RE: [Xen-devel] [PATCH] Fix softlockup issue after vcpu hotplug

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>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

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