archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-18 10:04:42 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

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

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

7
hotspot/src/share/vm/memory/sharedHeap.cpp
View file

@ -159,9 +159,9 @@ SharedHeap::StrongRootsScope::~StrongRootsScope() {
Monitor* SharedHeap::StrongRootsScope::_lock = new Monitor(Mutex::leaf, "StrongRootsScope lock", false);
void SharedHeap::StrongRootsScope::mark_worker_done_with_threads(uint n_workers) {
// The Thread work barrier is only needed by G1.
// The Thread work barrier is only needed by G1 Class Unloading.
// No need to use the barrier if this is single-threaded code.
if (UseG1GC && n_workers > 0) {
if (UseG1GC && ClassUnloadingWithConcurrentMark && n_workers > 0) {
uint new_value = (uint)Atomic::add(1, &_n_workers_done_with_threads);
if (new_value == n_workers) {
// This thread is last. Notify the others.
@ -172,6 +172,9 @@ void SharedHeap::StrongRootsScope::mark_worker_done_with_threads(uint n_workers)
}
void SharedHeap::StrongRootsScope::wait_until_all_workers_done_with_threads(uint n_workers) {
assert(UseG1GC, "Currently only used by G1");
assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading");
// No need to use the barrier if this is single-threaded code.
if (n_workers > 0 && (uint)_n_workers_done_with_threads != n_workers) {
MonitorLockerEx ml(_lock, Mutex::_no_safepoint_check_flag);