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6672778: G1 should trim task queues more aggressively during evacuation pauses

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Regularly try to drain task queues. This helps memory usage and performance during garbage collection.

Reviewed-by: sjohanss, sangheki
This commit is contained in:
Thomas Schatzl 2018-04-27 12:06:46 +02:00
parent 893bd31647
commit 0f583c7817
24 changed files with 315 additions and 570 deletions
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24
src/hotspot/share/gc/g1/g1ParScanThreadState.cpp
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@ -43,11 +43,15 @@ G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, uint worker_id,
_dcq(&g1h->dirty_card_queue_set()),
_ct(g1h->card_table()),
_closures(NULL),
_plab_allocator(NULL),
_age_table(false),
_tenuring_threshold(g1h->g1_policy()->tenuring_threshold()),
_scanner(g1h, this),
_hash_seed(17),
_worker_id(worker_id),
_tenuring_threshold(g1h->g1_policy()->tenuring_threshold()),
_age_table(false),
_scanner(g1h, this),
_stack_trim_upper_threshold(GCDrainStackTargetSize * 2 + 1),
_stack_trim_lower_threshold(GCDrainStackTargetSize),
_trim_ticks(),
_old_gen_is_full(false)
{
// we allocate G1YoungSurvRateNumRegions plus one entries, since
@ -138,16 +142,8 @@ bool G1ParScanThreadState::verify_task(StarTask ref) const {
void G1ParScanThreadState::trim_queue() {
StarTask ref;
do {
// Drain the overflow stack first, so other threads can steal.
while (_refs->pop_overflow(ref)) {
if (!_refs->try_push_to_taskqueue(ref)) {
dispatch_reference(ref);
}
}
while (_refs->pop_local(ref)) {
dispatch_reference(ref);
}
// Fully drain the queue.
trim_queue_to_threshold(0);
} while (!_refs->is_empty());
}
@ -314,7 +310,7 @@ oop G1ParScanThreadState::copy_to_survivor_space(InCSetState const state,
// length field of the from-space object.
arrayOop(obj)->set_length(0);
oop* old_p = set_partial_array_mask(old);
push_on_queue(old_p);
do_oop_partial_array(old_p);
} else {
HeapRegion* const to_region = _g1h->heap_region_containing(obj_ptr);
_scanner.set_region(to_region);