1 /*
2 * Copyright (c) 1999, 2007, 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 class GlobalTLABStats;
26
27 // ThreadLocalAllocBuffer: a descriptor for thread-local storage used by
28 // the threads for allocation.
29 // It is thread-private at any time, but maybe multiplexed over
30 // time across multiple threads. The park()/unpark() pair is
31 // used to make it avaiable for such multiplexing.
32 class ThreadLocalAllocBuffer: public CHeapObj {
33 friend class VMStructs;
34 private:
35 HeapWord* _start; // address of TLAB
36 HeapWord* _top; // address after last allocation
37 HeapWord* _pf_top; // allocation prefetch watermark
38 HeapWord* _end; // allocation end (excluding alignment_reserve)
39 size_t _desired_size; // desired size (including alignment_reserve)
40 size_t _refill_waste_limit; // hold onto tlab if free() is larger than this
41
42 static unsigned _target_refills; // expected number of refills between GCs
43
44 unsigned _number_of_refills;
238 void update_allocation(size_t value) {
239 _total_allocation += value;
240 }
241 void update_gc_waste(size_t value) {
242 _total_gc_waste += value;
243 _max_gc_waste = MAX2(_max_gc_waste, value);
244 }
245 void update_fast_refill_waste(size_t value) {
246 _total_fast_refill_waste += value;
247 _max_fast_refill_waste = MAX2(_max_fast_refill_waste, value);
248 }
249 void update_slow_refill_waste(size_t value) {
250 _total_slow_refill_waste += value;
251 _max_slow_refill_waste = MAX2(_max_slow_refill_waste, value);
252 }
253 void update_slow_allocations(unsigned value) {
254 _total_slow_allocations += value;
255 _max_slow_allocations = MAX2(_max_slow_allocations, value);
256 }
257 };
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1 /*
2 * Copyright (c) 1999, 2010, 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 #ifndef SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_HPP
26 #define SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_HPP
27
28 #include "gc_implementation/shared/gcUtil.hpp"
29 #include "oops/typeArrayOop.hpp"
30 #include "runtime/perfData.hpp"
31
32 class GlobalTLABStats;
33
34 // ThreadLocalAllocBuffer: a descriptor for thread-local storage used by
35 // the threads for allocation.
36 // It is thread-private at any time, but maybe multiplexed over
37 // time across multiple threads. The park()/unpark() pair is
38 // used to make it avaiable for such multiplexing.
39 class ThreadLocalAllocBuffer: public CHeapObj {
40 friend class VMStructs;
41 private:
42 HeapWord* _start; // address of TLAB
43 HeapWord* _top; // address after last allocation
44 HeapWord* _pf_top; // allocation prefetch watermark
45 HeapWord* _end; // allocation end (excluding alignment_reserve)
46 size_t _desired_size; // desired size (including alignment_reserve)
47 size_t _refill_waste_limit; // hold onto tlab if free() is larger than this
48
49 static unsigned _target_refills; // expected number of refills between GCs
50
51 unsigned _number_of_refills;
245 void update_allocation(size_t value) {
246 _total_allocation += value;
247 }
248 void update_gc_waste(size_t value) {
249 _total_gc_waste += value;
250 _max_gc_waste = MAX2(_max_gc_waste, value);
251 }
252 void update_fast_refill_waste(size_t value) {
253 _total_fast_refill_waste += value;
254 _max_fast_refill_waste = MAX2(_max_fast_refill_waste, value);
255 }
256 void update_slow_refill_waste(size_t value) {
257 _total_slow_refill_waste += value;
258 _max_slow_refill_waste = MAX2(_max_slow_refill_waste, value);
259 }
260 void update_slow_allocations(unsigned value) {
261 _total_slow_allocations += value;
262 _max_slow_allocations = MAX2(_max_slow_allocations, value);
263 }
264 };
265
266 #endif // SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_HPP
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