< prev index next >

src/hotspot/share/gc/g1/g1ConcurrentRefine.cpp

Print this page
rev 47675 : [mq]: 8149127-rename-concurrentrefine-a
rev 47676 : imported patch 8149127-rename-concurrentrefine-b
rev 47677 : [mq]: 8149127-rename-concurrentrefine-b-stefanj-review
   1 /*
   2  * Copyright (c) 2001, 2016, 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/g1/concurrentG1Refine.hpp"
  27 #include "gc/g1/concurrentG1RefineThread.hpp"
  28 #include "gc/g1/g1YoungRemSetSamplingThread.hpp"
  29 #include "logging/log.hpp"
  30 #include "runtime/java.hpp"
  31 #include "runtime/thread.hpp"
  32 #include "utilities/debug.hpp"
  33 #include "utilities/globalDefinitions.hpp"
  34 #include "utilities/pair.hpp"
  35 #include <math.h>
  36 
  37 // Arbitrary but large limits, to simplify some of the zone calculations.
  38 // The general idea is to allow expressions like
  39 //   MIN2(x OP y, max_XXX_zone)
  40 // without needing to check for overflow in "x OP y", because the
  41 // ranges for x and y have been restricted.
  42 STATIC_ASSERT(sizeof(LP64_ONLY(jint) NOT_LP64(jshort)) <= (sizeof(size_t)/2));
  43 const size_t max_yellow_zone = LP64_ONLY(max_jint) NOT_LP64(max_jshort);
  44 const size_t max_green_zone = max_yellow_zone / 2;
  45 const size_t max_red_zone = INT_MAX; // For dcqs.set_max_completed_queue.
  46 STATIC_ASSERT(max_yellow_zone <= max_red_zone);
  47 


  80            azc_gyr_yellow, azc_gyr_red);                                \
  81   } while (0)
  82 
  83 // Logging tag sequence for refinement control updates.
  84 #define CTRL_TAGS gc, ergo, refine
  85 
  86 // For logging zone values, ensuring consistency of level and tags.
  87 #define LOG_ZONES(...) log_debug( CTRL_TAGS )(__VA_ARGS__)
  88 
  89 // Package for pair of refinement thread activation and deactivation
  90 // thresholds.  The activation and deactivation levels are resp. the first
  91 // and second values of the pair.
  92 typedef Pair<size_t, size_t> Thresholds;
  93 inline size_t activation_level(const Thresholds& t) { return t.first; }
  94 inline size_t deactivation_level(const Thresholds& t) { return t.second; }
  95 
  96 static Thresholds calc_thresholds(size_t green_zone,
  97                                   size_t yellow_zone,
  98                                   uint worker_i) {
  99   double yellow_size = yellow_zone - green_zone;
 100   double step = yellow_size / ConcurrentG1Refine::thread_num();
 101   if (worker_i == 0) {
 102     // Potentially activate worker 0 more aggressively, to keep
 103     // available buffers near green_zone value.  When yellow_size is
 104     // large we don't want to allow a full step to accumulate before
 105     // doing any processing, as that might lead to significantly more
 106     // than green_zone buffers to be processed by update_rs.
