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https://github.com/microsoft/mimalloc.git
synced 2024-12-26 21:04:27 +08:00
add heap walk test
This commit is contained in:
Daan Leijen
parent
5c7ada4b20
commit
e18a8cd72e
@ -256,6 +256,7 @@ typedef struct mi_heap_area_s {
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size_t committed; // current available bytes for this area
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size_t used; // number of allocated blocks
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size_t block_size; // size in bytes of each block
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size_t full_block_size; // size in bytes of a full block including padding and metadata.
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} mi_heap_area_t;
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typedef bool (mi_cdecl mi_block_visit_fun)(const mi_heap_t* heap, const mi_heap_area_t* area, void* block, size_t block_size, void* arg);
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@ -470,13 +470,14 @@ static bool mi_heap_area_visit_blocks(const mi_heap_area_ex_t* xarea, mi_block_v
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if (page->used == 0) return true;
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const size_t bsize = mi_page_block_size(page);
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const size_t ubsize = mi_page_usable_block_size(page); // without padding
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size_t psize;
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uint8_t* pstart = _mi_page_start(_mi_page_segment(page), page, &psize);
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if (page->capacity == 1) {
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// optimize page with one block
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mi_assert_internal(page->used == 1 && page->free == NULL);
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return visitor(mi_page_heap(page), area, pstart, bsize, arg);
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return visitor(mi_page_heap(page), area, pstart, ubsize, arg);
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}
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// create a bitmap of free blocks.
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@ -510,7 +511,7 @@ static bool mi_heap_area_visit_blocks(const mi_heap_area_ex_t* xarea, mi_block_v
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else if ((m & ((uintptr_t)1 << bit)) == 0) {
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used_count++;
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uint8_t* block = pstart + (i * bsize);
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if (!visitor(mi_page_heap(page), area, block, bsize, arg)) return false;
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if (!visitor(mi_page_heap(page), area, block, ubsize, arg)) return false;
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}
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}
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mi_assert_internal(page->used == used_count);
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@ -526,12 +527,14 @@ static bool mi_heap_visit_areas_page(mi_heap_t* heap, mi_page_queue_t* pq, mi_pa
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mi_heap_area_visit_fun* fun = (mi_heap_area_visit_fun*)vfun;
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mi_heap_area_ex_t xarea;
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const size_t bsize = mi_page_block_size(page);
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const size_t ubsize = mi_page_usable_block_size(page);
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xarea.page = page;
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xarea.area.reserved = page->reserved * bsize;
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xarea.area.committed = page->capacity * bsize;
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xarea.area.blocks = _mi_page_start(_mi_page_segment(page), page, NULL);
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xarea.area.used = page->used * bsize;
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xarea.area.block_size = bsize;
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xarea.area.block_size = ubsize;
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xarea.area.full_block_size = bsize;
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return fun(heap, &xarea, arg);
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}
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@ -16,6 +16,9 @@ static void test_aslr(void);
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static void test_process_info(void);
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static void test_reserved(void);
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static void negative_stat(void);
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static void alloc_huge(void);
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static void test_heap_walk(void);
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int main() {
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mi_version();
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@ -29,6 +32,8 @@ int main() {
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// invalid_free();
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// test_reserved();
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// negative_stat();
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test_heap_walk();
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// alloc_huge();
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void* p1 = malloc(78);
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void* p2 = malloc(24);
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@ -48,8 +53,10 @@ int main() {
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//free(p1);
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//p2 = malloc(32);
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//mi_free(p2);
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mi_collect(true);
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mi_stats_print(NULL);
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//mi_collect(true);
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//mi_stats_print(NULL);
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// test_process_info();
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return 0;
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}
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@ -179,4 +186,196 @@ static void negative_stat(void) {
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*p = 100;
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mi_free(p);
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mi_stats_print_out(NULL, NULL);
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}
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}
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static void alloc_huge(void) {
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void* p = mi_malloc(67108872);
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mi_free(p);
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}
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static bool test_visit(const mi_heap_t* heap, const mi_heap_area_t* area, void* block, size_t block_size, void* arg) {
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printf("I'm visiting a block of size %zu, allocated size %zu\n", block_size, mi_usable_size(block));
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return true;
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}
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static void test_heap_walk(void) {
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mi_heap_t* heap = mi_heap_new();
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//mi_heap_malloc(heap, 2097152);
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mi_heap_malloc(heap, 2067152);
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mi_heap_malloc(heap, 2097160);
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mi_heap_malloc(heap, 24576);
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mi_heap_visit_blocks(heap, true, &test_visit, NULL);
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}
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// ----------------------------
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// bin size experiments
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// ------------------------------
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#if 0
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#include <stdint.h>
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#include <stdbool.h>
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#define MI_INTPTR_SIZE 8
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#define MI_LARGE_WSIZE_MAX (4*1024*1024 / MI_INTPTR_SIZE)
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#define MI_BIN_HUGE 100
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//#define MI_ALIGN2W
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// Bit scan reverse: return the index of the highest bit.
