1 /*
2 * Copyright (c) 2011, 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 *
23 */
24
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_HPP
27
28 #include "gc_implementation/g1/heapRegion.hpp"
29
30 class G1CollectedHeap;
31
32 // 0 -> no tracing, 1 -> basic tracing, 2 -> basic + allocation tracing
33 #define G1_ALLOC_REGION_TRACING 0
34
35 class ar_ext_msg;
36
37 // A class that holds a region that is active in satisfying allocation
38 // requests, potentially issued in parallel. When the active region is
39 // full it will be retired and replaced with a new one. The
40 // implementation assumes that fast-path allocations will be lock-free
41 // and a lock will need to be taken when the active region needs to be
42 // replaced.
43
44 class G1AllocRegion VALUE_OBJ_CLASS_SPEC {
45 friend class ar_ext_msg;
46
47 private:
48 // The active allocating region we are currently allocating out
216 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes);
217 public:
218 OldGCAllocRegion()
219 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { }
220
221 // This specialization of release() makes sure that the last card that has
222 // been allocated into has been completely filled by a dummy object. This
223 // avoids races when remembered set scanning wants to update the BOT of the
224 // last card in the retained old gc alloc region, and allocation threads
225 // allocating into that card at the same time.
226 virtual HeapRegion* release();
227 };
228
229 class ar_ext_msg : public err_msg {
230 public:
231 ar_ext_msg(G1AllocRegion* alloc_region, const char *message) : err_msg("%s", "") {
232 alloc_region->fill_in_ext_msg(this, message);
233 }
234 };
235
236 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_HPP
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1 /*
2 * Copyright (c) 2011, 2015, 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_GC_G1_G1ALLOCREGION_HPP
26 #define SHARE_VM_GC_G1_G1ALLOCREGION_HPP
27
28 #include "gc/g1/heapRegion.hpp"
29
30 class G1CollectedHeap;
31
32 // 0 -> no tracing, 1 -> basic tracing, 2 -> basic + allocation tracing
33 #define G1_ALLOC_REGION_TRACING 0
34
35 class ar_ext_msg;
36
37 // A class that holds a region that is active in satisfying allocation
38 // requests, potentially issued in parallel. When the active region is
39 // full it will be retired and replaced with a new one. The
40 // implementation assumes that fast-path allocations will be lock-free
41 // and a lock will need to be taken when the active region needs to be
42 // replaced.
43
44 class G1AllocRegion VALUE_OBJ_CLASS_SPEC {
45 friend class ar_ext_msg;
46
47 private:
48 // The active allocating region we are currently allocating out
216 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes);
217 public:
218 OldGCAllocRegion()
219 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { }
220
221 // This specialization of release() makes sure that the last card that has
222 // been allocated into has been completely filled by a dummy object. This
223 // avoids races when remembered set scanning wants to update the BOT of the
224 // last card in the retained old gc alloc region, and allocation threads
225 // allocating into that card at the same time.
226 virtual HeapRegion* release();
227 };
228
229 class ar_ext_msg : public err_msg {
230 public:
231 ar_ext_msg(G1AllocRegion* alloc_region, const char *message) : err_msg("%s", "") {
232 alloc_region->fill_in_ext_msg(this, message);
233 }
234 };
235
236 #endif // SHARE_VM_GC_G1_G1ALLOCREGION_HPP
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