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
88 static HeapRegion* _dummy_region;
89
90 // Some of the methods below take a bot_updates parameter. Its value
91 // should be the same as the _bot_updates field. The idea is that
92 // the parameter will be a constant for a particular alloc region
93 // and, given that these methods will be hopefully inlined, the
94 // compiler should compile out the test.
95
96 // Perform a non-MT-safe allocation out of the given region.
97 static inline HeapWord* allocate(HeapRegion* alloc_region,
98 size_t word_size,
99 bool bot_updates);
100
101 // Perform a MT-safe allocation out of the given region.
102 static inline HeapWord* par_allocate(HeapRegion* alloc_region,
103 size_t word_size,
104 bool bot_updates);
105
106 // Ensure that the region passed as a parameter has been filled up
107 // so that noone else can allocate out of it any more.
108 static void fill_up_remaining_space(HeapRegion* alloc_region,
109 bool bot_updates);
110
111 // Retire the active allocating region. If fill_up is true then make
112 // sure that the region is full before we retire it so that noone
113 // else can allocate out of it.
114 void retire(bool fill_up);
115
116 // After a region is allocated by alloc_new_region, this
117 // method is used to set it as the active alloc_region
118 void update_alloc_region(HeapRegion* alloc_region);
119
120 // Allocate a new active region and use it to perform a word_size
121 // allocation. The force parameter will be passed on to
122 // G1CollectedHeap::allocate_new_alloc_region() and tells it to try
123 // to allocate a new region even if the max has been reached.
124 HeapWord* new_alloc_region_and_allocate(size_t word_size, bool force);
125
126 void fill_in_ext_msg(ar_ext_msg* msg, const char* message);
127
128 protected:
129 // For convenience as subclasses use it.
130 static G1CollectedHeap* _g1h;
131
132 virtual HeapRegion* allocate_new_region(size_t word_size, bool force) = 0;
133 virtual void retire_region(HeapRegion* alloc_region,
134 size_t allocated_bytes) = 0;
135
136 G1AllocRegion(const char* name, bool bot_updates);
137
138 public:
139 static void setup(G1CollectedHeap* g1h, HeapRegion* dummy_region);
140
141 HeapRegion* get() const {
142 HeapRegion * hr = _alloc_region;
143 // Make sure that the dummy region does not escape this class.
144 return (hr == _dummy_region) ? NULL : hr;
145 }
146
147 void set_allocation_context(AllocationContext_t context) { _allocation_context = context; }
148 AllocationContext_t allocation_context() { return _allocation_context; }
184 // Should be called when we want to release the active region which
185 // is returned after it's been retired.
186 virtual HeapRegion* release();
187
188 #if G1_ALLOC_REGION_TRACING
189 void trace(const char* str, size_t word_size = 0, HeapWord* result = NULL);
190 #else // G1_ALLOC_REGION_TRACING
191 void trace(const char* str, size_t word_size = 0, HeapWord* result = NULL) { }
192 #endif // G1_ALLOC_REGION_TRACING
193 };
194
195 class MutatorAllocRegion : public G1AllocRegion {
196 protected:
197 virtual HeapRegion* allocate_new_region(size_t word_size, bool force);
198 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes);
199 public:
200 MutatorAllocRegion()
201 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { }
202 };
203
204 class SurvivorGCAllocRegion : public G1AllocRegion {
205 protected:
206 virtual HeapRegion* allocate_new_region(size_t word_size, bool force);
207 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes);
208 public:
209 SurvivorGCAllocRegion()
210 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { }
211 };
212
213 class OldGCAllocRegion : public G1AllocRegion {
214 protected:
215 virtual HeapRegion* allocate_new_region(size_t word_size, bool force);
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
|
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 #include "gc/g1/g1EvacStats.hpp"
30 #include "gc/g1/g1InCSetState.hpp"
31
32 class G1CollectedHeap;
33
34 // 0 -> no tracing, 1 -> basic tracing, 2 -> basic + allocation tracing
35 #define G1_ALLOC_REGION_TRACING 0
36
37 class ar_ext_msg;
38
39 // A class that holds a region that is active in satisfying allocation
40 // requests, potentially issued in parallel. When the active region is
41 // full it will be retired and replaced with a new one. The
42 // implementation assumes that fast-path allocations will be lock-free
43 // and a lock will need to be taken when the active region needs to be
44 // replaced.
45
46 class G1AllocRegion VALUE_OBJ_CLASS_SPEC {
47 friend class ar_ext_msg;
48
49 private:
50 // The active allocating region we are currently allocating out
90 static HeapRegion* _dummy_region;
91
92 // Some of the methods below take a bot_updates parameter. Its value
93 // should be the same as the _bot_updates field. The idea is that
94 // the parameter will be a constant for a particular alloc region
95 // and, given that these methods will be hopefully inlined, the
96 // compiler should compile out the test.
97
98 // Perform a non-MT-safe allocation out of the given region.
