On Fri, Aug 28, 2015 at 10:32:59AM +0200, Ingo Molnar wrote:
>
> * Frederic Weisbecker wrote:
>
> > On Tue, Aug 25, 2015 at 10:29:04AM +0200, Ingo Molnar wrote:
> > >
> > > * Frederic Weisbecker wrote:
> > >
> > > > On Mon, Aug 24, 2015 at 08:44:12AM +0200, Ingo Molnar wrote:
> > > > > 2)
> >
* Frederic Weisbecker wrote:
> On Tue, Aug 25, 2015 at 10:29:04AM +0200, Ingo Molnar wrote:
> >
> > * Frederic Weisbecker wrote:
> >
> > > On Mon, Aug 24, 2015 at 08:44:12AM +0200, Ingo Molnar wrote:
> > > > 2)
> > > >
> > > > What happens if the boot CPU is offlined? (under
> > > > CONFIG_
On Tue, Aug 25, 2015 at 10:29:04AM +0200, Ingo Molnar wrote:
>
> * Frederic Weisbecker wrote:
>
> > On Mon, Aug 24, 2015 at 08:44:12AM +0200, Ingo Molnar wrote:
> > > 2)
> > >
> > > What happens if the boot CPU is offlined? (under
> > > CONFIG_BOOTPARAM_HOTPLUG_CPU0=y)
> > >
> > > I don't see
* Frederic Weisbecker wrote:
> On Mon, Aug 24, 2015 at 08:44:12AM +0200, Ingo Molnar wrote:
> > 2)
> >
> > What happens if the boot CPU is offlined? (under
> > CONFIG_BOOTPARAM_HOTPLUG_CPU0=y)
> >
> > I don't see CPU hotplug callbacks fixing up the housekeeping_mask if the
> > boot CPU
> >
On Mon, Aug 24, 2015 at 04:04:37PM +0200, Frederic Weisbecker wrote:
> On Mon, Aug 24, 2015 at 06:50:18AM -0700, Paul E. McKenney wrote:
> > On Mon, Aug 24, 2015 at 08:44:12AM +0200, Ingo Molnar wrote:
> > >
> > > * Paul E. McKenney wrote:
> > >
> > > > > here it's fully set - triggering the bug
On Mon, Aug 24, 2015 at 06:50:18AM -0700, Paul E. McKenney wrote:
> On Mon, Aug 24, 2015 at 08:44:12AM +0200, Ingo Molnar wrote:
> >
> > * Paul E. McKenney wrote:
> >
> > > > here it's fully set - triggering the bug I'm worried about. So what am
> > > > I
> > > > missing, what prevents CONFIG_
On Mon, 2015-08-24 at 15:36 +0200, Frederic Weisbecker wrote:
> On Mon, Aug 24, 2015 at 08:44:12AM +0200, Ingo Molnar wrote:
> > 2)
> >
> > What happens if the boot CPU is offlined? (under
> > CONFIG_BOOTPARAM_HOTPLUG_CPU0=y)
> >
> > I don't see CPU hotplug callbacks fixing up the housekeeping_m
On Mon, Aug 24, 2015 at 08:44:12AM +0200, Ingo Molnar wrote:
>
> * Paul E. McKenney wrote:
>
> > > here it's fully set - triggering the bug I'm worried about. So what am I
> > > missing, what prevents CONFIG_NO_HZ_FULL_ALL from crashing?
> >
> > The boot CPU is excluded from tick_nohz_full_mas
On Mon, Aug 24, 2015 at 08:44:12AM +0200, Ingo Molnar wrote:
> 2)
>
> What happens if the boot CPU is offlined? (under
> CONFIG_BOOTPARAM_HOTPLUG_CPU0=y)
>
> I don't see CPU hotplug callbacks fixing up the housekeeping_mask if the boot
> CPU
> is offlined.
