51
52 void ShenandoahPassiveHeuristics::choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
53 RegionData* data, size_t size,
54 size_t actual_free) {
55 assert(ShenandoahDegeneratedGC, "This path is only taken for Degenerated GC");
56
57 // Do not select too large CSet that would overflow the available free space.
58 // Take at least the entire evacuation reserve, and be free to overflow to free space.
59 size_t max_capacity = _space_info->max_capacity();
60 size_t available = MAX2(max_capacity / 100 * ShenandoahEvacReserve, actual_free);
61 size_t max_cset = (size_t)(available / ShenandoahEvacWaste);
62
63 log_info(gc, ergo)("CSet Selection. Actual Free: " SIZE_FORMAT "%s, Max CSet: " SIZE_FORMAT "%s",
64 byte_size_in_proper_unit(actual_free), proper_unit_for_byte_size(actual_free),
65 byte_size_in_proper_unit(max_cset), proper_unit_for_byte_size(max_cset));
66
67 size_t threshold = ShenandoahHeapRegion::region_size_bytes() * ShenandoahGarbageThreshold / 100;
68
69 size_t live_cset = 0;
70 for (size_t idx = 0; idx < size; idx++) {
71 ShenandoahHeapRegion* r = data[idx]._region;
72 size_t new_cset = live_cset + r->get_live_data_bytes();
73 if (new_cset < max_cset && r->garbage() > threshold) {
74 live_cset = new_cset;
75 cset->add_region(r);
76 }
77 }
78 }
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51
52 void ShenandoahPassiveHeuristics::choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
53 RegionData* data, size_t size,
54 size_t actual_free) {
55 assert(ShenandoahDegeneratedGC, "This path is only taken for Degenerated GC");
56
57 // Do not select too large CSet that would overflow the available free space.
58 // Take at least the entire evacuation reserve, and be free to overflow to free space.
59 size_t max_capacity = _space_info->max_capacity();
60 size_t available = MAX2(max_capacity / 100 * ShenandoahEvacReserve, actual_free);
61 size_t max_cset = (size_t)(available / ShenandoahEvacWaste);
62
63 log_info(gc, ergo)("CSet Selection. Actual Free: " SIZE_FORMAT "%s, Max CSet: " SIZE_FORMAT "%s",
64 byte_size_in_proper_unit(actual_free), proper_unit_for_byte_size(actual_free),
65 byte_size_in_proper_unit(max_cset), proper_unit_for_byte_size(max_cset));
66
67 size_t threshold = ShenandoahHeapRegion::region_size_bytes() * ShenandoahGarbageThreshold / 100;
68
69 size_t live_cset = 0;
70 for (size_t idx = 0; idx < size; idx++) {
71 ShenandoahHeapRegion* r = data[idx].get_region();
72 size_t new_cset = live_cset + r->get_live_data_bytes();
73 if (new_cset < max_cset && r->garbage() > threshold) {
74 live_cset = new_cset;
75 cset->add_region(r);
76 }
77 }
78 }
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