrote: > > Oh, and the patch I am running with is below. I am running x86, and so > > some other architectures would of course need the corresponding patch > > on that archi

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sun, Mar 27, 2016 at 10:45:59PM +0200, Peter Zijlstra wrote: > On Sun, Mar 27, 2016 at 08:40:18AM -0700, Paul E. McKenney wrote: > > Oh, and the patch I am running with is below. I am running x86, and so > > some other architectures would of course need the corresponding patch > > on that archi

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 21, 2016 at 09:22:30AM -0700, Jacob Pan wrote: > > > We're seeing a similar stall (~60 seconds) on an x86 development > > > system here. Any luck tracking down the cause of this? If not, any > > > suggestions for traces that might be helpful? > +Reinette, she has the system that can

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sun, Mar 27, 2016 at 08:40:18AM -0700, Paul E. McKenney wrote: > Oh, and the patch I am running with is below. I am running x86, and so > some other architectures would of course need the corresponding patch > on that architecture. > -#define TIF_POLLING_NRFLAG 21 /* idle is polling for

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sun, Mar 27, 2016 at 08:40:18AM -0700, Paul E. McKenney wrote: > Oh, and the patch I am running with is below. I am running x86, and so > some other architectures would of course need the corresponding patch > on that architecture. > -#define TIF_POLLING_NRFLAG 21 /* idle is polling for

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sun, Mar 27, 2016 at 08:40:18AM -0700, Paul E. McKenney wrote: > On Sun, Mar 27, 2016 at 01:48:55PM +, Mathieu Desnoyers wrote: > > - On Mar 26, 2016, at 9:34 PM, Paul E. McKenney > > paul...@linux.vnet.ibm.com wrote: > > > On Sat, Mar 26, 2016 at 10:22:57PM +, Mathieu Desnoyers wro

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sun, Mar 27, 2016 at 01:48:55PM +, Mathieu Desnoyers wrote: > - On Mar 26, 2016, at 9:34 PM, Paul E. McKenney > paul...@linux.vnet.ibm.com wrote: > > > On Sat, Mar 26, 2016 at 10:22:57PM +, Mathieu Desnoyers wrote: > >> - On Mar 26, 2016, at 2:49 PM, Paul E. McKenney > >> paul

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

- On Mar 26, 2016, at 9:34 PM, Paul E. McKenney paul...@linux.vnet.ibm.com wrote: > On Sat, Mar 26, 2016 at 10:22:57PM +, Mathieu Desnoyers wrote: >> - On Mar 26, 2016, at 2:49 PM, Paul E. McKenney >> paul...@linux.vnet.ibm.com >> wrote: >> >> > On Sat, Mar 26, 2016 at 08:28:16AM -0

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sat, Mar 26, 2016 at 10:22:57PM +, Mathieu Desnoyers wrote: > - On Mar 26, 2016, at 2:49 PM, Paul E. McKenney > paul...@linux.vnet.ibm.com wrote: > > > On Sat, Mar 26, 2016 at 08:28:16AM -0700, Paul E. McKenney wrote: > >> On Sat, Mar 26, 2016 at 12:29:31PM +, Mathieu Desnoyers wro

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

- On Mar 26, 2016, at 2:49 PM, Paul E. McKenney paul...@linux.vnet.ibm.com wrote: > On Sat, Mar 26, 2016 at 08:28:16AM -0700, Paul E. McKenney wrote: >> On Sat, Mar 26, 2016 at 12:29:31PM +, Mathieu Desnoyers wrote: >> > - On Mar 25, 2016, at 5:46 PM, Paul E. McKenney >> > paul...@li

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sat, Mar 26, 2016 at 08:28:16AM -0700, Paul E. McKenney wrote: > On Sat, Mar 26, 2016 at 12:29:31PM +, Mathieu Desnoyers wrote: > > - On Mar 25, 2016, at 5:46 PM, Paul E. McKenney > > paul...@linux.vnet.ibm.com wrote: > > > > > On Fri, Mar 25, 2016 at 09:24:14PM +, Chatre, Reinette

