[fio.git] / smalloc.c

/*
 * simple memory allocator, backed by mmap() so that it hands out memory
 * that can be shared across processes and threads
 */
#include <sys/mman.h>
#include <assert.h>
#include <string.h>
#ifdef CONFIG_VALGRIND_DEV
#include <valgrind/valgrind.h>
#else
#define RUNNING_ON_VALGRIND 0
#define VALGRIND_MALLOCLIKE_BLOCK(addr, size, rzB, is_zeroed) do { } while (0)
#define VALGRIND_FREELIKE_BLOCK(addr, rzB) do { } while (0)
#endif

#include "fio.h"
#include "fio_sem.h"
#include "os/os.h"
#include "smalloc.h"
#include "log.h"

#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	16*1024*1024	/* new pool size */
#define INITIAL_POOLS	8		/* maximum number of pools to setup */

#define MAX_POOLS	16

#define SMALLOC_PRE_RED		0xdeadbeefU
#define SMALLOC_POST_RED	0x5aa55aa5U

unsigned int smalloc_pool_size = INITIAL_SIZE;
#ifdef SMALLOC_REDZONE
static const int int_mask = sizeof(int) - 1;
#endif

struct pool {
	struct fio_sem *lock;			/* protects this pool */
	void *map;				/* map of blocks */
	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;
};

#ifdef SMALLOC_REDZONE
#define REDZONE_SIZE sizeof(unsigned int)
#else
#define REDZONE_SIZE 0
#endif

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 inline int ptr_valid(struct pool *pool, void *ptr)
{
	unsigned int pool_size = pool->nr_blocks * SMALLOC_BPL;

	return (ptr >= pool->map) && (ptr < pool->map + pool_size);
}

static inline size_t size_to_blocks(size_t size)
{
	return (size + SMALLOC_BPB - 1) / SMALLOC_BPB;
}

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))
{

	while (nr_blocks) {
		unsigned int this_blocks, mask;
		unsigned int *map;

		if (pool_idx >= pool->nr_blocks)
			return 0;

		map = &pool->bitmap[pool_idx];

		this_blocks = nr_blocks;
		if (this_blocks + idx > SMALLOC_BPI) {
			this_blocks = SMALLOC_BPI - idx;
			idx = SMALLOC_BPI - this_blocks;
		}

		if (this_blocks == SMALLOC_BPI)
			mask = -1U;
		else
			mask = ((1U << this_blocks) - 1) << idx;

		if (!func(map, mask))
			return 0;

		nr_blocks -= this_blocks;
		idx = 0;
		pool_idx++;
	}

	return 1;
}

static int mask_cmp(unsigned int *map, unsigned int mask)
{
	return !(*map & mask);
}

static int mask_clear(unsigned int *map, unsigned int mask)
{
	assert((*map & mask) == mask);
	*map &= ~mask;
	return 1;
}

static int mask_set(unsigned int *map, unsigned int mask)
{
	assert(!(*map & mask));
	*map |= mask;
	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);
}

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);
}

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 bool add_pool(struct pool *pool, unsigned int alloc_size)
{
	int bitmap_blocks;
	int mmap_flags;
	void *ptr;

	if (nr_pools == MAX_POOLS)
		return false;

#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);

	if (ptr == MAP_FAILED)
		goto out_fail;

	pool->map = ptr;
	pool->bitmap = (unsigned int *)((char *) ptr + (pool->nr_blocks * SMALLOC_BPL));
	memset(pool->bitmap, 0, bitmap_blocks * sizeof(unsigned int));

	pool->lock = fio_sem_init(FIO_SEM_UNLOCKED);
	if (!pool->lock)
		goto out_fail;

	nr_pools++;
	return true;
out_fail:
	log_err("smalloc: failed adding pool\n");
	if (pool->map)
		munmap(pool->map, pool->mmap_size);
	return false;
}

void sinit(void)
{
	bool ret;
	int i;

	for (i = 0; i < INITIAL_POOLS; i++) {
		ret = add_pool(&mp[nr_pools], smalloc_pool_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)
{
	/*
	 * 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_sem_remove(pool->lock);
}

void scleanup(void)
{
	unsigned int i;

	for (i = 0; i < nr_pools; i++)
		cleanup_pool(&mp[i]);
}

#ifdef SMALLOC_REDZONE
static void *postred_ptr(struct block_hdr *hdr)
{
	uintptr_t ptr;

	ptr = (uintptr_t) hdr + hdr->size - sizeof(unsigned int);
	ptr = (uintptr_t) PTR_ALIGN(ptr, int_mask);

	return (void *) ptr;
}

static void fill_redzone(struct block_hdr *hdr)
{
	unsigned int *postred = postred_ptr(hdr);