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static inline uint8_t mi_bsr32(uint32_t x);
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#if defined(_MSC_VER)
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#include <windows.h>
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#include <intrin.h>
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static inline uint8_t mi_bsr32(uint32_t x) {
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uint32_t idx;
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_BitScanReverse((DWORD*)&idx, x);
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return idx;
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}
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#elif defined(__GNUC__) || defined(__clang__)
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static inline uint8_t mi_bsr32(uint32_t x) {
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return (31 - __builtin_clz(x));
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}
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#else
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static inline uint8_t mi_bsr32(uint32_t x) {
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// de Bruijn multiplication, see <http://supertech.csail.mit.edu/papers/debruijn.pdf>
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static const uint8_t debruijn[32] = {
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31, 0, 22, 1, 28, 23, 18, 2, 29, 26, 24, 10, 19, 7, 3, 12,
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30, 21, 27, 17, 25, 9, 6, 11, 20, 16, 8, 5, 15, 4, 14, 13,
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};
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x |= x >> 1;
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x |= x >> 2;
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x |= x >> 4;
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x |= x >> 8;
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x |= x >> 16;
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x++;
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return debruijn[(x*0x076be629) >> 27];
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}
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#endif
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/*
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// Bit scan reverse: return the index of the highest bit.
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uint8_t _mi_bsr(uintptr_t x) {
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if (x == 0) return 0;
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#if MI_INTPTR_SIZE==8
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uint32_t hi = (x >> 32);
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return (hi == 0 ? mi_bsr32((uint32_t)x) : 32 + mi_bsr32(hi));
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#elif MI_INTPTR_SIZE==4
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return mi_bsr32(x);
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#else
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# error "define bsr for non-32 or 64-bit platforms"
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#endif
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}
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*/
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static inline size_t _mi_wsize_from_size(size_t size) {
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return (size + sizeof(uintptr_t) - 1) / sizeof(uintptr_t);
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}
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// Return the bin for a given field size.
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// Returns MI_BIN_HUGE if the size is too large.
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// We use `wsize` for the size in "machine word sizes",
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// i.e. byte size == `wsize*sizeof(void*)`.
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extern inline uint8_t _mi_bin8(size_t size) {
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size_t wsize = _mi_wsize_from_size(size);
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uint8_t bin;
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if (wsize <= 1) {
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bin = 1;
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}
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#if defined(MI_ALIGN4W)
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else if (wsize <= 4) {
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bin = (uint8_t)((wsize+1)&~1); // round to double word sizes
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}
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#elif defined(MI_ALIGN2W)
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else if (wsize <= 8) {
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bin = (uint8_t)((wsize+1)&~1); // round to double word sizes
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}
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#else
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else if (wsize <= 8) {
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bin = (uint8_t)wsize;
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}
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#endif
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else if (wsize > MI_LARGE_WSIZE_MAX) {
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bin = MI_BIN_HUGE;
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}
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else {
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#if defined(MI_ALIGN4W)
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if (wsize <= 16) { wsize = (wsize+3)&~3; } // round to 4x word sizes
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#endif
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wsize--;
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// find the highest bit
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uint8_t b = mi_bsr32((uint32_t)wsize);
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// and use the top 3 bits to determine the bin (~12.5% worst internal fragmentation).
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// - adjust with 3 because we use do not round the first 8 sizes
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// which each get an exact bin
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bin = ((b << 2) + (uint8_t)((wsize >> (b - 2)) & 0x03)) - 3;
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}
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return bin;
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}
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static inline uint8_t _mi_bin4(size_t size) {
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size_t wsize = _mi_wsize_from_size(size);
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uint8_t bin;
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if (wsize <= 1) {
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bin = 1;
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}
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#if defined(MI_ALIGN4W)
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else if (wsize <= 4) {
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bin = (uint8_t)((wsize+1)&~1); // round to double word sizes
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}
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#elif defined(MI_ALIGN2W)
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else if (wsize <= 8) {
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bin = (uint8_t)((wsize+1)&~1); // round to double word sizes
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}
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#else
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else if (wsize <= 8) {
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bin = (uint8_t)wsize;
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}
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#endif
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else if (wsize > MI_LARGE_WSIZE_MAX) {
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bin = MI_BIN_HUGE;
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}
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else {
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uint8_t b = mi_bsr32((uint32_t)wsize);
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bin = ((b << 1) + (uint8_t)((wsize >> (b - 1)) & 0x01)) + 3;
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}
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return bin;
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}
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static size_t _mi_binx4(size_t bsize) {
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if (bsize==0) return 0;
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uint8_t b = mi_bsr32((uint32_t)bsize);
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if (b <= 1) return bsize;
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size_t bin = ((b << 1) | (bsize >> (b - 1))&0x01);
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return bin;
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}
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static size_t _mi_binx8(size_t bsize) {
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if (bsize<=1) return bsize;
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uint8_t b = mi_bsr32((uint32_t)bsize);
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if (b <= 2) return bsize;
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size_t bin = ((b << 2) | (bsize >> (b - 2))&0x03) - 5;
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return bin;
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}
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static void mi_bins(void) {
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//printf(" QNULL(1), /* 0 */ \\\n ");
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size_t last_bin = 0;
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size_t min_bsize = 0;
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size_t last_bsize = 0;
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for (size_t bsize = 1; bsize < 2*1024; bsize++) {
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size_t size = bsize * 64 * 1024;
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size_t bin = _mi_binx8(bsize);
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if (bin != last_bin) {
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printf("min bsize: %6zd, max bsize: %6zd, bin: %6zd\n", min_bsize, last_bsize, last_bin);
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//printf("QNULL(%6zd), ", wsize);
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//if (last_bin%8 == 0) printf("/* %i */ \\\n ", last_bin);
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last_bin = bin;
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min_bsize = bsize;
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}
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last_bsize = bsize;
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}
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}
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#endif
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