#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"
-#define MP_SAFE /* define to make thread safe */
#define SMALLOC_REDZONE /* define to detect memory corruption */
#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 1024*1024 /* new pool size */
-#define MAX_POOLS 4 /* maximum number of pools to setup */
+#define INITIAL_SIZE 8192*1024 /* new pool size */
+#define MAX_POOLS 128 /* maximum number of pools to setup */
#define SMALLOC_PRE_RED 0xdeadbeefU
#define SMALLOC_POST_RED 0x5aa55aa5U
unsigned int smalloc_pool_size = INITIAL_SIZE;
+const int int_mask = sizeof(int) - 1;
struct pool {
struct fio_mutex *lock; /* protects this pool */
unsigned int free_blocks; /* free blocks */
unsigned int nr_blocks; /* total blocks */
unsigned int next_non_full;
- int fd; /* memory backing fd */
- char file[PATH_MAX]; /* filename for fd */
unsigned int mmap_size;
};
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_mutex_down_read(lock);
}
static inline void global_read_unlock(void)
{
- if (lock)
- fio_mutex_up_read(lock);
+ fio_mutex_up_read(lock);
}
static inline void global_write_lock(void)
{
- if (lock)
- fio_mutex_down_write(lock);
+ fio_mutex_down_write(lock);
}
static inline void global_write_unlock(void)
{
- if (lock)
- fio_mutex_up_write(lock);
+ fio_mutex_up_write(lock);
}
static inline int ptr_valid(struct pool *pool, void *ptr)
blocks_iter(pool, pool_idx, idx, nr_blocks, mask_clear);
}
-static inline int __ffs(int word)
-{
- int r = 0;
-
- if (!(word & 0xffff)) {
- word >>= 16;
- r += 16;
- }
- if (!(word & 0xff)) {
- word >>= 8;
- r += 8;
- }
- if (!(word & 0xf)) {
- word >>= 4;
- r += 4;
- }
- if (!(word & 3)) {
- word >>= 2;
- r += 2;
- }
- if (!(word & 1)) {
- word >>= 1;
- r += 1;
- }
-
- return r;
-}
-
static int find_next_zero(int word, int start)
{
assert(word != -1U);
- word >>= (start + 1);
- return __ffs(~word) + start + 1;
+ word >>= start;
+ return ffz(word) + start;
}
static int add_pool(struct pool *pool, unsigned int alloc_size)
{
+ int bitmap_blocks;
void *ptr;
- int fd, bitmap_blocks;
-
- strcpy(pool->file, "/tmp/.fio_smalloc.XXXXXX");
- fd = mkstemp(pool->file);
- if (fd < 0)
- goto out_close;
#ifdef SMALLOC_REDZONE
alloc_size += sizeof(unsigned int);
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;
- if (ftruncate(fd, alloc_size) < 0)
- goto out_unlink;
-
- ptr = mmap(NULL, alloc_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+ ptr = mmap(NULL, alloc_size, PROT_READ|PROT_WRITE,
+ MAP_SHARED | OS_MAP_ANON, -1, 0);
if (ptr == MAP_FAILED)
- goto out_unlink;
+ goto out_fail;
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
-
- pool->fd = fd;
+ goto out_fail;
- global_write_lock();
nr_pools++;
- global_write_unlock();
return 0;
-out_unlink:
+out_fail:
fprintf(stderr, "smalloc: failed adding pool\n");
if (pool->map)
munmap(pool->map, pool->mmap_size);
- unlink(pool->file);
-out_close:
- if (fd >= 0)
- close(fd);
return 1;
}
{
int ret;
-#ifdef MP_SAFE
lock = fio_mutex_rw_init();
-#endif
ret = add_pool(&mp[0], INITIAL_SIZE);
assert(!ret);
}
static void cleanup_pool(struct pool *pool)
{
- unlink(pool->file);
- close(pool->fd);
+ /*
+ * 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)
}
#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 = (void *) hdr + hdr->size - sizeof(unsigned int);
+ 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 = (void *) hdr + hdr->size - sizeof(unsigned int);
+ unsigned int *postred = postred_ptr(hdr);
if (hdr->prered != SMALLOC_PRE_RED) {
fprintf(stderr, "smalloc pre redzone destroyed!\n");
unsigned int alloc_size = size + sizeof(struct block_hdr);
void *ptr;
+ /*
+ * Round to int alignment, so that the postred pointer will
+ * be naturally aligned as well.
+ */
#ifdef SMALLOC_REDZONE
alloc_size += sizeof(unsigned int);
+ alloc_size = (alloc_size + int_mask) & ~int_mask;
#endif
ptr = __smalloc_pool(pool, alloc_size);
{
unsigned int i;
- global_read_lock();
+ global_write_lock();
i = last_pool;
do {
if (ptr) {
last_pool = i;
- global_read_unlock();
+ global_write_unlock();
return ptr;
}
}
break;
else {
i = nr_pools;
- global_read_unlock();
if (add_pool(&mp[nr_pools], size))
goto out;
- global_read_lock();
}
} while (1);
- global_read_unlock();
out:
+ global_write_unlock();
return NULL;
}
projects / fio.git / blobdiff