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

   1 /*
   2  * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  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 #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
  74   GCCause::Cause _gc_cause;                // the putative cause for this gc op
  75   bool           _gc_locked;               // will be set if gc was locked
  76 
  77   virtual bool skip_operation() const;
  78 
  79   // java.lang.ref.Reference support
  80   void acquire_pending_list_lock();
  81   void release_and_notify_pending_list_lock();
  82 
  83  public:
  84   VM_GC_Operation(uint gc_count_before,
  85                   GCCause::Cause _cause,
  86                   uint full_gc_count_before = 0,
  87                   bool full = false) {
  88     _full = full;
  89     _prologue_succeeded = false;
  90     _gc_count_before    = gc_count_before;
  91 
  92     // A subclass constructor will likely overwrite the following
  93     _gc_cause           = _cause;
  94 
  95     _gc_locked = false;
  96 
  97     _full_gc_count_before = full_gc_count_before;
  98     // In ParallelScavengeHeap::mem_allocate() collections can be
  99     // executed within a loop and _all_soft_refs_clear can be set
 100     // true after they have been cleared by a collection and another
 101     // collection started so that _all_soft_refs_clear can be true
 102     // when this collection is started.  Don't assert that
 103     // _all_soft_refs_clear have to be false here even though
 104     // mutators have run.  Soft refs will be cleared again in this
 105     // collection.
 106   }
 107   ~VM_GC_Operation() {
 108     CollectedHeap* ch = Universe::heap();
 109     ch->collector_policy()->set_all_soft_refs_clear(false);
 110   }
 111 
 112   // Acquire the reference synchronization lock
 113   virtual bool doit_prologue();
 114   // Do notifyAll (if needed) and release held lock
 115   virtual void doit_epilogue();
 116 
 117   virtual bool allow_nested_vm_operations() const  { return true; }
 118   bool prologue_succeeded() const { return _prologue_succeeded; }
 119 
 120   void set_gc_locked() { _gc_locked = true; }
 121   bool gc_locked() const  { return _gc_locked; }
 122 
 123   static void notify_gc_begin(bool full = false);
 124   static void notify_gc_end();
 125 };
 126 
 127 
 128 class VM_GC_HeapInspection: public VM_GC_Operation {
 129  private:
 130   outputStream* _out;
 131   bool _full_gc;
 132   bool _csv_format; // "comma separated values" format for spreadsheet.
 133   bool _print_help;
 134   bool _print_class_stats;
 135   const char* _columns;
 136  public:
 137   VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
 138     VM_GC_Operation(0 /* total collections,      dummy, ignored */,
 139                     GCCause::_heap_inspection /* GC Cause */,
 140                     0 /* total full collections, dummy, ignored */,
 141                     request_full_gc) {
 142     _out = out;
 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 {
 202  private:
 203   MetaWord*                _result;
 204   size_t                   _size;     // size of object to be allocated
 205   Metaspace::MetadataType  _mdtype;
 206   ClassLoaderData*         _loader_data;
 207  public:
 208   VM_CollectForMetadataAllocation(ClassLoaderData* loader_data,
 209                                   size_t size, Metaspace::MetadataType mdtype,
 210                                   uint gc_count_before,
 211                                   uint full_gc_count_before,
 212                                   GCCause::Cause gc_cause)
 213     : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true),
 214       _loader_data(loader_data), _size(size), _mdtype(mdtype), _result(NULL) {
 215   }
 216   virtual VMOp_Type type() const { return VMOp_CollectForMetadataAllocation; }
 217   virtual void doit();
 218   MetaWord* result() const       { return _result; }
 219 
 220   bool initiate_concurrent_GC();
 221 };
 222 
 223 class SvcGCMarker : public StackObj {
 224  private:
 225   JvmtiGCMarker _jgcm;
 226  public:
 227   typedef enum { MINOR, FULL, OTHER } reason_type;
 228 
 229   SvcGCMarker(reason_type reason ) {
 230     VM_GC_Operation::notify_gc_begin(reason == FULL);
 231   }
 232 
 233   ~SvcGCMarker() {
 234     VM_GC_Operation::notify_gc_end();
 235   }
 236 };
 237 
 238 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP
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