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sat, Mar 26, 2016 at 12:29:31PM +, Mathieu Desnoyers wrote: > - On Mar 25, 2016, at 5:46 PM, Paul E. McKenney > paul...@linux.vnet.ibm.com wrote: > > > On Fri, Mar 25, 2016 at 09:24:14PM +, Chatre, Reinette wrote: > >> Hi Paul, > >> > >> On 2016-03-23, Paul E. McKenney wrote: > >

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

- On Mar 25, 2016, at 5:46 PM, Paul E. McKenney paul...@linux.vnet.ibm.com wrote: > On Fri, Mar 25, 2016 at 09:24:14PM +, Chatre, Reinette wrote: >> Hi Paul, >> >> On 2016-03-23, Paul E. McKenney wrote: >> > Please boot with the following parameters: >> > >> >rcu_tree.rcu_kick_kthr

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Fri, Mar 25, 2016 at 09:24:14PM +, Chatre, Reinette wrote: > Hi Paul, > > On 2016-03-23, Paul E. McKenney wrote: > > Please boot with the following parameters: > > > > rcu_tree.rcu_kick_kthreads ftrace > > trace_event=sched_waking,sched_wakeup,sched_wake_idle_without_ipi > > With the

RE: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

Hi Paul, On 2016-03-23, Paul E. McKenney wrote: > Please boot with the following parameters: > > rcu_tree.rcu_kick_kthreads ftrace > trace_event=sched_waking,sched_wakeup,sched_wake_idle_without_ipi With these parameters I expected more details to show up in the kernel logs but cannot fi

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Wed, Mar 23, 2016 at 06:25:50PM +, Chatre, Reinette wrote: > Hi Paul, > > On 2016-03-23, Paul E. McKenney wrote: > > Please boot with the following parameters: > > > > rcu_tree.rcu_kick_kthreads ftrace > > trace_event=sched_waking,sched_wakeup,sched_wake_idle_without_ipi > > > > Or wa

RE: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

Hi Paul, On 2016-03-23, Paul E. McKenney wrote: > Please boot with the following parameters: > > rcu_tree.rcu_kick_kthreads ftrace > trace_event=sched_waking,sched_wakeup,sched_wake_idle_without_ipi > > Or was this run with tracing? If so, less than three hours isn't too bad. This was wi

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Wed, Mar 23, 2016 at 05:15:11PM +, Chatre, Reinette wrote: > Hi Paul, > > On 2016-03-22, Paul E. McKenney wrote: > > On Tue, Mar 22, 2016 at 09:04:47PM +, Chatre, Reinette wrote: > >> On 2016-03-22, Paul E. McKenney wrote: > >>> You set CONFIG_RCU_CPU_STALL_TIMEOUT=60, which matches the

RE: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

Hi Paul, On 2016-03-22, Paul E. McKenney wrote: > On Tue, Mar 22, 2016 at 09:04:47PM +, Chatre, Reinette wrote: >> On 2016-03-22, Paul E. McKenney wrote: >>> You set CONFIG_RCU_CPU_STALL_TIMEOUT=60, which matches the 60004 >>> jiffies above. Is that value due to a distro setting or something?

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Tue, Mar 22, 2016 at 09:04:47PM +, Chatre, Reinette wrote: > Hi Paul, > > On 2016-03-22, Paul E. McKenney wrote: > > On Tue, Mar 22, 2016 at 04:35:32PM +, Chatre, Reinette wrote: > >> On 2016-03-21, Paul E. McKenney wrote: > >>> On Mon, Mar 21, 2016 at 09:22:30AM -0700, Jacob Pan wrote:

RE: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

Hi Paul, On 2016-03-22, Paul E. McKenney wrote: > On Tue, Mar 22, 2016 at 04:35:32PM +, Chatre, Reinette wrote: >> On 2016-03-21, Paul E. McKenney wrote: >>> On Mon, Mar 21, 2016 at 09:22:30AM -0700, Jacob Pan wrote: On Fri, 18 Mar 2016 16:56:41 -0700 "Paul E. McKenney" wrote: >

