Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1HotCardCache.cpp @ 23472:047a642c9729
8065579: WB method to start G1 concurrent mark cycle should be introduced
Summary: Add a WhiteBox callback to the VM to start a concurrent mark cycle in G1.
Reviewed-by: tschatzl, sjohanss
Contributed-by: Leonid Mesnik <leonid.mesnik@oracle.com>
| author | kevinw |
|---|---|
| date | Wed, 02 Dec 2015 13:58:34 +0530 |
| parents | b6a1bf5222c5 |
| children |
| rev | line source |
|---|---|
| 10246 | 1 /* |
|
22903
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
2 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved. |
| 10246 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "precompiled.hpp" | |
| 26 #include "gc_implementation/g1/dirtyCardQueue.hpp" | |
| 27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 28 #include "gc_implementation/g1/g1HotCardCache.hpp" | |
| 29 #include "gc_implementation/g1/g1RemSet.hpp" | |
| 30 #include "runtime/atomic.hpp" | |
| 31 | |
| 32 G1HotCardCache::G1HotCardCache(G1CollectedHeap *g1h): | |
| 33 _g1h(g1h), _hot_cache(NULL), _use_cache(false), _card_counts(g1h) {} | |
| 34 | |
| 20337 | 35 void G1HotCardCache::initialize(G1RegionToSpaceMapper* card_counts_storage) { |
| 10246 | 36 if (default_use_cache()) { |
| 37 _use_cache = true; | |
| 38 | |
|
22903
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
39 _hot_cache_size = (size_t)1 << G1ConcRSLogCacheSize; |
| 10246 | 40 _hot_cache = NEW_C_HEAP_ARRAY(jbyte*, _hot_cache_size, mtGC); |
| 41 | |
|
22903
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
42 reset_hot_cache_internal(); |
| 10246 | 43 |
| 44 // For refining the cards in the hot cache in parallel | |
|
22902
ae374055ebce
8053998: Hot card cache flush chunk size too coarse grained
mlarsson
parents:
20481
diff
changeset
|
45 _hot_cache_par_chunk_size = (int)(ParallelGCThreads > 0 ? ClaimChunkSize : _hot_cache_size); |
| 10246 | 46 _hot_cache_par_claimed_idx = 0; |
| 47 | |
| 20337 | 48 _card_counts.initialize(card_counts_storage); |
| 10246 | 49 } |
| 50 } | |
| 51 | |
| 52 G1HotCardCache::~G1HotCardCache() { | |
| 53 if (default_use_cache()) { | |
| 54 assert(_hot_cache != NULL, "Logic"); | |
| 55 FREE_C_HEAP_ARRAY(jbyte*, _hot_cache, mtGC); | |
| 56 } | |
| 57 } | |
| 58 | |
| 59 jbyte* G1HotCardCache::insert(jbyte* card_ptr) { | |
| 60 uint count = _card_counts.add_card_count(card_ptr); | |
| 61 if (!_card_counts.is_hot(count)) { | |
| 62 // The card is not hot so do not store it in the cache; | |
| 63 // return it for immediate refining. | |
| 64 return card_ptr; | |
| 65 } | |
| 66 // Otherwise, the card is hot. | |
|
22903
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
67 size_t index = Atomic::add_ptr((intptr_t)1, (volatile intptr_t*)&_hot_cache_idx) - 1; |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
68 size_t masked_index = index & (_hot_cache_size - 1); |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
69 jbyte* current_ptr = _hot_cache[masked_index]; |
| 10246 | 70 |
|
22903
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
71 // Try to store the new card pointer into the cache. Compare-and-swap to guard |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
72 // against the unlikely event of a race resulting in another card pointer to |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
73 // have already been written to the cache. In this case we will return |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
74 // card_ptr in favor of the other option, which would be starting over. This |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
75 // should be OK since card_ptr will likely be the older card already when/if |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
76 // this ever happens. |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
77 jbyte* previous_ptr = (jbyte*)Atomic::cmpxchg_ptr(card_ptr, |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
78 &_hot_cache[masked_index], |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
79 current_ptr); |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
80 return (previous_ptr == current_ptr) ? previous_ptr : card_ptr; |
| 10246 | 81 } |
| 82 | |
|
17844
8847586c9037
8016302: Change type of the number of GC workers to unsigned int (2)
vkempik
parents:
10246
diff
changeset
|
83 void G1HotCardCache::drain(uint worker_i, |
| 10246 | 84 G1RemSet* g1rs, |
| 85 DirtyCardQueue* into_cset_dcq) { | |
| 86 if (!default_use_cache()) { | |
| 87 assert(_hot_cache == NULL, "Logic"); | |
| 88 return; | |
| 89 } | |
| 90 | |
| 91 assert(_hot_cache != NULL, "Logic"); | |
| 92 assert(!use_cache(), "cache should be disabled"); | |
|
22903
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
93 while (_hot_cache_par_claimed_idx < _hot_cache_size) { |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
94 size_t end_idx = Atomic::add_ptr((intptr_t)_hot_cache_par_chunk_size, |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
95 (volatile intptr_t*)&_hot_cache_par_claimed_idx); |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
96 size_t start_idx = end_idx - _hot_cache_par_chunk_size; |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
97 // The current worker has successfully claimed the chunk [start_idx..end_idx) |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
98 end_idx = MIN2(end_idx, _hot_cache_size); |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
99 for (size_t i = start_idx; i < end_idx; i++) { |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
100 jbyte* card_ptr = _hot_cache[i]; |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
101 if (card_ptr != NULL) { |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
102 if (g1rs->refine_card(card_ptr, worker_i, true)) { |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
103 // The part of the heap spanned by the card contains references |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
104 // that point into the current collection set. |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
105 // We need to record the card pointer in the DirtyCardQueueSet |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
106 // that we use for such cards. |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
107 // |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
108 // The only time we care about recording cards that contain |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
109 // references that point into the collection set is during |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
110 // RSet updating while within an evacuation pause. |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
111 // In this case worker_i should be the id of a GC worker thread |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
112 assert(SafepointSynchronize::is_at_safepoint(), "Should be at a safepoint"); |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
113 assert(worker_i < ParallelGCThreads, |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
114 err_msg("incorrect worker id: %u", worker_i)); |
| 10246 | 115 |
|
22903
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
116 into_cset_dcq->enqueue(card_ptr); |
| 10246 | 117 } |
|
22903
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
118 } else { |
|
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
119 break; |
| 10246 | 120 } |
| 121 } | |
| 122 } | |
|
22903
b6a1bf5222c5
8069273: Decrease Hot Card Cache Lock contention
redestad
parents:
22902
diff
changeset
|
123 |
| 10246 | 124 // The existing entries in the hot card cache, which were just refined |
| 125 // above, are discarded prior to re-enabling the cache near the end of the GC. | |
| 126 } | |
| 127 | |
| 128 void G1HotCardCache::reset_card_counts(HeapRegion* hr) { | |
| 129 _card_counts.clear_region(hr); | |
| 130 } | |
| 131 | |
| 132 void G1HotCardCache::reset_card_counts() { | |
| 133 _card_counts.clear_all(); | |
| 134 } |