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/g1/dirtyCardQueue.hpp"
27 #include "gc/g1/g1CollectedHeap.inline.hpp"
28 #include "gc/g1/g1HotCardCache.hpp"
29 #include "runtime/atomic.inline.hpp"
30
31 G1HotCardCache::G1HotCardCache(G1CollectedHeap *g1h):
32 _g1h(g1h), _hot_cache(NULL), _use_cache(false), _card_counts(g1h) {}
33
34 void G1HotCardCache::initialize(G1RegionToSpaceMapper* card_counts_storage) {
35 if (default_use_cache()) {
36 _use_cache = true;
37
38 _hot_cache_size = (size_t)1 << G1ConcRSLogCacheSize;
39 _hot_cache = _hot_cache_memory.allocate(_hot_cache_size);
40
41 reset_hot_cache_internal();
42
43 // For refining the cards in the hot cache in parallel
44 _hot_cache_par_chunk_size = ClaimChunkSize;
45 _hot_cache_par_claimed_idx = 0;
46
47 _card_counts.initialize(card_counts_storage);
48 }
49 }
50
51 G1HotCardCache::~G1HotCardCache() {
52 if (default_use_cache()) {
53 assert(_hot_cache != NULL, "Logic");
54 _hot_cache_memory.free();
55 _hot_cache = NULL;
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.
67 size_t index = Atomic::add(1, &_hot_cache_idx) - 1;
68 size_t masked_index = index & (_hot_cache_size - 1);
69 jbyte* current_ptr = _hot_cache[masked_index];
70
71 // Try to store the new card pointer into the cache. Compare-and-swap to guard
72 // against the unlikely event of a race resulting in another card pointer to
73 // have already been written to the cache. In this case we will return
74 // card_ptr in favor of the other option, which would be starting over. This
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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/g1/dirtyCardQueue.hpp"
27 #include "gc/g1/g1CollectedHeap.inline.hpp"
28 #include "gc/g1/g1HotCardCache.hpp"
29 #include "runtime/atomic.inline.hpp"
30
31 G1HotCardCache::G1HotCardCache(G1CollectedHeap *g1h):
32 _g1h(g1h), _hot_cache(NULL), _use_cache(false), _card_counts(g1h) {}
33
34 void G1HotCardCache::initialize(G1RegionToSpaceMapper* card_counts_storage) {
35 if (default_use_cache()) {
36 _use_cache = true;
37
38 _hot_cache_size = (size_t)1 << G1ConcRSLogCacheSize;
39 _hot_cache = ArrayAllocator<jbyte*, mtGC>::allocate(_hot_cache_size);
40
41 reset_hot_cache_internal();
42
43 // For refining the cards in the hot cache in parallel
44 _hot_cache_par_chunk_size = ClaimChunkSize;
45 _hot_cache_par_claimed_idx = 0;
46
47 _card_counts.initialize(card_counts_storage);
48 }
49 }
50
51 G1HotCardCache::~G1HotCardCache() {
52 if (default_use_cache()) {
53 assert(_hot_cache != NULL, "Logic");
54 ArrayAllocator<jbyte*, mtGC>::free(_hot_cache, _hot_cache_size);
55 _hot_cache = NULL;
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.
67 size_t index = Atomic::add(1, &_hot_cache_idx) - 1;
68 size_t masked_index = index & (_hot_cache_size - 1);
69 jbyte* current_ptr = _hot_cache[masked_index];
70
71 // Try to store the new card pointer into the cache. Compare-and-swap to guard
72 // against the unlikely event of a race resulting in another card pointer to
73 // have already been written to the cache. In this case we will return
74 // card_ptr in favor of the other option, which would be starting over. This
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