On 06/12/2018 05:57 PM, Ricardo Neri wrote: > diff --git a/Documentation/admin-guide/kernel-parameters.txt > b/Documentation/admin-guide/kernel-parameters.txt > index f2040d4..a8833c7 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -2577,7 +2577,7 @@ > Format: [state][,regs][,debounce][,die] > > nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels > - Format: [panic,][nopanic,][num] > + Format: [panic,][nopanic,][num,][hpet] > Valid num: 0 or 1 > 0 - turn hardlockup detector in nmi_watchdog off > 1 - turn hardlockup detector in nmi_watchdog on
This says that I can use "nmi_watchdog=hpet" without using 0 or 1. Is that correct? > @@ -2587,6 +2587,9 @@ > please see 'nowatchdog'. > This is useful when you use a panic=... timeout and > need the box quickly up again. > + When hpet is specified, the NMI watchdog will be driven > + by an HPET timer, if available in the system. Otherwise, > + the perf-based implementation will be used. > > These settings can be accessed at runtime via > the nmi_watchdog and hardlockup_panic sysctls. thanks, -- ~Randy
