Re: [PATCH] hrtimer: Reset hrtimer cpu base proper on CPU hotplug

2018-01-31 Thread Paul E. McKenney
On Tue, Jan 30, 2018 at 10:03:17PM +0100, Thomas Gleixner wrote: > On Mon, 29 Jan 2018, Paul E. McKenney wrote: > > > On Mon, Jan 29, 2018 at 01:57:38AM -0800, Paul E. McKenney wrote: > > > On Mon, Jan 29, 2018 at 09:20:48AM +0100, Sebastian Sewior wrote: > > > > On 2018-01-26 14:09:17 [-0800], Pa

Re: [PATCH] hrtimer: Reset hrtimer cpu base proper on CPU hotplug

2018-01-30 Thread Thomas Gleixner
On Mon, 29 Jan 2018, Paul E. McKenney wrote: > On Mon, Jan 29, 2018 at 01:57:38AM -0800, Paul E. McKenney wrote: > > On Mon, Jan 29, 2018 at 09:20:48AM +0100, Sebastian Sewior wrote: > > > On 2018-01-26 14:09:17 [-0800], Paul E. McKenney wrote: > > > > find this one. ;-) But it did pass rcutortu

Re: [PATCH] hrtimer: Reset hrtimer cpu base proper on CPU hotplug

2018-01-30 Thread Paul E. McKenney
On Mon, Jan 29, 2018 at 01:57:38AM -0800, Paul E. McKenney wrote: > On Mon, Jan 29, 2018 at 09:20:48AM +0100, Sebastian Sewior wrote: > > On 2018-01-26 14:09:17 [-0800], Paul E. McKenney wrote: > > > find this one. ;-) But it did pass rcutorture testing for a great many > > > years, didn't it? :

Re: [PATCH] hrtimer: Reset hrtimer cpu base proper on CPU hotplug

2018-01-29 Thread Paul E. McKenney
On Mon, Jan 29, 2018 at 09:20:48AM +0100, Sebastian Sewior wrote: > On 2018-01-26 14:09:17 [-0800], Paul E. McKenney wrote: > > find this one. ;-) But it did pass rcutorture testing for a great many > > years, didn't it? :-/ > > It started to trigger better (or at all) on our test box with >

Re: [PATCH] hrtimer: Reset hrtimer cpu base proper on CPU hotplug

2018-01-29 Thread Sebastian Sewior
On 2018-01-26 14:09:17 [-0800], Paul E. McKenney wrote: > find this one. ;-) But it did pass rcutorture testing for a great many > years, didn't it? :-/ It started to trigger better (or at all) on our test box with modprobe kvm_intel preemption_timer=n on the host kernel so maybe a com

Re: [PATCH] hrtimer: Reset hrtimer cpu base proper on CPU hotplug

2018-01-27 Thread Paul E. McKenney
On Fri, Jan 26, 2018 at 02:09:17PM -0800, Paul E. McKenney wrote: > On Fri, Jan 26, 2018 at 02:54:32PM +0100, Thomas Gleixner wrote: > > The hrtimer interrupt code contains a hang detection and mitigation > > mechanism, which prevents that a long delayed hrtimer interrupt causes a > > continous ret

Re: [PATCH] hrtimer: Reset hrtimer cpu base proper on CPU hotplug

2018-01-26 Thread Paul E. McKenney
On Fri, Jan 26, 2018 at 02:54:32PM +0100, Thomas Gleixner wrote: > The hrtimer interrupt code contains a hang detection and mitigation > mechanism, which prevents that a long delayed hrtimer interrupt causes a > continous retriggering of interrupts which prevent the system from making > progress. I