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 #include "precompiled.hpp"
26
27 #include "gc/shenandoah/heuristics/shenandoahAggressiveHeuristics.hpp"
28 #include "gc/shenandoah/shenandoahCollectionSet.hpp"
29 #include "gc/shenandoah/shenandoahHeapRegion.inline.hpp"
30 #include "logging/log.hpp"
31 #include "logging/logTag.hpp"
32 #include "runtime/os.hpp"
33
34 ShenandoahAggressiveHeuristics::ShenandoahAggressiveHeuristics() : ShenandoahHeuristics() {
35 // Do not shortcut evacuation
36 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahImmediateThreshold, 100);
37
38 // Aggressive evacuates everything, so it needs as much evac space as it can get
39 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahEvacReserveOverflow);
40 }
41
42 void ShenandoahAggressiveHeuristics::choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
43 RegionData* data, size_t size,
44 size_t free) {
45 for (size_t idx = 0; idx < size; idx++) {
46 ShenandoahHeapRegion* r = data[idx]._region;
47 if (r->garbage() > 0) {
48 cset->add_region(r);
49 }
50 }
51 }
52
53 bool ShenandoahAggressiveHeuristics::should_start_gc() {
54 log_info(gc)("Trigger: Start next cycle immediately");
55 return true;
56 }
57
58 bool ShenandoahAggressiveHeuristics::should_unload_classes() {
59 if (!can_unload_classes()) return false;
60 if (has_metaspace_oom()) return true;
61 // Randomly unload classes with 50% chance.
62 return (os::random() & 1) == 1;
63 }
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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 #include "precompiled.hpp"
26
27 #include "gc/shenandoah/heuristics/shenandoahAggressiveHeuristics.hpp"
28 #include "gc/shenandoah/shenandoahCollectionSet.hpp"
29 #include "gc/shenandoah/shenandoahHeapRegion.inline.hpp"
30 #include "logging/log.hpp"
31 #include "logging/logTag.hpp"
32 #include "runtime/os.hpp"
33
34 ShenandoahAggressiveHeuristics::ShenandoahAggressiveHeuristics(ShenandoahSpaceInfo* space_info) :
35 ShenandoahHeuristics(space_info) {
36 // Do not shortcut evacuation
37 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahImmediateThreshold, 100);
38
39 // Aggressive evacuates everything, so it needs as much evac space as it can get
40 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahEvacReserveOverflow);
41 }
42
43 void ShenandoahAggressiveHeuristics::choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
44 RegionData* data, size_t size,
45 size_t free) {
46 for (size_t idx = 0; idx < size; idx++) {
47 ShenandoahHeapRegion* r = data[idx].get_region();
48 if (r->garbage() > 0) {
49 cset->add_region(r);
50 }
51 }
52 }
53
54 bool ShenandoahAggressiveHeuristics::should_start_gc() {
55 log_trigger("Start next cycle immediately");
56 return true;
57 }
58
59 bool ShenandoahAggressiveHeuristics::should_unload_classes() {
60 if (!can_unload_classes()) return false;
61 if (has_metaspace_oom()) return true;
62 // Randomly unload classes with 50% chance.
63 return (os::random() & 1) == 1;
64 }
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