Messages in this thread | | | Date | Fri, 11 Nov 2011 08:06:15 +0100 | From | Ingo Molnar <> | Subject | Re: [GIT PULL] TSC sched_clock overflow workaround |
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* John Stultz <johnstul@us.ibm.com> wrote:
> Hey Thomas, Ingo, > I thought Peter had sent this on, but apparently its not landed yet, so > I wanted to make sure you got it. > > After ~208 days, the sched_clock multiplication overflows and > causes some false positives in the softlockup watchdog. I don't > think there are any actual panics going on, as an earlier related > div by zero issue was already fixed. However, the false positives > do continue to worry folks. > > We still need a proper fix, which will probably be in part making > sched_clock do periodic accumulation, as well as possibly changing > users of sched_clock (like the softlockup watchdog) use timekeeping > timestamps rather then sched_clock.
I'd *much* rather see a real fix for this than an ugly workaround that disables a very real speedup.
Thanks,
Ingo
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