hg: jdk8u/hs-dev/hotspot: 8038212: Method::is_valid_method() check has performance regression impact for stackwalking

[coleen.phillimore at oracle.com]

Changeset: 7384f6a12fc1
Author:    coleenp
Date:      2014-05-15 18:23 -0400
URL:       http://hg.openjdk.java.net/jdk8u/hs-dev/hotspot/rev/7384f6a12fc1

8038212: Method::is_valid_method() check has performance regression impact for stackwalking
Summary: Only prune metaspace virtual spaces at safepoint so walking them is safe outside a safepoint.
Reviewed-by: mgerdin, mgronlun, hseigel, stefank

! src/share/vm/classfile/classLoaderData.cpp
! src/share/vm/classfile/classLoaderData.hpp
! src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
! src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
! src/share/vm/memory/allocation.cpp
! src/share/vm/memory/metaspace.cpp
! src/share/vm/memory/metaspace.hpp
! src/share/vm/oops/klass.cpp
! src/share/vm/oops/method.cpp
! src/share/vm/oops/method.hpp
! src/share/vm/runtime/os.cpp
! src/share/vm/runtime/safepoint.cpp
! src/share/vm/utilities/globalDefinitions.hpp