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#include <assert.h>
#include <errno.h>
#include <stddef.h> /* NULL, size_t */
#include <stdint.h> /* uintptr_t */
#include <stdio.h> /* fprintf */
#include <stdlib.h> /* exit */
#include <unistd.h> /* sysconf(_SC_PAGESIZE) */
#include <string.h> /* memset */
#include <sys/mman.h> /* mmap */
#define MIN_ALIGNMENT 16
#ifdef DONTNEED
#define MY_MADVISE_FREE MADV_DONTNEED
#else
#define MY_MADVISE_FREE MADV_FREE
#endif
#ifndef MEMSIZE
#define MEMSIZE 1024*4*1024*1024l
#endif
#ifndef NO_WILLNEED
#define WILLNEED_SIZE 32 * 1024 * 1024
#endif
// sizeof(tls_t) == 4096
//#define CACHE_BINS 511
#define CACHE_BINS 511
// max cached object: 511 * 64 - 1 = 32703
#define CACHE_BIN_SEPERATION 64
#define unlikely(x) __builtin_expect((x),0)
#ifdef __cplusplus
extern "C" {
#endif
size_t PAGE_SIZE = 0;
typedef struct chunk {
size_t size; // Size header field for internal use
struct chunk* next;
} chunk_t;
static inline chunk_t* ptr2chunk(void* ptr) {
return (chunk_t*)((uintptr_t)ptr - sizeof(size_t));
}
static inline void* chunk2ptr (chunk_t* chunk) {
return (void*)((uintptr_t)chunk + sizeof(size_t));
}
typedef struct TLStates {
uintptr_t ptr;
chunk_t* bins[CACHE_BINS];
} tls_t;
__thread tls_t* tls;
__thread uintptr_t next_willneed;
static inline int size2bin(size_t size) {
assert(size > 0 && size < CACHE_BINS * CACHE_BIN_SEPERATION);
return (size - 1) / CACHE_BIN_SEPERATION;
}
static inline size_t bin2size(int bin) {
assert(bin >= 0 && bin < CACHE_BINS);
return (bin + 1) * CACHE_BIN_SEPERATION;
}
static void init_tls(void) {
void *mem = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
if (mem == MAP_FAILED) {
perror("mmap");
exit(1);
}
tls = (tls_t*)mem;
tls->ptr = ((uintptr_t)tls) + sizeof(tls_t);
#ifndef NO_WILLNEED
next_willneed = tls->ptr;
#endif
PAGE_SIZE = sysconf(_SC_PAGESIZE);
}
static void* bump_alloc(size_t size) {
// allocate size header
tls->ptr += sizeof(size_t);
// align ptr
size_t mask = MIN_ALIGNMENT -1;
tls->ptr = (tls->ptr + mask) & ~mask;
#ifndef NO_WILLNEED
if(unlikely(tls->ptr >= next_willneed)) {
madvise((void*)next_willneed, WILLNEED_SIZE, MADV_WILLNEED);
next_willneed += WILLNEED_SIZE;
}
#endif
void* ptr = (void*)tls->ptr;
ptr2chunk(ptr)->size = size;
tls->ptr += size;
return ptr;
}
void* malloc(size_t size) {
if (unlikely(tls == NULL)) {
init_tls();
}
// cached sizes
if (size < CACHE_BINS * CACHE_BIN_SEPERATION) {
int bin = size2bin(size);
if (tls->bins[bin] != NULL) {
chunk_t* chunk = tls->bins[bin];
// remove first chunk from list
tls->bins[bin] = chunk->next;
return chunk2ptr(chunk);
}
return bump_alloc(bin2size(bin));
}
return bump_alloc(size);
}
void free(void* ptr) {
if (unlikely(tls == NULL)) {
init_tls();
}
if (ptr == NULL) {
return;
}
chunk_t* chunk = ptr2chunk(ptr);
if (chunk->size < CACHE_BINS * CACHE_BIN_SEPERATION) {
int bin = size2bin(chunk->size);
chunk->next = tls->bins[bin];
tls->bins[bin] = chunk;
}
#ifndef NO_FREE
else {
size_t size = chunk->size;
size -= ((uintptr_t)ptr % PAGE_SIZE); // size without part before a page boundry
size -= size % PAGE_SIZE; // size without part after a page boundry
size_t mask = PAGE_SIZE - 1;
void* page_start = (void*)(((uintptr_t)ptr + mask) & ~mask);
//fprintf(stderr, "ptr: %p, s: %ux, pages: %ux, page_ptr: %p\n",
// ptr, chunk->size, size, page_start);
madvise(page_start, size, MY_MADVISE_FREE);
}
#endif
}
void* memalign(size_t alignment, size_t size) {
/* if not power of two */
if (!((alignment != 0) && !(alignment & (alignment - 1)))) {
return NULL;
}
if (unlikely(tls == NULL)) {
init_tls();
}
// allocate size header
tls->ptr += sizeof(size_t);
// align returned pointer
size_t mask = alignment - 1;
tls->ptr = (tls->ptr + mask) & ~mask;
void* ptr = (void*)tls->ptr;
ptr2chunk(ptr)->size = size;
tls->ptr += size;
return ptr;
}
void malloc_stats() {
fprintf(stderr, "speedymalloc allocator by muhq\n");
fprintf(stderr, "Memsize: %zu, start address: %p, bump pointer %p\n", MEMSIZE, tls, tls->ptr);
}
#ifdef __cplusplus
}
#endif
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