#include <assert.h>
#include <string.h>
#include <unistd.h>
+#include <inttypes.h>
#include <sys/types.h>
#include <limits.h>
+#include <fcntl.h>
#include "mutex.h"
+#include "arch/arch.h"
+#include "os/os.h"
+#include "smalloc.h"
+#include "log.h"
-#define MP_SAFE /* define to made allocator thread safe */
+#define SMALLOC_REDZONE /* define to detect memory corruption */
-#define INITIAL_SIZE 32*1048576 /* new pool size */
-#define MAX_POOLS 4 /* maximum number of pools to setup */
+#define SMALLOC_BPB 32 /* block size, bytes-per-bit in bitmap */
+#define SMALLOC_BPI (sizeof(unsigned int) * 8)
+#define SMALLOC_BPL (SMALLOC_BPB * SMALLOC_BPI)
+
+#define INITIAL_SIZE 16*1024*1024 /* new pool size */
+#define MAX_POOLS 8 /* maximum number of pools to setup */
+
+#define SMALLOC_PRE_RED 0xdeadbeefU
+#define SMALLOC_POST_RED 0x5aa55aa5U
unsigned int smalloc_pool_size = INITIAL_SIZE;
+static const int int_mask = sizeof(int) - 1;
struct pool {
struct fio_mutex *lock; /* protects this pool */
void *map; /* map of blocks */
- void *last; /* next free block hint */
- unsigned int size; /* size of pool */
- unsigned int room; /* size left in pool */
- unsigned int largest_block; /* largest block free */
- unsigned int free_since_compact; /* sfree() since compact() */
- int fd; /* memory backing fd */
- char file[PATH_MAX]; /* filename for fd */
+ unsigned int *bitmap; /* blocks free/busy map */
+ size_t free_blocks; /* free blocks */
+ size_t nr_blocks; /* total blocks */
+ size_t next_non_full;
+ size_t mmap_size;
+};
+
+struct block_hdr {
+ size_t size;
+#ifdef SMALLOC_REDZONE
+ unsigned int prered;
+#endif
};
static struct pool mp[MAX_POOLS];
static unsigned int nr_pools;
static unsigned int last_pool;
-static struct fio_mutex *lock;
-
-struct mem_hdr {
- unsigned int size;
-};
+static struct fio_rwlock *lock;
static inline void pool_lock(struct pool *pool)
{
- if (pool->lock)
- fio_mutex_down(pool->lock);
+ fio_mutex_down(pool->lock);
}
static inline void pool_unlock(struct pool *pool)
{
- if (pool->lock)
- fio_mutex_up(pool->lock);
+ fio_mutex_up(pool->lock);
}
static inline void global_read_lock(void)
{
- if (lock)
- fio_mutex_down_read(lock);
+ fio_rwlock_read(lock);
}
static inline void global_read_unlock(void)
{
- if (lock)
- fio_mutex_up_read(lock);
+ fio_rwlock_unlock(lock);
}
static inline void global_write_lock(void)
{
- if (lock)
- fio_mutex_down_write(lock);
+ fio_rwlock_write(lock);
}
static inline void global_write_unlock(void)
{
- if (lock)
- fio_mutex_up_write(lock);
+ fio_rwlock_unlock(lock);
}
-#define hdr_free(hdr) ((hdr)->size & 0x80000000)
-#define hdr_size(hdr) ((hdr)->size & ~0x80000000)
-#define hdr_mark_free(hdr) ((hdr)->size |= 0x80000000)
-
static inline int ptr_valid(struct pool *pool, void *ptr)
{
- return (ptr >= pool->map) && (ptr < pool->map + pool->size);
-}
+ unsigned int pool_size = pool->nr_blocks * SMALLOC_BPL;
-static inline int __hdr_valid(struct pool *pool, struct mem_hdr *hdr,