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Tue, Mar 22, 2016 at 04:35:32PM +, Chatre, Reinette wrote: > Hi Paul, Hello, Reinette! > On 2016-03-21, Paul E. McKenney wrote: > > On Mon, Mar 21, 2016 at 09:22:30AM -0700, Jacob Pan wrote: > >> On Fri, 18 Mar 2016 16:56:41 -0700 > >> "Paul E. McKenney" wrote: > >>> On Fri, Mar 18, 2016

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Mon, Mar 21, 2016 at 09:22:30AM -0700, Jacob Pan wrote: > On Fri, 18 Mar 2016 16:56:41 -0700 > "Paul E. McKenney" wrote: > > On Fri, Mar 18, 2016 at 02:00:11PM -0700, Josh Triplett wrote: > > > On Thu, Feb 25, 2016 at 04:56:38PM -0800, Paul E. McKenney wrote: [ . . . ] > > > We're seeing a si

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Fri, 18 Mar 2016 16:56:41 -0700 "Paul E. McKenney" wrote: > On Fri, Mar 18, 2016 at 02:00:11PM -0700, Josh Triplett wrote: > > On Thu, Feb 25, 2016 at 04:56:38PM -0800, Paul E. McKenney wrote: > > > On Thu, Feb 25, 2016 at 04:13:11PM +1100, Ross Green wrote: > > > > On Wed, Feb 24, 2016 at 8:2

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Thu, Feb 25, 2016 at 04:56:38PM -0800, Paul E. McKenney wrote: > On Thu, Feb 25, 2016 at 04:13:11PM +1100, Ross Green wrote: > > On Wed, Feb 24, 2016 at 8:28 AM, Ross Green wrote: > > > On Wed, Feb 24, 2016 at 7:55 AM, Paul E. McKenney > > > wrote: > > [ . . . ] > > > >> Still working on get

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Fri, Mar 18, 2016 at 02:00:11PM -0700, Josh Triplett wrote: > On Thu, Feb 25, 2016 at 04:56:38PM -0800, Paul E. McKenney wrote: > > On Thu, Feb 25, 2016 at 04:13:11PM +1100, Ross Green wrote: > > > On Wed, Feb 24, 2016 at 8:28 AM, Ross Green wrote: > > > > On Wed, Feb 24, 2016 at 7:55 AM, Paul

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Fri, Mar 04, 2016 at 04:30:12PM +1100, Ross Green wrote: > On Fri, Feb 26, 2016 at 12:35 PM, Paul E. McKenney > wrote: [ . . . ] > >> OK, so what wakeup path omits the sched_wakeup event? > >> > >> The sched_waking event looks to occur once in try_to_wake_up() and > >> once in try_to_wake_up

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Fri, Feb 26, 2016 at 12:35 PM, Paul E. McKenney wrote: > This time actually attaching Daniel's patches... > > Thanx, Paul > > On Thu, Feb 25, 2016 at 04:56:38PM -0800, Paul E. McKenney wrote: >> On Thu, Feb 25, 2016 at 04:13:11PM +

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

This time actually attaching Daniel's patches... Thanx, Paul On Thu, Feb 25, 2016 at 04:56:38PM -0800, Paul E. McKenney wrote: > On Thu, Feb 25, 2016 at 04:13:11PM +1100, Ross Green wrote: > > On Wed, Feb 24, 2016 at 8:28 AM, Ross Gr

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Thu, Feb 25, 2016 at 04:13:11PM +1100, Ross Green wrote: > On Wed, Feb 24, 2016 at 8:28 AM, Ross Green wrote: > > On Wed, Feb 24, 2016 at 7:55 AM, Paul E. McKenney > > wrote: [ . . . ] > >> Still working on getting decent traces... And I might have succeeded, see below. > >> > >>

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Wed, Feb 24, 2016 at 8:28 AM, Ross Green wrote: > On Wed, Feb 24, 2016 at 7:55 AM, Paul E. McKenney > wrote: >> On Tue, Feb 23, 2016 at 08:34:11PM +, Mathieu Desnoyers wrote: >>> - On Feb 21, 2016, at 1:15 PM, Ross Green rgker...@gmail.com wrote: >>> >>> > On Sun, Feb 21, 2016 at 4:04

