jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp@8b46c4d82093 (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp@8b46c4d82093 (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp

Wed, 02 Sep 2009 00:04:29 -0700

author: ysr
date: Wed, 02 Sep 2009 00:04:29 -0700
changeset 1376: 8b46c4d82093
parent 1370: 05f89f00a864
child 1428: 54b3b351d6f9
permissions: -rw-r--r--

4957990: Perm heap bloat in JVM
Summary: Treat ProfileData in MDO's as a source of weak, not strong, roots. Fixes the bug for stop-world collection -- the case of concurrent collection will be fixed separately.
Reviewed-by: jcoomes, jmasa, kvn, never

 /*
  * Copyright (c) 2007 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.
  *
  */
 /////////////////////////////////////////////////////////////////
 // Closures used by ConcurrentMarkSweepGeneration's collector
 /////////////////////////////////////////////////////////////////
 class ConcurrentMarkSweepGeneration;
 class CMSBitMap;
 class CMSMarkStack;
 class CMSCollector;
 class MarkFromRootsClosure;
 class Par_MarkFromRootsClosure;
 // Decode the oop and call do_oop on it.
 #define DO_OOP_WORK_DEFN \
   void do_oop(oop obj);                                   \
   template <class T> inline void do_oop_work(T* p) {      \
     T heap_oop = oopDesc::load_heap_oop(p);               \
     if (!oopDesc::is_null(heap_oop)) {                    \
       oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);       \
       do_oop(obj);                                        \
     }                                                     \
   }
 class MarkRefsIntoClosure: public OopsInGenClosure {
  private:
   const MemRegion _span;
   CMSBitMap*      _bitMap;
   const bool      _should_do_nmethods;
  protected:
   DO_OOP_WORK_DEFN
  public:
   MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap,
                       bool should_do_nmethods);
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   inline void do_oop_nv(oop* p)       { MarkRefsIntoClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { MarkRefsIntoClosure::do_oop_work(p); }
   bool do_header() { return true; }
   virtual const bool do_nmethods() const {
     return _should_do_nmethods;
   }
   Prefetch::style prefetch_style() {
     return Prefetch::do_read;
   }
 };
 // A variant of the above used in certain kinds of CMS
 // marking verification.
 class MarkRefsIntoVerifyClosure: public OopsInGenClosure {
  private:
   const MemRegion _span;
   CMSBitMap*      _verification_bm;
   CMSBitMap*      _cms_bm;
   const bool      _should_do_nmethods;
  protected:
   DO_OOP_WORK_DEFN
  public:
   MarkRefsIntoVerifyClosure(MemRegion span, CMSBitMap* verification_bm,
                             CMSBitMap* cms_bm, bool should_do_nmethods);
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   inline void do_oop_nv(oop* p)       { MarkRefsIntoVerifyClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { MarkRefsIntoVerifyClosure::do_oop_work(p); }
   bool do_header() { return true; }
   virtual const bool do_nmethods() const {
     return _should_do_nmethods;
   }
   Prefetch::style prefetch_style() {
     return Prefetch::do_read;
   }
 };
 // KlassRememberingOopClosure is used when marking of the permanent generation
 // is being done.  It adds fields to support revisiting of klasses
 // for class unloading.  _should_remember_klasses should be set to
 // indicate if klasses should be remembered.  Currently that is whenever
 // CMS class unloading is turned on.  The _revisit_stack is used
 // to save the klasses for later processing.
 class KlassRememberingOopClosure : public OopClosure {
  protected:
   CMSCollector* _collector;
   CMSMarkStack* _revisit_stack;
   bool const    _should_remember_klasses;
  public:
   void check_remember_klasses() const PRODUCT_RETURN;
   virtual const bool should_remember_klasses() const {
     check_remember_klasses();
     return _should_remember_klasses;
   }
   virtual void remember_klass(Klass* k);
   KlassRememberingOopClosure(CMSCollector* collector,
                              ReferenceProcessor* rp,
                              CMSMarkStack* revisit_stack);
 };
 // Similar to KlassRememberingOopClosure for use when multiple
 // GC threads will execute the closure.
