Review request (S) JDK-8004241 NPG: Metaspace occupies more memory than specified by -XX:MaxMetaspaceSize option

Srinivas Ramakrishna ysr1729 at gmail.com
Wed Mar 20 12:49:46 PDT 2013


One somewhat weakly related question (pardon the abuse of this thread,
but I figured it might be easy to get a quick response since we are on
the topic of NPG :-) : In what release of HS (HSXX.X-BXX) did NPG get
enabled?

thanks!
-- ramki

On Wed, Mar 20, 2013 at 9:30 AM, John Cuthbertson
<john.cuthbertson at oracle.com> wrote:
> Hi Mikael,
>
> Your change looks good to me.
>
> Cheers,
>
> JohnC
>
>
> On 3/7/2013 12:54 AM, Mikael Gerdin wrote:
>>
>> Hi
>>
>>
>> When deciding when to reserve more metaspace memory we erroneously looked
>> only at the "capacity" of the metaspace insted of the reserved space (which
>> is what we ask this function when expanding).
>>
>> Additionally, we didn't check MaxMetaspaceSize against the sum of
>> reserved(Class) + reserved(NonClass) which caused us to use more than
>> MaxMetaspaceSize even when it was set.
>>
>> Bug:
>> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8004241
>> (not yet available at the time of writing this mail)
>>
>> Webrev:
>> http://cr.openjdk.java.net/~mgerdin/8004241/webrev.0
>>
>> Testing:
>> JPRT with -XX:MaxMetaspaceSize set for all tests to exercise the code
>> path.
>
>


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