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wip: delayed decommit on segments

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This commit is contained in:
daan 2019-11-21 19:53:43 -08:00
parent 1066be1594
commit 321e18777e
5 changed files with 103 additions and 31 deletions
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2
include/mimalloc-internal.h
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@ -66,7 +66,7 @@ bool _mi_os_unreset(void* p, size_t size, bool* is_zero, mi_stats_t* stats)
// 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, bool is_committed, bool is_large, mi_stats_t* stats);
void _mi_arena_free(void* p, size_t size, size_t memid, bool is_committed, bool is_large, mi_os_tld_t* tld);
// "segment.c"

14
include/mimalloc-types.h
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@ -235,6 +235,9 @@ typedef enum mi_segment_kind_e {
typedef mi_page_t mi_slice_t;
typedef int64_t mi_msecs_t;
// Segments are large allocated memory blocks (2mb on 64 bit) from
// the OS. Inside segments we allocated fixed size _pages_ that
// contain blocks.
@ -243,6 +246,11 @@ typedef struct mi_segment_s {
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
bool allow_decommit;
mi_msecs_t decommit_expire;
uintptr_t decommit_mask;
uintptr_t commit_mask;
// 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;
@ -254,9 +262,6 @@ typedef struct mi_segment_s {
size_t segment_slices; // for huge segments this may be different from `MI_SLICES_PER_SEGMENT`
size_t segment_info_slices; // initial slices we are using segment info and possible guard pages.
bool allow_decommit;
uintptr_t commit_mask;
// layout like this to optimize access in `mi_free`
mi_segment_kind_t kind;
volatile _Atomic(uintptr_t) thread_id; // unique id of the thread owning this segment
@ -415,9 +420,6 @@ typedef struct mi_span_queue_s {
#define MI_SEGMENT_BIN_MAX (35) // 35 == mi_segment_bin(MI_SLICES_PER_SEGMENT)
typedef int64_t mi_msecs_t;
// OS thread local data
typedef struct mi_os_tld_s {
size_t region_idx; // start point for next allocation