	/* Let Valgrind fill the red zones. */
	if (RUNNING_ON_VALGRIND)
		return;

	hdr->prered = SMALLOC_PRE_RED;
	*postred = SMALLOC_POST_RED;
}

static void sfree_check_redzone(struct block_hdr *hdr)
{
	unsigned int *postred = postred_ptr(hdr);

	/* Let Valgrind check the red zones. */
	if (RUNNING_ON_VALGRIND)
		return;

	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 block_hdr *hdr;
	unsigned int i, idx;
	unsigned long offset;

	if (!ptr)
		return;

	ptr -= sizeof(*hdr);
	hdr = ptr;

	assert(ptr_valid(pool, ptr));

	sfree_check_redzone(hdr);

	offset = ptr - pool->map;
	i = offset / SMALLOC_BPL;
	idx = (offset % SMALLOC_BPL) / SMALLOC_BPB;

	fio_sem_down(pool->lock);
	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);
	fio_sem_up(pool->lock);
}

void sfree(void *ptr)
{
	struct pool *pool = NULL;
	unsigned int i;

	if (!ptr)
		return;

	for (i = 0; i < nr_pools; i++) {
		if (ptr_valid(&mp[i], ptr)) {
			pool = &mp[i];
			break;
		}
	}

	if (pool) {
		VALGRIND_FREELIKE_BLOCK(ptr, REDZONE_SIZE);
		sfree_pool(pool, ptr);
		return;
	}

	log_err("smalloc: ptr %p not from smalloc pool\n", ptr);
}

static void *__smalloc_pool(struct pool *pool, size_t size)
{
	size_t nr_blocks;
	unsigned int i;
	unsigned int offset;
	unsigned int last_idx;
	void *ret = NULL;

	fio_sem_down(pool->lock);

	nr_blocks = size_to_blocks(size);
	if (nr_blocks > pool->free_blocks)
		goto fail;

	i = pool->next_non_full;
	last_idx = 0;
	offset = -1U;
	while (i < pool->nr_blocks) {
		unsigned int idx;

		if (pool->bitmap[i] == -1U) {
			i++;
			pool->next_non_full = i;
			last_idx = 0;
			continue;
		}

		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;
	}

	if (i < pool->nr_blocks) {
		pool->free_blocks -= nr_blocks;
		ret = pool->map + offset;
	}
fail:
	fio_sem_up(pool->lock);
	return ret;
}

static void *smalloc_pool(struct pool *pool, size_t size)
{
	size_t 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);
	if (ptr) {
		struct block_hdr *hdr = ptr;

		hdr->size = alloc_size;
		fill_redzone(hdr);

		ptr += sizeof(*hdr);
		memset(ptr, 0, size);
	}

	return ptr;
}

static void *__smalloc(size_t size, bool is_zeroed)
{
	unsigned int i, end_pool;

	if (size != (unsigned int) size)
		return NULL;

	i = last_pool;
	end_pool = nr_pools;

	do {
		for (; i < end_pool; i++) {
			void *ptr = smalloc_pool(&mp[i], size);

			if (ptr) {
				last_pool = i;
				VALGRIND_MALLOCLIKE_BLOCK(ptr, size,
							  REDZONE_SIZE,
							  is_zeroed);
				return ptr;
			}
		}
		if (last_pool) {
			end_pool = last_pool;
			last_pool = i = 0;
			continue;
		}

		break;
	} while (1);

	log_err("smalloc: OOM. Consider using --alloc-size to increase the "
		"shared memory available.\n");
	return NULL;
}

void *smalloc(size_t size)
{
	return __smalloc(size, false);
}

void *scalloc(size_t nmemb, size_t size)
{
	return __smalloc(nmemb * size, true);
}

