jdk8-mips64-public/hotspot: src/share/vm/services/memSnapshot.hpp@d2a62e0f25eb (annotated)

src/share/vm/services/memSnapshot.hpp@d2a62e0f25eb (annotated)

src/share/vm/services/memSnapshot.hpp

Thu, 28 Jun 2012 17:03:16 -0400

author: zgu
date: Thu, 28 Jun 2012 17:03:16 -0400
changeset 3900: d2a62e0f25eb
child 3986: 4acebbe310e1
permissions: -rw-r--r--

6995781: Native Memory Tracking (Phase 1)
7151532: DCmd for hotspot native memory tracking
Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd
Reviewed-by: acorn, coleenp, fparain

 /*
  * Copyright (c) 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_SERVICES_MEM_SNAPSHOT_HPP
 #define SHARE_VM_SERVICES_MEM_SNAPSHOT_HPP
 #include "memory/allocation.hpp"
 #include "runtime/mutex.hpp"
 #include "runtime/mutexLocker.hpp"
 #include "services/memBaseline.hpp"
 #include "services/memPtrArray.hpp"
 // Snapshot pointer array iterator
 // The pointer array contains malloc-ed pointers
 class MemPointerIterator : public MemPointerArrayIteratorImpl {
  public:
   MemPointerIterator(MemPointerArray* arr):
     MemPointerArrayIteratorImpl(arr) {
     assert(arr != NULL, "null array");
   }
 #ifdef ASSERT
   virtual bool is_dup_pointer(const MemPointer* ptr1,
     const MemPointer* ptr2) const {
     MemPointerRecord* p1 = (MemPointerRecord*)ptr1;
     MemPointerRecord* p2 = (MemPointerRecord*)ptr2;
     if (p1->addr() != p2->addr()) return false;
     if ((p1->flags() & MemPointerRecord::tag_masks) !=
         (p2->flags() & MemPointerRecord::tag_masks)) {
       return false;
     }
     // we do see multiple commit/uncommit on the same memory, it is ok
     return (p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_alloc ||
            (p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_release;
   }
   virtual bool insert(MemPointer* ptr) {
     if (_pos > 0) {
       MemPointer* p1 = (MemPointer*)ptr;
       MemPointer* p2 = (MemPointer*)_array->at(_pos - 1);
       assert(!is_dup_pointer(p1, p2),
         "dup pointer");
     }
      if (_pos < _array->length() -1) {
       MemPointer* p1 = (MemPointer*)ptr;
       MemPointer* p2 = (MemPointer*)_array->at(_pos + 1);
       assert(!is_dup_pointer(p1, p2),
         "dup pointer");
      }
     return _array->insert_at(ptr, _pos);
   }
   virtual bool insert_after(MemPointer* ptr) {
     if (_pos > 0) {
       MemPointer* p1 = (MemPointer*)ptr;
       MemPointer* p2 = (MemPointer*)_array->at(_pos - 1);
       assert(!is_dup_pointer(p1, p2),
         "dup pointer");
     }
     if (_pos < _array->length() - 1) {
       MemPointer* p1 = (MemPointer*)ptr;
       MemPointer* p2 = (MemPointer*)_array->at(_pos + 1);
       assert(!is_dup_pointer(p1, p2),
         "dup pointer");
      }
     if (_array->insert_at(ptr, _pos + 1)) {
       _pos ++;
       return true;
     }
     return false;
   }
 #endif
   virtual MemPointer* locate(address addr) {
     MemPointer* cur = current();
     while (cur != NULL && cur->addr() < addr) {
       cur = next();
     }
     return cur;
   }
 };
 class VMMemPointerIterator : public MemPointerIterator {
  public:
   VMMemPointerIterator(MemPointerArray* arr):
       MemPointerIterator(arr) {
   }
   // locate an exiting record that contains specified address, or
   // the record, where the record with specified address, should
   // be inserted
   virtual MemPointer* locate(address addr) {
     VMMemRegion* cur = (VMMemRegion*)current();
     VMMemRegion* next_p;
     while (cur != NULL) {
       if (cur->base() > addr) {
         return cur;
       } else {
         // find nearest existing range that has base address <= addr
         next_p = (VMMemRegion*)peek_next();
         if (next_p != NULL && next_p->base() <= addr) {
           cur = (VMMemRegion*)next();
           continue;
         }
       }
       if (cur->is_reserve_record() &&
         cur->base() <= addr &&
         (cur->base() + cur->size() > addr)) {
           return cur;
       } else if (cur->is_commit_record() &&
         cur->base() <= addr &&
         (cur->base() + cur->committed_size() > addr)) {
