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8048269: Add flag to turn off class unloading after G1 concurrent mark

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Added -XX:+/-ClassUnloadingWithConcurrentMark

Reviewed-by: jmasa, brutisso, mgerdin
This commit is contained in:
Stefan Karlsson 2014-08-06 09:55:16 +02:00
parent bdeaedbd38
commit ef47f5dc0e
10 changed files with 246 additions and 82 deletions
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37
hotspot/src/share/vm/gc_implementation/g1/concurrentMark.cpp
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@ -2167,7 +2167,9 @@ void ConcurrentMark::cleanup() {
g1h->increment_total_collections();
// Clean out dead classes and update Metaspace sizes.
ClassLoaderDataGraph::purge();
if (ClassUnloadingWithConcurrentMark) {
ClassLoaderDataGraph::purge();
}
MetaspaceGC::compute_new_size();
// We reclaimed old regions so we should calculate the sizes to make
@ -2597,24 +2599,27 @@ void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) {
assert(_markStack.isEmpty(), "Marking should have completed");
// Unload Klasses, String, Symbols, Code Cache, etc.
G1RemarkGCTraceTime trace("Unloading", G1Log::finer());
bool purged_classes;
{
G1RemarkGCTraceTime trace("System Dictionary Unloading", G1Log::finest());
purged_classes = SystemDictionary::do_unloading(&g1_is_alive);
}
G1RemarkGCTraceTime trace("Unloading", G1Log::finer());
{
G1RemarkGCTraceTime trace("Parallel Unloading", G1Log::finest());
weakRefsWorkParallelPart(&g1_is_alive, purged_classes);
}
if (ClassUnloadingWithConcurrentMark) {
bool purged_classes;
if (G1StringDedup::is_enabled()) {
G1RemarkGCTraceTime trace("String Deduplication Unlink", G1Log::finest());
G1StringDedup::unlink(&g1_is_alive);
{
G1RemarkGCTraceTime trace("System Dictionary Unloading", G1Log::finest());
purged_classes = SystemDictionary::do_unloading(&g1_is_alive);
}
{
G1RemarkGCTraceTime trace("Parallel Unloading", G1Log::finest());
weakRefsWorkParallelPart(&g1_is_alive, purged_classes);
}
}
if (G1StringDedup::is_enabled()) {
G1RemarkGCTraceTime trace("String Deduplication Unlink", G1Log::finest());
G1StringDedup::unlink(&g1_is_alive);
}
}
}