1 /*
2 * Copyright (c) 1999, 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 *
183 set_refill_waste_limit(initial_refill_waste_limit());
184 }
185
186 void ThreadLocalAllocBuffer::initialize(HeapWord* start,
187 HeapWord* top,
188 HeapWord* end) {
189 set_start(start);
190 set_top(top);
191 set_pf_top(top);
192 set_end(end);
193 invariants();
194 }
195
196 void ThreadLocalAllocBuffer::initialize() {
197 initialize(NULL, // start
198 NULL, // top
199 NULL); // end
200
201 set_desired_size(initial_desired_size());
202
203 // Following check is needed because at startup the main (primordial)
204 // thread is initialized before the heap is. The initialization for
205 // this thread is redone in startup_initialization below.
206 if (Universe::heap() != NULL) {
207 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize;
208 double alloc_frac = desired_size() * target_refills() / (double) capacity;
209 _allocation_fraction.sample(alloc_frac);
210 }
211
212 set_refill_waste_limit(initial_refill_waste_limit());
213
214 initialize_statistics();
215 }
216
217 void ThreadLocalAllocBuffer::startup_initialization() {
218
219 // Assuming each thread's active tlab is, on average,
220 // 1/2 full at a GC
221 _target_refills = 100 / (2 * TLABWasteTargetPercent);
222 _target_refills = MAX2(_target_refills, (unsigned)1U);
223
224 _global_stats = new GlobalTLABStats();
225
226 // During jvm startup, the main (primordial) thread is initialized
227 // before the heap is initialized. So reinitialize it now.
228 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread");
229 Thread::current()->tlab().initialize();
230
231 if (PrintTLAB && Verbose) {
232 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n",
233 min_size(), Thread::current()->tlab().initial_desired_size(), max_size());
234 }
235 }
236
237 size_t ThreadLocalAllocBuffer::initial_desired_size() {
238 size_t init_sz = 0;
239
240 if (TLABSize > 0) {
241 init_sz = TLABSize / HeapWordSize;
242 } else if (global_stats() != NULL) {
243 // Initial size is a function of the average number of allocating threads.
244 unsigned nof_threads = global_stats()->allocating_threads_avg();
245
246 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) /
|
1 /*
2 * Copyright (c) 1999, 2018, 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 *
183 set_refill_waste_limit(initial_refill_waste_limit());
184 }
185
186 void ThreadLocalAllocBuffer::initialize(HeapWord* start,
187 HeapWord* top,
188 HeapWord* end) {
189 set_start(start);
190 set_top(top);
191 set_pf_top(top);
192 set_end(end);
193 invariants();
194 }
195
196 void ThreadLocalAllocBuffer::initialize() {
197 initialize(NULL, // start
198 NULL, // top
199 NULL); // end
200
201 set_desired_size(initial_desired_size());
202
203 // Following check is needed because at startup the main
204 // thread is initialized before the heap is. The initialization for
205 // this thread is redone in startup_initialization below.
206 if (Universe::heap() != NULL) {
207 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize;
208 double alloc_frac = desired_size() * target_refills() / (double) capacity;
209 _allocation_fraction.sample(alloc_frac);
210 }
211
212 set_refill_waste_limit(initial_refill_waste_limit());
213
214 initialize_statistics();
215 }
216
217 void ThreadLocalAllocBuffer::startup_initialization() {
218
219 // Assuming each thread's active tlab is, on average,
220 // 1/2 full at a GC
221 _target_refills = 100 / (2 * TLABWasteTargetPercent);
222 _target_refills = MAX2(_target_refills, (unsigned)1U);
223
224 _global_stats = new GlobalTLABStats();
225
226 // During jvm startup, the main thread is initialized
227 // before the heap is initialized. So reinitialize it now.
228 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread");
229 Thread::current()->tlab().initialize();
230
231 if (PrintTLAB && Verbose) {
232 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n",
233 min_size(), Thread::current()->tlab().initial_desired_size(), max_size());
234 }
235 }
236
237 size_t ThreadLocalAllocBuffer::initial_desired_size() {
238 size_t init_sz = 0;
239
240 if (TLABSize > 0) {
241 init_sz = TLABSize / HeapWordSize;
242 } else if (global_stats() != NULL) {
243 // Initial size is a function of the average number of allocating threads.
244 unsigned nof_threads = global_stats()->allocating_threads_avg();
245
246 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) /
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