On Tue, Jun 16, 2020 at 7:30 AM Joel Fernandes wrote:
>
> On Tue, Jun 16, 2020 at 10:40:04AM +0200, Thomas Gleixner wrote:
> > Joel,
> >
> > Joel Fernandes writes:
> > > On Fri, Jun 12, 2020 at 03:55:00PM +0200, Thomas Gleixner wrote:
> > >> This is also correct vs. user mode entries in NOHZ
On Tue, Jun 16, 2020 at 10:40:04AM +0200, Thomas Gleixner wrote:
> Joel,
>
> Joel Fernandes writes:
> > On Fri, Jun 12, 2020 at 03:55:00PM +0200, Thomas Gleixner wrote:
> >> This is also correct vs. user mode entries in NOHZ full scenarios because
> >> user mode entries bring RCU out of EQS and
Joel,
Joel Fernandes writes:
> On Fri, Jun 12, 2020 at 03:55:00PM +0200, Thomas Gleixner wrote:
>> This is also correct vs. user mode entries in NOHZ full scenarios because
>> user mode entries bring RCU out of EQS and force the RCU irq nesting state
>
> I had to re-read this sentence a couple
Hi Thomas, Paul,
On Fri, Jun 12, 2020 at 03:55:00PM +0200, Thomas Gleixner wrote:
> The idea of conditionally calling into rcu_irq_enter() only when RCU is
> not watching turned out to be not completely thought through.
>
> Paul noticed occasional premature end of grace periods in RCU torture
>
On Fri, Jun 12, 2020 at 09:34:56PM +0200, Thomas Gleixner wrote:
> Thomas Gleixner writes:
>
> > "Paul E. McKenney" writes:
> >> On Fri, Jun 12, 2020 at 10:49:53AM -0700, Paul E. McKenney wrote:
> >>> I will therefore address this issue in a follow-on patch.
> >>
> >> I should add that -your-
Thomas Gleixner writes:
> "Paul E. McKenney" writes:
>> On Fri, Jun 12, 2020 at 10:49:53AM -0700, Paul E. McKenney wrote:
>>> I will therefore address this issue in a follow-on patch.
>>
>> I should add that -your- patch from yesterday did -not- cause this
>> problem, in case that is of
> On Jun 12, 2020, at 12:25 PM, Thomas Gleixner wrote:
>
> "Paul E. McKenney" writes:
>>> On Fri, Jun 12, 2020 at 10:49:53AM -0700, Paul E. McKenney wrote:
>>> I will therefore address this issue in a follow-on patch.
>>
>> I should add that -your- patch from yesterday did -not- cause this
"Paul E. McKenney" writes:
> On Fri, Jun 12, 2020 at 10:49:53AM -0700, Paul E. McKenney wrote:
>> I will therefore address this issue in a follow-on patch.
>
> I should add that -your- patch from yesterday did -not- cause this
> problem, in case that is of interest.
So I still can add it back
On Fri, Jun 12, 2020 at 10:49:53AM -0700, Paul E. McKenney wrote:
> On Fri, Jun 12, 2020 at 03:55:00PM +0200, Thomas Gleixner wrote:
> > The idea of conditionally calling into rcu_irq_enter() only when RCU is
> > not watching turned out to be not completely thought through.
> >
> > Paul noticed
On Fri, Jun 12, 2020 at 03:55:00PM +0200, Thomas Gleixner wrote:
> The idea of conditionally calling into rcu_irq_enter() only when RCU is
> not watching turned out to be not completely thought through.
>
> Paul noticed occasional premature end of grace periods in RCU torture
> testing. Bisection
On Fri, Jun 12, 2020 at 6:55 AM Thomas Gleixner wrote:
>
> The idea of conditionally calling into rcu_irq_enter() only when RCU is
> not watching turned out to be not completely thought through.
>
> Paul noticed occasional premature end of grace periods in RCU torture
> testing. Bisection led to
Frederic Weisbecker writes:
> On Fri, Jun 12, 2020 at 03:55:00PM +0200, Thomas Gleixner wrote:
>> The idea of conditionally calling into rcu_irq_enter() only when RCU is
>> not watching turned out to be not completely thought through.
>>
>> Paul noticed occasional premature end of grace periods
On Fri, Jun 12, 2020 at 03:55:00PM +0200, Thomas Gleixner wrote:
> The idea of conditionally calling into rcu_irq_enter() only when RCU is
> not watching turned out to be not completely thought through.
>
> Paul noticed occasional premature end of grace periods in RCU torture
> testing. Bisection
The idea of conditionally calling into rcu_irq_enter() only when RCU is
not watching turned out to be not completely thought through.
Paul noticed occasional premature end of grace periods in RCU torture
testing. Bisection led to the commit which made the invocation of
rcu_irq_enter() conditional
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