1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/parallelScavenge/pcTasks.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,378 @@
1.4 +/*
1.5 + * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "classfile/systemDictionary.hpp"
1.30 +#include "code/codeCache.hpp"
1.31 +#include "gc_implementation/parallelScavenge/pcTasks.hpp"
1.32 +#include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
1.33 +#include "gc_implementation/shared/gcTimer.hpp"
1.34 +#include "gc_implementation/shared/gcTraceTime.hpp"
1.35 +#include "gc_interface/collectedHeap.hpp"
1.36 +#include "memory/universe.hpp"
1.37 +#include "oops/objArrayKlass.inline.hpp"
1.38 +#include "oops/oop.inline.hpp"
1.39 +#include "oops/oop.pcgc.inline.hpp"
1.40 +#include "prims/jvmtiExport.hpp"
1.41 +#include "runtime/fprofiler.hpp"
1.42 +#include "runtime/jniHandles.hpp"
1.43 +#include "runtime/thread.hpp"
1.44 +#include "runtime/vmThread.hpp"
1.45 +#include "services/management.hpp"
1.46 +
1.47 +PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
1.48 +
1.49 +//
1.50 +// ThreadRootsMarkingTask
1.51 +//
1.52 +
1.53 +void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
1.54 + assert(Universe::heap()->is_gc_active(), "called outside gc");
1.55 +
1.56 + ResourceMark rm;
1.57 +
1.58 + NOT_PRODUCT(GCTraceTime tm("ThreadRootsMarkingTask",
1.59 + PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
1.60 + ParCompactionManager* cm =
1.61 + ParCompactionManager::gc_thread_compaction_manager(which);
1.62 +
1.63 + PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
1.64 + CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true);
1.65 + CodeBlobToOopClosure mark_and_push_in_blobs(&mark_and_push_closure, /*do_marking=*/ true);
1.66 +
1.67 + if (_java_thread != NULL)
1.68 + _java_thread->oops_do(
1.69 + &mark_and_push_closure,
1.70 + &mark_and_push_from_clds,
1.71 + &mark_and_push_in_blobs);
1.72 +
1.73 + if (_vm_thread != NULL)
1.74 + _vm_thread->oops_do(
1.75 + &mark_and_push_closure,
1.76 + &mark_and_push_from_clds,
1.77 + &mark_and_push_in_blobs);
1.78 +
1.79 + // Do the real work
1.80 + cm->follow_marking_stacks();
1.81 +}
1.82 +
1.83 +
1.84 +void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
1.85 + assert(Universe::heap()->is_gc_active(), "called outside gc");
1.86 +
1.87 + NOT_PRODUCT(GCTraceTime tm("MarkFromRootsTask",
1.88 + PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
1.89 + ParCompactionManager* cm =
1.90 + ParCompactionManager::gc_thread_compaction_manager(which);
1.91 + PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
1.92 + PSParallelCompact::FollowKlassClosure follow_klass_closure(&mark_and_push_closure);
1.93 +
1.94 + switch (_root_type) {
1.95 + case universe:
1.96 + Universe::oops_do(&mark_and_push_closure);
1.97 + break;
1.98 +
1.99 + case jni_handles:
1.100 + JNIHandles::oops_do(&mark_and_push_closure);
1.101 + break;
1.102 +
1.103 + case threads:
1.104 + {
1.105 + ResourceMark rm;
1.106 + CodeBlobToOopClosure each_active_code_blob(&mark_and_push_closure, /*do_marking=*/ true);
1.107 + CLDToOopClosure mark_and_push_from_cld(&mark_and_push_closure);
1.108 + Threads::oops_do(&mark_and_push_closure, &mark_and_push_from_cld, &each_active_code_blob);
1.109 + }
1.110 + break;
1.111 +
1.112 + case object_synchronizer:
1.113 + ObjectSynchronizer::oops_do(&mark_and_push_closure);
1.114 + break;
1.115 +
1.116 + case flat_profiler:
1.117 + FlatProfiler::oops_do(&mark_and_push_closure);
1.118 + break;
1.119 +
1.120 + case management:
1.121 + Management::oops_do(&mark_and_push_closure);
1.122 + break;
1.123 +
1.124 + case jvmti:
1.125 + JvmtiExport::oops_do(&mark_and_push_closure);
1.126 + break;
1.127 +
1.128 + case system_dictionary:
1.129 + SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
1.130 + break;
1.131 +
1.132 + case class_loader_data:
1.133 + ClassLoaderDataGraph::always_strong_oops_do(&mark_and_push_closure, &follow_klass_closure, true);
1.134 + break;
1.135 +
1.136 + case code_cache:
1.137 + // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
1.138 + //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
1.139 + break;
1.140 +