char *smalloc_strdup(const char *str)
{
	char *ptr = NULL;

	ptr = smalloc(strlen(str) + 1);
	if (ptr)
		strcpy(ptr, str);
	return ptr;
}
Commit	Line	Data
	1	/*
	2	* simple memory allocator, backed by mmap() so that it hands out memory
	3	* that can be shared across processes and threads
	4	*/
	5	#include <sys/mman.h>
	6	#include <assert.h>
	7	#include <string.h>
	8	#ifdef CONFIG_VALGRIND_DEV
	9	#include <valgrind/valgrind.h>
	10	#else
	11	#define RUNNING_ON_VALGRIND 0
	12	#define VALGRIND_MALLOCLIKE_BLOCK(addr, size, rzB, is_zeroed) do { } while (0)
	13	#define VALGRIND_FREELIKE_BLOCK(addr, rzB) do { } while (0)
	14	#endif
	15
	16	#include "fio.h"
	17	#include "fio_sem.h"
	18	#include "os/os.h"
	19	#include "smalloc.h"
	20	#include "log.h"
	21
	22	#define SMALLOC_REDZONE /* define to detect memory corruption */
	23
	24	#define SMALLOC_BPB 32 /* block size, bytes-per-bit in bitmap */
	25	#define SMALLOC_BPI (sizeof(unsigned int) * 8)
	26	#define SMALLOC_BPL (SMALLOC_BPB * SMALLOC_BPI)
	27
	28	#define INITIAL_SIZE 1610241024 /* new pool size */
	29	#define INITIAL_POOLS 8 /* maximum number of pools to setup */
	30
	31	#define MAX_POOLS 16
	32
	33	#define SMALLOC_PRE_RED 0xdeadbeefU
	34	#define SMALLOC_POST_RED 0x5aa55aa5U
	35
	36	unsigned int smalloc_pool_size = INITIAL_SIZE;
	37	#ifdef SMALLOC_REDZONE
	38	static const int int_mask = sizeof(int) - 1;
	39	#endif
	40
	41	struct pool {
	42	struct fio_sem lock; / protects this pool */
	43	void map; / map of blocks */
	44	unsigned int bitmap; / blocks free/busy map */
	45	size_t free_blocks; /* free blocks */
	46	size_t nr_blocks; /* total blocks */
	47	size_t next_non_full;
	48	size_t mmap_size;
	49	};
	50
	51	#ifdef SMALLOC_REDZONE
	52	#define REDZONE_SIZE sizeof(unsigned int)
	53	#else
	54	#define REDZONE_SIZE 0
	55	#endif
	56
	57	struct block_hdr {
	58	size_t size;
	59	#ifdef SMALLOC_REDZONE
	60	unsigned int prered;
	61	#endif
	62	};
	63
	64	static struct pool mp[MAX_POOLS];
	65	static unsigned int nr_pools;
	66	static unsigned int last_pool;
	67
	68	static inline int ptr_valid(struct pool pool, void ptr)
	69	{
	70	unsigned int pool_size = pool->nr_blocks * SMALLOC_BPL;
	71
	72	return (ptr >= pool->map) && (ptr < pool->map + pool_size);
	73	}
	74
	75	static inline size_t size_to_blocks(size_t size)
	76	{
	77	return (size + SMALLOC_BPB - 1) / SMALLOC_BPB;
	78	}
	79
	80	static int blocks_iter(struct pool *pool, unsigned int pool_idx,
	81	unsigned int idx, size_t nr_blocks,
	82	int (func)(unsigned int map, unsigned int mask))
	83	{
	84
	85	while (nr_blocks) {
	86	unsigned int this_blocks, mask;
	87	unsigned int *map;
	88
	89	if (pool_idx >= pool->nr_blocks)
	90	return 0;
	91
	92	map = &pool->bitmap[pool_idx];
	93
	94	this_blocks = nr_blocks;
	95	if (this_blocks + idx > SMALLOC_BPI) {
	96	this_blocks = SMALLOC_BPI - idx;
	97	idx = SMALLOC_BPI - this_blocks;
	98	}
	99
	100	if (this_blocks == SMALLOC_BPI)
	101	mask = -1U;
	102	else
	103	mask = ((1U << this_blocks) - 1) << idx;
