Hi Vineeth,
On Mon, Jul 06, 2020 at 10:38:27AM -0400, Vineeth Remanan Pillai wrote:
> On Mon, Jul 6, 2020 at 10:09 AM Joel Fernandes wrote:
> >
> > > I am not sure if this can happen. If the other sibling sets core_pick, it
> > > will be under the core wide lock and it should set the core_sched_s
On Mon, Jul 6, 2020 at 10:09 AM Joel Fernandes wrote:
>
> > I am not sure if this can happen. If the other sibling sets core_pick, it
> > will be under the core wide lock and it should set the core_sched_seq also
> > before releasing the lock. So when this cpu tries, it would see the
> > core_pic
On Fri, Jul 03, 2020 at 04:21:46PM -0400, Vineeth Remanan Pillai wrote:
> On Wed, Jul 1, 2020 at 7:28 PM Joel Fernandes wrote:
> >
> > From: "Joel Fernandes (Google)"
> > Subject: [PATCH] sched: Fix CPU hotplug causing crashes in task selection
> > logic
> >
> > The selection logic does not run
On 7/2/20 5:57 AM, Joel Fernandes wrote:
> On Wed, Jul 01, 2020 at 05:54:11PM -0700, Tim Chen wrote:
>>
>>
>> On 7/1/20 4:28 PM, Joel Fernandes wrote:
>>> On Tue, Jun 30, 2020 at 09:32:27PM +, Vineeth Remanan Pillai wrote:
From: Peter Zijlstra
Instead of only selecting a loca
On Wed, Jul 1, 2020 at 7:28 PM Joel Fernandes wrote:
>
> From: "Joel Fernandes (Google)"
> Subject: [PATCH] sched: Fix CPU hotplug causing crashes in task selection
> logic
>
> The selection logic does not run correctly if the current CPU is not in the
> cpu_smt_mask (which it is not because the
On Thu, Jul 02, 2020 at 08:57:57AM -0400, Joel Fernandes wrote:
[...]
> > > unconstrained pick, then rq->core_pick is set. The next time task
> > > selection
> > > logic runs when stopper needs to switch to idle, the current CPU is not in
> > > the smt_mask. This causes the previous ->core_pick t
On Wed, Jul 01, 2020 at 05:54:11PM -0700, Tim Chen wrote:
>
>
> On 7/1/20 4:28 PM, Joel Fernandes wrote:
> > On Tue, Jun 30, 2020 at 09:32:27PM +, Vineeth Remanan Pillai wrote:
> >> From: Peter Zijlstra
> >>
> >> Instead of only selecting a local task, select a task for all SMT
> >> siblings
On 7/1/20 4:28 PM, Joel Fernandes wrote:
> On Tue, Jun 30, 2020 at 09:32:27PM +, Vineeth Remanan Pillai wrote:
>> From: Peter Zijlstra
>>
>> Instead of only selecting a local task, select a task for all SMT
>> siblings for every reschedule on the core (irrespective which logical
>> CPU does
On Tue, Jun 30, 2020 at 09:32:27PM +, Vineeth Remanan Pillai wrote:
> From: Peter Zijlstra
>
> Instead of only selecting a local task, select a task for all SMT
> siblings for every reschedule on the core (irrespective which logical
> CPU does the reschedule).
>
> There could be races in cor
From: Peter Zijlstra
Instead of only selecting a local task, select a task for all SMT
siblings for every reschedule on the core (irrespective which logical
CPU does the reschedule).
There could be races in core scheduler where a CPU is trying to pick
a task for its sibling in core scheduler, wh
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