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/*
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* Copyright (c) 2013, 2014, 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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#include "precompiled.hpp"
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#include "runtime/threadCritical.hpp"
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#include "services/virtualMemoryTracker.hpp"
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size_t VirtualMemorySummary::_snapshot[CALC_OBJ_SIZE_IN_TYPE(VirtualMemorySnapshot, size_t)];
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void VirtualMemorySummary::initialize() {
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assert(sizeof(_snapshot) >= sizeof(VirtualMemorySnapshot), "Sanity Check");
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// Use placement operator new to initialize static data area.
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::new ((void*)_snapshot) VirtualMemorySnapshot();
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}
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SortedLinkedList<ReservedMemoryRegion, compare_reserved_region_base> VirtualMemoryTracker::_reserved_regions;
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int compare_committed_region(const CommittedMemoryRegion& r1, const CommittedMemoryRegion& r2) {
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return r1.compare(r2);
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}
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int compare_reserved_region_base(const ReservedMemoryRegion& r1, const ReservedMemoryRegion& r2) {
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return r1.compare(r2);
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}
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bool ReservedMemoryRegion::add_committed_region(address addr, size_t size, const NativeCallStack& stack) {
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assert(addr != NULL, "Invalid address");
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assert(size > 0, "Invalid size");
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assert(contain_region(addr, size), "Not contain this region");
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if (all_committed()) return true;
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CommittedMemoryRegion committed_rgn(addr, size, stack);
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LinkedListNode<CommittedMemoryRegion>* node = _committed_regions.find_node(committed_rgn);
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if (node != NULL) {
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CommittedMemoryRegion* rgn = node->data();
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if (rgn->same_region(addr, size)) {
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return true;
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}
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if (rgn->adjacent_to(addr, size)) {
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// check if the next region covers this committed region,
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// the regions may not be merged due to different call stacks
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LinkedListNode<CommittedMemoryRegion>* next =
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node->next();
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if (next != NULL && next->data()->contain_region(addr, size)) {
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if (next->data()->same_region(addr, size)) {
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next->data()->set_call_stack(stack);
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}
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return true;
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}
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if (rgn->call_stack()->equals(stack)) {
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VirtualMemorySummary::record_uncommitted_memory(rgn->size(), flag());
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// the two adjacent regions have the same call stack, merge them
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rgn->expand_region(addr, size);
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VirtualMemorySummary::record_committed_memory(rgn->size(), flag());
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return true;
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}
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VirtualMemorySummary::record_committed_memory(size, flag());
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if (rgn->base() > addr) {
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return _committed_regions.insert_before(committed_rgn, node) != NULL;
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} else {
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return _committed_regions.insert_after(committed_rgn, node) != NULL;
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}
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}
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assert(rgn->contain_region(addr, size), "Must cover this region");
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return true;
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} else {
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// New committed region
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VirtualMemorySummary::record_committed_memory(size, flag());
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return add_committed_region(committed_rgn);
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}
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}
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void ReservedMemoryRegion::set_all_committed(bool b) {
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if (all_committed() != b) {
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_all_committed = b;
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if (b) {
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VirtualMemorySummary::record_committed_memory(size(), flag());
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}
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}
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}
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bool ReservedMemoryRegion::remove_uncommitted_region(LinkedListNode<CommittedMemoryRegion>* node,
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address addr, size_t size) {
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assert(addr != NULL, "Invalid address");
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assert(size > 0, "Invalid size");
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CommittedMemoryRegion* rgn = node->data();
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assert(rgn->contain_region(addr, size), "Has to be contained");
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assert(!rgn->same_region(addr, size), "Can not be the same region");
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if (rgn->base() == addr ||
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rgn->end() == addr + size) {
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rgn->exclude_region(addr, size);
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return true;
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} else {
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// split this region
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address top =rgn->end();