 107     step = MIN2(step, ParallelGCThreads / 2.0);
 108   }
 109   size_t activate_offset = static_cast<size_t>(ceil(step * (worker_i + 1)));
 110   size_t deactivate_offset = static_cast<size_t>(floor(step * worker_i));
 111   return Thresholds(green_zone + activate_offset,
 112                     green_zone + deactivate_offset);
 113 }
 114 
 115 ConcurrentG1Refine::ConcurrentG1Refine(size_t green_zone,
 116                                        size_t yellow_zone,
 117                                        size_t red_zone,
 118                                        size_t min_yellow_zone_size) :
 119   _threads(NULL),
 120   _sample_thread(NULL),
 121   _n_worker_threads(thread_num()),
 122   _green_zone(green_zone),
 123   _yellow_zone(yellow_zone),
 124   _red_zone(red_zone),
 125   _min_yellow_zone_size(min_yellow_zone_size)
 126 {
 127   assert_zone_constraints_gyr(green_zone, yellow_zone, red_zone);
 128 }
 129 
 130 static size_t calc_min_yellow_zone_size() {
 131   size_t step = G1ConcRefinementThresholdStep;
 132   uint n_workers = ConcurrentG1Refine::thread_num();
 133   if ((max_yellow_zone / step) < n_workers) {
 134     return max_yellow_zone;
 135   } else {
 136     return step * n_workers;
 137   }
 138 }
 139 
 140 static size_t calc_init_green_zone() {
 141   size_t green = G1ConcRefinementGreenZone;
 142   if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) {
 143     green = ParallelGCThreads;
 144   }
 145   return MIN2(green, max_green_zone);
 146 }
 147 
 148 static size_t calc_init_yellow_zone(size_t green, size_t min_size) {
 149   size_t config = G1ConcRefinementYellowZone;
 150   size_t size = 0;
 151   if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) {
 152     size = green * 2;
 153   } else if (green < config) {
 154     size = config - green;
 155   }
 156   size = MAX2(size, min_size);
 157   size = MIN2(size, max_yellow_zone);
 158   return MIN2(green + size, max_yellow_zone);
 159 }
 160 
 161 static size_t calc_init_red_zone(size_t green, size_t yellow) {
 162   size_t size = yellow - green;
 163   if (!FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) {
 164     size_t config = G1ConcRefinementRedZone;
 165     if (yellow < config) {
 166       size = MAX2(size, config - yellow);
 167     }
 168   }
 169   return MIN2(yellow + size, max_red_zone);
 170 }
 171 
 172 ConcurrentG1Refine* ConcurrentG1Refine::create(jint* ecode) {
 173   size_t min_yellow_zone_size = calc_min_yellow_zone_size();
 174   size_t green_zone = calc_init_green_zone();
 175   size_t yellow_zone = calc_init_yellow_zone(green_zone, min_yellow_zone_size);
 176   size_t red_zone = calc_init_red_zone(green_zone, yellow_zone);
 177 
 178   LOG_ZONES("Initial Refinement Zones: "
 179             "green: " SIZE_FORMAT ", "
 180             "yellow: " SIZE_FORMAT ", "
 181             "red: " SIZE_FORMAT ", "
 182             "min yellow size: " SIZE_FORMAT,
 183             green_zone, yellow_zone, red_zone, min_yellow_zone_size);
 184 
 185   ConcurrentG1Refine* cg1r = new ConcurrentG1Refine(green_zone,
 186                                                     yellow_zone,
 187                                                     red_zone,
 188                                                     min_yellow_zone_size);
 189 
 190   if (cg1r == NULL) {
 191     *ecode = JNI_ENOMEM;
 192     vm_shutdown_during_initialization("Could not create ConcurrentG1Refine");
 193     return NULL;
 194   }
 195 
