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 "classfile/javaClasses.inline.hpp"
27 #include "gc/g1/g1CollectedHeap.inline.hpp"
28 #include "gc/g1/g1GCPhaseTimes.hpp"
29 #include "gc/g1/g1StringDedup.hpp"
30 #include "gc/g1/g1StringDedupQueue.hpp"
31 #include "gc/g1/g1StringDedupStat.hpp"
32 #include "gc/shared/stringdedup/stringDedup.inline.hpp"
33 #include "gc/shared/stringdedup/stringDedupQueue.hpp"
34 #include "gc/shared/stringdedup/stringDedupTable.hpp"
35 #include "gc/shared/stringdedup/stringDedupThread.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "runtime/atomic.hpp"
38
39 void G1StringDedup::initialize() {
40 assert(UseG1GC, "String deduplication available with G1");
41 StringDedup::initialize_impl<G1StringDedupQueue, G1StringDedupStat>();
42 }
43
44 bool G1StringDedup::is_candidate_from_mark(oop obj) {
45 if (java_lang_String::is_instance_inlined(obj)) {
46 bool from_young = G1CollectedHeap::heap()->heap_region_containing(obj)->is_young();
47 if (from_young && obj->age() < StringDeduplicationAgeThreshold) {
48 // Candidate found. String is being evacuated from young to old but has not
49 // reached the deduplication age threshold, i.e. has not previously been a
50 // candidate during its life in the young generation.
51 return true;
52 }
53 }
54
55 // Not a candidate
56 return false;
57 }
71 return true;
72 }
73 if (!to_young && obj->age() < StringDeduplicationAgeThreshold) {
74 // Candidate found. String is being evacuated from young to old but has not
75 // reached the deduplication age threshold, i.e. has not previously been a
76 // candidate during its life in the young generation.
77 return true;
78 }
79 }
80
81 // Not a candidate
82 return false;
83 }
84
85 void G1StringDedup::enqueue_from_evacuation(bool from_young, bool to_young, uint worker_id, oop java_string) {
86 assert(is_enabled(), "String deduplication not enabled");
87 if (is_candidate_from_evacuation(from_young, to_young, java_string)) {
88 G1StringDedupQueue::push(worker_id, java_string);
89 }
90 }
91
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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 "classfile/javaClasses.inline.hpp"
27 #include "gc/g1/g1CollectedHeap.inline.hpp"
28 #include "gc/g1/g1GCPhaseTimes.hpp"
29 #include "gc/g1/g1StringDedup.hpp"
30 #include "gc/g1/g1StringDedupQueue.hpp"
31 #include "gc/g1/g1StringDedupStat.hpp"
32 #include "gc/shared/stringdedup/stringDedup.inline.hpp"
33 #include "gc/shared/stringdedup/stringDedupQueue.hpp"
34 #include "gc/shared/stringdedup/stringDedupTable.hpp"
35 #include "gc/shared/stringdedup/stringDedupThread.inline.hpp"
36 #include "oops/oop.inline.hpp"
37
38 void G1StringDedup::initialize() {
39 assert(UseG1GC, "String deduplication available with G1");
40 StringDedup::initialize_impl<G1StringDedupQueue, G1StringDedupStat>();
41 }
42
43 bool G1StringDedup::is_candidate_from_mark(oop obj) {
44 if (java_lang_String::is_instance_inlined(obj)) {
45 bool from_young = G1CollectedHeap::heap()->heap_region_containing(obj)->is_young();
46 if (from_young && obj->age() < StringDeduplicationAgeThreshold) {
47 // Candidate found. String is being evacuated from young to old but has not
48 // reached the deduplication age threshold, i.e. has not previously been a
49 // candidate during its life in the young generation.
50 return true;
51 }
52 }
53
54 // Not a candidate
55 return false;
56 }
70 return true;
71 }
72 if (!to_young && obj->age() < StringDeduplicationAgeThreshold) {
73 // Candidate found. String is being evacuated from young to old but has not
74 // reached the deduplication age threshold, i.e. has not previously been a
75 // candidate during its life in the young generation.
76 return true;
77 }
78 }
79
80 // Not a candidate
81 return false;
82 }
83
84 void G1StringDedup::enqueue_from_evacuation(bool from_young, bool to_young, uint worker_id, oop java_string) {
85 assert(is_enabled(), "String deduplication not enabled");
86 if (is_candidate_from_evacuation(from_young, to_young, java_string)) {
87 G1StringDedupQueue::push(worker_id, java_string);
88 }
89 }
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