On Fri, Oct 06, 2017 at 10:32:19AM +0200, Peter Zijlstra wrote:
> > AFAIU the scheduler rq->lock is held while preemption is disabled.
> > synchronize_sched() is used here to ensure that all pre-existing
> > preempt-off critical sections have completed.
> >
> > So saying that we use synchronize_sc
On Fri, Oct 6, 2017 at 12:02 AM, Andrea Parri wrote:
> On Thu, Oct 05, 2017 at 04:02:06PM +, Mathieu Desnoyers wrote:
>> - On Oct 5, 2017, at 8:12 AM, Peter Zijlstra pet...@infradead.org wrote:
>>
>> > On Wed, Oct 04, 2017 at 02:37:53PM -0700, Paul E. McKenney wrote:
>> >> diff --git a/arc
On Thu, Oct 05, 2017 at 04:02:06PM +, Mathieu Desnoyers wrote:
> - On Oct 5, 2017, at 8:12 AM, Peter Zijlstra pet...@infradead.org wrote:
>
> > On Wed, Oct 04, 2017 at 02:37:53PM -0700, Paul E. McKenney wrote:
> >> diff --git a/arch/powerpc/kernel/membarrier.c
> >> b/arch/powerpc/kernel/m
On 10/05/2017 07:23 AM, Nicholas Piggin wrote:
On Wed, 4 Oct 2017 14:37:53 -0700
"Paul E. McKenney" wrote:
From: Mathieu Desnoyers
Provide a new command allowing processes to register their intent to use
the private expedited command.
This allows PowerPC to skip the full memory barrier i
> AFAIU the scheduler rq->lock is held while preemption is disabled.
> synchronize_sched() is used here to ensure that all pre-existing
> preempt-off critical sections have completed.
>
> So saying that we use synchronize_sched() to synchronize with rq->lock
> would be stretching the truth a bit.
On Thu, 5 Oct 2017 22:19:15 + (UTC)
Mathieu Desnoyers wrote:
> AFAIU the scheduler rq->lock is held while preemption is disabled.
> synchronize_sched() is used here to ensure that all pre-existing
> preempt-off critical sections have completed.
>
> So saying that we use synchronize_sched() t
- On Oct 5, 2017, at 6:02 PM, Andrea Parri parri.and...@gmail.com wrote:
> On Thu, Oct 05, 2017 at 04:02:06PM +, Mathieu Desnoyers wrote:
>> - On Oct 5, 2017, at 8:12 AM, Peter Zijlstra pet...@infradead.org wrote:
>>
>> > On Wed, Oct 04, 2017 at 02:37:53PM -0700, Paul E. McKenney wrot
- On Oct 5, 2017, at 12:21 PM, Peter Zijlstra pet...@infradead.org wrote:
> On Thu, Oct 05, 2017 at 04:02:06PM +, Mathieu Desnoyers wrote:
>> - On Oct 5, 2017, at 8:12 AM, Peter Zijlstra pet...@infradead.org wrote:
>>
>> > On Wed, Oct 04, 2017 at 02:37:53PM -0700, Paul E. McKenney wro
On Thu, Oct 05, 2017 at 04:02:06PM +, Mathieu Desnoyers wrote:
> - On Oct 5, 2017, at 8:12 AM, Peter Zijlstra pet...@infradead.org wrote:
>
> > On Wed, Oct 04, 2017 at 02:37:53PM -0700, Paul E. McKenney wrote:
> >> diff --git a/arch/powerpc/kernel/membarrier.c
> >> b/arch/powerpc/kernel/m
- On Oct 5, 2017, at 8:24 AM, Peter Zijlstra pet...@infradead.org wrote:
> On Thu, Oct 05, 2017 at 02:12:50PM +0200, Peter Zijlstra wrote:
>> On Wed, Oct 04, 2017 at 02:37:53PM -0700, Paul E. McKenney wrote:
>> > diff --git a/arch/powerpc/kernel/membarrier.c
>> > b/arch/powerpc/kernel/membar
- On Oct 5, 2017, at 8:12 AM, Peter Zijlstra pet...@infradead.org wrote:
> On Wed, Oct 04, 2017 at 02:37:53PM -0700, Paul E. McKenney wrote:
>> diff --git a/arch/powerpc/kernel/membarrier.c
>> b/arch/powerpc/kernel/membarrier.c
>> new file mode 100644
>> index ..b0d79a5f5981
>> --
- On Oct 5, 2017, at 8:22 AM, Avi Kivity a...@scylladb.com wrote:
> On 10/05/2017 07:23 AM, Nicholas Piggin wrote:
>> On Wed, 4 Oct 2017 14:37:53 -0700
>> "Paul E. McKenney" wrote:
>>
>>> From: Mathieu Desnoyers
>>>
>>> Provide a new command allowing processes to register their intent to us
- On Oct 5, 2017, at 12:23 AM, Nicholas Piggin npig...@gmail.com wrote:
> On Wed, 4 Oct 2017 14:37:53 -0700
> "Paul E. McKenney" wrote:
>
>> From: Mathieu Desnoyers
>>
>> Provide a new command allowing processes to register their intent to use
>> the private expedited command.
>>
>> This
On Thu, Oct 05, 2017 at 02:12:50PM +0200, Peter Zijlstra wrote:
> On Wed, Oct 04, 2017 at 02:37:53PM -0700, Paul E. McKenney wrote:
> > diff --git a/arch/powerpc/kernel/membarrier.c
> > b/arch/powerpc/kernel/membarrier.c
> > new file mode 100644
> > index ..b0d79a5f5981
> > --- /dev/nu
On Wed, Oct 04, 2017 at 02:37:53PM -0700, Paul E. McKenney wrote:
> diff --git a/arch/powerpc/kernel/membarrier.c
> b/arch/powerpc/kernel/membarrier.c
> new file mode 100644
> index ..b0d79a5f5981
> --- /dev/null
> +++ b/arch/powerpc/kernel/membarrier.c
> @@ -0,0 +1,45 @@
> +void memb
On Wed, 4 Oct 2017 14:37:53 -0700
"Paul E. McKenney" wrote:
> From: Mathieu Desnoyers
>
> Provide a new command allowing processes to register their intent to use
> the private expedited command.
>
> This allows PowerPC to skip the full memory barrier in switch_mm(), and
> only issue the barr
From: Mathieu Desnoyers
Provide a new command allowing processes to register their intent to use
the private expedited command.
This allows PowerPC to skip the full memory barrier in switch_mm(), and
only issue the barrier when scheduling into a task belonging to a
process that has registered to
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