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// use this region for lower part
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size_t exclude_size = rgn->end() - addr;
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rgn->exclude_region(addr, exclude_size);
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// higher part
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address high_base = addr + size;
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size_t high_size = top - high_base;
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CommittedMemoryRegion high_rgn(high_base, high_size, *rgn->call_stack());
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LinkedListNode<CommittedMemoryRegion>* high_node = _committed_regions.add(high_rgn);
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assert(high_node == NULL || node->next() == high_node, "Should be right after");
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return (high_node != NULL);
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}
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return false;
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}
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bool ReservedMemoryRegion::remove_uncommitted_region(address addr, size_t sz) {
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// uncommit stack guard pages
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if (flag() == mtThreadStack && !same_region(addr, sz)) {
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return true;
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}
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assert(addr != NULL, "Invalid address");
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assert(sz > 0, "Invalid size");
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if (all_committed()) {
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assert(_committed_regions.is_empty(), "Sanity check");
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assert(contain_region(addr, sz), "Reserved region does not contain this region");
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set_all_committed(false);
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VirtualMemorySummary::record_uncommitted_memory(sz, flag());
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if (same_region(addr, sz)) {
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return true;
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} else {
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CommittedMemoryRegion rgn(base(), size(), *call_stack());
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if (rgn.base() == addr || rgn.end() == (addr + sz)) {
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rgn.exclude_region(addr, sz);
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return add_committed_region(rgn);
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} else {
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// split this region
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// top of the whole region
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address top =rgn.end();
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// use this region for lower part
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size_t exclude_size = rgn.end() - addr;
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rgn.exclude_region(addr, exclude_size);
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if (add_committed_region(rgn)) {
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// higher part
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address high_base = addr + sz;
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size_t high_size = top - high_base;
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CommittedMemoryRegion high_rgn(high_base, high_size, NativeCallStack::EMPTY_STACK);
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return add_committed_region(high_rgn);
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} else {
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return false;
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}
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}
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}
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} else {
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// we have to walk whole list to remove the committed regions in
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// specified range
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LinkedListNode<CommittedMemoryRegion>* head =
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_committed_regions.head();
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LinkedListNode<CommittedMemoryRegion>* prev = NULL;
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VirtualMemoryRegion uncommitted_rgn(addr, sz);
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while (head != NULL && !uncommitted_rgn.is_empty()) {
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CommittedMemoryRegion* crgn = head->data();
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// this committed region overlaps to region to uncommit
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if (crgn->overlap_region(uncommitted_rgn.base(), uncommitted_rgn.size())) {
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if (crgn->same_region(uncommitted_rgn.base(), uncommitted_rgn.size())) {
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// find matched region, remove the node will do
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VirtualMemorySummary::record_uncommitted_memory(uncommitted_rgn.size(), flag());
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_committed_regions.remove_after(prev);
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return true;
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} else if (crgn->contain_region(uncommitted_rgn.base(), uncommitted_rgn.size())) {
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// this committed region contains whole uncommitted region
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VirtualMemorySummary::record_uncommitted_memory(uncommitted_rgn.size(), flag());
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return remove_uncommitted_region(head, uncommitted_rgn.base(), uncommitted_rgn.size());
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} else if (uncommitted_rgn.contain_region(crgn->base(), crgn->size())) {
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// this committed region has been uncommitted
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size_t exclude_size = crgn->end() - uncommitted_rgn.base();
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uncommitted_rgn.exclude_region(uncommitted_rgn.base(), exclude_size);
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VirtualMemorySummary::record_uncommitted_memory(crgn->size(), flag());
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LinkedListNode<CommittedMemoryRegion>* tmp = head;
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head = head->next();
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_committed_regions.remove_after(prev);
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continue;
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} else if (crgn->contain_address(uncommitted_rgn.base())) {
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size_t toUncommitted = crgn->end() - uncommitted_rgn.base();
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crgn->exclude_region(uncommitted_rgn.base(), toUncommitted);
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uncommitted_rgn.exclude_region(uncommitted_rgn.base(), toUncommitted);
