author | kbarrett |
Tue, 14 Aug 2018 00:15:56 -0400 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "jvm.h" |
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#include "gc/g1/satbMarkQueue.hpp" |
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#include "gc/shared/collectedHeap.hpp" |
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#include "logging/log.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "runtime/safepoint.hpp" |
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#include "runtime/thread.hpp" |
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#include "runtime/threadSMR.hpp" |
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#include "runtime/vmThread.hpp" |
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SATBMarkQueue::SATBMarkQueue(SATBMarkQueueSet* qset, bool permanent) : |
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// SATB queues are only active during marking cycles. We create |
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// them with their active field set to false. If a thread is |
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// created during a cycle and its SATB queue needs to be activated |
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// before the thread starts running, we'll need to set its active |
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// field to true. This is done in G1SBarrierSet::on_thread_attach(). |
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PtrQueue(qset, permanent, false /* active */) |
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{ } |
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void SATBMarkQueue::flush() { |
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// Filter now to possibly save work later. If filtering empties the |
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// buffer then flush_impl can deallocate the buffer. |
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filter(); |
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flush_impl(); |
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} |
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// This method will first apply filtering to the buffer. If filtering |
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// retains a small enough collection in the buffer, we can continue to |
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// use the buffer as-is, instead of enqueueing and replacing it. |
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bool SATBMarkQueue::should_enqueue_buffer() { |
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assert(_lock == NULL || _lock->owned_by_self(), |
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"we should have taken the lock before calling this"); |
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// If G1SATBBufferEnqueueingThresholdPercent == 0 we could skip filtering. |
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// This method should only be called if there is a non-NULL buffer |
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// that is full. |
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assert(index() == 0, "pre-condition"); |
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assert(_buf != NULL, "pre-condition"); |
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filter(); |
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size_t cap = capacity(); |
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size_t percent_used = ((cap - index()) * 100) / cap; |
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bool should_enqueue = percent_used > G1SATBBufferEnqueueingThresholdPercent; |
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return should_enqueue; |
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} |
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void SATBMarkQueue::apply_closure_and_empty(SATBBufferClosure* cl) { |
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assert(SafepointSynchronize::is_at_safepoint(), |
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"SATB queues must only be processed at safepoints"); |
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if (_buf != NULL) { |
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cl->do_buffer(&_buf[index()], size()); |
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reset(); |
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} |
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} |
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#ifndef PRODUCT |
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// Helpful for debugging |
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static void print_satb_buffer(const char* name, |
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void** buf, |
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size_t index, |
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size_t capacity) { |
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tty->print_cr(" SATB BUFFER [%s] buf: " PTR_FORMAT " index: " SIZE_FORMAT |
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" capacity: " SIZE_FORMAT, |
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name, p2i(buf), index, capacity); |
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} |
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void SATBMarkQueue::print(const char* name) { |
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print_satb_buffer(name, _buf, index(), capacity()); |
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} |
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#endif // PRODUCT |
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SATBMarkQueueSet::SATBMarkQueueSet() : |
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PtrQueueSet(), |
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_shared_satb_queue(this, true /* permanent */) |
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{} |
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void SATBMarkQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock, |
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int process_completed_threshold, |
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Mutex* lock) { |
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PtrQueueSet::initialize(cbl_mon, fl_lock, process_completed_threshold, -1); |
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_shared_satb_queue.set_lock(lock); |
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} |
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#ifdef ASSERT |
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void SATBMarkQueueSet::dump_active_states(bool expected_active) { |
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log_error(gc, verify)("Expected SATB active state: %s", expected_active ? "ACTIVE" : "INACTIVE"); |
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log_error(gc, verify)("Actual SATB active states:"); |
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log_error(gc, verify)(" Queue set: %s", is_active() ? "ACTIVE" : "INACTIVE"); |
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) { |
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log_error(gc, verify)(" Thread \"%s\" queue: %s", t->name(), satb_queue_for_thread(t).is_active() ? "ACTIVE" : "INACTIVE"); |
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} |
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log_error(gc, verify)(" Shared queue: %s", shared_satb_queue()->is_active() ? "ACTIVE" : "INACTIVE"); |
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} |
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void SATBMarkQueueSet::verify_active_states(bool expected_active) { |
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// Verify queue set state |
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if (is_active() != expected_active) { |
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dump_active_states(expected_active); |
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guarantee(false, "SATB queue set has an unexpected active state"); |
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} |
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// Verify thread queue states |
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) { |
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if (satb_queue_for_thread(t).is_active() != expected_active) { |
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dump_active_states(expected_active); |
