jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/collectionSetChooser.hpp@1316cec51b4d (annotated)

src/share/vm/gc_implementation/g1/collectionSetChooser.hpp@1316cec51b4d (annotated)

src/share/vm/gc_implementation/g1/collectionSetChooser.hpp

Thu, 22 Apr 2010 10:02:38 -0700

author: johnc
date: Thu, 22 Apr 2010 10:02:38 -0700
changeset 1829: 1316cec51b4d
parent 1014: 0fbdb4381b99
child 1907: c18cbe5936b8
permissions: -rw-r--r--

6819061: G1: eliminate serial Other times that are proportional to the collection set length
6871109: G1: remove the concept of the scan only prefix
Summary: Removed scan only regions and associated code. The young portion of the collection set is now constructed incrementally - when a young region is retired as the current allocation region it is added to the collection set.
Reviewed-by: apetrusenko, iveresov, tonyp

 /*
  * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 // We need to sort heap regions by collection desirability.
 class CSetChooserCache VALUE_OBJ_CLASS_SPEC {
 private:
   enum {
     CacheLength = 16
   } PrivateConstants;
   HeapRegion*  _cache[CacheLength];
   int          _occupancy; // number of region in cache
   int          _first; // "first" region in the cache
   // adding CacheLength to deal with negative values
   inline int trim_index(int index) {
     return (index + CacheLength) % CacheLength;
   }
   inline int get_sort_index(int index) {
     return -index-2;
   }
   inline int get_index(int sort_index) {
     return -sort_index-2;
   }
 public:
   CSetChooserCache(void);
   inline int occupancy(void) { return _occupancy; }
   inline bool is_full()      { return _occupancy == CacheLength; }
   inline bool is_empty()     { return _occupancy == 0; }
   void clear(void);
   void insert(HeapRegion *hr);
   HeapRegion *remove_first(void);
   void remove (HeapRegion *hr);
   inline HeapRegion *get_first(void) {
     return _cache[_first];
   }
 #ifndef PRODUCT
   bool verify (void);
   bool region_in_cache(HeapRegion *hr) {
     int sort_index = hr->sort_index();
     if (sort_index < -1) {
       int index = get_index(sort_index);
       guarantee(index < CacheLength, "should be within bounds");
       return _cache[index] == hr;
     } else
       return 0;
   }
 #endif // PRODUCT
 };
 class CollectionSetChooser: public CHeapObj {
   GrowableArray<HeapRegion*> _markedRegions;
   int _curMarkedIndex;
   int _numMarkedRegions;
   CSetChooserCache _cache;
   // True iff last collection pause ran of out new "age 0" regions, and
   // returned an "age 1" region.
   bool _unmarked_age_1_returned_as_new;
   jint _first_par_unreserved_idx;
 public:
   HeapRegion* getNextMarkedRegion(double time_so_far, double avg_prediction);
   CollectionSetChooser();
   void printSortedHeapRegions();
   void sortMarkedHeapRegions();
   void fillCache();
   bool addRegionToCache(void);
   void addMarkedHeapRegion(HeapRegion *hr);
   // Must be called before calls to getParMarkedHeapRegionChunk.
   // "n_regions" is the number of regions, "chunkSize" the chunk size.
   void prepareForAddMarkedHeapRegionsPar(size_t n_regions, size_t chunkSize);
   // Returns the first index in a contiguous chunk of "n_regions" indexes
   // that the calling thread has reserved.  These must be set by the
   // calling thread using "setMarkedHeapRegion" (to NULL if necessary).
   jint getParMarkedHeapRegionChunk(jint n_regions);
   // Set the marked array entry at index to hr.  Careful to claim the index
   // first if in parallel.
   void setMarkedHeapRegion(jint index, HeapRegion* hr);
   // Atomically increment the number of claimed regions by "inc_by".
   void incNumMarkedHeapRegions(jint inc_by);
   void clearMarkedHeapRegions();
   void updateAfterFullCollection();
   // Ensure that "hr" is not a member of the marked region array or the cache
   void removeRegion(HeapRegion* hr);
   bool unmarked_age_1_returned_as_new() { return _unmarked_age_1_returned_as_new; }
   // Returns true if the used portion of "_markedRegions" is properly
   // sorted, otherwise asserts false.
 #ifndef PRODUCT
   bool verify(void);
   bool regionProperlyOrdered(HeapRegion* r) {
     int si = r->sort_index();
     return (si == -1) ||
       (si > -1 && _markedRegions.at(si) == r) ||
       (si < -1 && _cache.region_in_cache(r));
   }
 #endif
 };

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src/share/vm/gc_implementation/g1/collectionSetChooser.hpp@1316cec51b4d (annotated)

src/share/vm/gc_implementation/g1/collectionSetChooser.hpp