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src/share/vm/gc_implementation/shared/vmGCOperations.hpp

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rev 7780 : imported patch 8072621
rev 7781 : imported patch 8066771
rev 7782 : [mq]: review


  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP
  27 
  28 #include "memory/heapInspection.hpp"
  29 #include "runtime/handles.hpp"
  30 #include "runtime/jniHandles.hpp"
  31 #include "runtime/synchronizer.hpp"
  32 #include "runtime/vm_operations.hpp"
  33 #include "prims/jvmtiExport.hpp"
  34 
  35 // The following class hierarchy represents
  36 // a set of operations (VM_Operation) related to GC.
  37 //
  38 //  VM_Operation
  39 //      VM_GC_Operation
  40 //          VM_GC_HeapInspection
  41 //          VM_GenCollectForAllocation
  42 //          VM_GenCollectFull
  43 //          VM_GenCollectFullConcurrent
  44 //          VM_ParallelGCFailedAllocation
  45 //          VM_ParallelGCSystemGC



  46 //  VM_GC_Operation
  47 //   - implements methods common to all classes in the hierarchy:
  48 //     prevents multiple gc requests and manages lock on heap;
  49 //
  50 //  VM_GC_HeapInspection
  51 //   - prints class histogram on SIGBREAK if PrintClassHistogram
  52 //     is specified; and also the attach "inspectheap" operation
  53 //

  54 //  VM_GenCollectForAllocation
  55 //  VM_ParallelGCFailedAllocation
  56 //   - this operation is invoked when allocation is failed;
  57 //     operation performs garbage collection and tries to
  58 //     allocate afterwards;
  59 //
  60 //  VM_GenCollectFull
  61 //  VM_GenCollectFullConcurrent
  62 //  VM_ParallelGCSystemGC
  63 //   - these operations preform full collection of heaps of
  64 //     different kind
  65 //
  66 
  67 class VM_GC_Operation: public VM_Operation {
  68  protected:
  69   BasicLock      _pending_list_basic_lock; // for refs pending list notification (PLL)
  70   uint           _gc_count_before;         // gc count before acquiring PLL
  71   uint           _full_gc_count_before;    // full gc count before acquiring PLL
  72   bool           _full;                    // whether a "full" collection
  73   bool           _prologue_succeeded;      // whether doit_prologue succeeded


 143     _full_gc = request_full_gc;
 144     _csv_format = false;
 145     _print_help = false;
 146     _print_class_stats = false;
 147     _columns = NULL;
 148   }
 149 
 150   ~VM_GC_HeapInspection() {}
 151   virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }
 152   virtual bool skip_operation() const;
 153   virtual bool doit_prologue();
 154   virtual void doit();
 155   void set_csv_format(bool value) {_csv_format = value;}
 156   void set_print_help(bool value) {_print_help = value;}
 157   void set_print_class_stats(bool value) {_print_class_stats = value;}
 158   void set_columns(const char* value) {_columns = value;}
 159  protected:
 160   bool collect();
 161 };
 162 













 163 
 164 class VM_GenCollectForAllocation: public VM_GC_Operation {
 165  private:
 166   HeapWord*   _res;
 167   size_t      _size;                       // size of object to be allocated.
 168   bool        _tlab;                       // alloc is of a tlab.
 169  public:
 170   VM_GenCollectForAllocation(size_t size,
 171                              bool tlab,
 172                              uint gc_count_before)
 173     : VM_GC_Operation(gc_count_before, GCCause::_allocation_failure),
 174       _size(size),
 175       _tlab(tlab) {
 176     _res = NULL;
 177   }
 178   ~VM_GenCollectForAllocation()  {}
 179   virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; }
 180   virtual void doit();
 181   HeapWord* result() const       { return _res; }
 182 };
 183 
 184 // VM operation to invoke a collection of the heap as a
 185 // GenCollectedHeap heap.
 186 class VM_GenCollectFull: public VM_GC_Operation {
 187  private:
 188   int _max_level;
 189  public:
 190   VM_GenCollectFull(uint gc_count_before,
 191                     uint full_gc_count_before,
 192                     GCCause::Cause gc_cause,
 193                     int max_level)
 194     : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */),
 195       _max_level(max_level) { }
 196   ~VM_GenCollectFull() {}
 197   virtual VMOp_Type type() const { return VMOp_GenCollectFull; }
 198   virtual void doit();
 199 };
 200 
 201 class VM_CollectForMetadataAllocation: public VM_GC_Operation {