99 static inline HeapWord* allocate(HeapRegion* alloc_region,
100 size_t word_size,
101 bool bot_updates);
102
103 // Perform a MT-safe allocation out of the given region.
104 static inline HeapWord* par_allocate(HeapRegion* alloc_region,
105 size_t word_size,
106 bool bot_updates);
107
108 // Ensure that the region passed as a parameter has been filled up
109 // so that noone else can allocate out of it any more.
110 // Returns the number of bytes that have been wasted by filled up
111 // the space.
112 static size_t fill_up_remaining_space(HeapRegion* alloc_region,
113 bool bot_updates);
114
115 // After a region is allocated by alloc_new_region, this
116 // method is used to set it as the active alloc_region
117 void update_alloc_region(HeapRegion* alloc_region);
118
119 // Allocate a new active region and use it to perform a word_size
120 // allocation. The force parameter will be passed on to
121 // G1CollectedHeap::allocate_new_alloc_region() and tells it to try
122 // to allocate a new region even if the max has been reached.
123 HeapWord* new_alloc_region_and_allocate(size_t word_size, bool force);
124
125 void fill_in_ext_msg(ar_ext_msg* msg, const char* message);
126
127 protected:
128 // Retire the active allocating region. If fill_up is true then make
129 // sure that the region is full before we retire it so that no one
130 // else can allocate out of it.
131 // Returns the number of bytes that have been filled up during retire.
132 virtual size_t retire(bool fill_up);
133
134 // For convenience as subclasses use it.
135 static G1CollectedHeap* _g1h;
136
137 virtual HeapRegion* allocate_new_region(size_t word_size, bool force) = 0;
138 virtual void retire_region(HeapRegion* alloc_region,
139 size_t allocated_bytes) = 0;
140
141 G1AllocRegion(const char* name, bool bot_updates);
142
143 public:
144 static void setup(G1CollectedHeap* g1h, HeapRegion* dummy_region);
145
146 HeapRegion* get() const {
147 HeapRegion * hr = _alloc_region;
148 // Make sure that the dummy region does not escape this class.
149 return (hr == _dummy_region) ? NULL : hr;
150 }
151
152 void set_allocation_context(AllocationContext_t context) { _allocation_context = context; }
153 AllocationContext_t allocation_context() { return _allocation_context; }
189 // Should be called when we want to release the active region which
190 // is returned after it's been retired.
191 virtual HeapRegion* release();
192
193 #if G1_ALLOC_REGION_TRACING
194 void trace(const char* str, size_t word_size = 0, HeapWord* result = NULL);
195 #else // G1_ALLOC_REGION_TRACING
196 void trace(const char* str, size_t word_size = 0, HeapWord* result = NULL) { }
197 #endif // G1_ALLOC_REGION_TRACING
198 };
199
200 class MutatorAllocRegion : public G1AllocRegion {
201 protected:
202 virtual HeapRegion* allocate_new_region(size_t word_size, bool force);
203 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes);
204 public:
205 MutatorAllocRegion()
206 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { }
207 };
208
209 // Common base class for allocation regions used during GC.
210 class G1GCAllocRegion : public G1AllocRegion {
211 protected:
212 G1EvacStats* _stats;
213 InCSetState::in_cset_state_t _purpose;
214
215 virtual HeapRegion* allocate_new_region(size_t word_size, bool force);
216 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes);
217
218 virtual size_t retire(bool fill_up);
219 public:
220 G1GCAllocRegion(const char* name, bool bot_updates, G1EvacStats* stats, InCSetState::in_cset_state_t purpose)
221 : G1AllocRegion(name, bot_updates), _stats(stats), _purpose(purpose) {
222 assert(stats != NULL, "Must pass non-NULL PLAB statistics");
223 }
224 };
225
226 class SurvivorGCAllocRegion : public G1GCAllocRegion {
227 public:
228 SurvivorGCAllocRegion(G1EvacStats* stats)
229 : G1GCAllocRegion("Survivor GC Alloc Region", false /* bot_updates */, stats, InCSetState::Young) { }
230 };
231
232 class OldGCAllocRegion : public G1GCAllocRegion {
233 public:
234 OldGCAllocRegion(G1EvacStats* stats)
235 : G1GCAllocRegion("Old GC Alloc Region", true /* bot_updates */, stats, InCSetState::Old) { }
236
237 // This specialization of release() makes sure that the last card that has
238 // been allocated into has been completely filled by a dummy object. This
239 // avoids races when remembered set scanning wants to update the BOT of the
240 // last card in the retained old gc alloc region, and allocation threads
241 // allocating into that card at the same time.
242 virtual HeapRegion* release();
243 };
244
245 class ar_ext_msg : public err_msg {
246 public:
247 ar_ext_msg(G1AllocRegion* alloc_region, const char *message) : err_msg("%s", "") {
248 alloc_region->fill_in_ext_msg(this, message);
249 }
250 };
251
252 #endif // SHARE_VM_GC_G1_G1ALLOCREGION_HPP
|