	104
	105	if (!func(map, mask))
	106	return 0;
	107
	108	nr_blocks -= this_blocks;
	109	idx = 0;
	110	pool_idx++;
	111	}
	112
	113	return 1;
	114	}
	115
	116	static int mask_cmp(unsigned int *map, unsigned int mask)
	117	{
	118	return !(*map & mask);
	119	}
	120
	121	static int mask_clear(unsigned int *map, unsigned int mask)
	122	{
	123	assert((*map & mask) == mask);
	124	*map &= ~mask;
	125	return 1;
	126	}
	127
	128	static int mask_set(unsigned int *map, unsigned int mask)
	129	{
	130	assert(!(*map & mask));
	131	*map \|= mask;
	132	return 1;
	133	}
	134
	135	static int blocks_free(struct pool *pool, unsigned int pool_idx,
	136	unsigned int idx, size_t nr_blocks)
	137	{
	138	return blocks_iter(pool, pool_idx, idx, nr_blocks, mask_cmp);
	139	}
	140
	141	static void set_blocks(struct pool *pool, unsigned int pool_idx,
	142	unsigned int idx, size_t nr_blocks)
	143	{
	144	blocks_iter(pool, pool_idx, idx, nr_blocks, mask_set);
	145	}
	146
	147	static void clear_blocks(struct pool *pool, unsigned int pool_idx,
	148	unsigned int idx, size_t nr_blocks)
	149	{
	150	blocks_iter(pool, pool_idx, idx, nr_blocks, mask_clear);
	151	}
	152
	153	static int find_next_zero(int word, int start)
	154	{
	155	assert(word != -1U);
	156	word >>= start;
	157	return ffz(word) + start;
	158	}
	159
	160	static bool add_pool(struct pool *pool, unsigned int alloc_size)
	161	{
	162	int bitmap_blocks;
	163	int mmap_flags;
	164	void *ptr;
	165
	166	if (nr_pools == MAX_POOLS)
	167	return false;
	168
	169	#ifdef SMALLOC_REDZONE
	170	alloc_size += sizeof(unsigned int);
	171	#endif
	172	alloc_size += sizeof(struct block_hdr);
	173	if (alloc_size < INITIAL_SIZE)
	174	alloc_size = INITIAL_SIZE;
	175
	176	/* round up to nearest full number of blocks */
	177	alloc_size = (alloc_size + SMALLOC_BPL - 1) & ~(SMALLOC_BPL - 1);
	178	bitmap_blocks = alloc_size / SMALLOC_BPL;
	179	alloc_size += bitmap_blocks * sizeof(unsigned int);
	180	pool->mmap_size = alloc_size;
	181
	182	pool->nr_blocks = bitmap_blocks;
	183	pool->free_blocks = bitmap_blocks * SMALLOC_BPB;
	184
	185	mmap_flags = OS_MAP_ANON;
	186	#ifdef CONFIG_ESX
	187	mmap_flags \|= MAP_PRIVATE;
	188	#else
	189	mmap_flags \|= MAP_SHARED;
	190	#endif
	191	ptr = mmap(NULL, alloc_size, PROT_READ\|PROT_WRITE, mmap_flags, -1, 0);
	192
	193	if (ptr == MAP_FAILED)
	194	goto out_fail;
	195
	196	pool->map = ptr;
	197	pool->bitmap = (unsigned int )((char ) ptr + (pool->nr_blocks * SMALLOC_BPL));
	198	memset(pool->bitmap, 0, bitmap_blocks * sizeof(unsigned int));
	199
	200	pool->lock = fio_sem_init(FIO_SEM_UNLOCKED);
	201	if (!pool->lock)
	202	goto out_fail;
	203
	204	nr_pools++;
	205	return true;
	206	out_fail:
	207	log_err("smalloc: failed adding pool\n");
	208	if (pool->map)
	209	munmap(pool->map, pool->mmap_size);
	210	return false;
	211	}
	212
	213	void sinit(void)
	214	{
	215	bool ret;
	216	int i;
	217
	218	for (i = 0; i < INITIAL_POOLS; i++) {
	219	ret = add_pool(&mp[nr_pools], smalloc_pool_size);
	220	if (!ret)
