JDK-8043063 : Code aging should allocate MethodCounters when flushing a method
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 9
  • Priority: P5
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2014-05-13
  • Updated: 2014-05-30
  • Resolved: 2014-05-14
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JDK 9
9 b15Fixed
Related Reports
Relates :  
JDK-8043061 - Tiered: MethodCounters should be present for methods enqueued for compilation
Description
In some edge cases we may not have MethodCounters allocated for a method that was compiled.
Comments
Suggested fix: diff --git a/src/share/vm/runtime/sweeper.cpp b/src/share/vm/runtime/sweeper.cpp --- a/src/share/vm/runtime/sweeper.cpp +++ b/src/share/vm/runtime/sweeper.cpp @@ -615,6 +615,11 @@ // flat profiles). Check the age counter for possible data. if (UseCodeAging && make_not_entrant && (nm->is_compiled_by_c2() || nm->is_compiled_by_c1())) { MethodCounters* mc = nm->method()->method_counters(); + if (mc == NULL) { + // Sometimes we can get here without MethodCounters. For example if we run with -Xcomp. + // Try to allocate them. + mc = Method::build_method_counters(nm->method(), Thread::current()); + } if (mc != NULL) { // Snapshot the value as it's changed concurrently int age = mc->nmethod_age();
14-05-2014