Re: [PATCH 1/2] srcu: Fix broken node geometry after early ssp init

2021-04-19 Thread Paul E. McKenney
On Mon, Apr 19, 2021 at 02:23:45AM +0200, Frederic Weisbecker wrote: > On Sat, Apr 17, 2021 at 09:46:16PM -0700, Paul E. McKenney wrote: > > On Sat, Apr 17, 2021 at 03:16:49PM +0200, Frederic Weisbecker wrote: > > > On Wed, Apr 14, 2021 at 08:55:38AM -0700, Paul E. McKenney wrote: > > > > > diff

Re: [PATCH 1/2] srcu: Fix broken node geometry after early ssp init

2021-04-18 Thread Frederic Weisbecker
On Sat, Apr 17, 2021 at 09:46:16PM -0700, Paul E. McKenney wrote: > On Sat, Apr 17, 2021 at 03:16:49PM +0200, Frederic Weisbecker wrote: > > On Wed, Apr 14, 2021 at 08:55:38AM -0700, Paul E. McKenney wrote: > > > > diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h > > > > index

Re: [PATCH 1/2] srcu: Fix broken node geometry after early ssp init

2021-04-17 Thread Paul E. McKenney
On Sat, Apr 17, 2021 at 03:16:49PM +0200, Frederic Weisbecker wrote: > On Wed, Apr 14, 2021 at 08:55:38AM -0700, Paul E. McKenney wrote: > > > diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h > > > index 75ed367d5b60..24db97cbf76b 100644 > > > --- a/kernel/rcu/rcu.h > > > +++ b/kernel/rcu/rcu.h >

Re: [PATCH 1/2] srcu: Fix broken node geometry after early ssp init

2021-04-17 Thread Frederic Weisbecker
On Wed, Apr 14, 2021 at 08:55:38AM -0700, Paul E. McKenney wrote: > > diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h > > index 75ed367d5b60..24db97cbf76b 100644 > > --- a/kernel/rcu/rcu.h > > +++ b/kernel/rcu/rcu.h > > @@ -278,6 +278,7 @@ extern void resched_cpu(int cpu); > > extern int

Re: [PATCH 1/2] srcu: Fix broken node geometry after early ssp init

2021-04-16 Thread Frederic Weisbecker
On Wed, Apr 14, 2021 at 08:55:38AM -0700, Paul E. McKenney wrote: > On Wed, Apr 14, 2021 at 03:24:12PM +0200, Frederic Weisbecker wrote: > > diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h > > index 75ed367d5b60..24db97cbf76b 100644 > > --- a/kernel/rcu/rcu.h > > +++ b/kernel/rcu/rcu.h > > @@

Re: [PATCH 1/2] srcu: Fix broken node geometry after early ssp init

2021-04-14 Thread Paul E. McKenney
On Wed, Apr 14, 2021 at 03:24:12PM +0200, Frederic Weisbecker wrote: > An ssp initialized before rcu_init_geometry() will have its snp hierarchy > based on CONFIG_NR_CPUS. > > Once rcu_init_geometry() is called, the nodes distribution is shrinked > and optimized toward meeting the actual possible

[PATCH 1/2] srcu: Fix broken node geometry after early ssp init

2021-04-14 Thread Frederic Weisbecker
An ssp initialized before rcu_init_geometry() will have its snp hierarchy based on CONFIG_NR_CPUS. Once rcu_init_geometry() is called, the nodes distribution is shrinked and optimized toward meeting the actual possible number of CPUs detected on boot. Later on, the ssp that was initialized