author | zgu |
Tue, 11 Sep 2012 20:53:17 -0400 | |
changeset 13744 | 631fe815def5 |
parent 13470 | a99b4dc12f9b |
child 14120 | 7d298141c258 |
permissions | -rw-r--r-- |
13195 | 1 |
/* |
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* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_SERVICES_MEM_SNAPSHOT_HPP |
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#define SHARE_VM_SERVICES_MEM_SNAPSHOT_HPP |
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#include "memory/allocation.hpp" |
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#include "runtime/mutex.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "services/memBaseline.hpp" |
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#include "services/memPtrArray.hpp" |
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// Snapshot pointer array iterator |
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// The pointer array contains malloc-ed pointers |
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class MemPointerIterator : public MemPointerArrayIteratorImpl { |
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public: |
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MemPointerIterator(MemPointerArray* arr): |
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MemPointerArrayIteratorImpl(arr) { |
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assert(arr != NULL, "null array"); |
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} |
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#ifdef ASSERT |
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virtual bool is_dup_pointer(const MemPointer* ptr1, |
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const MemPointer* ptr2) const { |
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MemPointerRecord* p1 = (MemPointerRecord*)ptr1; |
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MemPointerRecord* p2 = (MemPointerRecord*)ptr2; |
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if (p1->addr() != p2->addr()) return false; |
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if ((p1->flags() & MemPointerRecord::tag_masks) != |
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(p2->flags() & MemPointerRecord::tag_masks)) { |
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return false; |
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} |
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// we do see multiple commit/uncommit on the same memory, it is ok |
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return (p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_alloc || |
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(p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_release; |
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} |
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virtual bool insert(MemPointer* ptr) { |
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if (_pos > 0) { |
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MemPointer* p1 = (MemPointer*)ptr; |
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MemPointer* p2 = (MemPointer*)_array->at(_pos - 1); |
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assert(!is_dup_pointer(p1, p2), |
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err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags())); |
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} |
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if (_pos < _array->length() -1) { |
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MemPointer* p1 = (MemPointer*)ptr; |
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MemPointer* p2 = (MemPointer*)_array->at(_pos + 1); |
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assert(!is_dup_pointer(p1, p2), |
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err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags())); |
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} |
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return _array->insert_at(ptr, _pos); |
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} |
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virtual bool insert_after(MemPointer* ptr) { |
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if (_pos > 0) { |
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MemPointer* p1 = (MemPointer*)ptr; |
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MemPointer* p2 = (MemPointer*)_array->at(_pos - 1); |
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assert(!is_dup_pointer(p1, p2), |
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err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags())); |
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} |
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if (_pos < _array->length() - 1) { |
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MemPointer* p1 = (MemPointer*)ptr; |
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MemPointer* p2 = (MemPointer*)_array->at(_pos + 1); |
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assert(!is_dup_pointer(p1, p2), |
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err_msg("duplicated pointer, flag = [%x]", (unsigned int)((MemPointerRecord*)p1)->flags())); |
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} |
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if (_array->insert_at(ptr, _pos + 1)) { |
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_pos ++; |
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return true; |
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} |
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return false; |
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} |
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#endif |
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virtual MemPointer* locate(address addr) { |
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MemPointer* cur = current(); |
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while (cur != NULL && cur->addr() < addr) { |
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cur = next(); |
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} |
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return cur; |
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} |
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}; |
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class VMMemPointerIterator : public MemPointerIterator { |
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public: |
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VMMemPointerIterator(MemPointerArray* arr): |
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MemPointerIterator(arr) { |
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} |
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// locate an existing record that contains specified address, or |
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// the record, where the record with specified address, should |
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// be inserted. |
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// virtual memory record array is sorted in address order, so |
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// binary search is performed |
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virtual MemPointer* locate(address addr) { |
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int index_low = 0; |
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int index_high = _array->length(); |
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int index_mid = (index_high + index_low) / 2; |
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int r = 1; |
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while (index_low < index_high && (r = compare(index_mid, addr)) != 0) { |
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if (r > 0) { |
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index_high = index_mid; |
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} else { |
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index_low = index_mid; |
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} |
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index_mid = (index_high + index_low) / 2; |
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} |
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if (r == 0) { |
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// update current location |
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_pos = index_mid; |
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return _array->at(index_mid); |
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} else { |
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return NULL; |
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} |
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} |
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#ifdef ASSERT |
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virtual bool is_dup_pointer(const MemPointer* ptr1, |
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const MemPointer* ptr2) const { |
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VMMemRegion* p1 = (VMMemRegion*)ptr1; |
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VMMemRegion* p2 = (VMMemRegion*)ptr2; |
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if (p1->addr() != p2->addr()) return false; |
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if ((p1->flags() & MemPointerRecord::tag_masks) != |
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(p2->flags() & MemPointerRecord::tag_masks)) { |
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return false; |
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} |
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// we do see multiple commit/uncommit on the same memory, it is ok |
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return (p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_alloc || |
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(p1->flags() & MemPointerRecord::tag_masks) == MemPointerRecord::tag_release; |
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} |
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#endif |
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// compare if an address falls into a memory region, |
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// return 0, if the address falls into a memory region at specified index |
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// return 1, if memory region pointed by specified index is higher than the address |
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// return -1, if memory region pointed by specified index is lower than the address |
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int compare(int index, address addr) const { |
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VMMemRegion* r = (VMMemRegion*)_array->at(index); |
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assert(r->is_reserve_record(), "Sanity check"); |
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if (r->addr() > addr) { |
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return 1; |
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} else if (r->addr() + r->reserved_size() <= addr) { |
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return -1; |
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} else { |
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return 0; |
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} |
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} |
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}; |
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class MallocRecordIterator : public MemPointerArrayIterator { |
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private: |
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MemPointerArrayIteratorImpl _itr; |
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public: |
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MallocRecordIterator(MemPointerArray* arr) : _itr(arr) { |
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} |
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MemPointer* current() const { |
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MemPointerRecord* cur = (MemPointerRecord*)_itr.current(); |
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assert(cur == NULL || !cur->is_vm_pointer(), "seek error"); |
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MemPointerRecord* next = (MemPointerRecord*)_itr.peek_next(); |
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if (next == NULL || next->addr() != cur->addr()) { |
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return cur; |
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} else { |
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assert(!cur->is_vm_pointer(), "Sanity check"); |
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assert(cur->is_allocation_record() && next->is_deallocation_record(), |
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"sorting order"); |
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assert(cur->seq() != next->seq(), "Sanity check"); |
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return cur->seq() > next->seq() ? cur : next; |
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} |
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} |
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||
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MemPointer* next() { |
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MemPointerRecord* cur = (MemPointerRecord*)_itr.current(); |
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assert(cur == NULL || !cur->is_vm_pointer(), "Sanity check"); |
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MemPointerRecord* next = (MemPointerRecord*)_itr.next(); |
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if (next == NULL) { |
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return NULL; |
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} |
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if (cur->addr() == next->addr()) { |
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next = (MemPointerRecord*)_itr.next(); |
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} |
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return current(); |
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} |
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MemPointer* peek_next() const { ShouldNotReachHere(); return NULL; } |
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MemPointer* peek_prev() const { ShouldNotReachHere(); return NULL; } |
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void remove() { ShouldNotReachHere(); } |
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bool insert(MemPointer* ptr) { ShouldNotReachHere(); return false; } |
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bool insert_after(MemPointer* ptr) { ShouldNotReachHere(); return false; } |
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}; |
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|
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class StagingArea : public _ValueObj { |
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private: |
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MemPointerArray* _malloc_data; |
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MemPointerArray* _vm_data; |
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|
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public: |
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StagingArea() : _malloc_data(NULL), _vm_data(NULL) { |
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init(); |
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} |
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~StagingArea() { |
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if (_malloc_data != NULL) delete _malloc_data; |
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if (_vm_data != NULL) delete _vm_data; |
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} |
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|
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MallocRecordIterator malloc_record_walker() { |
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return MallocRecordIterator(malloc_data()); |
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} |
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MemPointerArrayIteratorImpl virtual_memory_record_walker(); |
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bool init(); |
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void clear() { |
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assert(_malloc_data != NULL && _vm_data != NULL, "Just check"); |
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_malloc_data->shrink(); |
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_malloc_data->clear(); |
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_vm_data->clear(); |
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} |
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inline MemPointerArray* malloc_data() { return _malloc_data; } |
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inline MemPointerArray* vm_data() { return _vm_data; } |
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}; |
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class MemBaseline; |
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class MemSnapshot : public CHeapObj<mtNMT> { |
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private: |
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// the following two arrays contain records of all known lived memory blocks |
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// live malloc-ed memory pointers |
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MemPointerArray* _alloc_ptrs; |
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// live virtual memory pointers |
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MemPointerArray* _vm_ptrs; |
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StagingArea _staging_area; |
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// the lock to protect this snapshot |
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Monitor* _lock; |
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NOT_PRODUCT(size_t _untracked_count;) |
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friend class MemBaseline; |
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public: |
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MemSnapshot(); |
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virtual ~MemSnapshot(); |
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// if we are running out of native memory |
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bool out_of_memory() { |
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return (_alloc_ptrs == NULL || |
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_staging_area.malloc_data() == NULL || |
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_staging_area.vm_data() == NULL || |
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_vm_ptrs == NULL || _lock == NULL || |
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_alloc_ptrs->out_of_memory() || |
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_vm_ptrs->out_of_memory()); |
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} |
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// merge a per-thread memory recorder into staging area |
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bool merge(MemRecorder* rec); |
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// promote staged data to snapshot |
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bool promote(); |
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void wait(long timeout) { |
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assert(_lock != NULL, "Just check"); |
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MonitorLockerEx locker(_lock); |
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locker.wait(true, timeout); |
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} |
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NOT_PRODUCT(void print_snapshot_stats(outputStream* st);) |
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NOT_PRODUCT(void check_staging_data();) |
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NOT_PRODUCT(void check_malloc_pointers();) |
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NOT_PRODUCT(bool has_allocation_record(address addr);) |
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private: |
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// copy pointer data from src to dest |
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void copy_pointer(MemPointerRecord* dest, const MemPointerRecord* src); |
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|
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bool promote_malloc_records(MemPointerArrayIterator* itr); |
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bool promote_virtual_memory_records(MemPointerArrayIterator* itr); |
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}; |
304 |
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#endif // SHARE_VM_SERVICES_MEM_SNAPSHOT_HPP |