--- a/src/hotspot/share/gc/g1/satbMarkQueue.cpp Fri Aug 17 21:36:02 2018 -0700
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,263 +0,0 @@
-/*
- * Copyright (c) 2001, 2018, 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/satbMarkQueue.hpp"
-#include "gc/shared/collectedHeap.hpp"
-#include "logging/log.hpp"
-#include "memory/allocation.inline.hpp"
-#include "oops/oop.inline.hpp"
-#include "runtime/mutexLocker.hpp"
-#include "runtime/os.hpp"
-#include "runtime/safepoint.hpp"
-#include "runtime/thread.hpp"
-#include "runtime/threadSMR.hpp"
-#include "runtime/vmThread.hpp"
-
-SATBMarkQueue::SATBMarkQueue(SATBMarkQueueSet* qset, bool permanent) :
- // SATB queues are only active during marking cycles. We create
- // them with their active field set to false. If a thread is
- // created during a cycle and its SATB queue needs to be activated
- // before the thread starts running, we'll need to set its active
- // field to true. This must be done in the collector-specific
- // BarrierSet::on_thread_attach() implementation.
- PtrQueue(qset, permanent, false /* active */)
-{ }
-
-void SATBMarkQueue::flush() {
- // Filter now to possibly save work later. If filtering empties the
- // buffer then flush_impl can deallocate the buffer.
- filter();
- flush_impl();
-}
-
-// This method will first apply filtering to the buffer. If filtering
-// retains a small enough collection in the buffer, we can continue to
-// use the buffer as-is, instead of enqueueing and replacing it.
-
-bool SATBMarkQueue::should_enqueue_buffer() {
- assert(_lock == NULL || _lock->owned_by_self(),
- "we should have taken the lock before calling this");
-
- // This method should only be called if there is a non-NULL buffer
- // that is full.
- assert(index() == 0, "pre-condition");
- assert(_buf != NULL, "pre-condition");
-
- filter();
-
- SATBMarkQueueSet* satb_qset = static_cast<SATBMarkQueueSet*>(qset());
- size_t threshold = satb_qset->buffer_enqueue_threshold();
- // Ensure we'll enqueue completely full buffers.
- assert(threshold > 0, "enqueue threshold = 0");
- // Ensure we won't enqueue empty buffers.
- assert(threshold <= capacity(),
- "enqueue threshold " SIZE_FORMAT " exceeds capacity " SIZE_FORMAT,
- threshold, capacity());
- return index() < threshold;
-}
-
-void SATBMarkQueue::apply_closure_and_empty(SATBBufferClosure* cl) {
- assert(SafepointSynchronize::is_at_safepoint(),
- "SATB queues must only be processed at safepoints");
- if (_buf != NULL) {
- cl->do_buffer(&_buf[index()], size());
- reset();
- }
-}
-
-#ifndef PRODUCT
-// Helpful for debugging
-
-static void print_satb_buffer(const char* name,
- void** buf,
- size_t index,
- size_t capacity) {
- tty->print_cr(" SATB BUFFER [%s] buf: " PTR_FORMAT " index: " SIZE_FORMAT
- " capacity: " SIZE_FORMAT,
- name, p2i(buf), index, capacity);
-}
-
-void SATBMarkQueue::print(const char* name) {
- print_satb_buffer(name, _buf, index(), capacity());
-}
-
-#endif // PRODUCT
-
-SATBMarkQueueSet::SATBMarkQueueSet() :
- PtrQueueSet(),
- _shared_satb_queue(this, true /* permanent */),
- _buffer_enqueue_threshold(0)
-{}
-
-void SATBMarkQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock,
- int process_completed_threshold,
- uint buffer_enqueue_threshold_percentage,
- Mutex* lock) {
- PtrQueueSet::initialize(cbl_mon, fl_lock, process_completed_threshold, -1);
- _shared_satb_queue.set_lock(lock);
- assert(buffer_size() != 0, "buffer size not initialized");
- // Minimum threshold of 1 ensures enqueuing of completely full buffers.
