How to exercise the GC notification code in gcNotifier.cpp

John Cuthbertson john.cuthbertson at oracle.com
Thu Aug 4 15:12:27 PDT 2011


Hi Everyone,

After investigating an issue that was reported while running a fairly 
substantial application, I believe I have found naked oop in the GC 
notification code which I think is the cause of the problem The oop in 
question is the muKlass oop in createGCInfo in gcNotifier.cpp. This code 
is executed by the ServiceThread as part of the sendNotification routine 
which pulls items from some request queue. The items on this queue seem 
to be added as a result of GC end events being pushed by the 
MemoryManagerService if the routine 
GCMemoryManager::is_notification_enabled() returns true. This field is 
set to true by the routine jmm_SetGCNotificationEnabled in 
management.cpp. Can anyone tell me how I can explicitly exercise this 
code? I have tried some things in jconsole and jvisualvm but have so far 
been unsuccessful.

Thanks,

JohnC


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