	221	break;
	222	}
	223
	224	/*
	225	* If we added at least one pool, we should be OK for most
	226	* cases.
	227	*/
	228	assert(i);
	229	}
	230
	231	static void cleanup_pool(struct pool *pool)
	232	{
	233	/*
	234	* This will also remove the temporary file we used as a backing
	235	* store, it was already unlinked
	236	*/
	237	munmap(pool->map, pool->mmap_size);
	238
	239	if (pool->lock)
	240	fio_sem_remove(pool->lock);
	241	}
	242
	243	void scleanup(void)
	244	{
	245	unsigned int i;
	246
	247	for (i = 0; i < nr_pools; i++)
	248	cleanup_pool(&mp[i]);
	249	}
	250
	251	#ifdef SMALLOC_REDZONE
	252	static void postred_ptr(struct block_hdr hdr)
	253	{
	254	uintptr_t ptr;
	255
	256	ptr = (uintptr_t) hdr + hdr->size - sizeof(unsigned int);
	257	ptr = (uintptr_t) PTR_ALIGN(ptr, int_mask);
	258
	259	return (void *) ptr;
	260	}
	261
	262	static void fill_redzone(struct block_hdr *hdr)
	263	{
	264	unsigned int *postred = postred_ptr(hdr);
	265
	266	/* Let Valgrind fill the red zones. */
	267	if (RUNNING_ON_VALGRIND)
	268	return;
	269
	270	hdr->prered = SMALLOC_PRE_RED;
	271	*postred = SMALLOC_POST_RED;
	272	}
	273
	274	static void sfree_check_redzone(struct block_hdr *hdr)
	275	{
	276	unsigned int *postred = postred_ptr(hdr);
	277
	278	/* Let Valgrind check the red zones. */
	279	if (RUNNING_ON_VALGRIND)
	280	return;
	281
	282	if (hdr->prered != SMALLOC_PRE_RED) {
	283	log_err("smalloc pre redzone destroyed!\n"
	284	" ptr=%p, prered=%x, expected %x\n",
	285	hdr, hdr->prered, SMALLOC_PRE_RED);
	286	assert(0);
	287	}
	288	if (*postred != SMALLOC_POST_RED) {
	289	log_err("smalloc post redzone destroyed!\n"
	290	" ptr=%p, postred=%x, expected %x\n",
	291	hdr, *postred, SMALLOC_POST_RED);
	292	assert(0);
	293	}
	294	}
	295	#else
	296	static void fill_redzone(struct block_hdr *hdr)
	297	{
	298	}
	299
	300	static void sfree_check_redzone(struct block_hdr *hdr)
	301	{
	302	}
	303	#endif
	304
	305	static void sfree_pool(struct pool pool, void ptr)
	306	{
	307	struct block_hdr *hdr;
	308	unsigned int i, idx;
	309	unsigned long offset;
	310
	311	if (!ptr)
	312	return;
	313
	314	ptr -= sizeof(*hdr);
	315	hdr = ptr;
	316
	317	assert(ptr_valid(pool, ptr));
	318
	319	sfree_check_redzone(hdr);
	320
	321	offset = ptr - pool->map;
	322	i = offset / SMALLOC_BPL;
	323	idx = (offset % SMALLOC_BPL) / SMALLOC_BPB;
	324
	325	fio_sem_down(pool->lock);
	326	clear_blocks(pool, i, idx, size_to_blocks(hdr->size));
	327	if (i < pool->next_non_full)
	328	pool->next_non_full = i;
	329	pool->free_blocks += size_to_blocks(hdr->size);
	330	fio_sem_up(pool->lock);
	331	}
	332
	333	void sfree(void *ptr)
	334	{
	335	struct pool *pool = NULL;
	336	unsigned int i;
	337
	338	if (!ptr)
	339	return;
	340
	341	for (i = 0; i < nr_pools; i++) {
	342	if (ptr_valid(&mp[i], ptr)) {
	343	pool = &mp[i];
	344	break;
	345	}
	346	}
	347
	348	if (pool) {
	349	VALGRIND_FREELIKE_BLOCK(ptr, REDZONE_SIZE);
	350	sfree_pool(pool, ptr);
	351	return;
	352	}
	353
	354	log_err("smalloc: ptr %p not from smalloc pool\n", ptr);
