interfaceSupport.cpp revision 6412:53a41e7cbe05
1/* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. 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 "gc_implementation/shared/markSweep.hpp" 27#include "gc_interface/collectedHeap.hpp" 28#include "gc_interface/collectedHeap.inline.hpp" 29#include "memory/genCollectedHeap.hpp" 30#include "memory/resourceArea.hpp" 31#include "runtime/init.hpp" 32#include "runtime/interfaceSupport.hpp" 33#include "runtime/orderAccess.inline.hpp" 34#include "runtime/threadLocalStorage.hpp" 35#include "runtime/vframe.hpp" 36#include "utilities/preserveException.hpp" 37 38PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 39 40// Implementation of InterfaceSupport 41 42#ifdef ASSERT 43 44long InterfaceSupport::_number_of_calls = 0; 45long InterfaceSupport::_scavenge_alot_counter = 1; 46long InterfaceSupport::_fullgc_alot_counter = 1; 47long InterfaceSupport::_fullgc_alot_invocation = 0; 48 49Histogram* RuntimeHistogram; 50 51RuntimeHistogramElement::RuntimeHistogramElement(const char* elementName) { 52 static volatile jint RuntimeHistogram_lock = 0; 53 _name = elementName; 54 uintx count = 0; 55 56 while (Atomic::cmpxchg(1, &RuntimeHistogram_lock, 0) != 0) { 57 while (OrderAccess::load_acquire(&RuntimeHistogram_lock) != 0) { 58 count +=1; 59 if ( (WarnOnStalledSpinLock > 0) 60 && (count % WarnOnStalledSpinLock == 0)) { 61 warning("RuntimeHistogram_lock seems to be stalled"); 62 } 63 } 64 } 65 66 if (RuntimeHistogram == NULL) { 67 RuntimeHistogram = new Histogram("VM Runtime Call Counts",200); 68 } 69 70 RuntimeHistogram->add_element(this); 71 Atomic::dec(&RuntimeHistogram_lock); 72} 73 74void InterfaceSupport::trace(const char* result_type, const char* header) { 75 tty->print_cr("%6d %s", _number_of_calls, header); 76} 77 78void InterfaceSupport::gc_alot() { 79 Thread *thread = Thread::current(); 80 if (!thread->is_Java_thread()) return; // Avoid concurrent calls 81 // Check for new, not quite initialized thread. A thread in new mode cannot initiate a GC. 82 JavaThread *current_thread = (JavaThread *)thread; 83 if (current_thread->active_handles() == NULL) return; 84 85 // Short-circuit any possible re-entrant gc-a-lot attempt 86 if (thread->skip_gcalot()) return; 87 88 if (is_init_completed()) { 89 90 if (++_fullgc_alot_invocation < FullGCALotStart) { 91 return; 92 } 93 94 // Use this line if you want to block at a specific point, 95 // e.g. one number_of_calls/scavenge/gc before you got into problems 96 if (FullGCALot) _fullgc_alot_counter--; 97 98 // Check if we should force a full gc 99 if (_fullgc_alot_counter == 0) { 100 // Release dummy so objects are forced to move 101 if (!Universe::release_fullgc_alot_dummy()) { 102 warning("FullGCALot: Unable to release more dummies at bottom of heap"); 103 } 104 HandleMark hm(thread); 105 Universe::heap()->collect(GCCause::_full_gc_alot); 106 unsigned int invocations = Universe::heap()->total_full_collections(); 107 // Compute new interval 108 if (FullGCALotInterval > 1) { 109 _fullgc_alot_counter = 1+(long)((double)FullGCALotInterval*os::random()/(max_jint+1.0)); 110 if (PrintGCDetails && Verbose) { 111 tty->print_cr("Full gc no: %u\tInterval: %d", invocations, 112 _fullgc_alot_counter); 113 } 114 } else { 115 _fullgc_alot_counter = 1; 116 } 117 // Print progress message 118 if (invocations % 100 == 0) { 119 if (PrintGCDetails && Verbose) tty->print_cr("Full gc no: %u", invocations); 120 } 121 } else { 122 if (ScavengeALot) _scavenge_alot_counter--; 123 // Check if we should force a scavenge 124 if (_scavenge_alot_counter == 0) { 125 HandleMark hm(thread); 126 Universe::heap()->collect(GCCause::_scavenge_alot); 127 unsigned int invocations = Universe::heap()->total_collections() - Universe::heap()->total_full_collections(); 128 // Compute new interval 129 if (ScavengeALotInterval > 1) { 130 _scavenge_alot_counter = 1+(long)((double)ScavengeALotInterval*os::random()/(max_jint+1.0)); 131 if (PrintGCDetails && Verbose) { 132 tty->print_cr("Scavenge no: %u\tInterval: %d", invocations, 133 _scavenge_alot_counter); 134 } 135 } else { 136 _scavenge_alot_counter = 1; 137 } 138 // Print progress message 139 if (invocations % 1000 == 0) { 140 if (PrintGCDetails && Verbose) tty->print_cr("Scavenge no: %u", invocations); 141 } 142 } 143 } 144 } 145} 146 147 148vframe* vframe_array[50]; 149int walk_stack_counter = 0; 150 151void InterfaceSupport::walk_stack_from(vframe* start_vf) { 152 // walk 153 int i = 0; 154 for (vframe* f = start_vf; f; f = f->sender() ) { 155 if (i < 50) vframe_array[i++] = f; 156 } 157} 158 159 160void InterfaceSupport::walk_stack() { 161 JavaThread* thread = JavaThread::current(); 162 walk_stack_counter++; 163 if (!thread->has_last_Java_frame()) return; 164 ResourceMark rm(thread); 165 RegisterMap reg_map(thread); 166 walk_stack_from(thread->last_java_vframe(®_map)); 167} 168 169 170# ifdef ENABLE_ZAP_DEAD_LOCALS 171 172static int zap_traversals = 0; 173 174void InterfaceSupport::zap_dead_locals_old() { 175 JavaThread* thread = JavaThread::current(); 176 if (zap_traversals == -1) // edit constant for debugging 177 warning("I am here"); 178 int zap_frame_count = 0; // count frames to help debugging 179 for (StackFrameStream sfs(thread); !sfs.is_done(); sfs.next()) { 180 sfs.current()->zap_dead_locals(thread, sfs.register_map()); 181 ++zap_frame_count; 182 } 183 ++zap_traversals; 184} 185 186# endif 187 188 189int deoptimizeAllCounter = 0; 190int zombieAllCounter = 0; 191 192 193void InterfaceSupport::zombieAll() { 194 if (is_init_completed() && zombieAllCounter > ZombieALotInterval) { 195 zombieAllCounter = 0; 196 VM_ZombieAll op; 197 VMThread::execute(&op); 198 } else { 199 zombieAllCounter++; 200 } 201} 202 203void InterfaceSupport::unlinkSymbols() { 204 VM_UnlinkSymbols op; 205 VMThread::execute(&op); 206} 207 208void InterfaceSupport::deoptimizeAll() { 209 if (is_init_completed() ) { 210 if (DeoptimizeALot && deoptimizeAllCounter > DeoptimizeALotInterval) { 211 deoptimizeAllCounter = 0; 212 VM_DeoptimizeAll op; 213 VMThread::execute(&op); 214 } else if (DeoptimizeRandom && (deoptimizeAllCounter & 0x1f) == (os::random() & 0x1f)) { 215 VM_DeoptimizeAll op; 216 VMThread::execute(&op); 217 } 218 } 219 deoptimizeAllCounter++; 220} 221 222 223void InterfaceSupport::stress_derived_pointers() { 224#ifdef COMPILER2 225 JavaThread *thread = JavaThread::current(); 226 if (!is_init_completed()) return; 227 ResourceMark rm(thread); 228 bool found = false; 229 for (StackFrameStream sfs(thread); !sfs.is_done() && !found; sfs.next()) { 230 CodeBlob* cb = sfs.current()->cb(); 231 if (cb != NULL && cb->oop_maps() ) { 232 // Find oopmap for current method 233 OopMap* map = cb->oop_map_for_return_address(sfs.current()->pc()); 234 assert(map != NULL, "no oopmap found for pc"); 235 found = map->has_derived_pointer(); 236 } 237 } 238 if (found) { 239 // $$$ Not sure what to do here. 240 /* 241 Scavenge::invoke(0); 242 */ 243 } 244#endif 245} 246 247 248void InterfaceSupport::verify_stack() { 249 JavaThread* thread = JavaThread::current(); 250 ResourceMark rm(thread); 251 // disabled because it throws warnings that oop maps should only be accessed 252 // in VM thread or during debugging 253 254 if (!thread->has_pending_exception()) { 255 // verification does not work if there are pending exceptions 256 StackFrameStream sfs(thread); 257 CodeBlob* cb = sfs.current()->cb(); 258 // In case of exceptions we might not have a runtime_stub on 259 // top of stack, hence, all callee-saved registers are not going 260 // to be setup correctly, hence, we cannot do stack verify 261 if (cb != NULL && !(cb->is_runtime_stub() || cb->is_uncommon_trap_stub())) return; 262 263 for (; !sfs.is_done(); sfs.next()) { 264 sfs.current()->verify(sfs.register_map()); 265 } 266 } 267} 268 269 270void InterfaceSupport::verify_last_frame() { 271 JavaThread* thread = JavaThread::current(); 272 ResourceMark rm(thread); 273 RegisterMap reg_map(thread); 274 frame fr = thread->last_frame(); 275 fr.verify(®_map); 276} 277 278 279#endif // ASSERT 280 281 282void InterfaceSupport_init() { 283#ifdef ASSERT 284 if (ScavengeALot || FullGCALot) { 285 srand(ScavengeALotInterval * FullGCALotInterval); 286 } 287#endif 288} 289