 class Par_KlassRememberingOopClosure : public KlassRememberingOopClosure {
  public:
   Par_KlassRememberingOopClosure(CMSCollector* collector,
                                  ReferenceProcessor* rp,
                                  CMSMarkStack* revisit_stack):
     KlassRememberingOopClosure(collector, rp, revisit_stack) {}
   virtual void remember_klass(Klass* k);
 };
 // The non-parallel version (the parallel version appears further below).
 class PushAndMarkClosure: public KlassRememberingOopClosure {
  private:
   MemRegion     _span;
   CMSBitMap*    _bit_map;
   CMSBitMap*    _mod_union_table;
   CMSMarkStack* _mark_stack;
   bool          _concurrent_precleaning;
  protected:
   DO_OOP_WORK_DEFN
  public:
   PushAndMarkClosure(CMSCollector* collector,
                      MemRegion span,
                      ReferenceProcessor* rp,
                      CMSBitMap* bit_map,
                      CMSBitMap* mod_union_table,
                      CMSMarkStack* mark_stack,
                      CMSMarkStack* revisit_stack,
                      bool concurrent_precleaning);
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   inline void do_oop_nv(oop* p)       { PushAndMarkClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { PushAndMarkClosure::do_oop_work(p); }
   bool do_header() { return true; }
   Prefetch::style prefetch_style() {
     return Prefetch::do_read;
   }
   // In support of class unloading
   virtual const bool should_remember_mdo() const {
     return false;
     // return _should_remember_klasses;
   }
   virtual void remember_mdo(DataLayout* v);
 };
 // In the parallel case, the revisit stack, the bit map and the
 // reference processor are currently all shared. Access to
 // these shared mutable structures must use appropriate
 // synchronization (for instance, via CAS). The marking stack
 // used in the non-parallel case above is here replaced with
 // an OopTaskQueue structure to allow efficient work stealing.
 class Par_PushAndMarkClosure: public Par_KlassRememberingOopClosure {
  private:
   MemRegion     _span;
   CMSBitMap*    _bit_map;
   OopTaskQueue* _work_queue;
  protected:
   DO_OOP_WORK_DEFN
  public:
   Par_PushAndMarkClosure(CMSCollector* collector,
                          MemRegion span,
                          ReferenceProcessor* rp,
                          CMSBitMap* bit_map,
                          OopTaskQueue* work_queue,
                          CMSMarkStack* revisit_stack);
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   inline void do_oop_nv(oop* p)       { Par_PushAndMarkClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { Par_PushAndMarkClosure::do_oop_work(p); }
   bool do_header() { return true; }
   Prefetch::style prefetch_style() {
     return Prefetch::do_read;
   }
   // In support of class unloading
   virtual const bool should_remember_mdo() const {
     return false;
     // return _should_remember_klasses;
   }
   virtual void remember_mdo(DataLayout* v);
 };
 // The non-parallel version (the parallel version appears further below).
