author | jwilhelm |
Thu, 03 Oct 2013 21:36:29 +0200 | |
changeset 20398 | b206c580c45f |
parent 13728 | 882756847a04 |
child 22497 | b2e1896e9616 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2012, 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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#include "precompiled.hpp" |
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#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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#include "gc_implementation/g1/satbQueue.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "memory/sharedHeap.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "runtime/thread.hpp" |
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#include "runtime/vmThread.hpp" |
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void ObjPtrQueue::flush() { |
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// The buffer might contain refs into the CSet. We have to filter it |
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// first before we flush it, otherwise we might end up with an |
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// enqueued buffer with refs into the CSet which breaks our invariants. |
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filter(); |
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PtrQueue::flush(); |
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} |
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// This method removes entries from an SATB buffer that will not be |
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// useful to the concurrent marking threads. An entry is removed if it |
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// satisfies one of the following conditions: |
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// |
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// * it points to an object outside the G1 heap (G1's concurrent |
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// marking only visits objects inside the G1 heap), |
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// * it points to an object that has been allocated since marking |
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// started (according to SATB those objects do not need to be |
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// visited during marking), or |
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// * it points to an object that has already been marked (no need to |
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// process it again). |
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// |
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// The rest of the entries will be retained and are compacted towards |
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// the top of the buffer. Note that, because we do not allow old |
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// regions in the CSet during marking, all objects on the CSet regions |
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// are young (eden or survivors) and therefore implicitly live. So any |
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// references into the CSet will be removed during filtering. |
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void ObjPtrQueue::filter() { |
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G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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void** buf = _buf; |
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size_t sz = _sz; |
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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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// Used for sanity checking at the end of the loop. |
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debug_only(size_t entries = 0; size_t retained = 0;) |
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size_t i = sz; |
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size_t new_index = sz; |
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while (i > _index) { |
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assert(i > 0, "we should have at least one more entry to process"); |
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i -= oopSize; |
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debug_only(entries += 1;) |
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oop* p = (oop*) &buf[byte_index_to_index((int) i)]; |
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oop obj = *p; |
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// NULL the entry so that unused parts of the buffer contain NULLs |
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// at the end. If we are going to retain it we will copy it to its |
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// final place. If we have retained all entries we have visited so |
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// far, we'll just end up copying it to the same place. |
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*p = NULL; |
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bool retain = g1h->is_obj_ill(obj); |
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if (retain) { |
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assert(new_index > 0, "we should not have already filled up the buffer"); |
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new_index -= oopSize; |
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assert(new_index >= i, |
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"new_index should never be below i, as we alwaysr compact 'up'"); |
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oop* new_p = (oop*) &buf[byte_index_to_index((int) new_index)]; |
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assert(new_p >= p, "the destination location should never be below " |
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"the source as we always compact 'up'"); |
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assert(*new_p == NULL, |
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"we should have already cleared the destination location"); |
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*new_p = obj; |
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debug_only(retained += 1;) |
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} |
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} |
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#ifdef ASSERT |
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size_t entries_calc = (sz - _index) / oopSize; |
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assert(entries == entries_calc, "the number of entries we counted " |
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"should match the number of entries we calculated"); |
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size_t retained_calc = (sz - new_index) / oopSize; |
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assert(retained == retained_calc, "the number of retained entries we counted " |
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"should match the number of retained entries we calculated"); |
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#endif // ASSERT |
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_index = new_index; |
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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 ObjPtrQueue::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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// Even if G1SATBBufferEnqueueingThresholdPercent == 0 we have to |
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// filter the buffer given that this will remove any references into |
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// the CSet as we currently assume that no such refs will appear in |
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// enqueued buffers. |
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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 sz = _sz; |
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size_t all_entries = sz / oopSize; |
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size_t retained_entries = (sz - _index) / oopSize; |
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size_t perc = retained_entries * 100 / all_entries; |
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bool should_enqueue = perc > (size_t) G1SATBBufferEnqueueingThresholdPercent; |
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return should_enqueue; |
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} |
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void ObjPtrQueue::apply_closure(ObjectClosure* cl) { |
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if (_buf != NULL) { |
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apply_closure_to_buffer(cl, _buf, _index, _sz); |