We have tick_nohz_cpu_down_callback(
* Mike Galbraith wrote:
> On Mon, 2015-08-24 at 09:41 +0200, Ingo Molnar wrote:
> > * Mike Galbraith wrote:
> >
> > > On Mon, 2015-08-24 at 08:44 +0200, Ingo Molnar wrote:
> > >
> > > > the 'housekeeping CPU' is essentially the boot CPU. Yet we dedicate a
> > > > full mask to
> > > > it (ho
On Mon, 2015-08-24 at 09:41 +0200, Ingo Molnar wrote:
> * Mike Galbraith wrote:
>
> > On Mon, 2015-08-24 at 08:44 +0200, Ingo Molnar wrote:
> >
> > > the 'housekeeping CPU' is essentially the boot CPU. Yet we dedicate a
> > > full mask to
> > > it (housekeeping_mask - a variable mask to begin
* Mike Galbraith wrote:
> On Mon, 2015-08-24 at 08:44 +0200, Ingo Molnar wrote:
>
> > the 'housekeeping CPU' is essentially the boot CPU. Yet we dedicate a full
> > mask to
> > it (housekeeping_mask - a variable mask to begin with) and recover the
> > housekeeping CPU via:
> >
> > + r
On Mon, 2015-08-24 at 08:44 +0200, Ingo Molnar wrote:
> the 'housekeeping CPU' is essentially the boot CPU. Yet we dedicate a full
> mask to
> it (housekeeping_mask - a variable mask to begin with) and recover the
> housekeeping CPU via:
>
> + return cpumask_any_and(housekeeping_mask, cp
* Paul E. McKenney wrote:
> > here it's fully set - triggering the bug I'm worried about. So what am I
> > missing, what prevents CONFIG_NO_HZ_FULL_ALL from crashing?
>
> The boot CPU is excluded from tick_nohz_full_mask in tick_nohz_init(), which
> is
> called from tick_init() which is call
On Sun, Aug 23, 2015 at 07:40:32AM +0200, Ingo Molnar wrote:
> So I almost applied this yesterday, but had the following question: what
> ensures
> that housekeeping_mask isn't empty? If it's empty then housekeeping_any_cpu()
> returns cpumask_any_and() of an empty cpumask - which returns an out
On Sun, Aug 23, 2015 at 09:01:01AM -0700, Paul E. McKenney wrote:
> The boot CPU is excluded from tick_nohz_full_mask in tick_nohz_init(),
> which is called from tick_init() which is called from start_kernel()
> shortly after rcu_init():
>
> cpu = smp_processor_id();
>
> if (cpumask_t
On Sun, Aug 23, 2015 at 07:40:32AM +0200, Ingo Molnar wrote:
>
> * Frederic Weisbecker wrote:
>
> > From: Vatika Harlalka
> >
> > The problem addressed in this patch is about affining unpinned timers.
> > Adaptive or Full Dynticks CPUs are currently disturbed by unnecessary
> > jitter due to f
* Frederic Weisbecker wrote:
> From: Vatika Harlalka
>
> The problem addressed in this patch is about affining unpinned timers.
> Adaptive or Full Dynticks CPUs are currently disturbed by unnecessary
> jitter due to firing of such timers on them.
>
> This patch will affine timers to online CP
On Sat, 22 Aug 2015, Frederic Weisbecker wrote:
> Ping!
Exellent!!!
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Ping!
On Fri, Aug 14, 2015 at 03:46:14AM +0200, Frederic Weisbecker wrote:
> From: Vatika Harlalka
>
> The problem addressed in this patch is about affining unpinned timers.
> Adaptive or Full Dynticks CPUs are currently disturbed by unnecessary
> jitter due to firing of such timers on them.
>
From: Vatika Harlalka
The problem addressed in this patch is about affining unpinned timers.
Adaptive or Full Dynticks CPUs are currently disturbed by unnecessary
jitter due to firing of such timers on them.
This patch will affine timers to online CPUs which are not full dynticks
in NOHZ_FULL co
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