1 /* 2 * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved. 3 * 4 * This file is part of the Lock Contention Tracing Subsystem for the HotSpot 5 * Virtual Machine, which is developed at Christian Doppler Laboratory on 6 * Monitoring and Evolution of Very-Large-Scale Software Systems. Please 7 * contact us at <http://mevss.jku.at/> if you need additional information 8 * or have any questions. 9 * 10 * This code is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License version 2 only, as 12 * published by the Free Software Foundation. 13 * 14 * This code is distributed in the hope that it will be useful, but WITHOUT 15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 17 * version 2 for more details (a copy is included in the LICENSE file that 18 * accompanied this code). 19 * 20 * You should have received a copy of the GNU General Public License version 21 * 2 along with this work. If not, see <http://www.gnu.org/licenses/>. 22 * 23 */ 24 25 #include "evtrace/traceMetadata.hpp" 26 27 TraceMetadata::TraceMetadata() { 28 _stack_cache = new TraceStackCache(this); 29 _last_stack_id = 0; 30 _last_global_seq = 0; 31 } 32 33 TraceMetadata::~TraceMetadata() { 34 delete _stack_cache; 35 } 36 37 class TraceMetadata::MarkKlassUnknownClosure: public KlassClosure { 38 static void mark_unknown(Method *m) { 39 m->reset_tracing_known(); 40 } 41 42 public: 43 virtual void do_klass(Klass *k) { 44 k->reset_tracing_known(); 45 if (k->oop_is_instance()) { 46 InstanceKlass::cast(k)->methods_do(mark_unknown); 47 } 48 } 49 }; 50 51 class TraceMetadata::ClearInvalidatedMementoStacksClosure: public ThreadClosure { 52 virtual void do_thread(Thread *t) { 53 assert(t != NULL, "null thread"); 54 if (t->memento_stack_trace() != NULL && !t->memento_stack_trace()->is_valid()) { 55 t->set_memento_stack_trace(NULL); 56 } 57 } 58 }; 59 60 void TraceMetadata::purge_all() { 61 assert(SafepointSynchronize::is_at_safepoint() && Thread::current()->is_VM_thread(), "must be done in VM thread at safepoint"); 62 63 MarkKlassUnknownClosure mark_unknown; 64 ClassLoaderDataGraph::classes_do(&mark_unknown); 65 66 _stack_cache->purge_all(); 67 } 68 69 void TraceMetadata::do_maintenance() { 70 assert(SafepointSynchronize::is_at_safepoint() && Thread::current()->is_VM_thread(), "must be done in VM thread at safepoint"); 71 72 if (_stack_cache->has_invalid_stacks()) { 73 ClearInvalidatedMementoStacksClosure clear_invalid; 74 Threads::threads_do(&clear_invalid); 75 } 76 77 _stack_cache->do_maintenance(); 78 assert(!_stack_cache->has_invalid_stacks(), "sanity"); 79 }