[Xen-devel] [RFC] [PATCH] One watchdog trips the watchdog on all processors

[George Dunlap <dunlapg@xxxxxxxxx>]

I've been using the watchdog timer recently to debug deadlocks, and
found that it only triggers on one cpu.  Unfortunately, if your
deadlock is not symmetric, it's not often obvious what the other
cpu(s) is(are) doing.  The attached patch is a hack I put in place to
trigger an NMI on all cpus if it's triggered on one.  This will cause
things to hang instead of reboot, however, so I'm not sure how to
integrate it into the normal watchdog-for-reliability functionality
(as opposed to watchdog-for-debugging).

 -George

Attachment: watchdog-triggers-all-cpus.diff
Description: Text Data

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