On 08/04/2011 03:37 AM, Dor Laor wrote:
On 08/03/2011 05:24 PM, Eric B Munson wrote:
This set is just a rough first pass at avoiding soft lockup warnings
when a host
pauses the execution of a guest. A flag is set by the host in the
shared page
used for the pvclock when the host goes to stop the guest. When the guest
resumes and detects a soft lockup, this flag is checked and cleared
and the soft
lockup message is skipped.
While this will cover the case were the host stops a guest, there will
be other plain cases where the host is just over committed and will
cause a softlockup false positive on the guest.
Softlockup should use stolen time that makes use of the guest running
info would cover both cases
At least in the current steal time implementation, there are numerous
cases where steal time is not accounted but you'd hit a soft lockup.
Pausing an idle guest via (qemu) stop is an example. Likewise, a guest
that is descheduled while idle but then not scheduled for prolonged
periods of time would also not be accounted as steal time.
Regards,
Anthony Liguori
--
To unsubscribe from this list: send the line "unsubscribe kvm-ia64" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
