On Thu, 20 Sep 2012, Linus Walleij wrote:
> On Thu, Sep 20, 2012 at 2:03 AM, Paul E. McKenney
> wrote:
>
> > Any thoughts on the feasibility of implementing NMI-based stack backtraces
> > for ARM?
>
> Nico's department, so let's page him.
That _could_ be done, at least in theory, with some
On Thu, Sep 20, 2012 at 11:07:37AM +0200, Linus Walleij wrote:
> On Thu, Sep 20, 2012 at 2:03 AM, Paul E. McKenney
> wrote:
>
> > In the meantime, a crude fallback is for the CPU that detected the stall
> > to trace the stack of the task running on the other CPU. See below for
> > a crude (and
On Thu, Sep 20, 2012 at 2:03 AM, Paul E. McKenney
wrote:
> In the meantime, a crude fallback is for the CPU that detected the stall
> to trace the stack of the task running on the other CPU. See below for
> a crude (and untested) patch.
OK now I get this:
INFO: rcu_preempt detected stalls on
On Thu, Sep 20, 2012 at 2:03 AM, Paul E. McKenney
wrote:
> Any thoughts on the feasibility of implementing NMI-based stack backtraces
> for ARM?
Nico's department, so let's page him.
In IIRC ux500 all NMIs are reserved for the secure world, so it's
basically a no can do. :-(
And I'm told this
On Thu, Sep 20, 2012 at 2:03 AM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
Any thoughts on the feasibility of implementing NMI-based stack backtraces
for ARM?
Nico's department, so let's page him.
In IIRC ux500 all NMIs are reserved for the secure world, so it's
basically a no can
On Thu, Sep 20, 2012 at 2:03 AM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
In the meantime, a crude fallback is for the CPU that detected the stall
to trace the stack of the task running on the other CPU. See below for
a crude (and untested) patch.
OK now I get this:
INFO:
On Thu, Sep 20, 2012 at 11:07:37AM +0200, Linus Walleij wrote:
On Thu, Sep 20, 2012 at 2:03 AM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
In the meantime, a crude fallback is for the CPU that detected the stall
to trace the stack of the task running on the other CPU. See below
On Thu, 20 Sep 2012, Linus Walleij wrote:
On Thu, Sep 20, 2012 at 2:03 AM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
Any thoughts on the feasibility of implementing NMI-based stack backtraces
for ARM?
Nico's department, so let's page him.
That _could_ be done, at least in
On Mon, Sep 17, 2012 at 11:10:30AM +0200, Linus Walleij wrote:
> On Fri, Sep 14, 2012 at 7:53 PM, Paul E. McKenney
> wrote:
>
> > Could you please try reproducing with CONFIG_RCU_CPU_STALL_INFO=y?
>
> Yep: looks like this:
>
> INFO: rcu_preempt detected stalls on CPUs/tasks:
> 0: (0
On Mon, Sep 17, 2012 at 11:10:30AM +0200, Linus Walleij wrote:
On Fri, Sep 14, 2012 at 7:53 PM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
Could you please try reproducing with CONFIG_RCU_CPU_STALL_INFO=y?
Yep: looks like this:
INFO: rcu_preempt detected stalls on CPUs/tasks:
On Fri, Sep 14, 2012 at 7:53 PM, Paul E. McKenney
wrote:
> Could you please try reproducing with CONFIG_RCU_CPU_STALL_INFO=y?
Yep: looks like this:
INFO: rcu_preempt detected stalls on CPUs/tasks:
0: (0 ticks this GP) idle=458/0/0
(detected by 1, t=29904 jiffies)
[]
On Fri, Sep 14, 2012 at 7:53 PM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
Could you please try reproducing with CONFIG_RCU_CPU_STALL_INFO=y?
