[fio.git] / memory.c

/*
 * Memory helpers
 */
#include <unistd.h>
#include <sys/shm.h>
#include <sys/mman.h>

#include "fio.h"

static void *pinned_mem;

void fio_unpin_memory(void)
{
	if (pinned_mem) {
		dprint(FD_MEM, "unpinning %llu bytes\n", mlock_size);
		if (munlock(pinned_mem, mlock_size) < 0)
			perror("munlock");
		munmap(pinned_mem, mlock_size);
		pinned_mem = NULL;
	}
}

int fio_pin_memory(void)
{
	unsigned long long phys_mem;

	if (!mlock_size)
		return 0;

	dprint(FD_MEM, "pinning %llu bytes\n", mlock_size);

	/*
	 * Don't allow mlock of more than real_mem-128MB
	 */
	phys_mem = os_phys_mem();
	if (phys_mem) {
		if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
			mlock_size = phys_mem - 128 * 1024 * 1024;
			log_info("fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20);
		}
	}

	pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0);
	if (pinned_mem == MAP_FAILED) {
		perror("malloc locked mem");
		pinned_mem = NULL;
		return 1;
	}
	if (mlock(pinned_mem, mlock_size) < 0) {
		perror("mlock");
		munmap(pinned_mem, mlock_size);
		pinned_mem = NULL;
		return 1;
	}

	return 0;
}

static int alloc_mem_shm(struct thread_data *td)
{
	int flags = IPC_CREAT | SHM_R | SHM_W;

	if (td->o.mem_type == MEM_SHMHUGE)
		flags |= SHM_HUGETLB;

	td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
	dprint(FD_MEM, "shmget %zu, %d\n", td->orig_buffer_size, td->shm_id);
	if (td->shm_id < 0) {
		td_verror(td, errno, "shmget");
		if (geteuid() != 0 && errno == ENOMEM)
			log_err("fio: you may need to run this job as root\n");
		if (td->o.mem_type == MEM_SHMHUGE) {
			if (errno == EINVAL)
				log_err("fio: check that you have free huge pages and that hugepage-size is correct.\n");
			else if (errno == ENOSYS)
				log_err("fio: your system does not appear to support huge pages.\n");
			else if (errno == ENOMEM)
				log_err("fio: no huge pages available, do you need to alocate some? See HOWTO.\n");
		}
		
		return 1;
	}

	td->orig_buffer = shmat(td->shm_id, NULL, 0);
	dprint(FD_MEM, "shmat %d, %p\n", td->shm_id, td->orig_buffer);
	if (td->orig_buffer == (void *) -1) {
		td_verror(td, errno, "shmat");
		td->orig_buffer = NULL;
		return 1;
	}

	return 0;
}

static int alloc_mem_mmap(struct thread_data *td)
{
	int flags = MAP_PRIVATE;

	td->mmapfd = 0;

	if (td->mmapfile) {
		td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);

		if (td->mmapfd < 0) {
			td_verror(td, errno, "open mmap file");
			td->orig_buffer = NULL;
			return 1;
		}
		if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) {
			td_verror(td, errno, "truncate mmap file");
			td->orig_buffer = NULL;
			return 1;
		}
	} else
		flags |= OS_MAP_ANON;

	td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0);
	dprint(FD_MEM, "mmap %zu/%d %p\n", td->orig_buffer_size, td->mmapfd,
							td->orig_buffer);
	if (td->orig_buffer == MAP_FAILED) {
		td_verror(td, errno, "mmap");
		td->orig_buffer = NULL;
		if (td->mmapfd) {
			close(td->mmapfd);
			unlink(td->mmapfile);
		}
			
		return 1;
	}

	return 0;
}

static int alloc_mem_malloc(struct thread_data *td)
{
	unsigned int bsize = td->orig_buffer_size;

	if (td->o.odirect)
		bsize += page_mask;
		
	td->orig_buffer = malloc(bsize);
	dprint(FD_MEM, "malloc %u %p\n", bsize, td->orig_buffer);
	if (td->orig_buffer)
		return 0;

	return 1;
}

/*
 * Setup the buffer area we need for io.
 */
int allocate_io_mem(struct thread_data *td)
{
	int ret = 0;

	if (td->io_ops->flags & FIO_NOIO)
		return 0;

