91 lines
3.6 KiB
C++
91 lines
3.6 KiB
C++
/*
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* Copyright (c) 2019, Red Hat, Inc. 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_SERVICES_THREADSTACKTRACKER_HPP
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#define SHARE_SERVICES_THREADSTACKTRACKER_HPP
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#if INCLUDE_NMT
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#include "services/allocationSite.hpp"
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#include "services/mallocSiteTable.hpp"
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#include "services/nmtCommon.hpp"
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#include "utilities/nativeCallStack.hpp"
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#include "utilities/linkedlist.hpp"
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class SimpleThreadStackSite : public AllocationSite {
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const address _base;
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const size_t _size;
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public:
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SimpleThreadStackSite(address base, size_t size, const NativeCallStack& stack) :
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AllocationSite(stack, mtThreadStack),
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_base(base),
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_size(size) {}
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bool equals(const SimpleThreadStackSite& mts) const {
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bool eq = base() == mts.base();
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assert(!eq || size() == mts.size(), "Must match");
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return eq;
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}
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size_t size() const { return _size; }
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address base() const { return _base; }
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};
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/*
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* Most of platforms, that hotspot support, have their thread stacks backed by
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* virtual memory by default. For these cases, thread stack tracker simply
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* delegates tracking to virtual memory tracker.
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* However, there are exceptions, (e.g. AIX), that platforms can provide stacks
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* that are not page aligned. A hypothetical VM implementation, it can provide
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* it own stacks. In these case, track_as_vm() should return false and manage
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* stack tracking by this tracker internally.
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* During memory snapshot, tracked thread stacks memory data is walked and stored
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* along with malloc'd data inside baseline. The regions are not scanned and assumed
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* all committed for now. Can add scanning phase when there is a need.
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*/
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class ThreadStackTracker : AllStatic {
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private:
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static volatile size_t _thread_count;
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static int compare_thread_stack_base(const SimpleThreadStackSite& s1, const SimpleThreadStackSite& s2);
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static SortedLinkedList<SimpleThreadStackSite, compare_thread_stack_base>* _simple_thread_stacks;
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public:
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// Late phase initialization
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static bool late_initialize(NMT_TrackingLevel level);
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static bool transition(NMT_TrackingLevel from, NMT_TrackingLevel to);
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static void new_thread_stack(void* base, size_t size, const NativeCallStack& stack);
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static void delete_thread_stack(void* base, size_t size);
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static bool track_as_vm() { return AIX_ONLY(false) NOT_AIX(true); }
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static size_t thread_count() { return _thread_count; }
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// Snapshot support. Piggyback thread stack data in malloc slot, NMT always handles
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// thread stack slot specially since beginning.
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static bool walk_simple_thread_stack_site(MallocSiteWalker* walker);
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};
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#endif // INCLUDE_NMT
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#endif // SHARE_SERVICES_THREADSTACKTRACKER_HPP
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