	355	}
	356
	357	static void __smalloc_pool(struct pool pool, size_t size)
	358	{
	359	size_t nr_blocks;
	360	unsigned int i;
	361	unsigned int offset;
	362	unsigned int last_idx;
	363	void *ret = NULL;
	364
	365	fio_sem_down(pool->lock);
	366
	367	nr_blocks = size_to_blocks(size);
	368	if (nr_blocks > pool->free_blocks)
	369	goto fail;
	370
	371	i = pool->next_non_full;
	372	last_idx = 0;
	373	offset = -1U;
	374	while (i < pool->nr_blocks) {
	375	unsigned int idx;
	376
	377	if (pool->bitmap[i] == -1U) {
	378	i++;
	379	pool->next_non_full = i;
	380	last_idx = 0;
	381	continue;
	382	}
	383
	384	idx = find_next_zero(pool->bitmap[i], last_idx);
	385	if (!blocks_free(pool, i, idx, nr_blocks)) {
	386	idx += nr_blocks;
	387	if (idx < SMALLOC_BPI)
	388	last_idx = idx;
	389	else {
	390	last_idx = 0;
	391	while (idx >= SMALLOC_BPI) {
	392	i++;
	393	idx -= SMALLOC_BPI;
	394	}
	395	}
	396	continue;
	397	}
	398	set_blocks(pool, i, idx, nr_blocks);
	399	offset = i * SMALLOC_BPL + idx * SMALLOC_BPB;
	400	break;
	401	}
	402
	403	if (i < pool->nr_blocks) {
	404	pool->free_blocks -= nr_blocks;
	405	ret = pool->map + offset;
	406	}
	407	fail:
	408	fio_sem_up(pool->lock);
	409	return ret;
	410	}
	411
	412	static void smalloc_pool(struct pool pool, size_t size)
	413	{
	414	size_t alloc_size = size + sizeof(struct block_hdr);
	415	void *ptr;
	416
	417	/*
	418	* Round to int alignment, so that the postred pointer will
	419	* be naturally aligned as well.
	420	*/
	421	#ifdef SMALLOC_REDZONE
	422	alloc_size += sizeof(unsigned int);
	423	alloc_size = (alloc_size + int_mask) & ~int_mask;
	424	#endif
	425
	426	ptr = __smalloc_pool(pool, alloc_size);
	427	if (ptr) {
	428	struct block_hdr *hdr = ptr;
	429
	430	hdr->size = alloc_size;
	431	fill_redzone(hdr);
	432
	433	ptr += sizeof(*hdr);
	434	memset(ptr, 0, size);
	435	}
	436
	437	return ptr;
	438	}
	439
	440	static void *__smalloc(size_t size, bool is_zeroed)
	441	{
	442	unsigned int i, end_pool;
	443
	444	if (size != (unsigned int) size)
	445	return NULL;
	446
	447	i = last_pool;
	448	end_pool = nr_pools;
	449
	450	do {
	451	for (; i < end_pool; i++) {
	452	void *ptr = smalloc_pool(&mp[i], size);
	453
	454	if (ptr) {
	455	last_pool = i;
	456	VALGRIND_MALLOCLIKE_BLOCK(ptr, size,
	457	REDZONE_SIZE,
	458	is_zeroed);
	459	return ptr;
	460	}
	461	}
	462	if (last_pool) {
	463	end_pool = last_pool;
	464	last_pool = i = 0;
	465	continue;
	466	}
	467
	468	break;
	469	} while (1);
	470
	471	log_err("smalloc: OOM. Consider using --alloc-size to increase the "
	472	"shared memory available.\n");
	473	return NULL;
	474	}
	475
	476	void *smalloc(size_t size)
	477	{
	478	return __smalloc(size, false);
	479	}
	480
	481	void *scalloc(size_t nmemb, size_t size)
	482	{
	483	return __smalloc(nmemb * size, true);
	484	}
	485
	486	char smalloc_strdup(const char str)
	487	{
	488	char *ptr = NULL;
	489
	490	ptr = smalloc(strlen(str) + 1);
	491	if (ptr)
	492	strcpy(ptr, str);
	493	return ptr;
	494	}