27 #include "gc/shenandoah/shenandoahCollectionSet.hpp"
28 #include "gc/shenandoah/heuristics/shenandoahCompactHeuristics.hpp"
29 #include "gc/shenandoah/shenandoahFreeSet.hpp"
30 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
31 #include "logging/log.hpp"
32 #include "logging/logTag.hpp"
33
34 ShenandoahCompactHeuristics::ShenandoahCompactHeuristics() : ShenandoahHeuristics() {
35 SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
36 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);
37 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahUncommit);
38 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahAlwaysClearSoftRefs);
39 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahAllocationThreshold, 10);
40 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahImmediateThreshold, 100);
41 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahUncommitDelay, 1000);
42 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahGuaranteedGCInterval, 30000);
43 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahGarbageThreshold, 10);
44
45 // Final configuration checks
46 SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);
47 SHENANDOAH_CHECK_FLAG_SET(ShenandoahSATBBarrier);
48 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
49 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
50 }
51
52 bool ShenandoahCompactHeuristics::should_start_gc() const {
53 ShenandoahHeap* heap = ShenandoahHeap::heap();
54
55 size_t capacity = heap->max_capacity();
56 size_t available = heap->free_set()->available();
57
58 size_t threshold_bytes_allocated = capacity / 100 * ShenandoahAllocationThreshold;
59 size_t min_threshold = capacity / 100 * ShenandoahMinFreeThreshold;
60
61 if (available < min_threshold) {
62 log_info(gc)("Trigger: Free (" SIZE_FORMAT "%s) is below minimum threshold (" SIZE_FORMAT "%s)",
63 byte_size_in_proper_unit(available), proper_unit_for_byte_size(available),
64 byte_size_in_proper_unit(min_threshold), proper_unit_for_byte_size(min_threshold));
65 return true;
66 }
67
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27 #include "gc/shenandoah/shenandoahCollectionSet.hpp"
28 #include "gc/shenandoah/heuristics/shenandoahCompactHeuristics.hpp"
29 #include "gc/shenandoah/shenandoahFreeSet.hpp"
30 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
31 #include "logging/log.hpp"
32 #include "logging/logTag.hpp"
33
34 ShenandoahCompactHeuristics::ShenandoahCompactHeuristics() : ShenandoahHeuristics() {
35 SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
36 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);
37 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahUncommit);
38 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahAlwaysClearSoftRefs);
39 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahAllocationThreshold, 10);
40 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahImmediateThreshold, 100);
41 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahUncommitDelay, 1000);
42 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahGuaranteedGCInterval, 30000);
43 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahGarbageThreshold, 10);
44
45 // Final configuration checks
46 SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);
47 SHENANDOAH_CHECK_FLAG_SET(ShenandoahSATBBarrier || ShenandoahStoreValEnqueueBarrier);
48 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
49 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
50 }
51
52 bool ShenandoahCompactHeuristics::should_start_gc() const {
53 ShenandoahHeap* heap = ShenandoahHeap::heap();
54
55 size_t capacity = heap->max_capacity();
56 size_t available = heap->free_set()->available();
57
58 size_t threshold_bytes_allocated = capacity / 100 * ShenandoahAllocationThreshold;
59 size_t min_threshold = capacity / 100 * ShenandoahMinFreeThreshold;
60
61 if (available < min_threshold) {
62 log_info(gc)("Trigger: Free (" SIZE_FORMAT "%s) is below minimum threshold (" SIZE_FORMAT "%s)",
63 byte_size_in_proper_unit(available), proper_unit_for_byte_size(available),
64 byte_size_in_proper_unit(min_threshold), proper_unit_for_byte_size(min_threshold));
65 return true;
66 }
67
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