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optimize page struct layout

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This commit is contained in:
Daan Leijen 2024-03-24 22:41:33 -07:00
parent af3f2f9168
commit 7c17c3d33e
2 changed files with 7 additions and 6 deletions
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7
include/mimalloc/types.h
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@ -292,14 +292,15 @@ typedef struct mi_page_s {
// layout like this to optimize access in `mi_malloc` and `mi_free`
uint16_t capacity; // number of blocks committed, must be the first field, see `segment.c:page_clear`
uint16_t reserved; // number of blocks reserved in memory
uint16_t used; // number of blocks in use (including blocks in `thread_free`)
mi_page_flags_t flags; // `in_full` and `has_aligned` flags (8 bits)
uint8_t block_size_shift; // if not zero, then `(1 << block_size_shift) == block_size` (only used for fast path in `free.c:_mi_page_ptr_unalign`)
uint8_t free_is_zero:1; // `true` if the blocks in the free list are zero initialized
uint8_t retire_expire:7; // expiration count for retired blocks
// padding
mi_block_t* free; // list of available free blocks (`malloc` allocates from this list)
mi_block_t* local_free; // list of deferred free blocks by this thread (migrates to `free`)
uint16_t used; // number of blocks in use (including blocks in `thread_free`)
uint8_t block_size_shift; // if not zero, then `(1 << block_size_shift) == block_size` (only used for fast path in `free.c:_mi_page_ptr_unalign`)
// padding
size_t block_size; // size available in each block (always `>0`)
uint8_t* page_start; // start of the page area containing the blocks

6
src/init.c
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@ -14,17 +14,17 @@ terms of the MIT license. A copy of the license can be found in the file
// Empty page used to initialize the small free pages array
const mi_page_t _mi_page_empty = {
0,
0,
false, false, false, false,
0, // capacity
0, // reserved capacity
0, // used
{ 0 }, // flags
0, // block size shift
false, // is_zero
0, // retire_expire
NULL, // free
NULL, // local_free
0, // used
0, // block size shift
0, // block_size
NULL, // page_start
#if (MI_PADDING || MI_ENCODE_FREELIST)