 196   cg1r->_threads = NEW_C_HEAP_ARRAY_RETURN_NULL(ConcurrentG1RefineThread*, cg1r->_n_worker_threads, mtGC);
 197   if (cg1r->_threads == NULL) {
 198     *ecode = JNI_ENOMEM;
 199     vm_shutdown_during_initialization("Could not allocate an array for ConcurrentG1RefineThread");
 200     return NULL;
 201   }
 202 
 203   uint worker_id_offset = DirtyCardQueueSet::num_par_ids();
 204 
 205   ConcurrentG1RefineThread *next = NULL;
 206   for (uint i = cg1r->_n_worker_threads - 1; i != UINT_MAX; i--) {
 207     Thresholds thresholds = calc_thresholds(green_zone, yellow_zone, i);
 208     ConcurrentG1RefineThread* t =
 209       new ConcurrentG1RefineThread(cg1r,
 210                                    next,
 211                                    worker_id_offset,
 212                                    i,
 213                                    activation_level(thresholds),
 214                                    deactivation_level(thresholds));
 215     assert(t != NULL, "Conc refine should have been created");
 216     if (t->osthread() == NULL) {
 217       *ecode = JNI_ENOMEM;
 218       vm_shutdown_during_initialization("Could not create ConcurrentG1RefineThread");
 219       return NULL;
 220     }
 221 
 222     assert(t->cg1r() == cg1r, "Conc refine thread should refer to this");
 223     cg1r->_threads[i] = t;
 224     next = t;
 225   }
 226 
 227   cg1r->_sample_thread = new G1YoungRemSetSamplingThread();
 228   if (cg1r->_sample_thread->osthread() == NULL) {
 229     *ecode = JNI_ENOMEM;
 230     vm_shutdown_during_initialization("Could not create G1YoungRemSetSamplingThread");
 231     return NULL;
 232   }
 233 
 234   *ecode = JNI_OK;
 235   return cg1r;
 236 }
 237 
 238 void ConcurrentG1Refine::stop() {
 239   for (uint i = 0; i < _n_worker_threads; i++) {
 240     _threads[i]->stop();
 241   }
 242   _sample_thread->stop();
 243 }
 244 
 245 void ConcurrentG1Refine::update_thread_thresholds() {
 246   for (uint i = 0; i < _n_worker_threads; i++) {
 247     Thresholds thresholds = calc_thresholds(_green_zone, _yellow_zone, i);
 248     _threads[i]->update_thresholds(activation_level(thresholds),
 249                                    deactivation_level(thresholds));
 250   }
 251 }
 252 
 253 ConcurrentG1Refine::~ConcurrentG1Refine() {
 254   for (uint i = 0; i < _n_worker_threads; i++) {
 255     delete _threads[i];
 256   }
 257   FREE_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _threads);
 258 
 259   delete _sample_thread;
 260 }
 261 
 262 void ConcurrentG1Refine::threads_do(ThreadClosure *tc) {
 263   worker_threads_do(tc);
 264   tc->do_thread(_sample_thread);
 265 }
 266 
 267 void ConcurrentG1Refine::worker_threads_do(ThreadClosure * tc) {
 268   for (uint i = 0; i < _n_worker_threads; i++) {
 269     tc->do_thread(_threads[i]);
 270   }
 271 }
 272 
 273 uint ConcurrentG1Refine::thread_num() {
 274   return G1ConcRefinementThreads;
 275 }
 276 
 277 void ConcurrentG1Refine::print_worker_threads_on(outputStream* st) const {
 278   for (uint i = 0; i < _n_worker_threads; ++i) {
 279     _threads[i]->print_on(st);
 280     st->cr();
 281   }
 282   _sample_thread->print_on(st);
 283   st->cr();
 284 }
 285 
 286 static size_t calc_new_green_zone(size_t green,
 287                                   double update_rs_time,
 288                                   size_t update_rs_processed_buffers,
 289                                   double goal_ms) {
 290   // Adjust green zone based on whether we're meeting the time goal.
 291   // Limit to max_green_zone.
