linux-kernel - Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because the skew is too large:

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Date:	Thu, 30 Jun 2016 12:29:44 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>, x86-ml <x86@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because
 the skew is too large:

On Thu, 2016-06-30 at 11:49 +0200, Mike Galbraith wrote:
> On Thu, 2016-06-30 at 11:42 +0200, Thomas Gleixner wrote:
> 
> > So there was no watchdog firing for 525 seconds ????
> 
> Yup, seems so.

"fired" at the top, the other above if (atomic_read(&watchdog_reset...

vogelweide:/sys/kernel/debug/tracing/:[0]# tail trace
          <idle>-0     [055] ..s.   324.428369: clocksource_watchdog: fired
          <idle>-0     [055] ..s.   324.428374: clocksource_watchdog: cs_nsec: 16032486 wd_nsec: 16032765 delta: 279 wdnow: 351147182  wdlast: 350917622 watchdog->mask: ffffffff
             nis-5876  [056] ..s.   324.428403: clocksource_watchdog: fired
             nis-5876  [056] ..s.   324.428412: clocksource_watchdog: cs_nsec: 37227 wd_nsec: 37574 delta: 347 wdnow: 351147720  wdlast: 351147182 watchdog->mask: ffffffff
          <idle>-0     [057] ..s.   324.428428: clocksource_watchdog: fired
          <idle>-0     [057] ..s.   324.428433: clocksource_watchdog: cs_nsec: 21938 wd_nsec: 21301 delta: 637 wdnow: 351148025  wdlast: 351147720 watchdog->mask: ffffffff
       automount-5406  [059] ..s.   394.446498: clocksource_watchdog: fired
       automount-5406  [059] ..s.   394.446503: clocksource_watchdog: cs_nsec: 26670906785 wd_nsec: 26670888107 delta: 18678 wdnow: 1353664854  wdlast: 971786304 watchdog->mask: ffffffff
          ypbind-5385  [060] ..s.   561.325932: clocksource_watchdog: fired
          ypbind-5385  [060] ..s.   561.325937: clocksource_watchdog: cs_nsec: 166877142176 wd_nsec: 0 delta: 166877142176 wdnow: 3743040056  wdlast: 1353664854 watchdog->mask: ffffffff
vogelweide:/sys/kernel/debug/tracing/:[0]#