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8220465: Use shadow regions for faster ParallelGC full GCs

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Reviewed-by: sjohanss, tschatzl
This commit is contained in:
Haoyu Li 2019-10-23 21:28:24 +08:00 • committed by Stefan Johansson
parent 026eac269c
commit 7eadf5b372
4 changed files with 326 additions and 40 deletions
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37
src/hotspot/share/gc/parallel/psCompactionManager.cpp
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@ -49,6 +49,8 @@ ParCompactionManager::ObjArrayTaskQueueSet*
ObjectStartArray* ParCompactionManager::_start_array = NULL;
ParMarkBitMap* ParCompactionManager::_mark_bitmap = NULL;
RegionTaskQueueSet* ParCompactionManager::_region_array = NULL;
GrowableArray<size_t >* ParCompactionManager::_shadow_region_array = NULL;
Monitor* ParCompactionManager::_shadow_region_monitor = NULL;
ParCompactionManager::ParCompactionManager() :
_action(CopyAndUpdate) {
@ -99,6 +101,11 @@ void ParCompactionManager::initialize(ParMarkBitMap* mbm) {
"Could not create ParCompactionManager");
assert(ParallelScavengeHeap::heap()->workers().total_workers() != 0,
"Not initialized?");
_shadow_region_array = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<size_t >(10, true);
_shadow_region_monitor = new Monitor(Mutex::barrier, "CompactionManager monitor",
Mutex::_allow_vm_block_flag, Monitor::_safepoint_check_never);
}
void ParCompactionManager::reset_all_bitmap_query_caches() {
@ -163,3 +170,33 @@ void ParCompactionManager::drain_region_stacks() {
}
} while (!region_stack()->is_empty());
}
size_t ParCompactionManager::pop_shadow_region_mt_safe(PSParallelCompact::RegionData* region_ptr) {
MonitorLocker ml(_shadow_region_monitor, Mutex::_no_safepoint_check_flag);
while (true) {
if (!_shadow_region_array->is_empty()) {
return _shadow_region_array->pop();
}
// Check if the corresponding heap region is available now.
// If so, we don't need to get a shadow region anymore, and
// we return InvalidShadow to indicate such a case.
if (region_ptr->claimed()) {
return InvalidShadow;
}
ml.wait(1);
}
}
void ParCompactionManager::push_shadow_region_mt_safe(size_t shadow_region) {
MonitorLocker ml(_shadow_region_monitor, Mutex::_no_safepoint_check_flag);
_shadow_region_array->push(shadow_region);
ml.notify();
}
void ParCompactionManager::push_shadow_region(size_t shadow_region) {
_shadow_region_array->push(shadow_region);
}
void ParCompactionManager::remove_all_shadow_regions() {
_shadow_region_array->clear();
}