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} |
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} |
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void ObjPtrQueue::apply_closure_and_empty(ObjectClosure* cl) { |
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if (_buf != NULL) { |
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apply_closure_to_buffer(cl, _buf, _index, _sz); |
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_index = _sz; |
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} |
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} |
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void ObjPtrQueue::apply_closure_to_buffer(ObjectClosure* cl, |
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void** buf, size_t index, size_t sz) { |
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if (cl == NULL) return; |
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for (size_t i = index; i < sz; i += oopSize) { |
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oop obj = (oop)buf[byte_index_to_index((int)i)]; |
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// There can be NULL entries because of destructors. |
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if (obj != NULL) { |
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cl->do_object(obj); |
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} |
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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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void ObjPtrQueue::print(const char* name) { |
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print(name, _buf, _index, _sz); |
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} |
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void ObjPtrQueue::print(const char* name, |
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void** buf, size_t index, size_t sz) { |
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gclog_or_tty->print_cr(" SATB BUFFER [%s] buf: "PTR_FORMAT" " |
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"index: "SIZE_FORMAT" sz: "SIZE_FORMAT, |
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name, buf, index, sz); |
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} |
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#endif // PRODUCT |
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#ifdef ASSERT |
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void ObjPtrQueue::verify_oops_in_buffer() { |
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if (_buf == NULL) return; |
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for (size_t i = _index; i < _sz; i += oopSize) { |
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oop obj = (oop)_buf[byte_index_to_index((int)i)]; |
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assert(obj != NULL && obj->is_oop(true /* ignore mark word */), |
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"Not an oop"); |
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} |
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} |
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#endif |
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#ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
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#pragma warning( disable:4355 ) // 'this' : used in base member initializer list |
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#endif // _MSC_VER |
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SATBMarkQueueSet::SATBMarkQueueSet() : |
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PtrQueueSet(), _closure(NULL), _par_closures(NULL), |
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_shared_satb_queue(this, true /*perm*/) { } |
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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); |
211 |
if (ParallelGCThreads > 0) { |
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_par_closures = NEW_C_HEAP_ARRAY(ObjectClosure*, ParallelGCThreads, mtGC); |
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} |
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} |
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void SATBMarkQueueSet::handle_zero_index_for_thread(JavaThread* t) { |
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DEBUG_ONLY(t->satb_mark_queue().verify_oops_in_buffer();) |
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t->satb_mark_queue().handle_zero_index(); |
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} |
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#ifdef ASSERT |
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void SATBMarkQueueSet::dump_active_values(JavaThread* first, |
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bool expected_active) { |
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gclog_or_tty->print_cr("SATB queue active values for Java Threads"); |
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gclog_or_tty->print_cr(" SATB queue set: active is %s", |
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(is_active()) ? "TRUE" : "FALSE"); |
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gclog_or_tty->print_cr(" expected_active is %s", |
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(expected_active) ? "TRUE" : "FALSE"); |
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for (JavaThread* t = first; t; t = t->next()) { |
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bool active = t->satb_mark_queue().is_active(); |
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gclog_or_tty->print_cr(" thread %s, active is %s", |
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t->name(), (active) ? "TRUE" : "FALSE"); |
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} |
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} |
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#endif // ASSERT |
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|
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void SATBMarkQueueSet::set_active_all_threads(bool b, |
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bool expected_active) { |
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assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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JavaThread* first = Threads::first(); |
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|
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#ifdef ASSERT |
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if (_all_active != expected_active) { |
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dump_active_values(first, expected_active); |
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|
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// I leave this here as a guarantee, instead of an assert, so |
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// that it will still be compiled in if we choose to uncomment |
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// the #ifdef ASSERT in a product build. The whole block is |
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// within an #ifdef ASSERT so the guarantee will not be compiled |
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// in a product build anyway. |
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guarantee(false, |
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"SATB queue set has an unexpected active value"); |
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} |
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#endif // ASSERT |
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_all_active = b; |
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|
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for (JavaThread* t = first; t; t = t->next()) { |
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#ifdef ASSERT |
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bool active = t->satb_mark_queue().is_active(); |
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if (active != expected_active) { |
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dump_active_values(first, expected_active); |
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|
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// I leave this here as a guarantee, instead of an assert, so |
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// that it will still be compiled in if we choose to uncomment |
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// the #ifdef ASSERT in a product build. The whole block is |
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// within an #ifdef ASSERT so the guarantee will not be compiled |
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// in a product build anyway. |
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guarantee(false, |
