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src/hotspot/share/gc/shenandoah/heuristics/shenandoahAggressiveHeuristics.cpp

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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]._region;
48     if (r->garbage() > 0) {
49       cset->add_region(r);
50     }
51   }
52 }
53 
54 bool ShenandoahAggressiveHeuristics::should_start_gc() {
55   log_info(gc)("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 }

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_info(gc)("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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