author | jwilhelm |
Wed, 14 Feb 2018 13:29:45 +0100 | |
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/* |
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* Copyright (c) 2001, 2017, 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/g1CollectedHeap.inline.hpp" |
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#include "gc/g1/satbMarkQueue.hpp" |
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#include "gc/shared/collectedHeap.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 JavaThread::initialize_queues(). |
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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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// Return true if a SATB buffer entry refers to an object that |
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// requires marking. |
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// |
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// The entry must point into the G1 heap. In particular, it must not |
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// be a NULL pointer. NULL pointers are pre-filtered and never |
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// inserted into a SATB buffer. |
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// |
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// An entry that is below the NTAMS pointer for the containing heap |
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// region requires marking. Such an entry must point to a valid object. |
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// |
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// An entry that is at least the NTAMS pointer for the containing heap |
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// region might be any of the following, none of which should be marked. |
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// |
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// * A reference to an object allocated since marking started. |
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// According to SATB, such objects are implicitly kept live and do |
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// not need to be dealt with via SATB buffer processing. |
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// |
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// * A reference to a young generation object. Young objects are |
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// handled separately and are not marked by concurrent marking. |
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// |
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// * A stale reference to a young generation object. If a young |
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// generation object reference is recorded and not filtered out |
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// before being moved by a young collection, the reference becomes |
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// stale. |
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// |
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// * A stale reference to an eagerly reclaimed humongous object. If a |
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// humongous object is recorded and then reclaimed, the reference |
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// becomes stale. |
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// |
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// The stale reference cases are implicitly handled by the NTAMS |
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// comparison. Because of the possibility of stale references, buffer |
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// processing must be somewhat circumspect and not assume entries |
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// in an unfiltered buffer refer to valid objects. |
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inline bool requires_marking(const void* entry, G1CollectedHeap* heap) { |
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// Includes rejection of NULL pointers. |
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assert(heap->is_in_reserved(entry), |
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"Non-heap pointer in SATB buffer: " PTR_FORMAT, p2i(entry)); |
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HeapRegion* region = heap->heap_region_containing(entry); |
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assert(region != NULL, "No region for " PTR_FORMAT, p2i(entry)); |
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if (entry >= region->next_top_at_mark_start()) { |
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return false; |
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} |
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assert(oopDesc::is_oop(oop(entry), true /* ignore mark word */), |
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"Invalid oop in SATB buffer: " PTR_FORMAT, p2i(entry)); |
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return true; |
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} |
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inline bool retain_entry(const void* entry, G1CollectedHeap* heap) { |
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return requires_marking(entry, heap) && !heap->isMarkedNext((oop)entry); |
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} |
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// This method removes entries from a SATB buffer that will not be |
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// useful to the concurrent marking threads. Entries are retained if |
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// they require marking and are not already marked. Retained entries |
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// are compacted toward the top of the buffer. |
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void SATBMarkQueue::filter() { |
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G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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void** buf = _buf; |
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if (buf == NULL) { |
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// nothing to do |
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return; |
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} |
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// Two-fingered compaction toward the end. |
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void** src = &buf[index()]; |
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void** dst = &buf[capacity()]; |
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assert(src <= dst, "invariant"); |
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for ( ; src < dst; ++src) { |
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// Search low to high for an entry to keep. |
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void* entry = *src; |
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if (retain_entry(entry, g1h)) { |
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// Found keeper. Search high to low for an entry to discard. |
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while (src < --dst) { |
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if (!retain_entry(*dst, g1h)) { |
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*dst = entry; // Replace discard with keeper. |
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break; |
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} |
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} |
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// If discard search failed (src == dst), the outer loop will also end. |
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} |
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} |
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// dst points to the lowest retained entry, or the end of the buffer |
