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_GC_SHENANDOAH_HEURISTICS_SHENANDOAHPASSIVEHEURISTICS_HPP
26 #define SHARE_GC_SHENANDOAH_HEURISTICS_SHENANDOAHPASSIVEHEURISTICS_HPP
27
28 #include "gc/shenandoah/heuristics/shenandoahHeuristics.hpp"
29
30 class ShenandoahPassiveHeuristics : public ShenandoahHeuristics {
31 public:
32 virtual bool should_start_gc();
33
34 virtual bool should_unload_classes();
35
36 virtual bool should_degenerate_cycle();
37
38 virtual void choose_collection_set_from_regiondata(ShenandoahCollectionSet* set,
39 RegionData* data, size_t data_size,
40 size_t free);
41
42 virtual const char* name() { return "Passive"; }
43 virtual bool is_diagnostic() { return true; }
44 virtual bool is_experimental() { return false; }
45 };
46
47 #endif // SHARE_GC_SHENANDOAH_HEURISTICS_SHENANDOAHPASSIVEHEURISTICS_HPP
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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_GC_SHENANDOAH_HEURISTICS_SHENANDOAHPASSIVEHEURISTICS_HPP
26 #define SHARE_GC_SHENANDOAH_HEURISTICS_SHENANDOAHPASSIVEHEURISTICS_HPP
27
28 #include "gc/shenandoah/heuristics/shenandoahHeuristics.hpp"
29
30 /*
31 * The passive heuristic is for use only with the passive mode. In
32 * the passive mode, Shenandoah only performs STW (i.e., degenerated)
33 * collections. All the barriers are disabled and there are no concurrent
34 * activities. Therefore, this heuristic _never_ triggers a cycle. It
35 * will select regions for evacuation based on ShenandoahEvacReserve,
36 * ShenandoahEvacWaste and ShenandoahGarbageThreshold. Note that it does
37 * not attempt to evacuate regions with more garbage.
38 */
39 class ShenandoahPassiveHeuristics : public ShenandoahHeuristics {
40 public:
41 ShenandoahPassiveHeuristics(ShenandoahSpaceInfo* space_info);
42
43 virtual bool should_start_gc();
44
45 virtual bool should_unload_classes();
46
47 virtual bool should_degenerate_cycle();
48
49 virtual void choose_collection_set_from_regiondata(ShenandoahCollectionSet* set,
50 RegionData* data, size_t data_size,
51 size_t free);
52
53 virtual const char* name() { return "Passive"; }
54 virtual bool is_diagnostic() { return true; }
55 virtual bool is_experimental() { return false; }
56 };
57
58 #endif // SHARE_GC_SHENANDOAH_HEURISTICS_SHENANDOAHPASSIVEHEURISTICS_HPP
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