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initial experiment with fixed memory arena and sliced segments

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daan 2019-10-31 00:40:41 -07:00
parent c7ec30ae25
commit f7d2c45af3
13 changed files with 39 additions and 564 deletions
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6
include/mimalloc-internal.h
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@ -65,6 +65,12 @@ bool _mi_os_decommit(void* p, size_t size, mi_stats_t* stats);
bool _mi_os_reset(void* p, size_t size, mi_stats_t* stats);
bool _mi_os_unreset(void* p, size_t size, bool* is_zero, mi_stats_t* stats);
void* _mi_os_alloc_aligned(size_t size, size_t alignment, bool commit, bool* large, mi_os_tld_t* tld);
int _mi_os_reserve_huge_os_pages(size_t pages, double max_secs, size_t* pages_reserved) mi_attr_noexcept;
// arena.c
void* _mi_arena_alloc_aligned(size_t size, size_t alignment, bool* commit, bool* large, bool* is_zero, size_t* memid, mi_os_tld_t* tld);
void* _mi_arena_alloc(size_t size, bool* commit, bool* large, bool* is_zero, size_t* memid, mi_os_tld_t* tld);
void _mi_arena_free(void* p, size_t size, size_t memid, mi_stats_t* stats);
/*
// memory.c

8
include/mimalloc-types.h
View file

@ -239,12 +239,14 @@ typedef mi_page_t mi_slice_t;
// the OS. Inside segments we allocated fixed size _pages_ that
// contain blocks.
typedef struct mi_segment_s {
struct mi_segment_s* next; // the list of freed segments in the cache
volatile _Atomic(struct mi_segment_s*) abandoned_next;
size_t memid; // memory id for arena allocation
bool mem_is_fixed; // `true` if we cannot decommit/reset/protect in this memory (i.e. when allocated using large OS pages)
bool mem_is_committed; // `true` if the whole segment is eagerly committed
// from here is zero initialized
struct mi_segment_s* next; // the list of freed segments in the cache
volatile _Atomic(struct mi_segment_s*) abandoned_next;
size_t abandoned; // abandoned pages (i.e. the original owning thread stopped) (`abandoned <= used`)
size_t used; // count of pages in use
uintptr_t cookie; // verify addresses in debug mode: `mi_ptr_cookie(segment) == segment->cookie`