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VirtualMemorySummary::record_uncommitted_memory(toUncommitted, flag());
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} else if (uncommitted_rgn.contain_address(crgn->base())) {
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size_t toUncommitted = uncommitted_rgn.end() - crgn->base();
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crgn->exclude_region(crgn->base(), toUncommitted);
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uncommitted_rgn.exclude_region(uncommitted_rgn.end() - toUncommitted,
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toUncommitted);
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VirtualMemorySummary::record_uncommitted_memory(toUncommitted, flag());
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}
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}
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prev = head;
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head = head->next();
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}
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}
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return true;
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}
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void ReservedMemoryRegion::move_committed_regions(address addr, ReservedMemoryRegion& rgn) {
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assert(addr != NULL, "Invalid address");
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// split committed regions
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LinkedListNode<CommittedMemoryRegion>* head =
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_committed_regions.head();
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LinkedListNode<CommittedMemoryRegion>* prev = NULL;
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while (head != NULL) {
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if (head->data()->base() >= addr) {
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break;
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}
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prev = head;
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head = head->next();
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}
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if (head != NULL) {
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if (prev != NULL) {
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prev->set_next(head->next());
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} else {
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_committed_regions.set_head(NULL);
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}
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}
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rgn._committed_regions.set_head(head);
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}
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size_t ReservedMemoryRegion::committed_size() const {
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if (all_committed()) {
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return size();
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} else {
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size_t committed = 0;
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LinkedListNode<CommittedMemoryRegion>* head =
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_committed_regions.head();
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while (head != NULL) {
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committed += head->data()->size();
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head = head->next();
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}
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return committed;
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}
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}
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void ReservedMemoryRegion::set_flag(MEMFLAGS f) {
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assert((flag() == mtNone || flag() == f), "Overwrite memory type");
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if (flag() != f) {
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VirtualMemorySummary::move_reserved_memory(flag(), f, size());
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VirtualMemorySummary::move_committed_memory(flag(), f, committed_size());
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_flag = f;
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}
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}
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bool VirtualMemoryTracker::initialize(NMT_TrackingLevel level) {
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if (level >= NMT_summary) {
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VirtualMemorySummary::initialize();
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}
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return true;
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}
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bool VirtualMemoryTracker::add_reserved_region(address base_addr, size_t size,
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const NativeCallStack& stack, MEMFLAGS flag, bool all_committed) {
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assert(base_addr != NULL, "Invalid address");
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assert(size > 0, "Invalid size");
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ReservedMemoryRegion rgn(base_addr, size, stack, flag);
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ReservedMemoryRegion* reserved_rgn = _reserved_regions.find(rgn);
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LinkedListNode<ReservedMemoryRegion>* node;
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if (reserved_rgn == NULL) {
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VirtualMemorySummary::record_reserved_memory(size, flag);
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node = _reserved_regions.add(rgn);
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if (node != NULL) {
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node->data()->set_all_committed(all_committed);
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return true;
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} else {
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return false;
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}
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} else {
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if (reserved_rgn->same_region(base_addr, size)) {
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reserved_rgn->set_call_stack(stack);
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reserved_rgn->set_flag(flag);
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return true;
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} else if (reserved_rgn->adjacent_to(base_addr, size)) {
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VirtualMemorySummary::record_reserved_memory(size, flag);
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reserved_rgn->expand_region(base_addr, size);
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reserved_rgn->set_call_stack(stack);
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return true;
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} else {
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// Overlapped reservation.
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// It can happen when the regions are thread stacks, as JNI