Yep: looks like this:
INFO: rcu_preempt detected stalls on CPUs/tasks:
0: (0 ticks this GP) idle=458/0/0
(detected by 1,
On Fri, Sep 14, 2012 at 09:27:32AM +0200, Linus Walleij wrote:
> On Thu, Sep 13, 2012 at 6:58 PM, Paul E. McKenney
> wrote:
> > On Thu, Sep 13, 2012 at 09:49:14AM -0700, John Stultz wrote:
> >> I saw this once as well testing the fix to Daniel's deep idle hang
> >> issue (also on 32 bit).
>
>
On Thu, Sep 13, 2012 at 6:58 PM, Paul E. McKenney
wrote:
> On Thu, Sep 13, 2012 at 09:49:14AM -0700, John Stultz wrote:
>> I saw this once as well testing the fix to Daniel's deep idle hang
>> issue (also on 32 bit).
John, what system was this? If it's not Snowball/ux500 we can atleast
conclude
On Thu, Sep 13, 2012 at 6:58 PM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
On Thu, Sep 13, 2012 at 09:49:14AM -0700, John Stultz wrote:
I saw this once as well testing the fix to Daniel's deep idle hang
issue (also on 32 bit).
John, what system was this? If it's not Snowball/ux500 we
On Fri, Sep 14, 2012 at 09:27:32AM +0200, Linus Walleij wrote:
On Thu, Sep 13, 2012 at 6:58 PM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
On Thu, Sep 13, 2012 at 09:49:14AM -0700, John Stultz wrote:
I saw this once as well testing the fix to Daniel's deep idle hang
issue (also on
On Thu, Sep 13, 2012 at 09:49:14AM -0700, John Stultz wrote:
> On 09/13/2012 05:36 AM, Linus Walleij wrote:
> >Hi Paul et al,
> >
> >I have this sporadic lockup in the SMP idle thread on ARM U8500:
> >
> >root@ME:/
> >root@ME:/
> >root@ME:/ INFO: rcu_preempt detected stalls on CPUs/tasks: { 0}
>
On 09/13/2012 05:36 AM, Linus Walleij wrote:
Hi Paul et al,
I have this sporadic lockup in the SMP idle thread on ARM U8500:
root@ME:/
root@ME:/
root@ME:/ INFO: rcu_preempt detected stalls on CPUs/tasks: { 0}
(detected by 1, t=23190 jiffies)
[] (unwind_backtrace+0x0/0xf8) from []
Hi Paul et al,
I have this sporadic lockup in the SMP idle thread on ARM U8500:
root@ME:/
root@ME:/
root@ME:/ INFO: rcu_preempt detected stalls on CPUs/tasks: { 0}
(detected by 1, t=23190 jiffies)
[] (unwind_backtrace+0x0/0xf8) from []
(rcu_check_callbacks+0x69c/0x6e0)
[]
Hi Paul et al,
I have this sporadic lockup in the SMP idle thread on ARM U8500:
root@ME:/
root@ME:/
root@ME:/ INFO: rcu_preempt detected stalls on CPUs/tasks: { 0}
(detected by 1, t=23190 jiffies)
[c0014710] (unwind_backtrace+0x0/0xf8) from [c0068624]
(rcu_check_callbacks+0x69c/0x6e0)
[c0068624]
On 09/13/2012 05:36 AM, Linus Walleij wrote:
Hi Paul et al,
I have this sporadic lockup in the SMP idle thread on ARM U8500:
root@ME:/
root@ME:/
root@ME:/ INFO: rcu_preempt detected stalls on CPUs/tasks: { 0}
(detected by 1, t=23190 jiffies)
[c0014710] (unwind_backtrace+0x0/0xf8) from
On Thu, Sep 13, 2012 at 09:49:14AM -0700, John Stultz wrote:
On 09/13/2012 05:36 AM, Linus Walleij wrote:
Hi Paul et al,
I have this sporadic lockup in the SMP idle thread on ARM U8500:
root@ME:/
root@ME:/
root@ME:/ INFO: rcu_preempt detected stalls on CPUs/tasks: { 0}
(detected by 1,
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