           return cur;
       }
       cur = (VMMemRegion*)next();
     }
     return NULL;
   }
 #ifdef ASSERT
   virtual bool is_dup_pointer(const MemPointer* ptr1,
     const MemPointer* ptr2) const {
     VMMemRegion* p1 = (VMMemRegion*)ptr1;
     VMMemRegion* p2 = (VMMemRegion*)ptr2;
     if (p1->addr() != p2->addr()) return false;
     if ((p1->flags() & MemPointerRecord::tag_masks) !=
         (p2->flags() & MemPointerRecord::tag_masks)) {
       return false;
     }
     // we do see multiple commit/uncommit on the same memory, it is ok
     return (p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_alloc ||
            (p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_release;
   }
 #endif
 };
 class StagingWalker : public MemPointerArrayIterator {
  private:
   MemPointerArrayIteratorImpl  _itr;
   bool                         _is_vm_record;
   bool                         _end_of_array;
   VMMemRegionEx                _vm_record;
   MemPointerRecordEx           _malloc_record;
  public:
   StagingWalker(MemPointerArray* arr): _itr(arr) {
     _end_of_array = false;
     next();
   }
   // return the pointer at current position
   MemPointer* current() const {
     if (_end_of_array) {
       return NULL;
     }
     if (is_vm_record()) {
       return (MemPointer*)&_vm_record;
     } else {
       return (MemPointer*)&_malloc_record;
     }
   }
   // return the next pointer and advance current position
   MemPointer* next();
   // type of 'current' record
   bool is_vm_record() const {
     return _is_vm_record;
   }
   // return the next poinger without advancing current position
   MemPointer* peek_next() const {
     assert(false, "not supported");
     return NULL;
   }
   MemPointer* peek_prev() const {
     assert(false, "not supported");
     return NULL;
   }
   // remove the pointer at current position
   void remove() {
     assert(false, "not supported");
   }
   // insert the pointer at current position
   bool insert(MemPointer* ptr) {
     assert(false, "not supported");
     return false;
   }
   bool insert_after(MemPointer* ptr) {
     assert(false, "not supported");
     return false;
   }
  private:
   // consolidate all records referring to this vm region
   bool consolidate_vm_records(VMMemRegionEx* vm_rec);
 };
 class MemBaseline;
 class MemSnapshot : public CHeapObj<mtNMT> {
  private:
   // the following two arrays contain records of all known lived memory blocks
   // live malloc-ed memory pointers
   MemPointerArray*      _alloc_ptrs;
   // live virtual memory pointers
   MemPointerArray*      _vm_ptrs;
   // stagging a generation's data, before
   // it can be prompted to snapshot
   MemPointerArray*      _staging_area;
   // the lock to protect this snapshot
   Monitor*              _lock;
   NOT_PRODUCT(size_t    _untracked_count;)
   friend class MemBaseline;
  public:
   MemSnapshot();
   virtual ~MemSnapshot();
   // if we are running out of native memory
   bool out_of_memory() const {
     return (_alloc_ptrs == NULL || _staging_area == NULL ||
       _vm_ptrs == NULL || _lock == NULL ||
       _alloc_ptrs->out_of_memory() ||
       _staging_area->out_of_memory() ||
       _vm_ptrs->out_of_memory());
   }
   // merge a per-thread memory recorder into staging area
   bool merge(MemRecorder* rec);
   // promote staged data to snapshot
   void promote();
   void wait(long timeout) {
     assert(_lock != NULL, "Just check");
     MonitorLockerEx locker(_lock);
     locker.wait(true, timeout);
   }
   NOT_PRODUCT(void print_snapshot_stats(outputStream* st);)
   NOT_PRODUCT(void check_staging_data();)
   NOT_PRODUCT(void check_malloc_pointers();)
   NOT_PRODUCT(bool has_allocation_record(address addr);)
  private:
    // copy pointer data from src to dest
    void copy_pointer(MemPointerRecord* dest, const MemPointerRecord* src);
 };
 #endif // SHARE_VM_SERVICES_MEM_SNAPSHOT_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/services/memSnapshot.hpp@d2a62e0f25eb (annotated)

src/share/vm/services/memSnapshot.hpp