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 "classfile/javaClasses.hpp"
27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
28 #include "gc_implementation/g1/g1GCPhaseTimes.hpp"
29 #include "gc_implementation/g1/g1StringDedup.hpp"
30 #include "gc_implementation/g1/g1StringDedupQueue.hpp"
31 #include "gc_implementation/g1/g1StringDedupStat.hpp"
32 #include "gc_implementation/g1/g1StringDedupTable.hpp"
33 #include "gc_implementation/g1/g1StringDedupThread.hpp"
34
35 bool G1StringDedup::_enabled = false;
36
37 void G1StringDedup::initialize() {
38 assert(UseG1GC, "String deduplication only available with G1");
39 if (UseStringDeduplication) {
40 _enabled = true;
41 G1StringDedupQueue::create();
42 G1StringDedupTable::create();
43 G1StringDedupThread::create();
44 }
45 }
46
47 void G1StringDedup::stop() {
48 assert(is_enabled(), "String deduplication not enabled");
49 G1StringDedupThread::stop();
50 }
51
52 bool G1StringDedup::is_candidate_from_mark(oop obj) {
53 if (java_lang_String::is_instance(obj)) {
194 _next_queue(0),
195 _next_bucket(0) {
196 if (allow_resize_and_rehash) {
197 // If both resize and rehash is needed, only do resize. Rehash of
198 // the table will eventually happen if the situation persists.
199 _resized_table = G1StringDedupTable::prepare_resize();
200 if (!is_resizing()) {
201 _rehashed_table = G1StringDedupTable::prepare_rehash();
202 }
203 }
204 }
205
206 G1StringDedupUnlinkOrOopsDoClosure::~G1StringDedupUnlinkOrOopsDoClosure() {
207 assert(!is_resizing() || !is_rehashing(), "Can not both resize and rehash");
208 if (is_resizing()) {
209 G1StringDedupTable::finish_resize(_resized_table);
210 } else if (is_rehashing()) {
211 G1StringDedupTable::finish_rehash(_rehashed_table);
212 }
213 }
|
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 "classfile/javaClasses.hpp"
27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
28 #include "gc_implementation/g1/g1GCPhaseTimes.hpp"
29 #include "gc_implementation/g1/g1StringDedup.hpp"
30 #include "gc_implementation/g1/g1StringDedupQueue.hpp"
31 #include "gc_implementation/g1/g1StringDedupStat.hpp"
32 #include "gc_implementation/g1/g1StringDedupTable.hpp"
33 #include "gc_implementation/g1/g1StringDedupThread.hpp"
34 #include "runtime/atomic.inline.hpp"
35
36 bool G1StringDedup::_enabled = false;
37
38 void G1StringDedup::initialize() {
39 assert(UseG1GC, "String deduplication only available with G1");
40 if (UseStringDeduplication) {
41 _enabled = true;
42 G1StringDedupQueue::create();
43 G1StringDedupTable::create();
44 G1StringDedupThread::create();
45 }
46 }
47
48 void G1StringDedup::stop() {
49 assert(is_enabled(), "String deduplication not enabled");
50 G1StringDedupThread::stop();
51 }
52
53 bool G1StringDedup::is_candidate_from_mark(oop obj) {
54 if (java_lang_String::is_instance(obj)) {
195 _next_queue(0),
196 _next_bucket(0) {
197 if (allow_resize_and_rehash) {
198 // If both resize and rehash is needed, only do resize. Rehash of
199 // the table will eventually happen if the situation persists.
200 _resized_table = G1StringDedupTable::prepare_resize();
201 if (!is_resizing()) {
202 _rehashed_table = G1StringDedupTable::prepare_rehash();
203 }
204 }
205 }
206
207 G1StringDedupUnlinkOrOopsDoClosure::~G1StringDedupUnlinkOrOopsDoClosure() {
208 assert(!is_resizing() || !is_rehashing(), "Can not both resize and rehash");
209 if (is_resizing()) {
210 G1StringDedupTable::finish_resize(_resized_table);
211 } else if (is_rehashing()) {
212 G1StringDedupTable::finish_rehash(_rehashed_table);
213 }
214 }
215
216 // Atomically claims the next available queue for exclusive access by
217 // the current thread. Returns the queue number of the claimed queue.
218 size_t G1StringDedupUnlinkOrOopsDoClosure::claim_queue() {
219 return (size_t)Atomic::add_ptr(1, &_next_queue) - 1;
220 }
221
222 // Atomically claims the next available table partition for exclusive
223 // access by the current thread. Returns the table bucket number where
224 // the claimed partition starts.
225 size_t G1StringDedupUnlinkOrOopsDoClosure::claim_table_partition(size_t partition_size) {
226 return (size_t)Atomic::add_ptr(partition_size, &_next_bucket) - partition_size;
227 }
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