 292   const double inc_k = 1.1, dec_k = 0.9;
 293   if (update_rs_time > goal_ms) {
 294     if (green > 0) {
 295       green = static_cast<size_t>(green * dec_k);
 296     }
 297   } else if (update_rs_time < goal_ms &&
 298              update_rs_processed_buffers > green) {
 299     green = static_cast<size_t>(MAX2(green * inc_k, green + 1.0));
 300     green = MIN2(green, max_green_zone);
 301   }
 302   return green;
 303 }
 304 
 305 static size_t calc_new_yellow_zone(size_t green, size_t min_yellow_size) {
 306   size_t size = green * 2;
 307   size = MAX2(size, min_yellow_size);
 308   return MIN2(green + size, max_yellow_zone);
 309 }
 310 
 311 static size_t calc_new_red_zone(size_t green, size_t yellow) {
 312   return MIN2(yellow + (yellow - green), max_red_zone);
 313 }
 314 
 315 void ConcurrentG1Refine::update_zones(double update_rs_time,
 316                                       size_t update_rs_processed_buffers,
 317                                       double goal_ms) {
 318   log_trace( CTRL_TAGS )("Updating Refinement Zones: "
 319                          "update_rs time: %.3fms, "
 320                          "update_rs buffers: " SIZE_FORMAT ", "
 321                          "update_rs goal time: %.3fms",
 322                          update_rs_time,
 323                          update_rs_processed_buffers,
 324                          goal_ms);
 325 
 326   _green_zone = calc_new_green_zone(_green_zone,
 327                                     update_rs_time,
 328                                     update_rs_processed_buffers,
 329                                     goal_ms);
 330   _yellow_zone = calc_new_yellow_zone(_green_zone, _min_yellow_zone_size);
 331   _red_zone = calc_new_red_zone(_green_zone, _yellow_zone);
 332 
 333   assert_zone_constraints_gyr(_green_zone, _yellow_zone, _red_zone);
 334   LOG_ZONES("Updated Refinement Zones: "
 335             "green: " SIZE_FORMAT ", "
 336             "yellow: " SIZE_FORMAT ", "
 337             "red: " SIZE_FORMAT,
 338             _green_zone, _yellow_zone, _red_zone);
 339 }
 340 
 341 void ConcurrentG1Refine::adjust(double update_rs_time,
 342                                 size_t update_rs_processed_buffers,
 343                                 double goal_ms) {
 344   DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
 345 
 346   if (G1UseAdaptiveConcRefinement) {
 347     update_zones(update_rs_time, update_rs_processed_buffers, goal_ms);
 348     update_thread_thresholds();
 349 
 350     // Change the barrier params
 351     if (_n_worker_threads == 0) {
 352       // Disable dcqs notification when there are no threads to notify.
 353       dcqs.set_process_completed_threshold(INT_MAX);
 354     } else {
 355       // Worker 0 is the primary; wakeup is via dcqs notification.
 356       STATIC_ASSERT(max_yellow_zone <= INT_MAX);
 357       size_t activate = _threads[0]->activation_threshold();
 358       dcqs.set_process_completed_threshold((int)activate);
 359     }
 360     dcqs.set_max_completed_queue((int)red_zone());
 361   }
   1 /*
   2  * Copyright (c) 2001, 2017, 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/g1/g1ConcurrentRefine.hpp"
  27 #include "gc/g1/g1ConcurrentRefineThread.hpp"
  28 #include "gc/g1/g1YoungRemSetSamplingThread.hpp"
  29 #include "logging/log.hpp"
  30 #include "runtime/java.hpp"
  31 #include "runtime/thread.hpp"
  32 #include "utilities/debug.hpp"
  33 #include "utilities/globalDefinitions.hpp"
  34 #include "utilities/pair.hpp"
  35 #include <math.h>
  36 
  37 // Arbitrary but large limits, to simplify some of the zone calculations.
  38 // The general idea is to allow expressions like
  39 //   MIN2(x OP y, max_XXX_zone)
  40 // without needing to check for overflow in "x OP y", because the
  41 // ranges for x and y have been restricted.
  42 STATIC_ASSERT(sizeof(LP64_ONLY(jint) NOT_LP64(jshort)) <= (sizeof(size_t)/2));
  43 const size_t max_yellow_zone = LP64_ONLY(max_jint) NOT_LP64(max_jshort);
  44 const size_t max_green_zone = max_yellow_zone / 2;
  45 const size_t max_red_zone = INT_MAX; // For dcqs.set_max_completed_queue.
  46 STATIC_ASSERT(max_yellow_zone <= max_red_zone);
  47 


  80            azc_gyr_yellow, azc_gyr_red);                                \
  81   } while (0)
  82 
  83 // Logging tag sequence for refinement control updates.
  84 #define CTRL_TAGS gc, ergo, refine
  85 
  86 // For logging zone values, ensuring consistency of level and tags.
  87 #define LOG_ZONES(...) log_debug( CTRL_TAGS )(__VA_ARGS__)
  88 
  89 // Package for pair of refinement thread activation and deactivation
  90 // thresholds.  The activation and deactivation levels are resp. the first
  91 // and second values of the pair.
