1 /* 2 * Copyright (c) 2017, Red Hat Inc. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "runtime/highLatencyKiller.hpp" 27 #include "runtime/task.hpp" 28 #include "runtime/safepoint.hpp" 29 30 // PeriodicTasks do not participate in safepoint protocol, and therefore 31 // can fire when application threads are stopped. This task samples the 32 // time spent in a single safepoint, and aborts VM if timeout was reached. 33 class HighLatencyKillerTask : public PeriodicTask { 34 public: 35 HighLatencyKillerTask(size_t interval_time) : 36 PeriodicTask(interval_time), _last_safepoint(-1), _first_time(0), _last_time(0) {} 37 38 jlong _first_time; 39 jlong _last_time; 40 int _last_safepoint; 41 42 virtual void task() { 43 if (SafepointSynchronize::is_synchronizing() || 44 SafepointSynchronize::is_at_safepoint()) { 45 jlong ct = os::javaTimeMillis(); 46 47 // TODO: Make sure this operation is safe without acquiring Thread_lock 48 int current = SafepointSynchronize::safepoint_counter(); 49 if (current == _last_safepoint) { 50 _last_time = ct; 51 52 size_t delay = (size_t)(_last_time - _first_time); 53 if (delay > HighLatencyKillerTimeout) { 54 // TODO: Print VM operation in progress 55 report_fatal("", -1, "High Latency detected: " SIZE_FORMAT " ms (actual) > " SIZE_FORMAT " ms (threshold). Killing VM.", 56 delay, HighLatencyKillerTimeout); 57 } 58 } else { 59 _first_time = ct; 60 _last_time = ct; 61 _last_safepoint = current; 62 } 63 } 64 } 65 }; 66 67 HighLatencyKiller::HighLatencyKiller() { 68 // TODO: Handle HighLatencyKillerPeriod > HighLatencyKillerTimeout 69 HighLatencyKillerTask* task = new HighLatencyKillerTask(HighLatencyKillerPeriod); 70 task->enroll(); 71 } 72 73 void HighLatencyKiller::create() { 74 _killer = new HighLatencyKiller(); 75 }; 76 77 // TODO: Destructors and proper cleanup 78 79 HighLatencyKiller *HighLatencyKiller::_killer = NULL; 80