#include <limits.h>
#include "mutex.h"
+#include "arch/arch.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_BPL (SMALLOC_BPB * SMALLOC_BPI)
#define INITIAL_SIZE 1024*1024 /* new pool size */
-#define MAX_POOLS 4 /* maximum number of pools to setup */
+#define MAX_POOLS 128 /* maximum number of pools to setup */
#define SMALLOC_PRE_RED 0xdeadbeefU
#define SMALLOC_POST_RED 0x5aa55aa5U
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;
+ return ffz(word) + start + 1;
}
static int add_pool(struct pool *pool, unsigned int alloc_size)
{
- void *ptr;
int fd, bitmap_blocks;
+ char file[] = "/tmp/.fio_smalloc.XXXXXX";
+ void *ptr;
- strcpy(pool->file, "/tmp/.fio_smalloc.XXXXXX");
- fd = mkstemp(pool->file);
+ fd = mkstemp(file);
if (fd < 0)
goto out_close;
pool->map = ptr;
pool->bitmap = (void *) ptr + (pool->nr_blocks * SMALLOC_BPL);
-#ifdef MP_SAFE
pool->lock = fio_mutex_init(1);
if (!pool->lock)
goto out_unlink;
-#endif
+ /*
+ * Unlink pool file now. It wont get deleted until the fd is closed,
+ * which happens both for cleanup or unexpected quit. This way we
+ * don't leave temp files around in case of a crash.
+ */
+ unlink(file);
pool->fd = fd;
- global_write_lock();
nr_pools++;
- global_write_unlock();
return 0;
out_unlink:
fprintf(stderr, "smalloc: failed adding pool\n");
if (pool->map)
munmap(pool->map, pool->mmap_size);
- unlink(pool->file);
+ unlink(file);
out_close:
- if (fd >= 0)
- close(fd);
+ 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);
+ /*
+ * This will also remove the temporary file we used as a backing
+ * store, it was already unlinked
+ */
close(pool->fd);
munmap(pool->map, pool->mmap_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;
}