- unsigned int size)
-{
- return ptr_valid(pool, hdr) && ptr_valid(pool, (void *) hdr + size - 1);
+ return (ptr >= pool->map) && (ptr < pool->map + pool_size);
}
-static inline int hdr_valid(struct pool *pool, struct mem_hdr *hdr)
+static inline size_t size_to_blocks(size_t size)
{
- return __hdr_valid(pool, hdr, hdr_size(hdr));
+ return (size + SMALLOC_BPB - 1) / SMALLOC_BPB;
}
-static inline int region_free(struct mem_hdr *hdr)
+static int blocks_iter(struct pool *pool, unsigned int pool_idx,
+ unsigned int idx, size_t nr_blocks,
+ int (*func)(unsigned int *map, unsigned int mask))
{
- return hdr_free(hdr) || (!hdr_free(hdr) && !hdr_size(hdr));
-}
-static inline struct mem_hdr *__hdr_nxt(struct pool *pool, struct mem_hdr *hdr,
- unsigned int size)
-{
- struct mem_hdr *nxt = (void *) hdr + size + sizeof(*hdr);
+ while (nr_blocks) {
+ unsigned int this_blocks, mask;
+ unsigned int *map;
- if (__hdr_valid(pool, nxt, size))
- return nxt;
+ if (pool_idx >= pool->nr_blocks)
+ return 0;
- return NULL;
-}
+ map = &pool->bitmap[pool_idx];
-static inline struct mem_hdr *hdr_nxt(struct pool *pool, struct mem_hdr *hdr)
-{
- return __hdr_nxt(pool, hdr, hdr_size(hdr));
-}
+ this_blocks = nr_blocks;
+ if (this_blocks + idx > SMALLOC_BPI) {
+ this_blocks = SMALLOC_BPI - idx;
+ idx = SMALLOC_BPI - this_blocks;
+ }
-static void merge(struct pool *pool, struct mem_hdr *hdr, struct mem_hdr *nxt)
-{
- unsigned int hfree = hdr_free(hdr);
- unsigned int nfree = hdr_free(nxt);
+ if (this_blocks == SMALLOC_BPI)
+ mask = -1U;
+ else
+ mask = ((1U << this_blocks) - 1) << idx;
- hdr->size = hdr_size(hdr) + hdr_size(nxt) + sizeof(*nxt);
- nxt->size = 0;
+ if (!func(map, mask))
+ return 0;
- if (hfree)
- hdr_mark_free(hdr);
- if (nfree)
- hdr_mark_free(nxt);
+ nr_blocks -= this_blocks;
+ idx = 0;
+ pool_idx++;
+ }
- if (pool->last == nxt)
- pool->last = hdr;
+ return 1;
}
-static int combine(struct pool *pool, struct mem_hdr *prv, struct mem_hdr *hdr)
+static int mask_cmp(unsigned int *map, unsigned int mask)
{
- if (prv && hdr_free(prv) && hdr_free(hdr)) {
- merge(pool, prv, hdr);
- return 1;
- }
+ return !(*map & mask);
+}
- return 0;
+static int mask_clear(unsigned int *map, unsigned int mask)
+{
+ assert((*map & mask) == mask);
+ *map &= ~mask;
+ return 1;
}
-static int compact_pool(struct pool *pool)
+static int mask_set(unsigned int *map, unsigned int mask)
{
- struct mem_hdr *hdr = pool->map, *nxt;
- unsigned int compacted = 0;
+ assert(!(*map & mask));
+ *map |= mask;
+ return 1;
+}
- if (pool->free_since_compact < 50)
- return 1;
+static int blocks_free(struct pool *pool, unsigned int pool_idx,
+ unsigned int idx, size_t nr_blocks)
+{
+ return blocks_iter(pool, pool_idx, idx, nr_blocks, mask_cmp);
+}
- while (hdr) {
- nxt = hdr_nxt(pool, hdr);
- if (!nxt)
- break;
- if (hdr_free(nxt) && hdr_free(hdr)) {
- merge(pool, hdr, nxt);
- compacted++;
- continue;
- }
- hdr = hdr_nxt(pool, hdr);
- }
