RR(S): 8020943: Memory leak when GCNotifier uses create_from_platform_dependent_str()

Mikael Gerdin mikael.gerdin at oracle.com
Wed Jul 31 10:24:23 UTC 2013


On 07/31/2013 11:45 AM, Kevin Walls wrote:
> Hi,
> I'd like to get a review on this small change:
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8020943
> https://jbs.oracle.com/bugs/browse/JDK-8020943
> webrev
> http://cr.openjdk.java.net/~kevinw/8020943/webrev.00/

Looks good to me.


> It turns out there's a leak in the gc notifier: reproduce by attaching
> e.g. JConsole and watching, if there is frequent GC the number of
> apparently unowned String objects that can't get collect continually
> increases.
> In the notifier, the method it calls to create String objects involves a
> JNI call that leaves a Handle behind and doesn't get cleared.   There is
> a simpler method to call, there is no need for all that work, as we are
> dealing with a small set of simple strings in the JVM being converted,
> to describe the collection type, cause, ...
> Thanks
> Kevin

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