RFR(XS) 8191924: Adjust DelegatingClassLoader's metadata space sizing algorithm
Zhengyu Gu
zgu at redhat.com
Tue Mar 13 17:22:21 UTC 2018
Please review this simple patch, that applies the same sizing algorithm
for anonymous class loader [1] to delegating class loader.
Delegating class loader has similar memory usage pattern as anonymous
class loader. By applying the same sizing logic, it reduces about the
same percentage of wasted memory as anonymous class loader's metedata space.
Ex.
Before:
ClassLoader: jdk/internal/reflect/DelegatingClassLoader
Metadata capacity= 5.00KB used= 1.55KB free= 3.45KB
waste= 0.04KB
Class data capacity= 1.00KB used= 0.58KB free= 0.42KB
waste= 0.00KB
After:
ClassLoader: jdk/internal/reflect/DelegatingClassLoader
Metadata capacity= 2.00KB used= 1.55KB free= 0.45KB
waste= 0.04KB
Class data capacity= 1.00KB used= 0.58KB free= 0.42KB
waste= 0.00KB
Bug: https://bugs.openjdk.java.net/browse/JDK-8191924
Webrev: http://cr.openjdk.java.net/~zgu/8191924/webrev.00/
Test:
hotspot_runtime on Linux x64 (fastdebug and release)
[1]https://bugs.openjdk.java.net/browse/JDK-8190729
Thanks,
-Zhengyu
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