--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp Tue Nov 22 04:47:10 2011 -0500
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp Tue Aug 09 10:16:01 2011 -0700
@@ -152,15 +152,16 @@
{
ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
uint parallel_gc_threads = heap->gc_task_manager()->workers();
+ uint active_gc_threads = heap->gc_task_manager()->active_workers();
RegionTaskQueueSet* qset = ParCompactionManager::region_array();
- ParallelTaskTerminator terminator(parallel_gc_threads, qset);
+ ParallelTaskTerminator terminator(active_gc_threads, qset);
GCTaskQueue* q = GCTaskQueue::create();
for(uint i=0; i<parallel_gc_threads; i++) {
q->enqueue(new RefProcTaskProxy(task, i));
}
if (task.marks_oops_alive()) {
if (parallel_gc_threads>1) {
- for (uint j=0; j<parallel_gc_threads; j++) {
+ for (uint j=0; j<active_gc_threads; j++) {
q->enqueue(new StealMarkingTask(&terminator));
}
}
@@ -216,7 +217,6 @@
// StealRegionCompactionTask
//
-
StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
_terminator(t) {}
@@ -229,6 +229,32 @@
ParCompactionManager* cm =
ParCompactionManager::gc_thread_compaction_manager(which);
+
+ // If not all threads are active, get a draining stack
+ // from the list. Else, just use this threads draining stack.
+ uint which_stack_index;
+ bool use_all_workers = manager->all_workers_active();
+ if (use_all_workers) {
+ which_stack_index = which;
+ assert(manager->active_workers() == ParallelGCThreads,
+ err_msg("all_workers_active has been incorrectly set: "
+ " active %d ParallelGCThreads %d", manager->active_workers(),
+ ParallelGCThreads));
+ } else {
+ which_stack_index = ParCompactionManager::pop_recycled_stack_index();
+ }
+
+ cm->set_region_stack_index(which_stack_index);
+ cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
+ if (TraceDynamicGCThreads) {
+ gclog_or_tty->print_cr("StealRegionCompactionTask::do_it "
+ "region_stack_index %d region_stack = 0x%x "
+ " empty (%d) use all workers %d",
+ which_stack_index, ParCompactionManager::region_list(which_stack_index),
+ cm->region_stack()->is_empty(),
+ use_all_workers);
+ }
+
// Has to drain stacks first because there may be regions on
// preloaded onto the stack and this thread may never have
// done a draining task. Are the draining tasks needed?
@@ -285,6 +311,50 @@
ParCompactionManager* cm =
ParCompactionManager::gc_thread_compaction_manager(which);
+ uint which_stack_index;
+ bool use_all_workers = manager->all_workers_active();
+ if (use_all_workers) {
+ which_stack_index = which;
+ assert(manager->active_workers() == ParallelGCThreads,
+ err_msg("all_workers_active has been incorrectly set: "
+ " active %d ParallelGCThreads %d", manager->active_workers(),
+ ParallelGCThreads));
+ } else {
+ which_stack_index = stack_index();
+ }
+
+ cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
+ if (TraceDynamicGCThreads) {
+ gclog_or_tty->print_cr("DrainStacksCompactionTask::do_it which = %d "
+ "which_stack_index = %d/empty(%d) "
+ "use all workers %d",
+ which, which_stack_index,
+ cm->region_stack()->is_empty(),
+ use_all_workers);
+ }
+
+ cm->set_region_stack_index(which_stack_index);
+
// Process any regions already in the compaction managers stacks.
cm->drain_region_stacks();
+
+ assert(cm->region_stack()->is_empty(), "Not empty");
+
+ if (!use_all_workers) {
+ // Always give up the region stack.
+ assert(cm->region_stack() ==
+ ParCompactionManager::region_list(cm->region_stack_index()),
+ "region_stack and region_stack_index are inconsistent");
+ ParCompactionManager::push_recycled_stack_index(cm->region_stack_index());
+
+ if (TraceDynamicGCThreads) {
+ void* old_region_stack = (void*) cm->region_stack();
+ int old_region_stack_index = cm->region_stack_index();
+ gclog_or_tty->print_cr("Pushing region stack 0x%x/%d",
+ old_region_stack, old_region_stack_index);
+ }
+
+ cm->set_region_stack(NULL);
+ cm->set_region_stack_index((uint)max_uintx);
+ }
}