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Wed, Feb 24, 2016 at 7:55 AM, Paul E. McKenney wrote: > On Tue, Feb 23, 2016 at 08:34:11PM +, Mathieu Desnoyers wrote: >> - On Feb 21, 2016, at 1:15 PM, Ross Green rgker...@gmail.com wrote: >> >> > On Sun, Feb 21, 2016 at 4:04 PM, Ross Green wrote: >> >> On Sat, Feb 20, 2016 at 5:32 PM

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Tue, Feb 23, 2016 at 08:34:11PM +, Mathieu Desnoyers wrote: > - On Feb 21, 2016, at 1:15 PM, Ross Green rgker...@gmail.com wrote: > > > On Sun, Feb 21, 2016 at 4:04 PM, Ross Green wrote: > >> On Sat, Feb 20, 2016 at 5:32 PM, Paul E. McKenney > >> wrote: > >>> On Sat, Feb 20, 2016 at 0

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

- On Feb 21, 2016, at 1:15 PM, Ross Green rgker...@gmail.com wrote: > On Sun, Feb 21, 2016 at 4:04 PM, Ross Green wrote: >> On Sat, Feb 20, 2016 at 5:32 PM, Paul E. McKenney >> wrote: >>> On Sat, Feb 20, 2016 at 03:34:30PM +1100, Ross Green wrote: On Sat, Feb 20, 2016 at 4:33 AM, Paul E

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sat, Feb 20, 2016 at 5:32 PM, Paul E. McKenney wrote: > On Sat, Feb 20, 2016 at 03:34:30PM +1100, Ross Green wrote: >> On Sat, Feb 20, 2016 at 4:33 AM, Paul E. McKenney >> wrote: >> > On Thu, Feb 18, 2016 at 08:13:18PM -0800, John Stultz wrote: >> >> On Thu, Feb 18, 2016 at 7:56 PM, Ross Green

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sun, Feb 21, 2016 at 4:04 PM, Ross Green wrote: > On Sat, Feb 20, 2016 at 5:32 PM, Paul E. McKenney > wrote: >> On Sat, Feb 20, 2016 at 03:34:30PM +1100, Ross Green wrote: >>> On Sat, Feb 20, 2016 at 4:33 AM, Paul E. McKenney >>> wrote: >>> > On Thu, Feb 18, 2016 at 08:13:18PM -0800, John Stu

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sat, Feb 20, 2016 at 03:34:30PM +1100, Ross Green wrote: > On Sat, Feb 20, 2016 at 4:33 AM, Paul E. McKenney > wrote: > > On Thu, Feb 18, 2016 at 08:13:18PM -0800, John Stultz wrote: > >> On Thu, Feb 18, 2016 at 7:56 PM, Ross Green wrote: > >> > Well a bonus extra! > >> > Kept everything runni

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Sat, Feb 20, 2016 at 4:33 AM, Paul E. McKenney wrote: > On Thu, Feb 18, 2016 at 08:13:18PM -0800, John Stultz wrote: >> On Thu, Feb 18, 2016 at 7:56 PM, Ross Green wrote: >> > Well a bonus extra! >> > Kept everything running and there was another stall. >> > So i have included the demsg output

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Thu, Feb 18, 2016 at 08:13:18PM -0800, John Stultz wrote: > On Thu, Feb 18, 2016 at 7:56 PM, Ross Green wrote: > > Well a bonus extra! > > Kept everything running and there was another stall. > > So i have included the demsg output for perusal. > > > > Just to clear things up there is no hotplu

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Fri, Feb 19, 2016 at 3:22 PM, Paul E. McKenney wrote: > On Thu, Feb 18, 2016 at 11:14:21PM +, Mathieu Desnoyers wrote: >> - On Feb 18, 2016, at 6:51 AM, Ross Green rgker...@gmail.com wrote: >> >> > On Thu, Feb 18, 2016 at 10:19 AM, Paul E. McKenney >> > wrote: >> >> On Wed, Feb 17, 201

