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_HEAPREGIONMANAGER_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONMANAGER_HPP
27
28 #include "gc_implementation/g1/g1BiasedArray.hpp"
29 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
30 #include "gc_implementation/g1/heapRegionSet.hpp"
31 #include "services/memoryUsage.hpp"
32
33 class HeapRegion;
34 class HeapRegionClosure;
35 class HeapRegionClaimer;
36 class FreeRegionList;
37
38 class G1HeapRegionTable : public G1BiasedMappedArray<HeapRegion*> {
39 protected:
40 virtual HeapRegion* default_value() const { return NULL; }
41 };
42
43 // This class keeps track of the actual heap memory, auxiliary data
44 // and its metadata (i.e., HeapRegion instances) and the list of free regions.
45 //
46 // This allows maximum flexibility for deciding what to commit or uncommit given
47 // a request from outside.
48 //
49 // HeapRegions are kept in the _regions array in address order. A region's
50 // index in the array corresponds to its index in the heap (i.e., 0 is the
248 static const uint Claimed = 1;
249
250 public:
251 HeapRegionClaimer(uint n_workers);
252 ~HeapRegionClaimer();
253
254 inline uint n_regions() const {
255 return _n_regions;
256 }
257
258 // Calculate the starting region for given worker so
259 // that they do not all start from the same region.
260 uint start_region_for_worker(uint worker_id) const;
261
262 // Check if region has been claimed with this HRClaimer.
263 bool is_region_claimed(uint region_index) const;
264
265 // Claim the given region, returns true if successfully claimed.
266 bool claim_region(uint region_index);
267 };
268 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONMANAGER_HPP
269
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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_HEAPREGIONMANAGER_HPP
26 #define SHARE_VM_GC_G1_HEAPREGIONMANAGER_HPP
27
28 #include "gc/g1/g1BiasedArray.hpp"
29 #include "gc/g1/g1RegionToSpaceMapper.hpp"
30 #include "gc/g1/heapRegionSet.hpp"
31 #include "services/memoryUsage.hpp"
32
33 class HeapRegion;
34 class HeapRegionClosure;
35 class HeapRegionClaimer;
36 class FreeRegionList;
37
38 class G1HeapRegionTable : public G1BiasedMappedArray<HeapRegion*> {
39 protected:
40 virtual HeapRegion* default_value() const { return NULL; }
41 };
42
43 // This class keeps track of the actual heap memory, auxiliary data
44 // and its metadata (i.e., HeapRegion instances) and the list of free regions.
45 //
46 // This allows maximum flexibility for deciding what to commit or uncommit given
47 // a request from outside.
48 //
49 // HeapRegions are kept in the _regions array in address order. A region's
50 // index in the array corresponds to its index in the heap (i.e., 0 is the
248 static const uint Claimed = 1;
249
250 public:
251 HeapRegionClaimer(uint n_workers);
252 ~HeapRegionClaimer();
253
254 inline uint n_regions() const {
255 return _n_regions;
256 }
257
258 // Calculate the starting region for given worker so
259 // that they do not all start from the same region.
260 uint start_region_for_worker(uint worker_id) const;
261
262 // Check if region has been claimed with this HRClaimer.
263 bool is_region_claimed(uint region_index) const;
264
265 // Claim the given region, returns true if successfully claimed.
266 bool claim_region(uint region_index);
267 };
268 #endif // SHARE_VM_GC_G1_HEAPREGIONMANAGER_HPP
269
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