+static void set_blocks(struct pool *pool, unsigned int pool_idx,
+ unsigned int idx, size_t nr_blocks)
+{
+ blocks_iter(pool, pool_idx, idx, nr_blocks, mask_set);
+}
- pool->free_since_compact = 0;
- return !!compacted;
+static void clear_blocks(struct pool *pool, unsigned int pool_idx,
+ unsigned int idx, size_t nr_blocks)
+{
+ blocks_iter(pool, pool_idx, idx, nr_blocks, mask_clear);
+}
+
+static int find_next_zero(int word, int start)
+{
+ assert(word != -1U);
+ word >>= start;
+ return ffz(word) + start;
}
static int add_pool(struct pool *pool, unsigned int alloc_size)
{
- struct mem_hdr *hdr;
+ int bitmap_blocks;
+ int mmap_flags;
void *ptr;
- int fd;
- strcpy(pool->file, "/tmp/.fio_smalloc.XXXXXX");
- fd = mkstemp(pool->file);
- if (fd < 0)
- goto out_close;
-
- alloc_size += sizeof(*hdr);
- if (alloc_size > smalloc_pool_size)
- pool->size = alloc_size;
- else
- pool->size = smalloc_pool_size;
-
- if (ftruncate(fd, pool->size) < 0)
- goto out_unlink;
+#ifdef SMALLOC_REDZONE
+ alloc_size += sizeof(unsigned int);
+#endif
+ alloc_size += sizeof(struct block_hdr);
+ if (alloc_size < INITIAL_SIZE)
+ alloc_size = INITIAL_SIZE;
+
+ /* round up to nearest full number of blocks */
+ alloc_size = (alloc_size + SMALLOC_BPL - 1) & ~(SMALLOC_BPL - 1);
+ bitmap_blocks = alloc_size / SMALLOC_BPL;
+ alloc_size += bitmap_blocks * sizeof(unsigned int);
+ pool->mmap_size = alloc_size;
+
+ pool->nr_blocks = bitmap_blocks;
+ pool->free_blocks = bitmap_blocks * SMALLOC_BPB;
+
+ mmap_flags = OS_MAP_ANON;
+#ifdef CONFIG_ESX
+ mmap_flags |= MAP_PRIVATE;
+#else
+ mmap_flags |= MAP_SHARED;
+#endif
+ ptr = mmap(NULL, alloc_size, PROT_READ|PROT_WRITE, mmap_flags, -1, 0);
- ptr = mmap(NULL, pool->size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (ptr == MAP_FAILED)
- goto out_unlink;
+ goto out_fail;
- memset(ptr, 0, pool->size);
- pool->map = pool->last = ptr;
+ memset(ptr, 0, alloc_size);
+ pool->map = ptr;
+ pool->bitmap = (void *) ptr + (pool->nr_blocks * SMALLOC_BPL);
-#ifdef MP_SAFE
- pool->lock = fio_mutex_init(1);
+ pool->lock = fio_mutex_init(FIO_MUTEX_UNLOCKED);
if (!pool->lock)
- goto out_unlink;
-#endif
+ goto out_fail;
- pool->fd = fd;
-
- hdr = pool->map;
- pool->room = hdr->size = pool->size - sizeof(*hdr);
- pool->largest_block = pool->room;
- hdr_mark_free(hdr);
- global_write_lock();
nr_pools++;
- global_write_unlock();
return 0;
-out_unlink:
+out_fail:
+ log_err("smalloc: failed adding pool\n");
if (pool->map)
- munmap(pool->map, pool->size);
- unlink(pool->file);
-out_close:
- if (fd >= 0)
- close(fd);
+ munmap(pool->map, pool->mmap_size);
return 1;
}
void sinit(void)
{
- int ret;
+ int i, ret;
-#ifdef MP_SAFE
- lock = fio_mutex_rw_init();
-#endif
- ret = add_pool(&mp[0], INITIAL_SIZE);
- assert(!ret);
+ lock = fio_rwlock_init();
+
+ for (i = 0; i < MAX_POOLS; i++) {
+ ret = add_pool(&mp[i], INITIAL_SIZE);
+ if (ret)
+ break;
+ }
+
+ /*
+ * If we added at least one pool, we should be OK for most
+ * cases.
