jdk8-mips64-public/hotspot: src/share/vm/services/memSnapshot.hpp@33143ee07800 (annotated)

src/share/vm/services/memSnapshot.hpp@33143ee07800 (annotated)

src/share/vm/services/memSnapshot.hpp

Tue, 11 Sep 2012 20:53:17 -0400

author: zgu
date: Tue, 11 Sep 2012 20:53:17 -0400
changeset 4053: 33143ee07800
parent 3986: 4acebbe310e1
child 4193: 716c64bda5ba
permissions: -rw-r--r--

7181995: NMT ON: NMT assertion failure assert(cur_vm->is_uncommit_record() || cur_vm->is_deallocation_record
Summary: Fixed virtual memory records merge and promotion logic, should be based on sequence number vs. base address order
Reviewed-by: coleenp, acorn

 /*
  * 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),
         err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags()));
     }
      if (_pos < _array->length() -1) {
       MemPointer* p1 = (MemPointer*)ptr;
       MemPointer* p2 = (MemPointer*)_array->at(_pos + 1);
       assert(!is_dup_pointer(p1, p2),
         err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags()));
      }
     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),
         err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags()));
     }
     if (_pos < _array->length() - 1) {
       MemPointer* p1 = (MemPointer*)ptr;
       MemPointer* p2 = (MemPointer*)_array->at(_pos + 1);
       assert(!is_dup_pointer(p1, p2),
         err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags()));
      }
     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 existing record that contains specified address, or
   // the record, where the record with specified address, should
   // be inserted.
   // virtual memory record array is sorted in address order, so
   // binary search is performed
   virtual MemPointer* locate(address addr) {
     int index_low = 0;
     int index_high = _array->length();
     int index_mid = (index_high + index_low) / 2;
     int r = 1;
     while (index_low < index_high && (r = compare(index_mid, addr)) != 0) {
       if (r > 0) {
         index_high = index_mid;
       } else {
         index_low = index_mid;
       }
       index_mid = (index_high + index_low) / 2;
     }
     if (r == 0) {
       // update current location
       _pos = index_mid;
       return _array->at(index_mid);
     } else {
       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
   // compare if an address falls into a memory region,
   // return 0, if the address falls into a memory region at specified index
   // return 1, if memory region pointed by specified index is higher than the address
   // return -1, if memory region pointed by specified index is lower than the address
   int compare(int index, address addr) const {
     VMMemRegion* r = (VMMemRegion*)_array->at(index);
     assert(r->is_reserve_record(), "Sanity check");
     if (r->addr() > addr) {
       return 1;
     } else if (r->addr() + r->reserved_size() <= addr) {
       return -1;
     } else {
       return 0;
     }
   }
 };
 class MallocRecordIterator : public MemPointerArrayIterator {
  private:
   MemPointerArrayIteratorImpl  _itr;
  public:
   MallocRecordIterator(MemPointerArray* arr) : _itr(arr) {
   }
   MemPointer* current() const {
     MemPointerRecord* cur = (MemPointerRecord*)_itr.current();
     assert(cur == NULL || !cur->is_vm_pointer(), "seek error");
     MemPointerRecord* next = (MemPointerRecord*)_itr.peek_next();
     if (next == NULL || next->addr() != cur->addr()) {
       return cur;
     } else {
       assert(!cur->is_vm_pointer(), "Sanity check");
       assert(cur->is_allocation_record() && next->is_deallocation_record(),
              "sorting order");
       assert(cur->seq() != next->seq(), "Sanity check");
       return cur->seq() >  next->seq() ? cur : next;
     }
   }
   MemPointer* next() {
     MemPointerRecord* cur = (MemPointerRecord*)_itr.current();
     assert(cur == NULL || !cur->is_vm_pointer(), "Sanity check");
     MemPointerRecord* next = (MemPointerRecord*)_itr.next();
     if (next == NULL) {
       return NULL;
     }
     if (cur->addr() == next->addr()) {
       next = (MemPointerRecord*)_itr.next();
     }
     return current();
   }
   MemPointer* peek_next() const      { ShouldNotReachHere(); return NULL; }
   MemPointer* peek_prev() const      { ShouldNotReachHere(); return NULL; }
   void remove()                      { ShouldNotReachHere(); }
   bool insert(MemPointer* ptr)       { ShouldNotReachHere(); return false; }
   bool insert_after(MemPointer* ptr) { ShouldNotReachHere(); return false; }
 };
 class StagingArea : public _ValueObj {
  private:
   MemPointerArray*   _malloc_data;
   MemPointerArray*   _vm_data;
  public:
   StagingArea() : _malloc_data(NULL), _vm_data(NULL) {
     init();
   }
   ~StagingArea() {
     if (_malloc_data != NULL) delete _malloc_data;
     if (_vm_data != NULL) delete _vm_data;
   }
   MallocRecordIterator malloc_record_walker() {
     return MallocRecordIterator(malloc_data());
   }
   MemPointerArrayIteratorImpl virtual_memory_record_walker();
   bool init();
   void clear() {
     assert(_malloc_data != NULL && _vm_data != NULL, "Just check");
     _malloc_data->shrink();
     _malloc_data->clear();
     _vm_data->clear();
   }
   inline MemPointerArray* malloc_data() { return _malloc_data; }
   inline MemPointerArray* vm_data()     { return _vm_data; }
 };
 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;
   StagingArea           _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() {
     return (_alloc_ptrs == NULL ||
       _staging_area.malloc_data() == NULL ||
       _staging_area.vm_data() == NULL ||
       _vm_ptrs == NULL || _lock == NULL ||
       _alloc_ptrs->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
   bool 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);
    bool promote_malloc_records(MemPointerArrayIterator* itr);
    bool promote_virtual_memory_records(MemPointerArrayIterator* itr);
 };
 #endif // SHARE_VM_SERVICES_MEM_SNAPSHOT_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/services/memSnapshot.hpp@33143ee07800 (annotated)

src/share/vm/services/memSnapshot.hpp