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add good-fit for allowing larger blocks in smaller segments

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daan 2019-08-09 11:18:38 -07:00
parent 5e56b40fe6
commit 442bad9190
7 changed files with 214 additions and 35 deletions
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26
include/mimalloc-types.h
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@ -91,21 +91,31 @@ terms of the MIT license. A copy of the license can be found in the file
#define MI_MEDIUM_PAGES_PER_SEGMENT (MI_SEGMENT_SIZE/MI_MEDIUM_PAGE_SIZE)
#define MI_LARGE_PAGES_PER_SEGMENT (MI_SEGMENT_SIZE/MI_LARGE_PAGE_SIZE)
#define MI_MEDIUM_SIZE_MAX (MI_MEDIUM_PAGE_SIZE/8) // 64kb on 64-bit
#define MI_LARGE_SIZE_MAX (MI_LARGE_PAGE_SIZE/8) // 512kb on 64-bit
#define MI_MEDIUM_SIZE_MAX (MI_MEDIUM_PAGE_SIZE/4) // 64kb on 64-bit
#define MI_LARGE_SIZE_MAX (MI_LARGE_PAGE_SIZE/4) // 512kb on 64-bit
#define MI_LARGE_WSIZE_MAX (MI_LARGE_SIZE_MAX>>MI_INTPTR_SHIFT)
// Maximum number of size classes. (spaced exponentially in 16.7% increments)
#define MI_BIN_HUGE (64U)
// Minimal alignment necessary. On most platforms 16 bytes are needed
// due to SSE registers for example. This must be at least `MI_INTPTR_SIZE`
#define MI_MAX_ALIGN_SIZE 16 // sizeof(max_align_t)
#if (MI_LARGE_WSIZE_MAX > 131072)
#define MI_BIN4
#ifdef MI_BIN4
// Maximum number of size classes. (spaced exponentially in 25% increments)
#define MI_BIN_HUGE (40U)
#if (MI_LARGE_WSIZE_MAX > 524287)
#error "define more bins"
#endif
#else
// Maximum number of size classes. (spaced exponentially in 12.5% increments)
#define MI_BIN_HUGE (70U)
#if (MI_LARGE_WSIZE_MAX > 393216)
#error "define more bins"
#endif
#endif
typedef uintptr_t mi_encoded_t;
@ -172,10 +182,10 @@ typedef struct mi_page_s {
bool is_reset:1; // `true` if the page memory was reset
bool is_committed:1; // `true` if the page virtual memory is committed
// layout like this to optimize access in `mi_malloc` and `mi_free`
// layout like this to optimize access in `mi_malloc` and `mi_free`
uint16_t capacity; // number of blocks committed
uint16_t reserved; // number of blocks reserved in memory
// 16 bits padding
// 16 bits padding
mi_block_t* free; // list of available free blocks (`malloc` allocates from this list)
#if MI_SECURE
uintptr_t cookie; // random cookie to encode the free lists