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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 15:30 +0200
Message-ID <pI9cu-AJ-7@gated-at.bofh.it> (permalink)
References <pHZd7-2Kt-1@gated-at.bofh.it> <pI6Rk-7tK-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Fri, 3 Jul 2015, Wolfram Sang wrote:
> Hi Simon,
> 
> > I have observed what appears to be a regression while testing next-20150702
> > which seems to be caused by 2951d5c031a3 ("tick: broadcast: Prevent
> > livelock from event handler").
> 
> Does reverting help? I see a similar case with your branch
> renesas-devel-20150629-v4.1 which does not include both commits.

This branch has actually none of the clockevent/tick related changes
which are in next/linus tree. So 2951d5c031a3 is hardly the culprit.

> For this branch, if I select CONFIG_NO_HZ_IDLE and *no* CONFIG_HIGH_RES_TIMERS,

So with high res timers it boots. Can you please provide the output of
/proc/timer_list for that case?

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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