	if (td->o.mem_type == MEM_MALLOC)
		ret = alloc_mem_malloc(td);
	else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
		ret = alloc_mem_shm(td);
	else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
		ret = alloc_mem_mmap(td);
	else {
		log_err("fio: bad mem type: %d\n", td->o.mem_type);
		ret = 1;
	}

	if (ret)
		td_verror(td, ENOMEM, "iomem allocation");

	return ret;
}

void free_io_mem(struct thread_data *td)
{
	if (td->o.mem_type == MEM_MALLOC) {
		dprint(FD_MEM, "free mem %p\n", td->orig_buffer);
		free(td->orig_buffer);
	} else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
		struct shmid_ds sbuf;

		dprint(FD_MEM, "shmdt/ctl %d %p\n", td->shm_id,td->orig_buffer);
		shmdt(td->orig_buffer);
		shmctl(td->shm_id, IPC_RMID, &sbuf);
	} else if (td->o.mem_type == MEM_MMAP ||
		   td->o.mem_type == MEM_MMAPHUGE) {
		dprint(FD_MEM, "munmap %zu %p\n", td->orig_buffer_size,
							td->orig_buffer);
		munmap(td->orig_buffer, td->orig_buffer_size);
		if (td->mmapfile) {
			close(td->mmapfd);
			unlink(td->mmapfile);
			free(td->mmapfile);
		}
	} else
		log_err("Bad memory type %u\n", td->o.mem_type);

