archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-20 11:04:34 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8241141: Restructure humongous object allocation in G1

Browse source 
Reviewed-by: tschatzl, kbarrett
This commit is contained in:
Stefan Johansson 2020-04-08 18:38:31 +02:00
parent dd4e04d6f5
commit 52ea4802f1
8 changed files with 162 additions and 103 deletions
Download patch file Download diff file Expand all files Collapse all files

39
src/hotspot/share/gc/g1/heapRegionManager.hpp
View file

@ -94,11 +94,19 @@ class HeapRegionManager: public CHeapObj<mtGC> {
// Notify other data structures about change in the heap layout.
void update_committed_space(HeapWord* old_end, HeapWord* new_end);
// Find a contiguous set of empty or uncommitted regions of length num and return
// Find a contiguous set of empty or uncommitted regions of length num_regions and return
// the index of the first region or G1_NO_HRM_INDEX if the search was unsuccessful.
// If only_empty is true, only empty regions are considered.
// Searches from bottom to top of the heap, doing a first-fit.
uint find_contiguous(size_t num, bool only_empty);
// Start and end defines the range to seek in, policy is first-fit.
uint find_contiguous_in_range(uint start, uint end, uint num_regions);
// Find a contiguous set of empty regions of length num_regions. Returns the start index
// of that set, or G1_NO_HRM_INDEX.
uint find_contiguous_in_free_list(uint num_regions);
// Find a contiguous set of empty or unavailable regions of length num_regions. Returns the
// start index of that set, or G1_NO_HRM_INDEX.
uint find_contiguous_allow_expand(uint num_regions);
void guarantee_contiguous_range(uint start, uint num_regions) ;
// Finds the next sequence of unavailable regions starting from start_idx. Returns the
// length of the sequence found. If this result is zero, no such sequence could be found,
// otherwise res_idx indicates the start index of these regions.
@ -122,6 +130,14 @@ protected:
void uncommit_regions(uint index, size_t num_regions = 1);
// Allocate a new HeapRegion for the given index.
HeapRegion* new_heap_region(uint hrm_index);
// Humongous allocation helpers
virtual HeapRegion* allocate_humongous_from_free_list(uint num_regions);
virtual HeapRegion* allocate_humongous_allow_expand(uint num_regions);
// Expand helper for cases when the regions to expand are well defined.
void expand_exact(uint start, uint num_regions, WorkGang* pretouch_workers);
#ifdef ASSERT
public:
bool is_free(HeapRegion* hr) const;
@ -183,7 +199,13 @@ public:
// Allocate a free region with specific node index. If fails allocate with next node index.
virtual HeapRegion* allocate_free_region(HeapRegionType type, uint requested_node_index);
inline void allocate_free_regions_starting_at(uint first, uint num_regions);
// Allocate a humongous object from the free list
HeapRegion* allocate_humongous(uint num_regions);
// Allocate a humongous object by expanding the heap
HeapRegion* expand_and_allocate_humongous(uint num_regions);
inline HeapRegion* allocate_free_regions_starting_at(uint first, uint num_regions);
// Remove all regions from the free list.
void remove_all_free_regions() {
@ -233,13 +255,6 @@ public:
// Try to expand on the given node index.
virtual uint expand_on_preferred_node(uint node_index);
// Find a contiguous set of empty regions of length num. Returns the start index of
// that set, or G1_NO_HRM_INDEX.
virtual uint find_contiguous_only_empty(size_t num) { return find_contiguous(num, true); }
// Find a contiguous set of empty or unavailable regions of length num. Returns the
// start index of that set, or G1_NO_HRM_INDEX.
virtual uint find_contiguous_empty_or_unavailable(size_t num) { return find_contiguous(num, false); }
HeapRegion* next_region_in_heap(const HeapRegion* r) const;
// Find the highest free or uncommitted region in the reserved heap,