  92 typedef Pair<size_t, size_t> Thresholds;
  93 inline size_t activation_level(const Thresholds& t) { return t.first; }
  94 inline size_t deactivation_level(const Thresholds& t) { return t.second; }
  95 
  96 static Thresholds calc_thresholds(size_t green_zone,
  97                                   size_t yellow_zone,
  98                                   uint worker_i) {
  99   double yellow_size = yellow_zone - green_zone;
 100   double step = yellow_size / G1ConcurrentRefine::thread_num();
 101   if (worker_i == 0) {
 102     // Potentially activate worker 0 more aggressively, to keep
 103     // available buffers near green_zone value.  When yellow_size is
 104     // large we don't want to allow a full step to accumulate before
 105     // doing any processing, as that might lead to significantly more
 106     // than green_zone buffers to be processed by update_rs.
 107     step = MIN2(step, ParallelGCThreads / 2.0);
 108   }
 109   size_t activate_offset = static_cast<size_t>(ceil(step * (worker_i + 1)));
 110   size_t deactivate_offset = static_cast<size_t>(floor(step * worker_i));
 111   return Thresholds(green_zone + activate_offset,
 112                     green_zone + deactivate_offset);
 113 }
 114 
 115 G1ConcurrentRefine::G1ConcurrentRefine(size_t green_zone,
 116                                        size_t yellow_zone,
 117                                        size_t red_zone,
 118                                        size_t min_yellow_zone_size) :
 119   _threads(NULL),
 120   _sample_thread(NULL),
 121   _n_worker_threads(thread_num()),
 122   _green_zone(green_zone),
 123   _yellow_zone(yellow_zone),
 124   _red_zone(red_zone),
 125   _min_yellow_zone_size(min_yellow_zone_size)
 126 {
 127   assert_zone_constraints_gyr(green_zone, yellow_zone, red_zone);
 128 }
 129 
 130 static size_t calc_min_yellow_zone_size() {
 131   size_t step = G1ConcRefinementThresholdStep;
 132   uint n_workers = G1ConcurrentRefine::thread_num();
 133   if ((max_yellow_zone / step) < n_workers) {
 134     return max_yellow_zone;
 135   } else {
 136     return step * n_workers;
 137   }
 138 }
 139 
 140 static size_t calc_init_green_zone() {
 141   size_t green = G1ConcRefinementGreenZone;
 142   if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) {
 143     green = ParallelGCThreads;
 144   }
 145   return MIN2(green, max_green_zone);
 146 }
 147 
 148 static size_t calc_init_yellow_zone(size_t green, size_t min_size) {
 149   size_t config = G1ConcRefinementYellowZone;
 150   size_t size = 0;
 151   if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) {
 152     size = green * 2;
 153   } else if (green < config) {
 154     size = config - green;
 155   }
 156   size = MAX2(size, min_size);
 157   size = MIN2(size, max_yellow_zone);
 158   return MIN2(green + size, max_yellow_zone);
 159 }
 160 
 161 static size_t calc_init_red_zone(size_t green, size_t yellow) {
 162   size_t size = yellow - green;
 163   if (!FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) {
 164     size_t config = G1ConcRefinementRedZone;
 165     if (yellow < config) {
 166       size = MAX2(size, config - yellow);
 167     }
 168   }
 169   return MIN2(yellow + size, max_red_zone);
 170 }
 171 
 172 G1ConcurrentRefine* G1ConcurrentRefine::create(jint* ecode) {
 173   size_t min_yellow_zone_size = calc_min_yellow_zone_size();
 174   size_t green_zone = calc_init_green_zone();
 175   size_t yellow_zone = calc_init_yellow_zone(green_zone, min_yellow_zone_size);
 176   size_t red_zone = calc_init_red_zone(green_zone, yellow_zone);
 177 
 178   LOG_ZONES("Initial Refinement Zones: "
 179             "green: " SIZE_FORMAT ", "
 180             "yellow: " SIZE_FORMAT ", "
 181             "red: " SIZE_FORMAT ", "
 182             "min yellow size: " SIZE_FORMAT,
 183             green_zone, yellow_zone, red_zone, min_yellow_zone_size);
 184 
