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src/hotspot/share/gc/g1/g1StringDedup.cpp

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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 #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 


  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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