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// if all the entries were filtered out. |
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set_index(dst - buf); |
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} |
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// This method will first apply the above filtering to the buffer. If |
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// post-filtering a large enough chunk of the buffer has been cleared |
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// we can re-use the buffer (instead of enqueueing it) and we can just |
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// allow the mutator to carry on executing using the same buffer |
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// instead of 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(); |
166 |
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; |
169 |
} |
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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()); |
176 |
reset(); |
|
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} |
178 |
} |
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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, |
184 |
void** buf, |
|
185 |
size_t index, |
|
186 |
size_t capacity) { |
|
187 |
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) { |
193 |
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 */) { } |
1374 | 201 |
|
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void SATBMarkQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock, |
|
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int process_completed_threshold, |
1374 | 204 |
Mutex* lock) { |
4481 | 205 |
PtrQueueSet::initialize(cbl_mon, fl_lock, process_completed_threshold, -1); |
1374 | 206 |
_shared_satb_queue.set_lock(lock); |
207 |
} |
|
208 |
||
209 |
void SATBMarkQueueSet::handle_zero_index_for_thread(JavaThread* t) { |
|
210 |
t->satb_mark_queue().handle_zero_index(); |
|
211 |
} |
|
212 |
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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(), t->satb_mark_queue().is_active() ? "ACTIVE" : "INACTIVE"); |
22497 | 220 |
} |
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log_error(gc, verify)(" Shared queue: %s", shared_satb_queue()->is_active() ? "ACTIVE" : "INACTIVE"); |
22497 | 222 |
} |
223 |
||
224 |
void SATBMarkQueueSet::verify_active_states(bool expected_active) { |
|
225 |
// Verify queue set state |
|
226 |
if (is_active() != expected_active) { |
|
227 |
dump_active_states(expected_active); |
|
228 |
guarantee(false, "SATB queue set has an unexpected active state"); |
|
229 |
} |
|
230 |
||
231 |
// Verify thread queue states |
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) { |
22497 | 233 |
if (t->satb_mark_queue().is_active() != expected_active) { |
234 |
dump_active_states(expected_active); |
|
235 |
guarantee(false, "Thread SATB queue has an unexpected active state"); |
|
236 |
} |
|
237 |
} |
|
238 |
||
239 |
// Verify shared queue state |
|
240 |
if (shared_satb_queue()->is_active() != expected_active) { |
|
241 |
dump_active_states(expected_active); |
|
242 |
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 |
22497 | 250 |
verify_active_states(expected_active); |
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#endif // ASSERT |
22497 | 252 |
_all_active = active; |
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) { |
22497 | 254 |
t->satb_mark_queue().set_active(active); |
1374 | 255 |
} |
22497 | 256 |
shared_satb_queue()->set_active(active); |
1374 | 257 |
} |
258 |
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void SATBMarkQueueSet::filter_thread_buffers() { |
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) { |
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t->satb_mark_queue().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) { |
4481 | 267 |
BufferNode* nd = NULL; |
1374 | 268 |
{ |
269 |
MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
|
270 |
if (_completed_buffers_head != NULL) { |
|
271 |
nd = _completed_buffers_head; |
|
4481 | 272 |
_completed_buffers_head = nd->next(); |
1374 | 273 |
if (_completed_buffers_head == NULL) _completed_buffers_tail = NULL; |
274 |
_n_completed_buffers--; |
|
275 |
if (_n_completed_buffers == 0) _process_completed = false; |
|
276 |
} |
|
277 |
} |
|
278 |
if (nd != NULL) { |
|
4481 | 279 |
void **buf = BufferNode::make_buffer_from_node(nd); |
46443 | 280 |
size_t index = nd->index(); |
281 |
size_t size = buffer_size(); |
|
37065 | 282 |
assert(index <= size, "invariant"); |
283 |
cl->do_buffer(buf + index, size - index); |
|
284 |
deallocate_buffer(nd); |
|
1374 | 285 |
return true; |
286 |
} else { |
|
287 |
return false; |
|
288 |
} |
|
289 |
} |
|
290 |
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#ifndef PRODUCT |
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292 |
// Helpful for debugging |
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293 |
|
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#define SATB_PRINTER_BUFFER_SIZE 256 |
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|
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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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299 |
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tty->cr(); |
301 |
tty->print_cr("SATB BUFFERS [%s]", msg); |
|
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302 |
|
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BufferNode* nd = _completed_buffers_head; |
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304 |
int i = 0; |
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305 |
while (nd != NULL) { |
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306 |
void** buf = BufferNode::make_buffer_from_node(nd); |
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307 |
jio_snprintf(buffer, SATB_PRINTER_BUFFER_SIZE, "Enqueued: %d", i); |
46443 | 308 |
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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311 |
} |
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312 |
|
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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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t->satb_mark_queue().print(buffer); |
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316 |
} |
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317 |
|
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shared_satb_queue()->print("Shared"); |
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35061 | 320 |
tty->cr(); |
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} |
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#endif // PRODUCT |
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323 |
|
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void SATBMarkQueueSet::abandon_partial_marking() { |
4481 | 325 |
BufferNode* buffers_to_delete = NULL; |
1374 | 326 |
{ |
327 |
MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
|
328 |
while (_completed_buffers_head != NULL) { |
|
4481 | 329 |
BufferNode* nd = _completed_buffers_head; |
330 |
_completed_buffers_head = nd->next(); |
|
331 |
nd->set_next(buffers_to_delete); |
|
1374 | 332 |
buffers_to_delete = nd; |
333 |
} |
|
334 |
_completed_buffers_tail = NULL; |
|
335 |
_n_completed_buffers = 0; |
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DEBUG_ONLY(assert_completed_buffer_list_len_correct_locked()); |
1374 | 337 |
} |
338 |
while (buffers_to_delete != NULL) { |
|
4481 | 339 |
BufferNode* nd = buffers_to_delete; |
340 |
buffers_to_delete = nd->next(); |
|
37065 | 341 |
deallocate_buffer(nd); |
1374 | 342 |
} |
343 |
assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
|
344 |
// So we can safely manipulate these queues. |
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) { |
1374 | 346 |
t->satb_mark_queue().reset(); |
347 |
} |
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shared_satb_queue()->reset(); |
1374 | 349 |
} |