Fwd: RFR: 8175917: [JVMCI] Avoid long JNI handle chains
christian.haeubl at oracle.com
Thu Mar 2 15:47:01 UTC 2017
Please review the following patch for
When Truffle uses JMVCI and Graal for compiling a guest language (e.g.
the JVMCI method "installCode" uses lots of local JNI references when
generating the corresponding debug information so that the thread's
top-level JNI handle buffer will have a large size. This unnecessarily
increases the footprint and significantly decreases the performance (as
long as https://bugs.openjdk.java.net/browse/JDK-8175318 is not fixed).
Around the JVMCI method "installCode", we do something similar to JNI's
PushLocalFrame/PopLocalFrame. So, the large JNI handle buffer is
released when the method exits and the thread's top-level JNI handle
buffer is not getting enlarged.
The changes were tested locally by executing JVMCI bootstrapping and
parts of Graal / Truffle.
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