On Mon, May 25, 2020 at 04:05:49PM +0200, Frederic Weisbecker wrote:
> On Mon, May 25, 2020 at 03:21:05PM +0200, Peter Zijlstra wrote:
> > @@ -2320,7 +2304,7 @@ static void ttwu_queue_remote(struct task_struct *p,
> > int cpu, int wake_flags)
> >
> > if (llist_add(&p->wake_entry, &rq->wake_l
On Mon, May 25, 2020 at 03:21:05PM +0200, Peter Zijlstra wrote:
> - flags = atomic_fetch_andnot(NOHZ_KICK_MASK, nohz_flags(this_cpu));
> - if (!(flags & NOHZ_KICK_MASK))
> + if (idle != CPU_IDLE)
> return false;
>
> _nohz_idle_balance(this_rq, flags, idle);
Bah, I
On Mon, May 25, 2020 at 03:21:05PM +0200, Peter Zijlstra wrote:
> @@ -2320,7 +2304,7 @@ static void ttwu_queue_remote(struct task_struct *p,
> int cpu, int wake_flags)
>
> if (llist_add(&p->wake_entry, &rq->wake_list)) {
> if (!set_nr_if_polling(rq->idle))
> -
On Thu, May 21, 2020 at 02:41:14PM +0200, Frederic Weisbecker wrote:
> On Thu, May 21, 2020 at 01:00:27PM +0200, Peter Zijlstra wrote:
> > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> > index 01f94cf52783..b6d8a7b991f0 100644
> > --- a/kernel/sched/fair.c
> > +++ b/kernel/sched/fair.c
On Thu, May 21, 2020 at 11:39:38AM +0200, Peter Zijlstra wrote:
> On Thu, May 21, 2020 at 02:40:36AM +0200, Frederic Weisbecker wrote:
> > On Wed, May 20, 2020 at 02:50:56PM +0200, Peter Zijlstra wrote:
> > > On Tue, May 19, 2020 at 11:58:17PM -0400, Qian Cai wrote:
> > > > Just a head up. Repeated
On Thu, May 21, 2020 at 01:00:27PM +0200, Peter Zijlstra wrote:
> On Thu, May 21, 2020 at 12:49:37PM +0200, Peter Zijlstra wrote:
> > On Thu, May 21, 2020 at 11:39:39AM +0200, Peter Zijlstra wrote:
> > > On Thu, May 21, 2020 at 02:40:36AM +0200, Frederic Weisbecker wrote:
> >
> > > This:
> > >
>
On Thu, May 21, 2020 at 12:49:37PM +0200, Peter Zijlstra wrote:
> On Thu, May 21, 2020 at 11:39:39AM +0200, Peter Zijlstra wrote:
> > On Thu, May 21, 2020 at 02:40:36AM +0200, Frederic Weisbecker wrote:
>
> > This:
> >
> > > smp_call_function_single_async() {
> > > smp_call_f
On Thu, May 21, 2020 at 11:39:39AM +0200, Peter Zijlstra wrote:
> On Thu, May 21, 2020 at 02:40:36AM +0200, Frederic Weisbecker wrote:
> This:
>
> > smp_call_function_single_async() {
> > smp_call_function_single_async() {
> > // verified csd->flags != CSD_LOCK
On Thu, May 21, 2020 at 02:40:36AM +0200, Frederic Weisbecker wrote:
>atomic_fetch_or(,
> nohz_flags(0))
> softirq() {#VMEXIT or anything
> that could stop a CPU for a while
> run_reba
On Thu, May 21, 2020 at 02:40:36AM +0200, Frederic Weisbecker wrote:
> On Wed, May 20, 2020 at 02:50:56PM +0200, Peter Zijlstra wrote:
> > On Tue, May 19, 2020 at 11:58:17PM -0400, Qian Cai wrote:
> > > Just a head up. Repeatedly compiling kernels for a while would trigger
> > > endless soft-lockup
On Wed, May 20, 2020 at 02:50:56PM +0200, Peter Zijlstra wrote:
> On Tue, May 19, 2020 at 11:58:17PM -0400, Qian Cai wrote:
> > Just a head up. Repeatedly compiling kernels for a while would trigger
> > endless soft-lockups since next-20200519 on both x86_64 and powerpc.
> > .config are in,
>
> Co
On Wed, May 20, 2020 at 02:50:56PM +0200, Peter Zijlstra wrote:
> On Tue, May 19, 2020 at 11:58:17PM -0400, Qian Cai wrote:
> > Just a head up. Repeatedly compiling kernels for a while would trigger
> > endless soft-lockups since next-20200519 on both x86_64 and powerpc.
> > .config are in,
>
> Co
On Tue, May 19, 2020 at 11:58:17PM -0400, Qian Cai wrote:
> Just a head up. Repeatedly compiling kernels for a while would trigger
> endless soft-lockups since next-20200519 on both x86_64 and powerpc.
> .config are in,
Could be 90b5363acd47 ("sched: Clean up scheduler_ipi()"), although I've
not s
Just a head up. Repeatedly compiling kernels for a while would trigger
endless soft-lockups since next-20200519 on both x86_64 and powerpc.
.config are in,
https://github.com/cailca/linux-mm
I did first try to revert the linux-next commit 68cd9f4e7238
("tick/nohz: Narrow down noise while setting
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