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// thread does not detach from VM before exits, and leads to
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// leak JavaThread object
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if (reserved_rgn->flag() == mtThreadStack) {
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guarantee(!CheckJNICalls, "Attached JNI thread exited without being detached");
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// Overwrite with new region
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// Release old region
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VirtualMemorySummary::record_uncommitted_memory(reserved_rgn->committed_size(), reserved_rgn->flag());
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VirtualMemorySummary::record_released_memory(reserved_rgn->size(), reserved_rgn->flag());
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// Add new region
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VirtualMemorySummary::record_reserved_memory(rgn.size(), flag);
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*reserved_rgn = rgn;
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return true;
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} else {
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ShouldNotReachHere();
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return false;
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}
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}
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}
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}
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void VirtualMemoryTracker::set_reserved_region_type(address addr, MEMFLAGS flag) {
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assert(addr != NULL, "Invalid address");
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ReservedMemoryRegion rgn(addr, 1);
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ReservedMemoryRegion* reserved_rgn = _reserved_regions.find(rgn);
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if (reserved_rgn != NULL) {
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assert(reserved_rgn->contain_address(addr), "Containment");
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if (reserved_rgn->flag() != flag) {
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assert(reserved_rgn->flag() == mtNone, "Overwrite memory type");
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reserved_rgn->set_flag(flag);
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}
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}
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}
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bool VirtualMemoryTracker::add_committed_region(address addr, size_t size,
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const NativeCallStack& stack) {
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assert(addr != NULL, "Invalid address");
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assert(size > 0, "Invalid size");
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ReservedMemoryRegion rgn(addr, size);
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ReservedMemoryRegion* reserved_rgn = _reserved_regions.find(rgn);
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assert(reserved_rgn != NULL, "No reserved region");
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assert(reserved_rgn->contain_region(addr, size), "Not completely contained");
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return reserved_rgn->add_committed_region(addr, size, stack);
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}
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bool VirtualMemoryTracker::remove_uncommitted_region(address addr, size_t size) {
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assert(addr != NULL, "Invalid address");
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assert(size > 0, "Invalid size");
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ReservedMemoryRegion rgn(addr, size);
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ReservedMemoryRegion* reserved_rgn = _reserved_regions.find(rgn);
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assert(reserved_rgn != NULL, "No reserved region");
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assert(reserved_rgn->contain_region(addr, size), "Not completely contained");
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return reserved_rgn->remove_uncommitted_region(addr, size);
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}
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bool VirtualMemoryTracker::remove_released_region(address addr, size_t size) {
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assert(addr != NULL, "Invalid address");
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assert(size > 0, "Invalid size");
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ReservedMemoryRegion rgn(addr, size);
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ReservedMemoryRegion* reserved_rgn = _reserved_regions.find(rgn);
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assert(reserved_rgn != NULL, "No reserved region");
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384 |
// uncommit regions within the released region
|
|
385 |
if (!reserved_rgn->remove_uncommitted_region(addr, size)) {
|
|
386 |
return false;
|
|
387 |
}
|
|
388 |
|
|
389 |
|
|
390 |
VirtualMemorySummary::record_released_memory(size, reserved_rgn->flag());
|
|
391 |
|
|
392 |
if (reserved_rgn->same_region(addr, size)) {
|
|
393 |
return _reserved_regions.remove(rgn);
|
|
394 |
} else {
|
|
395 |
assert(reserved_rgn->contain_region(addr, size), "Not completely contained");
|
|
396 |
if (reserved_rgn->base() == addr ||
|
|
397 |
reserved_rgn->end() == addr + size) {
|
|
398 |
reserved_rgn->exclude_region(addr, size);
|
|
399 |
return true;
|
|
400 |
} else {
|
|
401 |
address top = reserved_rgn->end();
|
|
402 |
address high_base = addr + size;
|
|
403 |
ReservedMemoryRegion high_rgn(high_base, top - high_base,
|
|
404 |
*reserved_rgn->call_stack(), reserved_rgn->flag());
|
|
405 |
|
|
406 |
// use original region for lower region
|
|
407 |
reserved_rgn->exclude_region(addr, top - addr);
|
|
408 |
LinkedListNode<ReservedMemoryRegion>* new_rgn = _reserved_regions.add(high_rgn);
|
|
409 |
if (new_rgn == NULL) {
|
|
410 |
return false;
|
|
411 |
} else {
|
|
412 |
reserved_rgn->move_committed_regions(addr, *new_rgn->data());
|
|
413 |
return true;
|
|
414 |
}
|
|
415 |
}
|
|
416 |
}
|
|
417 |
}
|
|
418 |
|
|
419 |
|
|
420 |
bool VirtualMemoryTracker::walk_virtual_memory(VirtualMemoryWalker* walker) {
|
|
421 |
ThreadCritical tc;
|
|
422 |
LinkedListNode<ReservedMemoryRegion>* head = _reserved_regions.head();
|
|
423 |
while (head != NULL) {
|
|
424 |
const ReservedMemoryRegion* rgn = head->peek();
|
|
425 |
if (!walker->do_allocation_site(rgn)) {
|
|
426 |
return false;
|
|
427 |
}
|
|
428 |
head = head->next();
|
|
429 |
}
|
|
430 |
return true;
|
|
431 |
}
|
|
432 |
|
|
433 |
// Transition virtual memory tracking level.
|
|
434 |
bool VirtualMemoryTracker::transition(NMT_TrackingLevel from, NMT_TrackingLevel to) {
|
|
435 |
if (from == NMT_minimal) {
|
|
436 |
assert(to == NMT_summary || to == NMT_detail, "Just check");
|
|
437 |
VirtualMemorySummary::reset();
|
|
438 |
} else if (to == NMT_minimal) {
|
|
439 |
assert(from == NMT_summary || from == NMT_detail, "Just check");
|
|
440 |
// Clean up virtual memory tracking data structures.
|
|
441 |
ThreadCritical tc;
|
|
442 |
_reserved_regions.clear();
|
|
443 |
}
|
|
444 |
|
|
445 |
return true;
|
|
446 |
}
|
|
447 |
|
|
448 |
|