Re: NO_HZ_FULL and tick running within a reasonable amount of time

2018-04-23 Thread Paul E. McKenney
On Mon, Apr 23, 2018 at 03:04:23PM +0200, Frederic Weisbecker wrote: > On Tue, Apr 03, 2018 at 10:08:58AM -0700, Paul E. McKenney wrote: > > On Tue, Apr 03, 2018 at 01:41:31PM +0200, Frederic Weisbecker wrote: > > > On Mon, Apr 02, 2018 at 03:04:38PM -0700, Paul E. McKenney wrote: > > > > Hello! >

Re: NO_HZ_FULL and tick running within a reasonable amount of time

2018-04-23 Thread Frederic Weisbecker
On Tue, Apr 03, 2018 at 10:08:58AM -0700, Paul E. McKenney wrote: > On Tue, Apr 03, 2018 at 01:41:31PM +0200, Frederic Weisbecker wrote: > > On Mon, Apr 02, 2018 at 03:04:38PM -0700, Paul E. McKenney wrote: > > > Hello! > > > > > > I am hitting the following on today's mainline under rcutorture, b

Re: NO_HZ_FULL and tick running within a reasonable amount of time

2018-04-13 Thread Jacek Tomaka
> On Tue, Apr 03, 2018 at 10:08:58AM -0700, Paul E. McKenney wrote: > > On Tue, Apr 03, 2018 at 01:41:31PM +0200, Frederic Weisbecker wrote: > > > On Mon, Apr 02, 2018 at 03:04:38PM -0700, Paul E. McKenney wrote: > > > > Hello! > > > > > > > > I am hitting the following on today's mainline under rc

Re: NO_HZ_FULL and tick running within a reasonable amount of time

2018-04-07 Thread Frederic Weisbecker
On Tue, Apr 03, 2018 at 10:08:58AM -0700, Paul E. McKenney wrote: > On Tue, Apr 03, 2018 at 01:41:31PM +0200, Frederic Weisbecker wrote: > > On Mon, Apr 02, 2018 at 03:04:38PM -0700, Paul E. McKenney wrote: > > > Hello! > > > > > > I am hitting the following on today's mainline under rcutorture, b

Re: NO_HZ_FULL and tick running within a reasonable amount of time

2018-04-03 Thread Paul E. McKenney
On Tue, Apr 03, 2018 at 01:41:31PM +0200, Frederic Weisbecker wrote: > On Mon, Apr 02, 2018 at 03:04:38PM -0700, Paul E. McKenney wrote: > > Hello! > > > > I am hitting the following on today's mainline under rcutorture, but > > only on scenarios built with CONFIG_NO_HZ_FULL=y: > > > > --

Re: NO_HZ_FULL and tick running within a reasonable amount of time

2018-04-03 Thread Frederic Weisbecker
On Mon, Apr 02, 2018 at 03:04:38PM -0700, Paul E. McKenney wrote: > Hello! > > I am hitting the following on today's mainline under rcutorture, but > only on scenarios built with CONFIG_NO_HZ_FULL=y: > > > > WARNING: CPU: 0

Re: NO_HZ_FULL and tick running within a reasonable amount of time

2018-04-03 Thread Peter Zijlstra
On Mon, Apr 02, 2018 at 03:04:38PM -0700, Paul E. McKenney wrote: > The WARN_ON_ONCE() triggering is this guy: > > delta = rq_clock_task(rq) - curr->se.exec_start; > WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3); > > But given that ->se.exec_start is zeroed from time to time, for examp

NO_HZ_FULL and tick running within a reasonable amount of time

2018-04-02 Thread Paul E. McKenney
Hello! I am hitting the following on today's mainline under rcutorture, but only on scenarios built with CONFIG_NO_HZ_FULL=y: WARNING: CPU: 0 PID: 7 at /home/paulmck/public_git/linux-rcu/kernel/sched/core.c:3124 sched_tic