 185   G1ConcurrentRefine* cr = new G1ConcurrentRefine(green_zone,
 186                                                   yellow_zone,
 187                                                   red_zone,
 188                                                   min_yellow_zone_size);
 189 
 190   if (cr == NULL) {
 191     *ecode = JNI_ENOMEM;
 192     vm_shutdown_during_initialization("Could not create G1ConcurrentRefine");
 193     return NULL;
 194   }
 195 
 196   cr->_threads = NEW_C_HEAP_ARRAY_RETURN_NULL(G1ConcurrentRefineThread*, cr->_n_worker_threads, mtGC);
 197   if (cr->_threads == NULL) {
 198     *ecode = JNI_ENOMEM;
 199     vm_shutdown_during_initialization("Could not allocate an array for G1ConcurrentRefineThread");
 200     return NULL;
 201   }
 202 
 203   uint worker_id_offset = DirtyCardQueueSet::num_par_ids();
 204 
 205   G1ConcurrentRefineThread *next = NULL;
 206   for (uint i = cr->_n_worker_threads - 1; i != UINT_MAX; i--) {
 207     Thresholds thresholds = calc_thresholds(green_zone, yellow_zone, i);
 208     G1ConcurrentRefineThread* t =
 209       new G1ConcurrentRefineThread(cr,
 210                                    next,
 211                                    worker_id_offset,
 212                                    i,
 213                                    activation_level(thresholds),
 214                                    deactivation_level(thresholds));
 215     assert(t != NULL, "Conc refine should have been created");
 216     if (t->osthread() == NULL) {
 217       *ecode = JNI_ENOMEM;
 218       vm_shutdown_during_initialization("Could not create G1ConcurrentRefineThread");
 219       return NULL;
 220     }
 221 
 222     assert(t->cr() == cr, "Conc refine thread should refer to this");
 223     cr->_threads[i] = t;
 224     next = t;
 225   }
 226 
 227   cr->_sample_thread = new G1YoungRemSetSamplingThread();
 228   if (cr->_sample_thread->osthread() == NULL) {
 229     *ecode = JNI_ENOMEM;
 230     vm_shutdown_during_initialization("Could not create G1YoungRemSetSamplingThread");
 231     return NULL;
 232   }
 233 
 234   *ecode = JNI_OK;
 235   return cr;
 236 }
 237 
 238 void G1ConcurrentRefine::stop() {
 239   for (uint i = 0; i < _n_worker_threads; i++) {
 240     _threads[i]->stop();
 241   }
 242   _sample_thread->stop();
 243 }
 244 
 245 void G1ConcurrentRefine::update_thread_thresholds() {
 246   for (uint i = 0; i < _n_worker_threads; i++) {
 247     Thresholds thresholds = calc_thresholds(_green_zone, _yellow_zone, i);
 248     _threads[i]->update_thresholds(activation_level(thresholds),
 249                                    deactivation_level(thresholds));
 250   }
 251 }
 252 
 253 G1ConcurrentRefine::~G1ConcurrentRefine() {
 254   for (uint i = 0; i < _n_worker_threads; i++) {
 255     delete _threads[i];
 256   }
 257   FREE_C_HEAP_ARRAY(G1ConcurrentRefineThread*, _threads);
 258 
 259   delete _sample_thread;
 260 }
 261 
 262 void G1ConcurrentRefine::threads_do(ThreadClosure *tc) {
 263   worker_threads_do(tc);
 264   tc->do_thread(_sample_thread);
 265 }
 266 
 267 void G1ConcurrentRefine::worker_threads_do(ThreadClosure * tc) {
 268   for (uint i = 0; i < _n_worker_threads; i++) {
 269     tc->do_thread(_threads[i]);
 270   }
 271 }
 272 
 273 uint G1ConcurrentRefine::thread_num() {
 274   return G1ConcRefinementThreads;
 275 }
 276 
 277 void G1ConcurrentRefine::print_worker_threads_on(outputStream* st) const {
 278   for (uint i = 0; i < _n_worker_threads; ++i) {
 279     _threads[i]->print_on(st);
 280     st->cr();
 281   }
 282   _sample_thread->print_on(st);
 283   st->cr();
 284 }
 285 
 286 static size_t calc_new_green_zone(size_t green,
 287                                   double update_rs_time,
 288                                   size_t update_rs_processed_buffers,
 289                                   double goal_ms) {
 290   // Adjust green zone based on whether we're meeting the time goal.
