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disable large pages by default

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Daan Leijen 2025-01-03 08:38:36 -08:00
parent 4e43ebb496
commit 2a75500ac2
2 changed files with 16 additions and 5 deletions
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15
include/mimalloc/types.h
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@ -99,6 +99,10 @@ terms of the MIT license. A copy of the license can be found in the file
#define MI_ENCODE_FREELIST 1
#endif
// Enable large pages for objects between 128KiB and 512KiB. Disabled by default.
#ifndef MI_ENABLE_LARGE_PAGES
#define MI_ENABLE_LARGE_PAGES 0
#endif
// --------------------------------------------------------------
// Sizes of internal data-structures
@ -131,6 +135,7 @@ terms of the MIT license. A copy of the license can be found in the file
#define MI_MEDIUM_PAGE_SIZE (8*MI_SMALL_PAGE_SIZE) // 512 KiB (=byte in the bchunk bitmap)
#define MI_LARGE_PAGE_SIZE (MI_SIZE_SIZE*MI_MEDIUM_PAGE_SIZE) // 4 MiB (=word in the bchunk bitmap)
// Maximum number of size classes. (spaced exponentially in 12.5% increments)
#define MI_BIN_HUGE (73U)
#define MI_BIN_FULL (MI_BIN_HUGE+1)
@ -328,8 +333,14 @@ typedef struct mi_page_s {
// The max object size are checked to not waste more than 12.5% internally over the page sizes.
// (Except for large pages since huge objects are allocated in 4MiB chunks)
#define MI_SMALL_MAX_OBJ_SIZE ((MI_SMALL_PAGE_SIZE-MI_PAGE_INFO_SIZE)/8) // < 8 KiB
#define MI_MEDIUM_MAX_OBJ_SIZE ((MI_MEDIUM_PAGE_SIZE-MI_PAGE_INFO_SIZE)/8) // < 64 KiB
#define MI_LARGE_MAX_OBJ_SIZE (MI_LARGE_PAGE_SIZE/4) // <= 512 KiB // note: this must be a nice power of 2 or we get rounding issues with `_mi_bin`
#if MI_ENABLE_LARGE_PAGES
#define MI_MEDIUM_MAX_OBJ_SIZE (MI_MEDIUM_PAGE_SIZE-MI_PAGE_INFO_SIZE)/8) // < 64 KiB
#define MI_LARGE_MAX_OBJ_SIZE (MI_LARGE_PAGE_SIZE/4) // <= 512 KiB // note: this must be a nice power of 2 or we get rounding issues with `_mi_bin`
#else
#define MI_MEDIUM_MAX_OBJ_SIZE (MI_MEDIUM_PAGE_SIZE/8) // <= 64 KiB
#define MI_LARGE_MAX_OBJ_SIZE MI_MEDIUM_MAX_OBJ_SIZE
#endif
#define MI_LARGE_MAX_OBJ_WSIZE (MI_LARGE_MAX_OBJ_SIZE/MI_SIZE_SIZE)