--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/g1/g1ConcurrentRefineThread.cpp Mon Nov 06 14:24:31 2017 +0100
@@ -0,0 +1,176 @@
+/*
+ * Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/g1/g1ConcurrentRefine.hpp"
+#include "gc/g1/g1ConcurrentRefineThread.hpp"
+#include "gc/g1/g1CollectedHeap.inline.hpp"
+#include "gc/g1/g1RemSet.hpp"
+#include "gc/shared/suspendibleThreadSet.hpp"
+#include "logging/log.hpp"
+#include "memory/resourceArea.hpp"
+#include "runtime/handles.inline.hpp"
+#include "runtime/mutexLocker.hpp"
+
+G1ConcurrentRefineThread::G1ConcurrentRefineThread(G1ConcurrentRefine* cr,
+ G1ConcurrentRefineThread *next,
+ uint worker_id_offset,
+ uint worker_id,
+ size_t activate,
+ size_t deactivate) :
+ ConcurrentGCThread(),
+ _worker_id_offset(worker_id_offset),
+ _worker_id(worker_id),
+ _active(false),
+ _next(next),
+ _monitor(NULL),
+ _cr(cr),
+ _vtime_accum(0.0),
+ _activation_threshold(activate),
+ _deactivation_threshold(deactivate)
+{
+
+ // Each thread has its own monitor. The i-th thread is responsible for signaling
+ // to thread i+1 if the number of buffers in the queue exceeds a threshold for this
+ // thread. Monitors are also used to wake up the threads during termination.
+ // The 0th (primary) worker is notified by mutator threads and has a special monitor.
+ if (!is_primary()) {
+ _monitor = new Monitor(Mutex::nonleaf, "Refinement monitor", true,
+ Monitor::_safepoint_check_never);
+ } else {
+ _monitor = DirtyCardQ_CBL_mon;
+ }
+
+ // set name
+ set_name("G1 Refine#%d", worker_id);
+ create_and_start();
+}
+
+void G1ConcurrentRefineThread::update_thresholds(size_t activate,
+ size_t deactivate) {
+ assert(deactivate < activate, "precondition");
+ _activation_threshold = activate;
+ _deactivation_threshold = deactivate;
+}
+
+void G1ConcurrentRefineThread::wait_for_completed_buffers() {
+ MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
+ while (!should_terminate() && !is_active()) {
+ _monitor->wait(Mutex::_no_safepoint_check_flag);
+ }
+}
+
+bool G1ConcurrentRefineThread::is_active() {
+ DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
+ return is_primary() ? dcqs.process_completed_buffers() : _active;
+}
+
+void G1ConcurrentRefineThread::activate() {
+ MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
+ if (!is_primary()) {
+ set_active(true);
+ } else {
+ DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
+ dcqs.set_process_completed(true);
+ }
+ _monitor->notify();
+}
+
+void G1ConcurrentRefineThread::deactivate() {
+ MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
+ if (!is_primary()) {
+ set_active(false);
+ } else {
+ DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
+ dcqs.set_process_completed(false);
+ }
+}
+
+void G1ConcurrentRefineThread::run_service() {
+ _vtime_start = os::elapsedVTime();
+
+ while (!should_terminate()) {
+ // Wait for work
+ wait_for_completed_buffers();
+ if (should_terminate()) {
+ break;
+ }
+
+ size_t buffers_processed = 0;
+ DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
+ log_debug(gc, refine)("Activated %d, on threshold: " SIZE_FORMAT ", current: " SIZE_FORMAT,
+ _worker_id, _activation_threshold, dcqs.completed_buffers_num());
+
+ {
+ SuspendibleThreadSetJoiner sts_join;
+
+ while (!should_terminate()) {
+ if (sts_join.should_yield()) {
+ sts_join.yield();
+ continue; // Re-check for termination after yield delay.
+ }
+
+ size_t curr_buffer_num = dcqs.completed_buffers_num();
+ // If the number of the buffers falls down into the yellow zone,
+ // that means that the transition period after the evacuation pause has ended.
+ if (dcqs.completed_queue_padding() > 0 && curr_buffer_num <= cr()->yellow_zone()) {
+ dcqs.set_completed_queue_padding(0);
+ }
+
+ // Check if we need to activate the next thread.
+ if ((_next != NULL) &&
+ !_next->is_active() &&
+ (curr_buffer_num > _next->_activation_threshold)) {
+ _next->activate();
+ }
+
+ // Process the next buffer, if there are enough left.
+ if (!dcqs.refine_completed_buffer_concurrently(_worker_id + _worker_id_offset, _deactivation_threshold)) {
+ break; // Deactivate, number of buffers fell below threshold.
+ }
+ ++buffers_processed;
+ }
+ }
+
+ deactivate();
+ log_debug(gc, refine)("Deactivated %d, off threshold: " SIZE_FORMAT
+ ", current: " SIZE_FORMAT ", processed: " SIZE_FORMAT,
+ _worker_id, _deactivation_threshold,
+ dcqs.completed_buffers_num(),
+ buffers_processed);
+
+ if (os::supports_vtime()) {
+ _vtime_accum = (os::elapsedVTime() - _vtime_start);
+ } else {
+ _vtime_accum = 0.0;
+ }
+ }
+
+ log_debug(gc, refine)("Stopping %d", _worker_id);
+}
+
+void G1ConcurrentRefineThread::stop_service() {
+ MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
+ _monitor->notify();
+}