 291   // Limit to max_green_zone.
 292   const double inc_k = 1.1, dec_k = 0.9;
 293   if (update_rs_time > goal_ms) {
 294     if (green > 0) {
 295       green = static_cast<size_t>(green * dec_k);
 296     }
 297   } else if (update_rs_time < goal_ms &&
 298              update_rs_processed_buffers > green) {
 299     green = static_cast<size_t>(MAX2(green * inc_k, green + 1.0));
 300     green = MIN2(green, max_green_zone);
 301   }
 302   return green;
 303 }
 304 
 305 static size_t calc_new_yellow_zone(size_t green, size_t min_yellow_size) {
 306   size_t size = green * 2;
 307   size = MAX2(size, min_yellow_size);
 308   return MIN2(green + size, max_yellow_zone);
 309 }
 310 
 311 static size_t calc_new_red_zone(size_t green, size_t yellow) {
 312   return MIN2(yellow + (yellow - green), max_red_zone);
 313 }
 314 
 315 void G1ConcurrentRefine::update_zones(double update_rs_time,
 316                                       size_t update_rs_processed_buffers,
 317                                       double goal_ms) {
 318   log_trace( CTRL_TAGS )("Updating Refinement Zones: "
 319                          "update_rs time: %.3fms, "
 320                          "update_rs buffers: " SIZE_FORMAT ", "
 321                          "update_rs goal time: %.3fms",
 322                          update_rs_time,
 323                          update_rs_processed_buffers,
 324                          goal_ms);
 325 
 326   _green_zone = calc_new_green_zone(_green_zone,
 327                                     update_rs_time,
 328                                     update_rs_processed_buffers,
 329                                     goal_ms);
 330   _yellow_zone = calc_new_yellow_zone(_green_zone, _min_yellow_zone_size);
 331   _red_zone = calc_new_red_zone(_green_zone, _yellow_zone);
 332 
 333   assert_zone_constraints_gyr(_green_zone, _yellow_zone, _red_zone);
 334   LOG_ZONES("Updated Refinement Zones: "
 335             "green: " SIZE_FORMAT ", "
 336             "yellow: " SIZE_FORMAT ", "
 337             "red: " SIZE_FORMAT,
 338             _green_zone, _yellow_zone, _red_zone);
 339 }
 340 
 341 void G1ConcurrentRefine::adjust(double update_rs_time,
 342                                 size_t update_rs_processed_buffers,
 343                                 double goal_ms) {
 344   DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
 345 
 346   if (G1UseAdaptiveConcRefinement) {
 347     update_zones(update_rs_time, update_rs_processed_buffers, goal_ms);
 348     update_thread_thresholds();
 349 
 350     // Change the barrier params
 351     if (_n_worker_threads == 0) {
 352       // Disable dcqs notification when there are no threads to notify.
 353       dcqs.set_process_completed_threshold(INT_MAX);
 354     } else {
 355       // Worker 0 is the primary; wakeup is via dcqs notification.
 356       STATIC_ASSERT(max_yellow_zone <= INT_MAX);
 357       size_t activate = _threads[0]->activation_threshold();
 358       dcqs.set_process_completed_threshold((int)activate);
 359     }
 360     dcqs.set_max_completed_queue((int)red_zone());
 361   }
< prev index next >