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comparison src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp @ 2152:0fa27f37d4d4

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6977804: G1: remove the zero-filling thread Summary: This changeset removes the zero-filling thread from G1 and collapses the two free region lists we had before (the "free" and "unclean" lists) into one. The new free list uses the new heap region sets / lists abstractions that we'll ultimately use it to keep track of all regions in the heap. A heap region set was also introduced for the humongous regions. Finally, this change increases the concurrency between the thread that completes freeing regions (after a cleanup pause) and the rest of the system (before we'd have to wait for said thread to complete before allocating a new region). The changest also includes a lot of refactoring and code simplification. Reviewed-by: jcoomes, johnc
author tonyp
date Wed, 19 Jan 2011 19:30:42 -0500
parents fb712ff22571
children a672e43650cc
comparison
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2151:cb913d743d09 2152:0fa27f37d4d4
1 /* 1 /*
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
93 void ConcurrentMarkThread::run() { 93 void ConcurrentMarkThread::run() {
94 initialize_in_thread(); 94 initialize_in_thread();
95 _vtime_start = os::elapsedVTime(); 95 _vtime_start = os::elapsedVTime();
96 wait_for_universe_init(); 96 wait_for_universe_init();
97 97
98 G1CollectedHeap* g1 = G1CollectedHeap::heap(); 98 G1CollectedHeap* g1h = G1CollectedHeap::heap();
99 G1CollectorPolicy* g1_policy = g1->g1_policy(); 99 G1CollectorPolicy* g1_policy = g1h->g1_policy();
100 G1MMUTracker *mmu_tracker = g1_policy->mmu_tracker(); 100 G1MMUTracker *mmu_tracker = g1_policy->mmu_tracker();
101 Thread *current_thread = Thread::current(); 101 Thread *current_thread = Thread::current();
102 102
103 while (!_should_terminate) { 103 while (!_should_terminate) {
104 // wait until started is set. 104 // wait until started is set.
117 } 117 }
118 118
119 if (!g1_policy->in_young_gc_mode()) { 119 if (!g1_policy->in_young_gc_mode()) {
120 // this ensures the flag is not set if we bail out of the marking 120 // this ensures the flag is not set if we bail out of the marking
121 // cycle; normally the flag is cleared immediately after cleanup 121 // cycle; normally the flag is cleared immediately after cleanup
122 g1->set_marking_complete(); 122 g1h->set_marking_complete();
123 123
124 if (g1_policy->adaptive_young_list_length()) { 124 if (g1_policy->adaptive_young_list_length()) {
125 double now = os::elapsedTime(); 125 double now = os::elapsedTime();
126 double init_prediction_ms = g1_policy->predict_init_time_ms(); 126 double init_prediction_ms = g1_policy->predict_init_time_ms();
127 jlong sleep_time_ms = mmu_tracker->when_ms(now, init_prediction_ms); 127 jlong sleep_time_ms = mmu_tracker->when_ms(now, init_prediction_ms);
226 CMCleanUp cl_cl(_cm); 226 CMCleanUp cl_cl(_cm);
227 sprintf(verbose_str, "GC cleanup"); 227 sprintf(verbose_str, "GC cleanup");
228 VM_CGC_Operation op(&cl_cl, verbose_str); 228 VM_CGC_Operation op(&cl_cl, verbose_str);
229 VMThread::execute(&op); 229 VMThread::execute(&op);
230 } else { 230 } else {
231 G1CollectedHeap::heap()->set_marking_complete(); 231 g1h->set_marking_complete();
232 } 232 }
233 233
234 if (!cm()->has_aborted()) { 234 // Check if cleanup set the free_regions_coming flag. If it
235 // hasn't, we can just skip the next step.
236 if (g1h->free_regions_coming()) {
237 // The following will finish freeing up any regions that we
238 // found to be empty during cleanup. We'll do this part
239 // without joining the suspendible set. If an evacuation pause
240 // takes places, then we would carry on freeing regions in
241 // case they are needed by the pause. If a Full GC takes
242 // places, it would wait for us to process the regions
243 // reclaimed by cleanup.
244
235 double cleanup_start_sec = os::elapsedTime(); 245 double cleanup_start_sec = os::elapsedTime();
236 if (PrintGC) { 246 if (PrintGC) {
237 gclog_or_tty->date_stamp(PrintGCDateStamps); 247 gclog_or_tty->date_stamp(PrintGCDateStamps);
238 gclog_or_tty->stamp(PrintGCTimeStamps); 248 gclog_or_tty->stamp(PrintGCTimeStamps);
239 gclog_or_tty->print_cr("[GC concurrent-cleanup-start]"); 249 gclog_or_tty->print_cr("[GC concurrent-cleanup-start]");
240 } 250 }
241 251
242 // Now do the remainder of the cleanup operation. 252 // Now do the remainder of the cleanup operation.
243 _sts.join();
244 _cm->completeCleanup(); 253 _cm->completeCleanup();
245 if (!cm()->has_aborted()) { 254 g1_policy->record_concurrent_mark_cleanup_completed();
246 g1_policy->record_concurrent_mark_cleanup_completed(); 255
247 256 double cleanup_end_sec = os::elapsedTime();
248 double cleanup_end_sec = os::elapsedTime(); 257 if (PrintGC) {
249 if (PrintGC) { 258 gclog_or_tty->date_stamp(PrintGCDateStamps);
250 gclog_or_tty->date_stamp(PrintGCDateStamps); 259 gclog_or_tty->stamp(PrintGCTimeStamps);
251 gclog_or_tty->stamp(PrintGCTimeStamps); 260 gclog_or_tty->print_cr("[GC concurrent-cleanup-end, %1.7lf]",
252 gclog_or_tty->print_cr("[GC concurrent-cleanup-end, %1.7lf]", 261 cleanup_end_sec - cleanup_start_sec);
253 cleanup_end_sec - cleanup_start_sec); 262 }
254 } 263
255 } 264 // We're done: no more free regions coming.
256 _sts.leave(); 265 g1h->reset_free_regions_coming();
257 } 266 }
258 // We're done: no more unclean regions coming. 267 guarantee(cm()->cleanup_list_is_empty(),
259 G1CollectedHeap::heap()->set_unclean_regions_coming(false); 268 "at this point there should be no regions on the cleanup list");
260 269
261 if (cm()->has_aborted()) { 270 if (cm()->has_aborted()) {
262 if (PrintGC) { 271 if (PrintGC) {
263 gclog_or_tty->date_stamp(PrintGCDateStamps); 272 gclog_or_tty->date_stamp(PrintGCDateStamps);
264 gclog_or_tty->stamp(PrintGCTimeStamps); 273 gclog_or_tty->stamp(PrintGCTimeStamps);
276 // Update the number of full collections that have been 285 // Update the number of full collections that have been
277 // completed. This will also notify the FullGCCount_lock in case a 286 // completed. This will also notify the FullGCCount_lock in case a
278 // Java thread is waiting for a full GC to happen (e.g., it 287 // Java thread is waiting for a full GC to happen (e.g., it
279 // called System.gc() with +ExplicitGCInvokesConcurrent). 288 // called System.gc() with +ExplicitGCInvokesConcurrent).
280 _sts.join(); 289 _sts.join();
281 g1->increment_full_collections_completed(true /* concurrent */); 290 g1h->increment_full_collections_completed(true /* concurrent */);
282 _sts.leave(); 291 _sts.leave();
283 } 292 }
284 assert(_should_terminate, "just checking"); 293 assert(_should_terminate, "just checking");
285 294
286 terminate(); 295 terminate();