[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] [PATCH] Fix softlockup issue after vcpu hotplug
>From: Tian Kevin >Sent: 2007年1月30日 21:12 >>>>You are confusing the two parts of the softlockup mechanism. The >thread >>is >>responsible only for periodically touching the watchdog. The warning >>mechanism is driven off the timer interrupt handler. So it is entirely >>possible for warnings to appear when the thread does not exist (in fact, >if >>the thread does not exist then we *expect* warnings to appear!). >> >> -- Keir > >I added a debug print inside the warning by: > printk(KERN_ERR "BUG: drift by 0x%lx\n", > jiffies - touch_timestamp); > >This drift doesn't increment monotonically. Most time it is about 1s >(an interesting fact!), and seldom dozen of seconds. But anyway, it >indicates that watchdog thread is still scheduled. :-) > >Thanks, >Kevin > Sorry that I mean most time 10s here. Thanks, Kevin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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