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guarantee(false, "Thread SATB queue has an unexpected active state"); |
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} |
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} |
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// Verify shared queue state |
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if (shared_satb_queue()->is_active() != expected_active) { |
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dump_active_states(expected_active); |
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guarantee(false, "Shared SATB queue has an unexpected active state"); |
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} |
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} |
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#endif // ASSERT |
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void SATBMarkQueueSet::set_active_all_threads(bool active, bool expected_active) { |
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assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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#ifdef ASSERT |
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verify_active_states(expected_active); |
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#endif // ASSERT |
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_all_active = active; |
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) { |
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satb_queue_for_thread(t).set_active(active); |
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} |
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shared_satb_queue()->set_active(active); |
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} |
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void SATBMarkQueueSet::filter_thread_buffers() { |
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) { |
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satb_queue_for_thread(t).filter(); |
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} |
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shared_satb_queue()->filter(); |
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} |
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bool SATBMarkQueueSet::apply_closure_to_completed_buffer(SATBBufferClosure* cl) { |
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BufferNode* nd = NULL; |
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{ |
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MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
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if (_completed_buffers_head != NULL) { |
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nd = _completed_buffers_head; |
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_completed_buffers_head = nd->next(); |
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if (_completed_buffers_head == NULL) _completed_buffers_tail = NULL; |
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_n_completed_buffers--; |
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if (_n_completed_buffers == 0) _process_completed = false; |
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} |
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} |
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if (nd != NULL) { |
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void **buf = BufferNode::make_buffer_from_node(nd); |
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size_t index = nd->index(); |
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size_t size = buffer_size(); |
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assert(index <= size, "invariant"); |
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cl->do_buffer(buf + index, size - index); |
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deallocate_buffer(nd); |
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return true; |
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} else { |
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return false; |
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} |
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} |
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#ifndef PRODUCT |
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// Helpful for debugging |
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#define SATB_PRINTER_BUFFER_SIZE 256 |
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void SATBMarkQueueSet::print_all(const char* msg) { |
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char buffer[SATB_PRINTER_BUFFER_SIZE]; |
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assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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tty->cr(); |
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tty->print_cr("SATB BUFFERS [%s]", msg); |
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BufferNode* nd = _completed_buffers_head; |
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int i = 0; |
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while (nd != NULL) { |
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void** buf = BufferNode::make_buffer_from_node(nd); |
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jio_snprintf(buffer, SATB_PRINTER_BUFFER_SIZE, "Enqueued: %d", i); |
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print_satb_buffer(buffer, buf, nd->index(), buffer_size()); |
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nd = nd->next(); |
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i += 1; |
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} |
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) { |
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jio_snprintf(buffer, SATB_PRINTER_BUFFER_SIZE, "Thread: %s", t->name()); |
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satb_queue_for_thread(t).print(buffer); |
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} |
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shared_satb_queue()->print("Shared"); |
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tty->cr(); |
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} |
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#endif // PRODUCT |
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void SATBMarkQueueSet::abandon_partial_marking() { |
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BufferNode* buffers_to_delete = NULL; |
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{ |
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MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
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while (_completed_buffers_head != NULL) { |
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BufferNode* nd = _completed_buffers_head; |
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_completed_buffers_head = nd->next(); |
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nd->set_next(buffers_to_delete); |
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buffers_to_delete = nd; |
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} |
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_completed_buffers_tail = NULL; |
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_n_completed_buffers = 0; |
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DEBUG_ONLY(assert_completed_buffer_list_len_correct_locked()); |
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} |
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while (buffers_to_delete != NULL) { |
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BufferNode* nd = buffers_to_delete; |
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buffers_to_delete = nd->next(); |
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deallocate_buffer(nd); |
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} |
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assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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// So we can safely manipulate these queues. |
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) { |
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satb_queue_for_thread(t).reset(); |
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} |
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shared_satb_queue()->reset(); |
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} |