 class MarkRefsIntoAndScanClosure: public OopsInGenClosure {
  private:
   MemRegion          _span;
   CMSBitMap*         _bit_map;
   CMSMarkStack*      _mark_stack;
   PushAndMarkClosure _pushAndMarkClosure;
   CMSCollector*      _collector;
   Mutex*             _freelistLock;
   bool               _yield;
   // Whether closure is being used for concurrent precleaning
   bool               _concurrent_precleaning;
  protected:
   DO_OOP_WORK_DEFN
  public:
   MarkRefsIntoAndScanClosure(MemRegion span,
                              ReferenceProcessor* rp,
                              CMSBitMap* bit_map,
                              CMSBitMap* mod_union_table,
                              CMSMarkStack* mark_stack,
                              CMSMarkStack* revisit_stack,
                              CMSCollector* collector,
                              bool should_yield,
                              bool concurrent_precleaning);
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   inline void do_oop_nv(oop* p)       { MarkRefsIntoAndScanClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); }
   bool do_header() { return true; }
   virtual const bool do_nmethods() const { return true; }
   Prefetch::style prefetch_style() {
     return Prefetch::do_read;
   }
   void set_freelistLock(Mutex* m) {
     _freelistLock = m;
   }
   virtual const bool should_remember_klasses() const {
     return _pushAndMarkClosure.should_remember_klasses();
   }
   virtual void remember_klass(Klass* k) {
     _pushAndMarkClosure.remember_klass(k);
   }
  private:
   inline void do_yield_check();
   void do_yield_work();
   bool take_from_overflow_list();
 };
 // Tn this, the parallel avatar of MarkRefsIntoAndScanClosure, the revisit
 // stack and the bitMap are shared, so access needs to be suitably
 // sycnhronized. An OopTaskQueue structure, supporting efficient
 // workstealing, replaces a CMSMarkStack for storing grey objects.
 class Par_MarkRefsIntoAndScanClosure: public OopsInGenClosure {
  private:
   MemRegion              _span;
   CMSBitMap*             _bit_map;
   OopTaskQueue*          _work_queue;
   const uint             _low_water_mark;
   Par_PushAndMarkClosure _par_pushAndMarkClosure;
  protected:
   DO_OOP_WORK_DEFN
  public:
   Par_MarkRefsIntoAndScanClosure(CMSCollector* collector,
                                  MemRegion span,
                                  ReferenceProcessor* rp,
                                  CMSBitMap* bit_map,
                                  OopTaskQueue* work_queue,
                                  CMSMarkStack*  revisit_stack);
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   inline void do_oop_nv(oop* p)       { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); }
   bool do_header() { return true; }
   virtual const bool do_nmethods() const { return true; }
   // When ScanMarkedObjectsAgainClosure is used,
   // it passes [Par_]MarkRefsIntoAndScanClosure to oop_oop_iterate(),
   // and this delegation is used.
   virtual const bool should_remember_klasses() const {
     return _par_pushAndMarkClosure.should_remember_klasses();
   }
   // See comment on should_remember_klasses() above.
   virtual void remember_klass(Klass* k) {
     _par_pushAndMarkClosure.remember_klass(k);
   }
   Prefetch::style prefetch_style() {
     return Prefetch::do_read;
   }
   void trim_queue(uint size);
 };
 // This closure is used during the concurrent marking phase
 // following the first checkpoint. Its use is buried in
 // the closure MarkFromRootsClosure.
 class PushOrMarkClosure: public KlassRememberingOopClosure {
  private:
   MemRegion       _span;
   CMSBitMap*      _bitMap;
   CMSMarkStack*   _markStack;
   HeapWord* const _finger;
   MarkFromRootsClosure* const
                   _parent;
  protected:
   DO_OOP_WORK_DEFN
  public:
   PushOrMarkClosure(CMSCollector* cms_collector,
                     MemRegion span,
                     CMSBitMap* bitMap,
                     CMSMarkStack* markStack,
                     CMSMarkStack* revisitStack,
                     HeapWord* finger,
                     MarkFromRootsClosure* parent);
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   inline void do_oop_nv(oop* p)       { PushOrMarkClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { PushOrMarkClosure::do_oop_work(p); }
   // In support of class unloading
   virtual const bool should_remember_mdo() const {
     return false;
     // return _should_remember_klasses;
   }
   virtual void remember_mdo(DataLayout* v);
   // Deal with a stack overflow condition
   void handle_stack_overflow(HeapWord* lost);
  private:
   inline void do_yield_check();
 };
 // A parallel (MT) version of the above.
