26 #include "gc_implementation/shenandoah/shenandoahCollectionSet.hpp"
27 #include "gc_implementation/shenandoah/heuristics/shenandoahCompactHeuristics.hpp"
28 #include "gc_implementation/shenandoah/shenandoahFreeSet.hpp"
29 #include "gc_implementation/shenandoah/shenandoahHeapRegion.hpp"
30 #include "gc_implementation/shenandoah/shenandoahLogging.hpp"
31
32 ShenandoahCompactHeuristics::ShenandoahCompactHeuristics() : ShenandoahHeuristics() {
33 SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
34 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);
35 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahUncommit);
36 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahAlwaysClearSoftRefs);
37 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahAllocationThreshold, 10);
38 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahImmediateThreshold, 100);
39 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahUncommitDelay, 1000);
40 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahGuaranteedGCInterval, 30000);
41 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahGarbageThreshold, 10);
42
43 // Final configuration checks
44 SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);
45 SHENANDOAH_CHECK_FLAG_SET(ShenandoahSATBBarrier);
46 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
47 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
48 }
49
50 bool ShenandoahCompactHeuristics::should_start_gc() const {
51 ShenandoahHeap* heap = ShenandoahHeap::heap();
52
53 size_t capacity = heap->max_capacity();
54 size_t available = heap->free_set()->available();
55
56 size_t threshold_bytes_allocated = capacity / 100 * ShenandoahAllocationThreshold;
57 size_t min_threshold = capacity / 100 * ShenandoahMinFreeThreshold;
58
59 if (available < min_threshold) {
60 log_info(gc)("Trigger: Free (" SIZE_FORMAT "%s) is below minimum threshold (" SIZE_FORMAT "%s)",
61 byte_size_in_proper_unit(available), proper_unit_for_byte_size(available),
62 byte_size_in_proper_unit(min_threshold), proper_unit_for_byte_size(min_threshold));
63 return true;
64 }
65
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26 #include "gc_implementation/shenandoah/shenandoahCollectionSet.hpp"
27 #include "gc_implementation/shenandoah/heuristics/shenandoahCompactHeuristics.hpp"
28 #include "gc_implementation/shenandoah/shenandoahFreeSet.hpp"
29 #include "gc_implementation/shenandoah/shenandoahHeapRegion.hpp"
30 #include "gc_implementation/shenandoah/shenandoahLogging.hpp"
31
32 ShenandoahCompactHeuristics::ShenandoahCompactHeuristics() : ShenandoahHeuristics() {
33 SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
34 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);
35 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahUncommit);
36 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahAlwaysClearSoftRefs);
37 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahAllocationThreshold, 10);
38 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahImmediateThreshold, 100);
39 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahUncommitDelay, 1000);
40 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahGuaranteedGCInterval, 30000);
41 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahGarbageThreshold, 10);
42
43 // Final configuration checks
44 SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);
45 SHENANDOAH_CHECK_FLAG_SET(ShenandoahSATBBarrier);
46 SHENANDOAH_CHECK_FLAG_SET(ShenandoahKeepAliveBarrier);
47 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
48 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
49 }
50
51 bool ShenandoahCompactHeuristics::should_start_gc() const {
52 ShenandoahHeap* heap = ShenandoahHeap::heap();
53
54 size_t capacity = heap->max_capacity();
55 size_t available = heap->free_set()->available();
56
57 size_t threshold_bytes_allocated = capacity / 100 * ShenandoahAllocationThreshold;
58 size_t min_threshold = capacity / 100 * ShenandoahMinFreeThreshold;
59
60 if (available < min_threshold) {
61 log_info(gc)("Trigger: Free (" SIZE_FORMAT "%s) is below minimum threshold (" SIZE_FORMAT "%s)",
62 byte_size_in_proper_unit(available), proper_unit_for_byte_size(available),
63 byte_size_in_proper_unit(min_threshold), proper_unit_for_byte_size(min_threshold));
64 return true;
65 }
66
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