Messages in this thread | | | Date | Mon, 26 Mar 2007 22:38:16 -0700 | From | Jeremy Fitzhardinge <> | Subject | [patch 0/2] softlockup watchdog improvements |
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Here's couple of patches to improve the softlockup watchdog.
The first changes the softlockup timer from using jiffies to sched_clock() as a timebase. Xen and VMI implement sched_clock() as counting unstolen time, so time stolen by the hypervisor won't cause the watchdog to bite.
The second adds per-cpu enable flags for the watchdog timer. This allows the timer to be disabled when the CPU goes into a (potentially unbounded) tickless sleep.
I know this conflicts with fix-bogus-softlockup-warning-with-sysrq-t.patch in -mm2. I think that patch incorrectly changes the behaviour of the softlockup watchdog, and a better solution is to temporarily disable the watchdog while doing something known to be cpu-consuming, like a long sysreq output.
J --
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