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Re: [tip:sched/core] sched/core: Add debugging code to catch missing update_rq_clock() calls

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [tip:sched/core] sched/core: Add debugging code to catch missing update_rq_clock() calls
Date 2017-02-03 10:00 +0100
Message-ID <t6HSO-7MR-9@gated-at.bofh.it> (permalink)
References (4 earlier) <t5EtY-8qc-3@gated-at.bofh.it> <t5F6F-bX-7@gated-at.bofh.it> <t5KpI-3sq-11@gated-at.bofh.it> <t6rXI-5Vl-21@gated-at.bofh.it> <t6DPb-59x-1@gated-at.bofh.it>
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On Fri, Feb 03, 2017 at 10:03:14AM +0530, Sachin Sant wrote:
> 
> > On 02-Feb-2017, at 9:25 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> > 
> > On Tue, Jan 31, 2017 at 10:22:47AM -0700, Ross Zwisler wrote:
> >> On Tue, Jan 31, 2017 at 4:48 AM, Mike Galbraith <efault@gmx.de> wrote:
> >>> On Tue, 2017-01-31 at 16:30 +0530, Sachin Sant wrote:
> > 
> > 
> > Could some of you test this? It seems to cure things in my (very)
> > limited testing.
> > 
> 
> I ran few cycles of cpu hot(un)plug tests. In most cases it works except one
> where I ran into rcu stall:
> 
> [  173.493453] INFO: rcu_sched detected stalls on CPUs/tasks:
> [  173.493473] 	8-...: (2 GPs behind) idle=006/140000000000000/0 softirq=0/0 fqs=2996 
> [  173.493476] 	(detected by 0, t=6002 jiffies, g=885, c=884, q=6350)

Right, I actually saw that too, but I don't think that would be related
to my patch. I'll see if I can dig into this though, ought to get fixed
regardless.

Thanks for testing!

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Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls Matt Fleming <matt@codeblueprint.co.uk> - 2017-01-30 22:40 +0100
  Re: [tip:sched/core] sched/core: Add debugging code to catch missing update_rq_clock() calls Michael Ellerman <mpe@ellerman.id.au> - 2017-01-31 09:40 +0100
  Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls Sachin Sant <sachinp@linux.vnet.ibm.com> - 2017-01-31 12:10 +0100
    Re: [tip:sched/core] sched/core: Add debugging code to catch  missing update_rq_clock() calls Mike Galbraith <efault@gmx.de> - 2017-01-31 12:50 +0100
      Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls Ross Zwisler <zwisler@gmail.com> - 2017-01-31 18:30 +0100
        Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls Peter Zijlstra <peterz@infradead.org> - 2017-02-02 17:00 +0100
          Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls Matt Fleming <matt@codeblueprint.co.uk> - 2017-02-02 23:10 +0100
          Re: [tip:sched/core] sched/core: Add debugging code to catch  missing update_rq_clock() calls Mike Galbraith <efault@gmx.de> - 2017-02-03 04:10 +0100
          Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls Sachin Sant <sachinp@linux.vnet.ibm.com> - 2017-02-03 05:40 +0100
            Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls Peter Zijlstra <peterz@infradead.org> - 2017-02-03 10:00 +0100
              Re: [tip:sched/core] sched/core: Add debugging code to catch  missing update_rq_clock() calls Mike Galbraith <efault@gmx.de> - 2017-02-03 14:10 +0100
                Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls Peter Zijlstra <peterz@infradead.org> - 2017-02-03 14:40 +0100
                Re: [tip:sched/core] sched/core: Add debugging code to catch  missing update_rq_clock() calls Mike Galbraith <efault@gmx.de> - 2017-02-03 15:00 +0100
                Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-02-03 16:50 +0100
                Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-02-03 17:00 +0100
                Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls Sachin Sant <sachinp@linux.vnet.ibm.com> - 2017-02-06 07:30 +0100
                Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-02-06 16:20 +0100
                Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-02-06 16:20 +0100
          Re: [tip:sched/core] sched/core: Add debugging code to catch missing  update_rq_clock() calls Borislav Petkov <bp@alien8.de> - 2017-02-03 14:10 +0100

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