- size_t size = buffer_size();
- size_t enqueue_qty = (size * buffer_enqueue_threshold_percentage) / 100;
- _buffer_enqueue_threshold = MAX2(size - enqueue_qty, (size_t)1);
-}
-
-#ifdef ASSERT
-void SATBMarkQueueSet::dump_active_states(bool expected_active) {
- log_error(gc, verify)("Expected SATB active state: %s", expected_active ? "ACTIVE" : "INACTIVE");
- log_error(gc, verify)("Actual SATB active states:");
- log_error(gc, verify)(" Queue set: %s", is_active() ? "ACTIVE" : "INACTIVE");
- for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) {
- log_error(gc, verify)(" Thread \"%s\" queue: %s", t->name(), satb_queue_for_thread(t).is_active() ? "ACTIVE" : "INACTIVE");
- }
- log_error(gc, verify)(" Shared queue: %s", shared_satb_queue()->is_active() ? "ACTIVE" : "INACTIVE");
-}
-
-void SATBMarkQueueSet::verify_active_states(bool expected_active) {
- // Verify queue set state
- if (is_active() != expected_active) {
- dump_active_states(expected_active);
- guarantee(false, "SATB queue set has an unexpected active state");
- }
-
- // Verify thread queue states
- for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) {
- if (satb_queue_for_thread(t).is_active() != expected_active) {
- dump_active_states(expected_active);
- guarantee(false, "Thread SATB queue has an unexpected active state");
- }
- }
-
- // Verify shared queue state
- if (shared_satb_queue()->is_active() != expected_active) {
- dump_active_states(expected_active);
- guarantee(false, "Shared SATB queue has an unexpected active state");
- }
-}
-#endif // ASSERT
-
-void SATBMarkQueueSet::set_active_all_threads(bool active, bool expected_active) {
- assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
-#ifdef ASSERT
- verify_active_states(expected_active);
-#endif // ASSERT
- _all_active = active;
- for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) {
- satb_queue_for_thread(t).set_active(active);
- }
- shared_satb_queue()->set_active(active);
-}
-
-void SATBMarkQueueSet::filter_thread_buffers() {
- for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) {
- satb_queue_for_thread(t).filter();
- }
- shared_satb_queue()->filter();
-}
-
-bool SATBMarkQueueSet::apply_closure_to_completed_buffer(SATBBufferClosure* cl) {
- BufferNode* nd = NULL;
- {
- MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
- if (_completed_buffers_head != NULL) {
- nd = _completed_buffers_head;
- _completed_buffers_head = nd->next();
- if (_completed_buffers_head == NULL) _completed_buffers_tail = NULL;
- _n_completed_buffers--;
- if (_n_completed_buffers == 0) _process_completed = false;
- }
- }
- if (nd != NULL) {
- void **buf = BufferNode::make_buffer_from_node(nd);
- size_t index = nd->index();
- size_t size = buffer_size();
- assert(index <= size, "invariant");
- cl->do_buffer(buf + index, size - index);
- deallocate_buffer(nd);
- return true;
- } else {
- return false;
- }
-}
-
-#ifndef PRODUCT
-// Helpful for debugging
-
-#define SATB_PRINTER_BUFFER_SIZE 256
-
-void SATBMarkQueueSet::print_all(const char* msg) {
- char buffer[SATB_PRINTER_BUFFER_SIZE];
- assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
-
- tty->cr();
- tty->print_cr("SATB BUFFERS [%s]", msg);
-
- BufferNode* nd = _completed_buffers_head;
- int i = 0;
- while (nd != NULL) {
- void** buf = BufferNode::make_buffer_from_node(nd);
- os::snprintf(buffer, SATB_PRINTER_BUFFER_SIZE, "Enqueued: %d", i);
- print_satb_buffer(buffer, buf, nd->index(), buffer_size());
- nd = nd->next();
- i += 1;
- }
-
- for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) {
- os::snprintf(buffer, SATB_PRINTER_BUFFER_SIZE, "Thread: %s", t->name());
- satb_queue_for_thread(t).print(buffer);
- }
-
- shared_satb_queue()->print("Shared");
-
- tty->cr();
-}
-#endif // PRODUCT
-
-void SATBMarkQueueSet::abandon_partial_marking() {
- BufferNode* buffers_to_delete = NULL;
- {
- MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
- while (_completed_buffers_head != NULL) {
- BufferNode* nd = _completed_buffers_head;
- _completed_buffers_head = nd->next();
- nd->set_next(buffers_to_delete);
- buffers_to_delete = nd;
- }
- _completed_buffers_tail = NULL;
- _n_completed_buffers = 0;
- DEBUG_ONLY(assert_completed_buffer_list_len_correct_locked());
- }
- while (buffers_to_delete != NULL) {
- BufferNode* nd = buffers_to_delete;
- buffers_to_delete = nd->next();
- deallocate_buffer(nd);
- }
- assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
- // So we can safely manipulate these queues.
- for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) {
- satb_queue_for_thread(t).reset();
- }
- shared_satb_queue()->reset();
-}