+ */
+ assert(i);
}
static void cleanup_pool(struct pool *pool)
{
- unlink(pool->file);
- close(pool->fd);
- munmap(pool->map, pool->size);
+ /*
+ * This will also remove the temporary file we used as a backing
+ * store, it was already unlinked
+ */
+ munmap(pool->map, pool->mmap_size);
if (pool->lock)
fio_mutex_remove(pool->lock);
cleanup_pool(&mp[i]);
if (lock)
- fio_mutex_remove(lock);
+ fio_rwlock_remove(lock);
+}
+
+#ifdef SMALLOC_REDZONE
+static void *postred_ptr(struct block_hdr *hdr)
+{
+ uintptr_t ptr;
+
+ ptr = (uintptr_t) hdr + hdr->size - sizeof(unsigned int);
+ ptr = (ptr + int_mask) & ~int_mask;
+
+ return (void *) ptr;
+}
+
+static void fill_redzone(struct block_hdr *hdr)
+{
+ unsigned int *postred = postred_ptr(hdr);
+
+ hdr->prered = SMALLOC_PRE_RED;
+ *postred = SMALLOC_POST_RED;
+}
+
+static void sfree_check_redzone(struct block_hdr *hdr)
+{
+ unsigned int *postred = postred_ptr(hdr);
+
+ if (hdr->prered != SMALLOC_PRE_RED) {
+ log_err("smalloc pre redzone destroyed!\n"
+ " ptr=%p, prered=%x, expected %x\n",
+ hdr, hdr->prered, SMALLOC_PRE_RED);
+ assert(0);
+ }
+ if (*postred != SMALLOC_POST_RED) {
+ log_err("smalloc post redzone destroyed!\n"
+ " ptr=%p, postred=%x, expected %x\n",
+ hdr, *postred, SMALLOC_POST_RED);
+ assert(0);
+ }
+}
+#else
+static void fill_redzone(struct block_hdr *hdr)
+{
+}
+
+static void sfree_check_redzone(struct block_hdr *hdr)
+{
}
+#endif
static void sfree_pool(struct pool *pool, void *ptr)
{
- struct mem_hdr *hdr, *nxt;
+ struct block_hdr *hdr;
+ unsigned int i, idx;
+ unsigned long offset;
if (!ptr)
return;
- assert(ptr_valid(pool, ptr));
+ ptr -= sizeof(*hdr);
+ hdr = ptr;
- pool_lock(pool);
- hdr = ptr - sizeof(*hdr);
- assert(!hdr_free(hdr));
- hdr_mark_free(hdr);
- pool->room -= hdr_size(hdr);
+ assert(ptr_valid(pool, ptr));
- nxt = hdr_nxt(pool, hdr);
- if (nxt && hdr_free(nxt))
- merge(pool, hdr, nxt);
+ sfree_check_redzone(hdr);
- if (hdr_size(hdr) > pool->largest_block)
- pool->largest_block = hdr_size(hdr);
+ offset = ptr - pool->map;
+ i = offset / SMALLOC_BPL;
+ idx = (offset % SMALLOC_BPL) / SMALLOC_BPB;
- pool->free_since_compact++;
+ pool_lock(pool);
+ clear_blocks(pool, i, idx, size_to_blocks(hdr->size));
+ if (i < pool->next_non_full)
+ pool->next_non_full = i;
+ pool->free_blocks += size_to_blocks(hdr->size);
pool_unlock(pool);
}
global_read_unlock();
- assert(pool);
- sfree_pool(pool, ptr);
+ if (pool) {
+ sfree_pool(pool, ptr);
+ return;
+ }
+
+ log_err("smalloc: ptr %p not from smalloc pool\n", ptr);
}
-static void *smalloc_pool(struct pool *pool, unsigned int size)
+static void *__smalloc_pool(struct pool *pool, size_t size)
{
- struct mem_hdr *hdr, *prv;
- int did_restart = 0;
- void *ret;
-
- if (!size)
- return NULL;
+ size_t nr_blocks;
+ unsigned int i;
+ unsigned int offset;
+ unsigned int last_idx;
+ void *ret = NULL;
pool_lock(pool);
- if (size > pool->room + sizeof(*hdr))
- goto fail;
- if ((size > pool->largest_block) && pool->largest_block)
- goto fail;
-restart:
- hdr = pool->last;
- prv = NULL;
- do {
- if (combine(pool, prv, hdr))
- hdr = prv;
- if (hdr_free(hdr) && hdr_size(hdr) >= size)
- break;
+ nr_blocks = size_to_blocks(size);
+ if (nr_blocks > pool->free_blocks)
+ goto fail;
- prv = hdr;
- } while ((hdr = hdr_nxt(pool, hdr)) != NULL);
+ i = pool->next_non_full;
+ last_idx = 0;
+ offset = -1U;