1.141 + default:
1.142 + fatal("Unknown root type");
1.143 + }
1.144 +
1.145 + // Do the real work
1.146 + cm->follow_marking_stacks();
1.147 +}
1.148 +
1.149 +
1.150 +//
1.151 +// RefProcTaskProxy
1.152 +//
1.153 +
1.154 +void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
1.155 +{
1.156 + assert(Universe::heap()->is_gc_active(), "called outside gc");
1.157 +
1.158 + NOT_PRODUCT(GCTraceTime tm("RefProcTask",
1.159 + PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
1.160 + ParCompactionManager* cm =
1.161 + ParCompactionManager::gc_thread_compaction_manager(which);
1.162 + PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
1.163 + PSParallelCompact::FollowStackClosure follow_stack_closure(cm);
1.164 + _rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
1.165 + mark_and_push_closure, follow_stack_closure);
1.166 +}
1.167 +
1.168 +//
1.169 +// RefProcTaskExecutor
1.170 +//
1.171 +
1.172 +void RefProcTaskExecutor::execute(ProcessTask& task)
1.173 +{
1.174 + ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
1.175 + uint parallel_gc_threads = heap->gc_task_manager()->workers();
1.176 + uint active_gc_threads = heap->gc_task_manager()->active_workers();
1.177 + RegionTaskQueueSet* qset = ParCompactionManager::region_array();
1.178 + ParallelTaskTerminator terminator(active_gc_threads, qset);
1.179 + GCTaskQueue* q = GCTaskQueue::create();
1.180 + for(uint i=0; i<parallel_gc_threads; i++) {
1.181 + q->enqueue(new RefProcTaskProxy(task, i));
1.182 + }
1.183 + if (task.marks_oops_alive()) {
1.184 + if (parallel_gc_threads>1) {
1.185 + for (uint j=0; j<active_gc_threads; j++) {
1.186 + q->enqueue(new StealMarkingTask(&terminator));
1.187 + }
1.188 + }
1.189 + }
1.190 + PSParallelCompact::gc_task_manager()->execute_and_wait(q);
1.191 +}
1.192 +
1.193 +void RefProcTaskExecutor::execute(EnqueueTask& task)
1.194 +{
1.195 + ParallelScavengeHeap* heap = PSParallelCompact::gc_heap();
1.196 + uint parallel_gc_threads = heap->gc_task_manager()->workers();
1.197 + GCTaskQueue* q = GCTaskQueue::create();
1.198 + for(uint i=0; i<parallel_gc_threads; i++) {
1.199 + q->enqueue(new RefEnqueueTaskProxy(task, i));
1.200 + }
1.201 + PSParallelCompact::gc_task_manager()->execute_and_wait(q);
1.202 +}
1.203 +
1.204 +//
1.205 +// StealMarkingTask
1.206 +//
1.207 +
1.208 +StealMarkingTask::StealMarkingTask(ParallelTaskTerminator* t) :
1.209 + _terminator(t) {}
1.210 +
1.211 +void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
1.212 + assert(Universe::heap()->is_gc_active(), "called outside gc");
1.213 +
1.214 + NOT_PRODUCT(GCTraceTime tm("StealMarkingTask",
1.215 + PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
1.216 +
1.217 + ParCompactionManager* cm =
1.218 + ParCompactionManager::gc_thread_compaction_manager(which);
1.219 + PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
1.220 +
1.221 + oop obj = NULL;
1.222 + ObjArrayTask task;
1.223 + int random_seed = 17;
1.224 + do {
1.225 + while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
1.226 + ObjArrayKlass* k = (ObjArrayKlass*)task.obj()->klass();
1.227 + k->oop_follow_contents(cm, task.obj(), task.index());
1.228 + cm->follow_marking_stacks();
1.229 + }
1.230 + while (ParCompactionManager::steal(which, &random_seed, obj)) {
1.231 + obj->follow_contents(cm);
1.232 + cm->follow_marking_stacks();
1.233 + }
1.234 + } while (!terminator()->offer_termination());
1.235 +}
1.236 +
1.237 +//
1.238 +// StealRegionCompactionTask
1.239 +//
1.240 +
1.241 +StealRegionCompactionTask::StealRegionCompactionTask(ParallelTaskTerminator* t):
1.242 + _terminator(t) {}
1.243 +
1.244 +void StealRegionCompactionTask::do_it(GCTaskManager* manager, uint which) {
1.245 + assert(Universe::heap()->is_gc_active(), "called outside gc");
1.246 +
1.247 + NOT_PRODUCT(GCTraceTime tm("StealRegionCompactionTask",
1.248 + PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
1.249 +
1.250 + ParCompactionManager* cm =
1.251 + ParCompactionManager::gc_thread_compaction_manager(which);
1.252 +
1.253 +
1.254 + // If not all threads are active, get a draining stack
1.255 + // from the list. Else, just use this threads draining stack.
