Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU

2017-10-09 Thread Levin, Alexander (Sasha Levin)
On Mon, Oct 09, 2017 at 10:04:45AM +0200, Peter Zijlstra wrote: >On Sat, Oct 07, 2017 at 05:43:32PM +, Levin, Alexander (Sasha Levin) wrote: >> On Sat, Oct 07, 2017 at 11:15:17AM +0200, Peter Zijlstra wrote: >> >On Sat, Oct 07, 2017 at 02:07:26AM +, Levin, Alexander (Sasha Levin) >> >wrote

Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU

2017-10-09 Thread Peter Zijlstra
On Sat, Oct 07, 2017 at 05:43:32PM +, Levin, Alexander (Sasha Levin) wrote: > On Sat, Oct 07, 2017 at 11:15:17AM +0200, Peter Zijlstra wrote: > >On Sat, Oct 07, 2017 at 02:07:26AM +, Levin, Alexander (Sasha Levin) > >wrote: > >> And quite a few lines of your added trace (lmk if you need mo

Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU

2017-10-07 Thread Peter Zijlstra
On Sat, Oct 07, 2017 at 02:07:26AM +, Levin, Alexander (Sasha Levin) wrote: > And quite a few lines of your added trace (lmk if you need more, or all): Yeah, could you please upload all of it somewhere? That chunk didn't include any hotplug bits at all.

Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU

2017-10-06 Thread Levin, Alexander (Sasha Levin)
On Fri, Sep 29, 2017 at 01:11:26PM +0200, Peter Zijlstra wrote: >I can't seem to trigger :-( > >Can you please run with the below patch and: > > # echo 1 > /proc/sys/kernel/traceoff_on_warning The call stack trace looks like so: [ 2073.492089] Unregister pv shared memory for cpu 2 [ 2073.495414]

Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU

2017-09-29 Thread Peter Zijlstra
On Thu, Sep 28, 2017 at 01:42:49PM +0200, Peter Zijlstra wrote: > On Thu, Sep 28, 2017 at 11:03:10AM +, Levin, Alexander (Sasha Levin) > wrote: > > On Thu, Sep 28, 2017 at 12:35:41PM +0200, Peter Zijlstra wrote: > > >On Thu, Sep 28, 2017 at 02:14:15AM -0700, Sasha Levin wrote: > > > >> [20355

Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU

2017-09-28 Thread Peter Zijlstra
On Thu, Sep 28, 2017 at 11:03:10AM +, Levin, Alexander (Sasha Levin) wrote: > On Thu, Sep 28, 2017 at 12:35:41PM +0200, Peter Zijlstra wrote: > >On Thu, Sep 28, 2017 at 02:14:15AM -0700, Sasha Levin wrote: > >> [2035565360.446794] Unregister pv shared memory for cpu 2 > >> [2035565360.467930]

Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU

2017-09-28 Thread Levin, Alexander (Sasha Levin)
On Thu, Sep 28, 2017 at 12:35:41PM +0200, Peter Zijlstra wrote: >On Thu, Sep 28, 2017 at 02:14:15AM -0700, Sasha Levin wrote: >> On Thu, Sep 7, 2017 at 8:03 AM, Peter Zijlstra wrote: >> > Migrating tasks to offline CPUs is a pretty big fail, warn about it. >> >> Hey Peter, >> >> This seems to get

Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU

2017-09-28 Thread Peter Zijlstra
On Thu, Sep 28, 2017 at 02:14:15AM -0700, Sasha Levin wrote: > On Thu, Sep 7, 2017 at 8:03 AM, Peter Zijlstra wrote: > > Migrating tasks to offline CPUs is a pretty big fail, warn about it. > > Hey Peter, > > This seems to get hit on the latest -next: > > [2035565360.446794] Unregister pv share

Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU

2017-09-28 Thread Sasha Levin
On Thu, Sep 7, 2017 at 8:03 AM, Peter Zijlstra wrote: > Migrating tasks to offline CPUs is a pretty big fail, warn about it. Hey Peter, This seems to get hit on the latest -next: [2035565360.446794] Unregister pv shared memory for cpu 2 [2035565360.467930] numa_remove_cpu cpu 2 node 2: mask now

[PATCH 3/4] sched: WARN when migrating to an offline CPU

2017-09-07 Thread Peter Zijlstra
Migrating tasks to offline CPUs is a pretty big fail, warn about it. Signed-off-by: Peter Zijlstra (Intel) --- kernel/sched/core.c |4 1 file changed, 4 insertions(+) --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1173,6 +1173,10 @@ void set_task_cpu(struct task_struct *p,