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Re: Possible regression due to "tick: broadcast: Prevent livelock from event handler"

From Thomas Gleixner <tglx@linutronix.de>
Newsgroups linux.kernel
Subject Re: Possible regression due to "tick: broadcast: Prevent livelock from event handler"
Date 2015-07-03 17:00 +0200
Message-ID <pIaBA-1kt-19@gated-at.bofh.it> (permalink)
References (1 earlier) <pI6Rk-7tK-5@gated-at.bofh.it> <pI9cu-AJ-7@gated-at.bofh.it> <pI9ma-E1-31@gated-at.bofh.it> <pI9YS-17f-9@gated-at.bofh.it> <pIaif-1dJ-47@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Fri, 3 Jul 2015, Wolfram Sang wrote:
> > So this is a single core machine and uses the em_sti timer w/o the
> > broadcast nonsense. In Simons case it looks like em_sti is used as
> > broadcast device.
> 
> We use the same board. Just my kernel has SMP=n.
> 
> > Though the issues you see in the highres=n case might be the same as
> > the ones Simon is observing.
> 
> I hope so. One good thing about the issue I see is that it is 100%
> reproducable.
> 
> > So in that nohz=y highres=n case, does adding idle=poll on the command
> > line fix the issue?
> 
> Nope, still hangs.

Ok. So it's unrelated to deep idle states. Any chance of poking with
JTAG at the frozen box? If not, are there GPIOs which you could use to
monitor certain state?

Thanks,

	tglx


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Thread

Possible regression due to "tick: broadcast: Prevent livelock from  event handler" Simon Horman <horms@verge.net.au> - 2015-07-03 04:50 +0200
  Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Thomas Gleixner <tglx@linutronix.de> - 2015-07-03 11:30 +0200
  Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Wolfram Sang <wsa@the-dreams.de> - 2015-07-03 13:00 +0200
    Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-07-03 13:10 +0200
    Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Thomas Gleixner <tglx@linutronix.de> - 2015-07-03 15:30 +0200
      Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Wolfram Sang <wsa@the-dreams.de> - 2015-07-03 15:40 +0200
        Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Thomas Gleixner <tglx@linutronix.de> - 2015-07-03 16:20 +0200
          Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Wolfram Sang <wsa@the-dreams.de> - 2015-07-03 16:40 +0200
            Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Sudeep Holla <sudeep.holla@arm.com> - 2015-07-03 16:50 +0200
              Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Sudeep Holla <sudeep.holla@arm.com> - 2015-07-03 17:00 +0200
              Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Thomas Gleixner <tglx@linutronix.de> - 2015-07-03 17:00 +0200
            Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Thomas Gleixner <tglx@linutronix.de> - 2015-07-03 17:00 +0200
              Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Wolfram Sang <wsa@the-dreams.de> - 2015-07-03 17:20 +0200
                Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Thomas Gleixner <tglx@linutronix.de> - 2015-07-03 17:30 +0200
                Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Wolfram Sang <wsa@the-dreams.de> - 2015-07-03 17:50 +0200
                Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Thomas Gleixner <tglx@linutronix.de> - 2015-07-03 18:00 +0200
                Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Wolfram Sang <wsa@the-dreams.de> - 2015-07-03 18:10 +0200
            Re: Possible regression due to "tick: broadcast: Prevent livelock  from event handler" Geert Uytterhoeven <geert@linux-m68k.org> - 2015-07-03 19:10 +0200

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