  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP
  27 
  28 #include "memory/heapInspection.hpp"
  29 #include "runtime/handles.hpp"
  30 #include "runtime/jniHandles.hpp"
  31 #include "runtime/synchronizer.hpp"
  32 #include "runtime/vm_operations.hpp"
  33 #include "prims/jvmtiExport.hpp"
  34 
  35 // The following class hierarchy represents
  36 // a set of operations (VM_Operation) related to GC.
  37 //
  38 //  VM_Operation
  39 //      VM_GC_Operation
  40 //          VM_GC_HeapInspection

  41 //          VM_GenCollectFull
  42 //          VM_GenCollectFullConcurrent

  43 //          VM_ParallelGCSystemGC
  44 //          VM_CollectForAllocation
  45 //              VM_GenCollectForAllocation
  46 //              VM_ParallelGCFailedAllocation
  47 //  VM_GC_Operation
  48 //   - implements methods common to all classes in the hierarchy:
  49 //     prevents multiple gc requests and manages lock on heap;
  50 //
  51 //  VM_GC_HeapInspection
  52 //   - prints class histogram on SIGBREAK if PrintClassHistogram
  53 //     is specified; and also the attach "inspectheap" operation
  54 //
  55 //  VM_CollectForAllocation
  56 //  VM_GenCollectForAllocation
  57 //  VM_ParallelGCFailedAllocation
  58 //   - this operation is invoked when allocation is failed;
  59 //     operation performs garbage collection and tries to
  60 //     allocate afterwards;
  61 //
  62 //  VM_GenCollectFull
  63 //  VM_GenCollectFullConcurrent
  64 //  VM_ParallelGCSystemGC
  65 //   - these operations preform full collection of heaps of
  66 //     different kind
  67 //
  68 
  69 class VM_GC_Operation: public VM_Operation {
  70  protected:
  71   BasicLock      _pending_list_basic_lock; // for refs pending list notification (PLL)
  72   uint           _gc_count_before;         // gc count before acquiring PLL
  73   uint           _full_gc_count_before;    // full gc count before acquiring PLL
  74   bool           _full;                    // whether a "full" collection
  75   bool           _prologue_succeeded;      // whether doit_prologue succeeded


 145     _full_gc = request_full_gc;
 146     _csv_format = false;
 147     _print_help = false;
 148     _print_class_stats = false;
 149     _columns = NULL;
 150   }
 151 
 152   ~VM_GC_HeapInspection() {}
 153   virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }
 154   virtual bool skip_operation() const;
 155   virtual bool doit_prologue();
 156   virtual void doit();
 157   void set_csv_format(bool value) {_csv_format = value;}
 158   void set_print_help(bool value) {_print_help = value;}
 159   void set_print_class_stats(bool value) {_print_class_stats = value;}
 160   void set_columns(const char* value) {_columns = value;}
 161  protected:
 162   bool collect();
 163 };
 164 
 165 class VM_CollectForAllocation : public VM_GC_Operation {
 166  protected:
 167   size_t    _word_size; // Size of object to be allocated (in number of words)
 168   HeapWord* _result;    // Allocation result (NULL if allocation failed)
 169 
 170  public:
 171   VM_CollectForAllocation(size_t word_size, uint gc_count_before, GCCause::Cause cause)
 172     : VM_GC_Operation(gc_count_before, cause), _result(NULL), _word_size(word_size) {}
 173 
 174   HeapWord* result() const {
 175     return _result;
 176   }
 177 };
 178 
 179 class VM_GenCollectForAllocation : public VM_CollectForAllocation {
 180  private:


 181   bool        _tlab;                       // alloc is of a tlab.
 182  public:
 183   VM_GenCollectForAllocation(size_t word_size,
 184                              bool tlab,
 185                              uint gc_count_before)
 186     : VM_CollectForAllocation(word_size, gc_count_before, GCCause::_allocation_failure),

 187       _tlab(tlab) {
 188     assert(word_size != 0, "An allocation should always be requested with this operation.");
 189   }
 190   ~VM_GenCollectForAllocation()  {}
 191   virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; }
 192   virtual void doit();

 193 };
 194 
 195 // VM operation to invoke a collection of the heap as a
 196 // GenCollectedHeap heap.
 197 class VM_GenCollectFull: public VM_GC_Operation {
 198  private:
 199   int _max_level;
 200  public:
 201   VM_GenCollectFull(uint gc_count_before,
 202                     uint full_gc_count_before,
 203                     GCCause::Cause gc_cause,
 204                     int max_level)
 205     : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */),
 206       _max_level(max_level) { }
 207   ~VM_GenCollectFull() {}
 208   virtual VMOp_Type type() const { return VMOp_GenCollectFull; }
 209   virtual void doit();
 210 };
 211 
 212 class VM_CollectForMetadataAllocation: public VM_GC_Operation {


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