Hi all,
Currently, xend would compute elapse time since vm starts before restarting a
vm. If the elapse time is larger than MINIMUM_RESTART_TIME (which is 60s), xend
would refuse to restart the vm but destroy it to avoid loops. However, when a
guest crashes at boot time and enable-dump is enabled, core dump is done before
restarting the guest which may take quite a while (depends on memory size of
the guest). At this situation, elapse time computed is expanded thus xend
wouldn't destory the guest. Then the guest drops into a restart-crash-dumpcore
loop, which is either a waist of cpu time or *disk space* of Domain0.
Actually, I have hit this problem when I upgraded a 2048M guest to a
problematic kernel. The guest crashed at boot time and core dump was done for
it, after which the guest rebooted and go-through the previous steps. My
domain0 was full of core dump files of that guest. So does it make sense to
figure out a way to solve the problem but not just enlarging
MINIMUM_RESTART_TIME? Is the following patch reasonable?
diff -r 774dfc178c39 tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py Thu Aug 12 17:06:21 2010 +0100
+++ b/tools/python/xen/xend/XendDomainInfo.py Mon Aug 16 12:16:45 2010 +0800
@@ -2060,7 +2060,7 @@
log.warn('Domain has crashed: name=%s id=%d.',
self.info['name_label'], self.domid)
self._writeVm(LAST_SHUTDOWN_REASON, 'crash')
-
+ self.info['crash_time'] = time.time()
restart_reason = 'crash'
self._stateSet(DOM_STATE_HALTED)
@@ -2188,7 +2188,12 @@
old_domid = self.domid
self._writeVm(RESTART_IN_PROGRESS, 'True')
- elapse = time.time() - self.info['start_time']
+ if xoptions.get_enable_dump() or self.get_on_crash() \
+ in ['coredump_and_destroy', 'coredump_and_restart']:
+ elapse = self.info['crash_time'] - self.info['start_time']
+ else:
+ elapse = time.time() - self.info['start_time']
+
if elapse < MINIMUM_RESTART_TIME:
log.error('VM %s restarting too fast (Elapsed time: %f seconds). '
'Refusing to restart to avoid loops.',
I have test the situation with the patch, and it works well when the guest
crashes at boot time.
Best Regards.
Yufang
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