1.256 + uint which_stack_index;
1.257 + bool use_all_workers = manager->all_workers_active();
1.258 + if (use_all_workers) {
1.259 + which_stack_index = which;
1.260 + assert(manager->active_workers() == ParallelGCThreads,
1.261 + err_msg("all_workers_active has been incorrectly set: "
1.262 + " active %d ParallelGCThreads %d", manager->active_workers(),
1.263 + ParallelGCThreads));
1.264 + } else {
1.265 + which_stack_index = ParCompactionManager::pop_recycled_stack_index();
1.266 + }
1.267 +
1.268 + cm->set_region_stack_index(which_stack_index);
1.269 + cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
1.270 + if (TraceDynamicGCThreads) {
1.271 + gclog_or_tty->print_cr("StealRegionCompactionTask::do_it "
1.272 + "region_stack_index %d region_stack = 0x%x "
1.273 + " empty (%d) use all workers %d",
1.274 + which_stack_index, ParCompactionManager::region_list(which_stack_index),
1.275 + cm->region_stack()->is_empty(),
1.276 + use_all_workers);
1.277 + }
1.278 +
1.279 + // Has to drain stacks first because there may be regions on
1.280 + // preloaded onto the stack and this thread may never have
1.281 + // done a draining task. Are the draining tasks needed?
1.282 +
1.283 + cm->drain_region_stacks();
1.284 +
1.285 + size_t region_index = 0;
1.286 + int random_seed = 17;
1.287 +
1.288 + // If we're the termination task, try 10 rounds of stealing before
1.289 + // setting the termination flag
1.290 +
1.291 + while(true) {
1.292 + if (ParCompactionManager::steal(which, &random_seed, region_index)) {
1.293 + PSParallelCompact::fill_and_update_region(cm, region_index);
1.294 + cm->drain_region_stacks();
1.295 + } else {
1.296 + if (terminator()->offer_termination()) {
1.297 + break;
1.298 + }
1.299 + // Go around again.
1.300 + }
1.301 + }
1.302 + return;
1.303 +}
1.304 +
1.305 +UpdateDensePrefixTask::UpdateDensePrefixTask(
1.306 + PSParallelCompact::SpaceId space_id,
1.307 + size_t region_index_start,
1.308 + size_t region_index_end) :
1.309 + _space_id(space_id), _region_index_start(region_index_start),
1.310 + _region_index_end(region_index_end) {}
1.311 +
1.312 +void UpdateDensePrefixTask::do_it(GCTaskManager* manager, uint which) {
1.313 +
1.314 + NOT_PRODUCT(GCTraceTime tm("UpdateDensePrefixTask",
1.315 + PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
1.316 +
1.317 + ParCompactionManager* cm =
1.318 + ParCompactionManager::gc_thread_compaction_manager(which);
1.319 +
1.320 + PSParallelCompact::update_and_deadwood_in_dense_prefix(cm,
1.321 + _space_id,
1.322 + _region_index_start,
1.323 + _region_index_end);
1.324 +}
1.325 +
1.326 +void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
1.327 + assert(Universe::heap()->is_gc_active(), "called outside gc");
1.328 +
1.329 + NOT_PRODUCT(GCTraceTime tm("DrainStacksCompactionTask",
1.330 + PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
1.331 +
1.332 + ParCompactionManager* cm =
1.333 + ParCompactionManager::gc_thread_compaction_manager(which);
1.334 +
1.335 + uint which_stack_index;
1.336 + bool use_all_workers = manager->all_workers_active();
1.337 + if (use_all_workers) {
1.338 + which_stack_index = which;
1.339 + assert(manager->active_workers() == ParallelGCThreads,
1.340 + err_msg("all_workers_active has been incorrectly set: "
1.341 + " active %d ParallelGCThreads %d", manager->active_workers(),
1.342 + ParallelGCThreads));
1.343 + } else {
1.344 + which_stack_index = stack_index();
1.345 + }
1.346 +
1.347 + cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
1.348 + if (TraceDynamicGCThreads) {
1.349 + gclog_or_tty->print_cr("DrainStacksCompactionTask::do_it which = %d "
1.350 + "which_stack_index = %d/empty(%d) "
1.351 + "use all workers %d",
1.352 + which, which_stack_index,
1.353 + cm->region_stack()->is_empty(),
1.354 + use_all_workers);
1.355 + }
1.356 +
1.357 + cm->set_region_stack_index(which_stack_index);
1.358 +
1.359 + // Process any regions already in the compaction managers stacks.
1.360 + cm->drain_region_stacks();
1.361 +
1.362 + assert(cm->region_stack()->is_empty(), "Not empty");
1.363 +
1.364 + if (!use_all_workers) {
1.365 + // Always give up the region stack.
1.366 + assert(cm->region_stack() ==
1.367 + ParCompactionManager::region_list(cm->region_stack_index()),
1.368 + "region_stack and region_stack_index are inconsistent");
1.369 + ParCompactionManager::push_recycled_stack_index(cm->region_stack_index());
1.370 +
1.371 + if (TraceDynamicGCThreads) {
1.372 + void* old_region_stack = (void*) cm->region_stack();
1.373 + int old_region_stack_index = cm->region_stack_index();
1.374 + gclog_or_tty->print_cr("Pushing region stack 0x%x/%d",
1.375 + old_region_stack, old_region_stack_index);
1.376 + }
1.377 +
1.378 + cm->set_region_stack(NULL);
1.379 + cm->set_region_stack_index((uint)max_uintx);
1.380 + }
1.381 +}