	td->orig_buffer = NULL;
}
Commit	Line	Data
	1	/*
	2	* Memory helpers
	3	*/
	4	#include <unistd.h>
	5	#include <sys/shm.h>
	6	#include <sys/mman.h>
	7
	8	#include "fio.h"
	9
	10	static void *pinned_mem;
	11
	12	void fio_unpin_memory(void)
	13	{
	14	if (pinned_mem) {
	15	dprint(FD_MEM, "unpinning %llu bytes\n", mlock_size);
	16	if (munlock(pinned_mem, mlock_size) < 0)
	17	perror("munlock");
	18	munmap(pinned_mem, mlock_size);
	19	pinned_mem = NULL;
	20	}
	21	}
	22
	23	int fio_pin_memory(void)
	24	{
	25	unsigned long long phys_mem;
	26
	27	if (!mlock_size)
	28	return 0;
	29
	30	dprint(FD_MEM, "pinning %llu bytes\n", mlock_size);
	31
	32	/*
	33	* Don't allow mlock of more than real_mem-128MB
	34	*/
	35	phys_mem = os_phys_mem();
	36	if (phys_mem) {
	37	if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
	38	mlock_size = phys_mem - 128 * 1024 * 1024;
	39	log_info("fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20);
	40	}
	41	}
	42
	43	pinned_mem = mmap(NULL, mlock_size, PROT_READ \| PROT_WRITE, MAP_PRIVATE \| OS_MAP_ANON, 0, 0);
	44	if (pinned_mem == MAP_FAILED) {
	45	perror("malloc locked mem");
	46	pinned_mem = NULL;
	47	return 1;
	48	}
	49	if (mlock(pinned_mem, mlock_size) < 0) {
	50	perror("mlock");
	51	munmap(pinned_mem, mlock_size);
	52	pinned_mem = NULL;
	53	return 1;
	54	}
	55
	56	return 0;
	57	}
	58
	59	static int alloc_mem_shm(struct thread_data *td)
	60	{
	61	int flags = IPC_CREAT \| SHM_R \| SHM_W;
	62
	63	if (td->o.mem_type == MEM_SHMHUGE)
	64	flags \|= SHM_HUGETLB;
	65
	66	td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
	67	dprint(FD_MEM, "shmget %zu, %d\n", td->orig_buffer_size, td->shm_id);
	68	if (td->shm_id < 0) {
	69	td_verror(td, errno, "shmget");
	70	if (geteuid() != 0 && errno == ENOMEM)
	71	log_err("fio: you may need to run this job as root\n");
	72	if (td->o.mem_type == MEM_SHMHUGE) {
	73	if (errno == EINVAL)
	74	log_err("fio: check that you have free huge pages and that hugepage-size is correct.\n");
	75	else if (errno == ENOSYS)
	76	log_err("fio: your system does not appear to support huge pages.\n");
	77	else if (errno == ENOMEM)
	78	log_err("fio: no huge pages available, do you need to alocate some? See HOWTO.\n");
	79	}
	80
	81	return 1;
	82	}
	83
	84	td->orig_buffer = shmat(td->shm_id, NULL, 0);
	85	dprint(FD_MEM, "shmat %d, %p\n", td->shm_id, td->orig_buffer);
	86	if (td->orig_buffer == (void *) -1) {
	87	td_verror(td, errno, "shmat");
	88	td->orig_buffer = NULL;
	89	return 1;
	90	}
	91
	92	return 0;
	93	}
	94
	95	static int alloc_mem_mmap(struct thread_data *td)
	96	{
	97	int flags = MAP_PRIVATE;
	98
	99	td->mmapfd = 0;
	100
	101	if (td->mmapfile) {
	102	td->mmapfd = open(td->mmapfile, O_RDWR\|O_CREAT, 0644);
	103
	104	if (td->mmapfd < 0) {
	105	td_verror(td, errno, "open mmap file");
	106	td->orig_buffer = NULL;
	107	return 1;
	108	}
	109	if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) {
	110	td_verror(td, errno, "truncate mmap file");
	111	td->orig_buffer = NULL;
	112	return 1;
	113	}
	114	} else
	115	flags \|= OS_MAP_ANON;
	116
	117	td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ \| PROT_WRITE, flags, td->mmapfd, 0);
	118	dprint(FD_MEM, "mmap %zu/%d %p\n", td->orig_buffer_size, td->mmapfd,
	119	td->orig_buffer);
	120	if (td->orig_buffer == MAP_FAILED) {
	121	td_verror(td, errno, "mmap");
	122	td->orig_buffer = NULL;
	123	if (td->mmapfd) {
	124	close(td->mmapfd);
	125	unlink(td->mmapfile);
	126	}
	127
	128	return 1;
	129	}
	130
	131	return 0;
	132	}
	133
	134	static int alloc_mem_malloc(struct thread_data *td)
	135	{
	136	unsigned int bsize = td->orig_buffer_size;
	137
	138	if (td->o.odirect)
	139	bsize += page_mask;
	140
	141	td->orig_buffer = malloc(bsize);
	142	dprint(FD_MEM, "malloc %u %p\n", bsize, td->orig_buffer);
	143	if (td->orig_buffer)
	144	return 0;
	145
	146	return 1;
	147	}
	148
	149	/*
	150	* Setup the buffer area we need for io.
	151	*/
	152	int allocate_io_mem(struct thread_data *td)
	153	{
	154	int ret = 0;
	155
	156	if (td->io_ops->flags & FIO_NOIO)
	157	return 0;
	158
	159	if (td->o.mem_type == MEM_MALLOC)
	160	ret = alloc_mem_malloc(td);
	161	else if (td->o.mem_type == MEM_SHM \|\| td->o.mem_type == MEM_SHMHUGE)
	162	ret = alloc_mem_shm(td);
	163	else if (td->o.mem_type == MEM_MMAP \|\| td->o.mem_type == MEM_MMAPHUGE)
	164	ret = alloc_mem_mmap(td);
	165	else {
	166	log_err("fio: bad mem type: %d\n", td->o.mem_type);
	167	ret = 1;
	168	}
	169
	170	if (ret)
	171	td_verror(td, ENOMEM, "iomem allocation");
	172
	173	return ret;
	174	}
	175
	176	void free_io_mem(struct thread_data *td)
	177	{
	178	if (td->o.mem_type == MEM_MALLOC) {
	179	dprint(FD_MEM, "free mem %p\n", td->orig_buffer);
	180	free(td->orig_buffer);
	181	} else if (td->o.mem_type == MEM_SHM \|\| td->o.mem_type == MEM_SHMHUGE) {
	182	struct shmid_ds sbuf;
	183
	184	dprint(FD_MEM, "shmdt/ctl %d %p\n", td->shm_id,td->orig_buffer);
	185	shmdt(td->orig_buffer);
	186	shmctl(td->shm_id, IPC_RMID, &sbuf);
	187	} else if (td->o.mem_type == MEM_MMAP \|\|
	188	td->o.mem_type == MEM_MMAPHUGE) {
	189	dprint(FD_MEM, "munmap %zu %p\n", td->orig_buffer_size,
	190	td->orig_buffer);
	191	munmap(td->orig_buffer, td->orig_buffer_size);
	192	if (td->mmapfile) {
	193	close(td->mmapfd);
	194	unlink(td->mmapfile);
	195	free(td->mmapfile);
	196	}
	197	} else
	198	log_err("Bad memory type %u\n", td->o.mem_type);
	199
	200	td->orig_buffer = NULL;
	201	}