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"thread has an unexpected active value in its SATB queue"); |
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} |
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#endif // ASSERT |
1374 | 272 |
t->satb_mark_queue().set_active(b); |
273 |
} |
|
274 |
} |
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275 |
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void SATBMarkQueueSet::filter_thread_buffers() { |
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for(JavaThread* t = Threads::first(); t; t = t->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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void SATBMarkQueueSet::set_closure(ObjectClosure* closure) { |
284 |
_closure = closure; |
|
285 |
} |
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286 |
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287 |
void SATBMarkQueueSet::set_par_closure(int i, ObjectClosure* par_closure) { |
|
288 |
assert(ParallelGCThreads > 0 && _par_closures != NULL, "Precondition"); |
|
289 |
_par_closures[i] = par_closure; |
|
290 |
} |
|
291 |
||
292 |
void SATBMarkQueueSet::iterate_closure_all_threads() { |
|
293 |
for(JavaThread* t = Threads::first(); t; t = t->next()) { |
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t->satb_mark_queue().apply_closure_and_empty(_closure); |
1374 | 295 |
} |
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shared_satb_queue()->apply_closure_and_empty(_closure); |
1374 | 297 |
} |
298 |
||
299 |
void SATBMarkQueueSet::par_iterate_closure_all_threads(int worker) { |
|
300 |
SharedHeap* sh = SharedHeap::heap(); |
|
301 |
int parity = sh->strong_roots_parity(); |
|
302 |
||
303 |
for(JavaThread* t = Threads::first(); t; t = t->next()) { |
|
304 |
if (t->claim_oops_do(true, parity)) { |
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t->satb_mark_queue().apply_closure_and_empty(_par_closures[worker]); |
1374 | 306 |
} |
307 |
} |
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308 |
|
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// We also need to claim the VMThread so that its parity is updated |
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// otherwise the next call to Thread::possibly_parallel_oops_do inside |
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// a StrongRootsScope might skip the VMThread because it has a stale |
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// parity that matches the parity set by the StrongRootsScope |
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// |
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// Whichever worker succeeds in claiming the VMThread gets to do |
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// the shared queue. |
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|
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VMThread* vmt = VMThread::vm_thread(); |
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if (vmt->claim_oops_do(true, parity)) { |
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shared_satb_queue()->apply_closure_and_empty(_par_closures[worker]); |
1374 | 320 |
} |
321 |
} |
|
322 |
||
323 |
bool SATBMarkQueueSet::apply_closure_to_completed_buffer_work(bool par, |
|
324 |
int worker) { |
|
4481 | 325 |
BufferNode* nd = NULL; |
1374 | 326 |
{ |
327 |
MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
|
328 |
if (_completed_buffers_head != NULL) { |
|
329 |
nd = _completed_buffers_head; |
|
4481 | 330 |
_completed_buffers_head = nd->next(); |
1374 | 331 |
if (_completed_buffers_head == NULL) _completed_buffers_tail = NULL; |
332 |
_n_completed_buffers--; |
|
333 |
if (_n_completed_buffers == 0) _process_completed = false; |
|
334 |
} |
|
335 |
} |
|
336 |
ObjectClosure* cl = (par ? _par_closures[worker] : _closure); |
|
337 |
if (nd != NULL) { |
|
4481 | 338 |
void **buf = BufferNode::make_buffer_from_node(nd); |
339 |
ObjPtrQueue::apply_closure_to_buffer(cl, buf, 0, _sz); |
|
340 |
deallocate_buffer(buf); |
|
1374 | 341 |
return true; |
342 |
} else { |
|
343 |
return false; |
|
344 |
} |
|
345 |
} |
|
346 |
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void SATBMarkQueueSet::iterate_completed_buffers_read_only(ObjectClosure* cl) { |
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assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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assert(cl != NULL, "pre-condition"); |
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|
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BufferNode* nd = _completed_buffers_head; |
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while (nd != NULL) { |
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void** buf = BufferNode::make_buffer_from_node(nd); |
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ObjPtrQueue::apply_closure_to_buffer(cl, buf, 0, _sz); |
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nd = nd->next(); |
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} |
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} |
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|
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void SATBMarkQueueSet::iterate_thread_buffers_read_only(ObjectClosure* cl) { |
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assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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assert(cl != NULL, "pre-condition"); |
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|
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for (JavaThread* t = Threads::first(); t; t = t->next()) { |
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t->satb_mark_queue().apply_closure(cl); |
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} |
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shared_satb_queue()->apply_closure(cl); |
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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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371 |
|
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#define SATB_PRINTER_BUFFER_SIZE 256 |
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373 |
|
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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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|
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gclog_or_tty->cr(); |
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gclog_or_tty->print_cr("SATB BUFFERS [%s]", msg); |
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380 |
|
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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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ObjPtrQueue::print(buffer, buf, 0, _sz); |
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nd = nd->next(); |
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i += 1; |
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389 |
} |
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390 |
|
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391 |
for (JavaThread* t = Threads::first(); t; t = t->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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} |
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395 |
|
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shared_satb_queue()->print("Shared"); |
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397 |
|
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gclog_or_tty->cr(); |
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} |
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#endif // PRODUCT |
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|
1374 | 402 |
void SATBMarkQueueSet::abandon_partial_marking() { |
4481 | 403 |
BufferNode* buffers_to_delete = NULL; |
1374 | 404 |
{ |
405 |
MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
|
406 |
while (_completed_buffers_head != NULL) { |
|
4481 | 407 |
BufferNode* nd = _completed_buffers_head; |
408 |
_completed_buffers_head = nd->next(); |
|
409 |
nd->set_next(buffers_to_delete); |
|
1374 | 410 |
buffers_to_delete = nd; |
411 |
} |
|
412 |
_completed_buffers_tail = NULL; |
|
413 |
_n_completed_buffers = 0; |
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DEBUG_ONLY(assert_completed_buffer_list_len_correct_locked()); |
1374 | 415 |
} |
416 |
while (buffers_to_delete != NULL) { |
|
4481 | 417 |
BufferNode* nd = buffers_to_delete; |
418 |
buffers_to_delete = nd->next(); |
|
419 |
deallocate_buffer(BufferNode::make_buffer_from_node(nd)); |
|
1374 | 420 |
} |
421 |
assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
|
422 |
// So we can safely manipulate these queues. |
|
423 |
for (JavaThread* t = Threads::first(); t; t = t->next()) { |
|
424 |
t->satb_mark_queue().reset(); |
|
425 |
} |
|
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shared_satb_queue()->reset(); |
1374 | 427 |
} |