 // This closure is used during the concurrent marking phase
 // following the first checkpoint. Its use is buried in
 // the closure Par_MarkFromRootsClosure.
 class Par_PushOrMarkClosure: public Par_KlassRememberingOopClosure {
  private:
   MemRegion        _whole_span;
   MemRegion        _span;        // local chunk
   CMSBitMap*       _bit_map;
   OopTaskQueue*    _work_queue;
   CMSMarkStack*    _overflow_stack;
   HeapWord*  const _finger;
   HeapWord** const _global_finger_addr;
   Par_MarkFromRootsClosure* const
                    _parent;
  protected:
   DO_OOP_WORK_DEFN
  public:
   Par_PushOrMarkClosure(CMSCollector* cms_collector,
                         MemRegion span,
                         CMSBitMap* bit_map,
                         OopTaskQueue* work_queue,
                         CMSMarkStack* mark_stack,
                         CMSMarkStack* revisit_stack,
                         HeapWord* finger,
                         HeapWord** global_finger_addr,
                         Par_MarkFromRootsClosure* parent);
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   inline void do_oop_nv(oop* p)       { Par_PushOrMarkClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { Par_PushOrMarkClosure::do_oop_work(p); }
   // In support of class unloading
   virtual const bool should_remember_mdo() const {
     return false;
     // return _should_remember_klasses;
   }
   virtual void remember_mdo(DataLayout* v);
   // Deal with a stack overflow condition
   void handle_stack_overflow(HeapWord* lost);
  private:
   inline void do_yield_check();
 };
 // For objects in CMS generation, this closure marks
 // given objects (transitively) as being reachable/live.
 // This is currently used during the (weak) reference object
 // processing phase of the CMS final checkpoint step, as
 // well as during the concurrent precleaning of the discovered
 // reference lists.
 class CMSKeepAliveClosure: public KlassRememberingOopClosure {
  private:
   const MemRegion _span;
   CMSMarkStack* _mark_stack;
   CMSBitMap*    _bit_map;
   bool          _concurrent_precleaning;
  protected:
   DO_OOP_WORK_DEFN
  public:
   CMSKeepAliveClosure(CMSCollector* collector, MemRegion span,
                       CMSBitMap* bit_map, CMSMarkStack* mark_stack,
                       CMSMarkStack* revisit_stack, bool cpc);
   bool    concurrent_precleaning() const { return _concurrent_precleaning; }
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   inline void do_oop_nv(oop* p)       { CMSKeepAliveClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { CMSKeepAliveClosure::do_oop_work(p); }
 };
 class CMSInnerParMarkAndPushClosure: public Par_KlassRememberingOopClosure {
  private:
   MemRegion     _span;
   OopTaskQueue* _work_queue;
   CMSBitMap*    _bit_map;
  protected:
   DO_OOP_WORK_DEFN
  public:
   CMSInnerParMarkAndPushClosure(CMSCollector* collector,
                                 MemRegion span, CMSBitMap* bit_map,
                                 CMSMarkStack* revisit_stack,
                                 OopTaskQueue* work_queue);
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   inline void do_oop_nv(oop* p)       { CMSInnerParMarkAndPushClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); }
 };
 // A parallel (MT) version of the above, used when
 // reference processing is parallel; the only difference
 // is in the do_oop method.
 class CMSParKeepAliveClosure: public Par_KlassRememberingOopClosure {
  private:
   MemRegion     _span;
   OopTaskQueue* _work_queue;
   CMSBitMap*    _bit_map;
   CMSInnerParMarkAndPushClosure
                 _mark_and_push;
   const uint    _low_water_mark;
   void trim_queue(uint max);
  protected:
   DO_OOP_WORK_DEFN
  public:
   CMSParKeepAliveClosure(CMSCollector* collector, MemRegion span,
                          CMSBitMap* bit_map, CMSMarkStack* revisit_stack,
                          OopTaskQueue* work_queue);
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   inline void do_oop_nv(oop* p)       { CMSParKeepAliveClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { CMSParKeepAliveClosure::do_oop_work(p); }
 };

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp@8b46c4d82093 (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp