author | zgu |
Fri, 19 Oct 2012 21:40:07 -0400 | |
changeset 14120 | 7d298141c258 |
parent 13744 | 631fe815def5 |
child 14484 | 901d216b74bf |
permissions | -rw-r--r-- |
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/* |
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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 reserved memory region that contains specified address, |
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// or the reserved region just above this address, where the incoming |
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// reserved region should be inserted. |
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virtual MemPointer* locate(address addr) { |
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reset(); |
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VMMemRegion* reg = (VMMemRegion*)current(); |
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while (reg != NULL) { |
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if (reg->is_reserved_region()) { |
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if (reg->contains_address(addr) || addr < reg->base()) { |
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return reg; |
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} |
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} |
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reg = (VMMemRegion*)next(); |
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} |
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return NULL; |
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} |
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// following methods update virtual memory in the context |
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// of 'current' position, which is properly positioned by |
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// callers via locate method. |
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bool add_reserved_region(MemPointerRecord* rec); |
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bool add_committed_region(MemPointerRecord* rec); |
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bool remove_uncommitted_region(MemPointerRecord* rec); |
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bool remove_released_region(MemPointerRecord* rec); |
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// split a reserved region to create a new memory region with specified base and size |
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bool split_reserved_region(VMMemRegion* rgn, address new_rgn_addr, size_t new_rgn_size); |
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private: |
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bool insert_record(MemPointerRecord* rec); |
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bool insert_record_after(MemPointerRecord* rec); |
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bool insert_reserved_region(MemPointerRecord* rec); |
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// reset current position |
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inline void reset() { _pos = 0; } |
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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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}; |
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class MallocRecordIterator : public MemPointerArrayIterator { |
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protected: |
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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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virtual 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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virtual 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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// collapse duplicated records. Eliminating duplicated records here, is much |
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// cheaper than during promotion phase. However, it does have limitation - it |
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// can only eliminate duplicated records within the generation, there are |
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// still chances seeing duplicated records during promotion. |
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// We want to use the record with higher sequence number, because it has |
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// more accurate callsite pc. |
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class VMRecordIterator : public MallocRecordIterator { |
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public: |
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VMRecordIterator(MemPointerArray* arr) : MallocRecordIterator(arr) { |
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MemPointerRecord* cur = (MemPointerRecord*)_itr.current(); |
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MemPointerRecord* next = (MemPointerRecord*)_itr.peek_next(); |
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while (next != NULL) { |
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assert(cur != NULL, "Sanity check"); |
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assert(((SeqMemPointerRecord*)next)->seq() > ((SeqMemPointerRecord*)cur)->seq(), |
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"pre-sort order"); |
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|
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if (is_duplicated_record(cur, next)) { |
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_itr.next(); |
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next = (MemPointerRecord*)_itr.peek_next(); |
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} else { |
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break; |
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} |
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} |
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} |
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|
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virtual MemPointer* current() const { |
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return _itr.current(); |
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} |
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|
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// get next record, but skip the duplicated records |
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virtual MemPointer* next() { |
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MemPointerRecord* cur = (MemPointerRecord*)_itr.next(); |
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MemPointerRecord* next = (MemPointerRecord*)_itr.peek_next(); |
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while (next != NULL) { |
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assert(cur != NULL, "Sanity check"); |
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assert(((SeqMemPointerRecord*)next)->seq() > ((SeqMemPointerRecord*)cur)->seq(), |
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"pre-sort order"); |
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|
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if (is_duplicated_record(cur, next)) { |
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_itr.next(); |
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cur = next; |
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next = (MemPointerRecord*)_itr.peek_next(); |
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} else { |
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break; |
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} |
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} |
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return cur; |
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} |
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|
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private: |
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bool is_duplicated_record(MemPointerRecord* p1, MemPointerRecord* p2) const { |
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bool ret = (p1->addr() == p2->addr() && p1->size() == p2->size() && p1->flags() == p2->flags()); |
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assert(!(ret && FLAGS_TO_MEMORY_TYPE(p1->flags()) == mtThreadStack), "dup on stack record"); |
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return ret; |
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} |
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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(); |
13195 | 275 |
} |
276 |
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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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281 |
|
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MallocRecordIterator malloc_record_walker() { |
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return MallocRecordIterator(malloc_data()); |
13195 | 284 |
} |
285 |
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VMRecordIterator virtual_memory_record_walker(); |
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|
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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(); |
13195 | 294 |
} |
295 |
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inline MemPointerArray* malloc_data() { return _malloc_data; } |
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inline MemPointerArray* vm_data() { return _vm_data; } |
13195 | 298 |
}; |
299 |
||
300 |
class MemBaseline; |
|
301 |
class MemSnapshot : public CHeapObj<mtNMT> { |
|
302 |
private: |
|
303 |
// the following two arrays contain records of all known lived memory blocks |
|
304 |
// live malloc-ed memory pointers |
|
305 |
MemPointerArray* _alloc_ptrs; |
|
306 |
// live virtual memory pointers |
|
307 |
MemPointerArray* _vm_ptrs; |
|
308 |
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309 |
StagingArea _staging_area; |
13195 | 310 |
|
311 |
// the lock to protect this snapshot |
|
312 |
Monitor* _lock; |
|
313 |
||
314 |
NOT_PRODUCT(size_t _untracked_count;) |
|
315 |
friend class MemBaseline; |
|
316 |
||
317 |
public: |
|
318 |
MemSnapshot(); |
|
319 |
virtual ~MemSnapshot(); |
|
320 |
||
321 |
// 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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325 |
_staging_area.vm_data() == NULL || |
13195 | 326 |
_vm_ptrs == NULL || _lock == NULL || |
327 |
_alloc_ptrs->out_of_memory() || |
|
328 |
_vm_ptrs->out_of_memory()); |
|
329 |
} |
|
330 |
||
331 |
// merge a per-thread memory recorder into staging area |
|
332 |
bool merge(MemRecorder* rec); |
|
333 |
// promote staged data to snapshot |
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bool promote(); |
13195 | 335 |
|
336 |
||
337 |
void wait(long timeout) { |
|
338 |
assert(_lock != NULL, "Just check"); |
|
339 |
MonitorLockerEx locker(_lock); |
|
340 |
locker.wait(true, timeout); |
|
341 |
} |
|
342 |
||
343 |
NOT_PRODUCT(void print_snapshot_stats(outputStream* st);) |
|
344 |
NOT_PRODUCT(void check_staging_data();) |
|
345 |
NOT_PRODUCT(void check_malloc_pointers();) |
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346 |
NOT_PRODUCT(bool has_allocation_record(address addr);) |
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// dump all virtual memory pointers in snapshot |
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348 |
DEBUG_ONLY( void dump_all_vm_pointers();) |
13195 | 349 |
|
350 |
private: |
|
351 |
// copy pointer data from src to dest |
|
352 |
void copy_pointer(MemPointerRecord* dest, const MemPointerRecord* src); |
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353 |
|
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354 |
bool promote_malloc_records(MemPointerArrayIterator* itr); |
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355 |
bool promote_virtual_memory_records(MemPointerArrayIterator* itr); |
13195 | 356 |
}; |
357 |
||
358 |
#endif // SHARE_VM_SERVICES_MEM_SNAPSHOT_HPP |