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Thu, Feb 18, 2016 at 11:14:21PM +, Mathieu Desnoyers wrote: > - On Feb 18, 2016, at 6:51 AM, Ross Green rgker...@gmail.com wrote: > > > On Thu, Feb 18, 2016 at 10:19 AM, Paul E. McKenney > > wrote: > >> On Wed, Feb 17, 2016 at 12:28:29PM -0800, Paul E. McKenney wrote: > >>> On Wed, Feb

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Thu, Feb 18, 2016 at 7:56 PM, Ross Green wrote: > Well a bonus extra! > Kept everything running and there was another stall. > So i have included the demsg output for perusal. > > Just to clear things up there is no hotplug involved in this system. > It is a standard Pandaboard ES Ti4460 two pr

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Fri, Feb 19, 2016 at 10:14 AM, Mathieu Desnoyers wrote: > - On Feb 18, 2016, at 6:51 AM, Ross Green rgker...@gmail.com wrote: > >> On Thu, Feb 18, 2016 at 10:19 AM, Paul E. McKenney >> wrote: >>> On Wed, Feb 17, 2016 at 12:28:29PM -0800, Paul E. McKenney wrote: On Wed, Feb 17, 2016 at

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

- On Feb 18, 2016, at 6:51 AM, Ross Green rgker...@gmail.com wrote: > On Thu, Feb 18, 2016 at 10:19 AM, Paul E. McKenney > wrote: >> On Wed, Feb 17, 2016 at 12:28:29PM -0800, Paul E. McKenney wrote: >>> On Wed, Feb 17, 2016 at 08:45:54PM +0100, Peter Zijlstra wrote: >>> > On Wed, Feb 17, 2016

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Thu, Feb 18, 2016 at 10:19 AM, Paul E. McKenney wrote: > On Wed, Feb 17, 2016 at 12:28:29PM -0800, Paul E. McKenney wrote: >> On Wed, Feb 17, 2016 at 08:45:54PM +0100, Peter Zijlstra wrote: >> > On Wed, Feb 17, 2016 at 11:28:17AM -0800, Paul E. McKenney wrote: >> > > On Tue, Feb 16, 2016 at 09:

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Wed, Feb 17, 2016 at 12:28:29PM -0800, Paul E. McKenney wrote: > On Wed, Feb 17, 2016 at 08:45:54PM +0100, Peter Zijlstra wrote: > > On Wed, Feb 17, 2016 at 11:28:17AM -0800, Paul E. McKenney wrote: > > > On Tue, Feb 16, 2016 at 09:45:49PM -0800, Paul E. McKenney wrote: > > > > On Tue, Feb 09, 2

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Wed, Feb 17, 2016 at 08:45:54PM +0100, Peter Zijlstra wrote: > On Wed, Feb 17, 2016 at 11:28:17AM -0800, Paul E. McKenney wrote: > > On Tue, Feb 16, 2016 at 09:45:49PM -0800, Paul E. McKenney wrote: > > > On Tue, Feb 09, 2016 at 09:11:55PM +1100, Ross Green wrote: > > > > Continued testing with

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Wed, Feb 17, 2016 at 11:28:17AM -0800, Paul E. McKenney wrote: > On Tue, Feb 16, 2016 at 09:45:49PM -0800, Paul E. McKenney wrote: > > On Tue, Feb 09, 2016 at 09:11:55PM +1100, Ross Green wrote: > > > Continued testing with the latest linux-4.5-rc3 release. > > > > > > Please find attached a co

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Tue, Feb 16, 2016 at 09:45:49PM -0800, Paul E. McKenney wrote: > On Tue, Feb 09, 2016 at 09:11:55PM +1100, Ross Green wrote: > > Continued testing with the latest linux-4.5-rc3 release. > > > > Please find attached a copy of traces from dmesg: > > > > There is a lot more debug and trace data s

Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17

On Tue, Feb 09, 2016 at 09:11:55PM +1100, Ross Green wrote: > Continued testing with the latest linux-4.5-rc3 release. > > Please find attached a copy of traces from dmesg: > > There is a lot more debug and trace data so hopefully this will shed > some light on what might be happening here. > >