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8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse

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Reviewed-by: mgerdin, coleenp, bdelsart
This commit is contained in:
Stefan Karlsson 2014-10-02 10:55:36 +02:00
parent 1055ae0436
commit d410f19961
19 changed files with 506 additions and 68 deletions
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13
hotspot/src/share/vm/gc_implementation/g1/concurrentMark.cpp
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@ -23,6 +23,7 @@
*/
#include "precompiled.hpp"
#include "classfile/metadataOnStackMark.hpp"
#include "classfile/symbolTable.hpp"
#include "code/codeCache.hpp"
#include "gc_implementation/g1/concurrentMark.inline.hpp"
@ -2564,17 +2565,27 @@ void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) {
G1CMTraceTime trace("Unloading", G1Log::finer());
if (ClassUnloadingWithConcurrentMark) {
// Cleaning of klasses depends on correct information from MetadataMarkOnStack. The CodeCache::mark_on_stack
// part is too slow to be done serially, so it is handled during the weakRefsWorkParallelPart phase.
// Defer the cleaning until we have complete on_stack data.
MetadataOnStackMark md_on_stack(false /* Don't visit the code cache at this point */);
bool purged_classes;
{
G1CMTraceTime trace("System Dictionary Unloading", G1Log::finest());
purged_classes = SystemDictionary::do_unloading(&g1_is_alive);
purged_classes = SystemDictionary::do_unloading(&g1_is_alive, false /* Defer klass cleaning */);
}
{
G1CMTraceTime trace("Parallel Unloading", G1Log::finest());
weakRefsWorkParallelPart(&g1_is_alive, purged_classes);
}
{
G1CMTraceTime trace("Deallocate Metadata", G1Log::finest());
ClassLoaderDataGraph::free_deallocate_lists();
}
}
if (G1StringDedup::is_enabled()) {