+ while (i < pool->nr_blocks) {
+ unsigned int idx;
- if (!hdr)
- goto fail;
+ if (pool->bitmap[i] == -1U) {
+ i++;
+ pool->next_non_full = i;
+ last_idx = 0;
+ continue;
+ }
- /*
- * more room, adjust next header if any
- */
- if (hdr_size(hdr) - size >= 2 * sizeof(*hdr)) {
- struct mem_hdr *nxt = __hdr_nxt(pool, hdr, size);
-
- if (nxt) {
- nxt->size = hdr_size(hdr) - size - sizeof(*hdr);
- if (hdr_size(hdr) == pool->largest_block)
- pool->largest_block = hdr_size(nxt);
- hdr_mark_free(nxt);
- } else
- size = hdr_size(hdr);
- } else
- size = hdr_size(hdr);
-
- if (size == hdr_size(hdr) && size == pool->largest_block)
- pool->largest_block = 0;
+ idx = find_next_zero(pool->bitmap[i], last_idx);
+ if (!blocks_free(pool, i, idx, nr_blocks)) {
+ idx += nr_blocks;
+ if (idx < SMALLOC_BPI)
+ last_idx = idx;
+ else {
+ last_idx = 0;
+ while (idx >= SMALLOC_BPI) {
+ i++;
+ idx -= SMALLOC_BPI;
+ }
+ }
+ continue;
+ }
+ set_blocks(pool, i, idx, nr_blocks);
+ offset = i * SMALLOC_BPL + idx * SMALLOC_BPB;
+ break;
+ }
- /*
- * also clears free bit
- */
- hdr->size = size;
- pool->last = hdr_nxt(pool, hdr);
- if (!pool->last)
- pool->last = pool->map;
- pool->room -= size;
+ if (i < pool->nr_blocks) {
+ pool->free_blocks -= nr_blocks;
+ ret = pool->map + offset;
+ }
+fail:
pool_unlock(pool);
-
- ret = (void *) hdr + sizeof(*hdr);
- memset(ret, 0, size);
return ret;
-fail:
+}
+
+static void *smalloc_pool(struct pool *pool, size_t size)
+{
+ size_t alloc_size = size + sizeof(struct block_hdr);
+ void *ptr;
+
/*
- * if we fail to allocate, first compact the entries that we missed.
- * if that also fails, increase the size of the pool
+ * Round to int alignment, so that the postred pointer will
+ * be naturally aligned as well.
*/
- if (++did_restart <= 1) {
- if (!compact_pool(pool)) {
- pool->last = pool->map;
- goto restart;
- }
+#ifdef SMALLOC_REDZONE
+ alloc_size += sizeof(unsigned int);
+ alloc_size = (alloc_size + int_mask) & ~int_mask;
+#endif
+
+ ptr = __smalloc_pool(pool, alloc_size);
+ if (ptr) {
+ struct block_hdr *hdr = ptr;
+
+ hdr->size = alloc_size;
+ fill_redzone(hdr);
+
+ ptr += sizeof(*hdr);
+ memset(ptr, 0, size);
}
- pool_unlock(pool);
- return NULL;
+
+ return ptr;
}
-void *smalloc(unsigned int size)
+void *smalloc(size_t size)
{
- unsigned int i;
+ unsigned int i, end_pool;
- global_read_lock();
+ if (size != (unsigned int) size)
+ return NULL;
+
+ global_write_lock();
i = last_pool;
+ end_pool = nr_pools;
do {
- for (; i < nr_pools; i++) {
+ for (; i < end_pool; i++) {
void *ptr = smalloc_pool(&mp[i], size);
if (ptr) {
last_pool = i;
- global_read_unlock();
+ global_write_unlock();
return ptr;
}
}
if (last_pool) {
- last_pool = 0;
+ end_pool = last_pool;
+ last_pool = i = 0;
continue;
}
- if (nr_pools + 1 >= MAX_POOLS)
- break;
- else {
- i = nr_pools;
- global_read_unlock();
- if (add_pool(&mp[nr_pools], size))
- goto out;
- global_read_lock();
- }
+ break;
} while (1);
- global_read_unlock();
-out:
+ global_write_unlock();
return NULL;
}
+void *scalloc(size_t nmemb, size_t size)
+{
+ void *ret;
+
+ ret = smalloc(nmemb * size);
+ if (ret)
+ memset(ret, 0, nmemb * size);
+
+ return ret;
+}
+
char *smalloc_strdup(const char *str)
{
- char *ptr;
+ char *ptr = NULL;
ptr = smalloc(strlen(str) + 1);
- strcpy(ptr, str);
+ if (ptr)
+ strcpy(ptr, str);
return ptr;
}
projects / fio.git / blobdiff