author | brutisso |
Thu, 07 Aug 2014 09:35:08 +0200 | |
changeset 25909 | 571781915421 |
parent 25351 | 7c198a690050 |
child 26160 | aba6b01cb988 |
permissions | -rw-r--r-- |
17327 | 1 |
/* |
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* Copyright (c) 2013, 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/dirtyCardQueue.hpp" |
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#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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#include "gc_implementation/g1/g1HotCardCache.hpp" |
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#include "gc_implementation/g1/g1RemSet.hpp" |
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#include "gc_implementation/g1/heapRegion.hpp" |
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7c198a690050
8044775: Improve usage of umbrella header atomic.inline.hpp.
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#include "runtime/atomic.inline.hpp" |
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G1HotCardCache::G1HotCardCache(G1CollectedHeap *g1h): |
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_g1h(g1h), _hot_cache(NULL), _use_cache(false), _card_counts(g1h) {} |
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void G1HotCardCache::initialize() { |
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if (default_use_cache()) { |
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_use_cache = true; |
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_hot_cache_size = (1 << G1ConcRSLogCacheSize); |
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_hot_cache = NEW_C_HEAP_ARRAY(jbyte*, _hot_cache_size, mtGC); |
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_n_hot = 0; |
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_hot_cache_idx = 0; |
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// For refining the cards in the hot cache in parallel |
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uint n_workers = (ParallelGCThreads > 0 ? |
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_g1h->workers()->total_workers() : 1); |
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_hot_cache_par_chunk_size = MAX2(1, _hot_cache_size / (int)n_workers); |
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_hot_cache_par_claimed_idx = 0; |
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_card_counts.initialize(); |
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} |
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} |
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G1HotCardCache::~G1HotCardCache() { |
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if (default_use_cache()) { |
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assert(_hot_cache != NULL, "Logic"); |
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FREE_C_HEAP_ARRAY(jbyte*, _hot_cache, mtGC); |
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} |
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} |
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jbyte* G1HotCardCache::insert(jbyte* card_ptr) { |
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uint count = _card_counts.add_card_count(card_ptr); |
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if (!_card_counts.is_hot(count)) { |
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// The card is not hot so do not store it in the cache; |
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// return it for immediate refining. |
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return card_ptr; |
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} |
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// Otherwise, the card is hot. |
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jbyte* res = NULL; |
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MutexLockerEx x(HotCardCache_lock, Mutex::_no_safepoint_check_flag); |
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if (_n_hot == _hot_cache_size) { |
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res = _hot_cache[_hot_cache_idx]; |
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_n_hot--; |
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} |
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// Now _n_hot < _hot_cache_size, and we can insert at _hot_cache_idx. |
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_hot_cache[_hot_cache_idx] = card_ptr; |
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_hot_cache_idx++; |
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if (_hot_cache_idx == _hot_cache_size) { |
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// Wrap around |
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_hot_cache_idx = 0; |
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} |
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_n_hot++; |
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return res; |
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} |
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8016302: Change type of the number of GC workers to unsigned int (2)
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void G1HotCardCache::drain(uint worker_i, |
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G1RemSet* g1rs, |
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DirtyCardQueue* into_cset_dcq) { |
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if (!default_use_cache()) { |
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assert(_hot_cache == NULL, "Logic"); |
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return; |
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} |
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assert(_hot_cache != NULL, "Logic"); |
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assert(!use_cache(), "cache should be disabled"); |
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int start_idx; |
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while ((start_idx = _hot_cache_par_claimed_idx) < _n_hot) { // read once |
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int end_idx = start_idx + _hot_cache_par_chunk_size; |
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if (start_idx == |
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Atomic::cmpxchg(end_idx, &_hot_cache_par_claimed_idx, start_idx)) { |
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// The current worker has successfully claimed the chunk [start_idx..end_idx) |
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end_idx = MIN2(end_idx, _n_hot); |
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for (int i = start_idx; i < end_idx; i++) { |
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jbyte* card_ptr = _hot_cache[i]; |
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if (card_ptr != NULL) { |
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if (g1rs->refine_card(card_ptr, worker_i, true)) { |
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// The part of the heap spanned by the card contains references |
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// that point into the current collection set. |
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// We need to record the card pointer in the DirtyCardQueueSet |
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// that we use for such cards. |
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// |
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// The only time we care about recording cards that contain |
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// references that point into the collection set is during |
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// RSet updating while within an evacuation pause. |
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// In this case worker_i should be the id of a GC worker thread |
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assert(SafepointSynchronize::is_at_safepoint(), "Should be at a safepoint"); |
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8016302: Change type of the number of GC workers to unsigned int (2)
vkempik
parents:
17327
diff
changeset
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assert(worker_i < (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), |
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err_msg("incorrect worker id: %u", worker_i)); |
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into_cset_dcq->enqueue(card_ptr); |
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} |
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} |
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} |
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} |
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} |
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// The existing entries in the hot card cache, which were just refined |
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// above, are discarded prior to re-enabling the cache near the end of the GC. |
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} |
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void G1HotCardCache::resize_card_counts(size_t heap_capacity) { |
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_card_counts.resize(heap_capacity); |
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} |
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void G1HotCardCache::reset_card_counts(HeapRegion* hr) { |
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_card_counts.clear_region(hr); |
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} |
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void G1HotCardCache::reset_card_counts() { |
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_card_counts.clear_all(); |
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} |