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Optimize region count #56471

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Merged
merged 2 commits into from
Jul 30, 2021
Merged

Optimize region count #56471

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275dabd
We have a couple of arrays with an entry per region - instead of iter…
PeterSolMS Jul 28, 2021
0e1c18d
Address code review feedback - replace code that is dead now (never e…
PeterSolMS Jul 29, 2021
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17 changes: 4 additions & 13 deletions src/coreclr/gc/gc.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2297,6 +2297,7 @@ bool affinity_config_specified_p = false;
#ifdef USE_REGIONS
region_allocator global_region_allocator;
uint8_t*(*initial_regions)[total_generation_count][2] = nullptr;
size_t gc_heap::region_count = 0;
#endif //USE_REGIONS

#ifdef BACKGROUND_GC
Expand Down Expand Up @@ -3512,12 +3513,6 @@ size_t get_basic_region_index_for_address (uint8_t* address)
return (basic_region_index - ((size_t)g_gc_lowest_address >> gc_heap::min_segment_size_shr));
}

inline
size_t get_total_region_count()
{
return (get_basic_region_index_for_address (g_gc_highest_address) + 1);
}

// Go from a random address to its region info. The random address could be
// in one of the basic regions of a larger region so we need to check for that.
inline
Expand Down Expand Up @@ -9741,7 +9736,6 @@ size_t gc_heap::sort_mark_list()

#ifdef USE_REGIONS
// first set the pieces for all regions to empty
size_t region_count = get_total_region_count();
assert (g_mark_list_piece_size >= region_count);
for (size_t region_index = 0; region_index < region_count; region_index++)
{
Expand Down Expand Up @@ -21138,7 +21132,6 @@ size_t gc_heap::get_promoted_bytes()
}

dprintf (3, ("h%d getting surv", heap_number));
size_t region_count = get_total_region_count();
size_t promoted = 0;
for (size_t i = 0; i < region_count; i++)
{
Expand Down Expand Up @@ -23934,6 +23927,7 @@ void gc_heap::mark_phase (int condemned_gen_number, BOOL mark_only_p)

#ifdef USE_REGIONS
special_sweep_p = false;
region_count = global_region_allocator.get_used_region_count();
grow_mark_list_piece();
#endif //USE_REGIONS

Expand Down Expand Up @@ -24002,7 +23996,7 @@ void gc_heap::mark_phase (int condemned_gen_number, BOOL mark_only_p)
#endif //MULTIPLE_HEAPS
survived_per_region = (size_t*)&g_mark_list_piece[heap_number * 2 * g_mark_list_piece_size];
old_card_survived_per_region = (size_t*)&survived_per_region[g_mark_list_piece_size];
size_t region_info_to_clear = get_total_region_count() * sizeof (size_t);
size_t region_info_to_clear = region_count * sizeof (size_t);
memset (survived_per_region, 0, region_info_to_clear);
memset (old_card_survived_per_region, 0, region_info_to_clear);
}
Expand Down Expand Up @@ -26213,7 +26207,6 @@ void gc_heap::process_remaining_regions (int current_plan_gen_num, generation* c

void gc_heap::grow_mark_list_piece()
{
size_t region_count = get_total_region_count();
if (g_mark_list_piece_size < region_count)
{
delete[] g_mark_list_piece;
Expand All @@ -26238,11 +26231,10 @@ void gc_heap::save_current_survived()
{
if (!survived_per_region) return;

size_t region_info_to_copy = get_total_region_count() * sizeof (size_t);
size_t region_info_to_copy = region_count * sizeof (size_t);
memcpy (old_card_survived_per_region, survived_per_region, region_info_to_copy);

#ifdef _DEBUG
size_t region_count = get_total_region_count();
for (size_t region_index = 0; region_index < region_count; region_index++)
{
if (survived_per_region[region_index] != 0)
Expand All @@ -26259,7 +26251,6 @@ void gc_heap::update_old_card_survived()
{
if (!survived_per_region) return;

size_t region_count = get_total_region_count();
for (size_t region_index = 0; region_index < region_count; region_index++)
{
old_card_survived_per_region[region_index] = survived_per_region[region_index] -
Expand Down
10 changes: 10 additions & 0 deletions src/coreclr/gc/gcpriv.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3585,6 +3585,8 @@ class gc_heap
size_t* survived_per_region;
PER_HEAP
size_t* old_card_survived_per_region;
PER_HEAP_ISOLATED
size_t region_count;
#endif //USE_REGIONS

#define max_oom_history_count 4
Expand Down Expand Up @@ -5694,6 +5696,14 @@ class region_allocator
size_t get_free() { return (total_free_units * region_alignment) ; }
size_t get_region_alignment () { return region_alignment; }
size_t get_large_region_alignment () { return large_region_alignment; }
size_t get_used_region_count()
{
// currently we don't allocate anything from the right -
// once we do, we need a more sophisticated way to iterate
// through the used regions
assert (region_map_right_start == region_map_right_end);
return (region_map_left_end - region_map_left_start);
}
};
#endif //USE_REGIONS

Expand Down