[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) {
		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;

	/*
	 * 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;
}

/*
 * Setup the buffer area we need for io.
 */
int allocate_io_mem(struct thread_data *td)
{
	if (td->o.mem_type == MEM_MALLOC)
		td->orig_buffer = malloc(td->orig_buffer_size);
	else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
		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);
		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 (errno == EINVAL && td->o.mem_type == MEM_SHMHUGE)
				log_err("fio: check that you have free huge pages and that hugepage-size is correct.\n");
			
			return 1;
		}

		td->orig_buffer = shmat(td->shm_id, NULL, 0);
		if (td->orig_buffer == (void *) -1) {
			td_verror(td, errno, "shmat");
			td->orig_buffer = NULL;
			return 1;
		}
	} else if (td->o.mem_type == MEM_MMAP ||
		   td->o.mem_type == MEM_MMAPHUGE) {
		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);
		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;
}

void free_io_mem(struct thread_data *td)
{
	if (td->o.mem_type == MEM_MALLOC)
		free(td->orig_buffer);
	else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
		struct shmid_ds sbuf;

		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) {
		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
2f9ade3c JA	1	/*
	2	* Memory helpers
	3	*/
	4	#include <unistd.h>
	5	#include <sys/shm.h>
	6	#include <sys/mman.h>
	7
	8	#include "fio.h"
2f9ade3c	9
2f9ade3c JA	10	static void *pinned_mem;
	11
	12	void fio_unpin_memory(void)
	13	{
	14	if (pinned_mem) {
	15	if (munlock(pinned_mem, mlock_size) < 0)
	16	perror("munlock");
	17	munmap(pinned_mem, mlock_size);
	18	pinned_mem = NULL;
	19	}
	20	}
	21
	22	int fio_pin_memory(void)
	23	{
	24	unsigned long long phys_mem;
	25
	26	if (!mlock_size)
	27	return 0;
	28
	29	/*
	30	* Don't allow mlock of more than real_mem-128MB
	31	*/
	32	phys_mem = os_phys_mem();
	33	if (phys_mem) {
	34	if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
	35	mlock_size = phys_mem - 128 * 1024 * 1024;
6d86144d	36	log_info("fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20);
2f9ade3c JA	37	}
	38	}
	39
	40	pinned_mem = mmap(NULL, mlock_size, PROT_READ \| PROT_WRITE, MAP_PRIVATE \| OS_MAP_ANON, 0, 0);
	41	if (pinned_mem == MAP_FAILED) {
	42	perror("malloc locked mem");
	43	pinned_mem = NULL;
	44	return 1;
	45	}
	46	if (mlock(pinned_mem, mlock_size) < 0) {
	47	perror("mlock");
	48	munmap(pinned_mem, mlock_size);
	49	pinned_mem = NULL;
	50	return 1;
	51	}
	52
	53	return 0;
	54	}
	55
	56	/*
	57	* Setup the buffer area we need for io.
	58	*/
	59	int allocate_io_mem(struct thread_data *td)
	60	{
2dc1bbeb	61	if (td->o.mem_type == MEM_MALLOC)
2f9ade3c	62	td->orig_buffer = malloc(td->orig_buffer_size);
2dc1bbeb	63	else if (td->o.mem_type == MEM_SHM \|\| td->o.mem_type == MEM_SHMHUGE) {
74b025b0 JA	64	int flags = IPC_CREAT \| SHM_R \| SHM_W;
74b025b0 JA	65
2dc1bbeb	66	if (td->o.mem_type == MEM_SHMHUGE)
74b025b0 JA	67	flags \|= SHM_HUGETLB;
	68
	69	td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
2f9ade3c	70	if (td->shm_id < 0) {
e1161c32	71	td_verror(td, errno, "shmget");
6b56baf5 JA	72	if (geteuid() != 0 && errno == ENOMEM)
6b56baf5 JA	73	log_err("fio: you may need to run this job as root\n");
d3eb7d7c JA	74	if (errno == EINVAL && td->o.mem_type == MEM_SHMHUGE)
d3eb7d7c JA	75	log_err("fio: check that you have free huge pages and that hugepage-size is correct.\n");
6b56baf5	76
2f9ade3c JA	77	return 1;
	78	}
	79
	80	td->orig_buffer = shmat(td->shm_id, NULL, 0);
	81	if (td->orig_buffer == (void *) -1) {
e1161c32	82	td_verror(td, errno, "shmat");
2f9ade3c JA	83	td->orig_buffer = NULL;
	84	return 1;
	85	}
2dc1bbeb JA	86	} else if (td->o.mem_type == MEM_MMAP \|\|
2dc1bbeb JA	87	td->o.mem_type == MEM_MMAPHUGE) {
d0bdaf49 JA	88	int flags = MAP_PRIVATE;
d0bdaf49 JA	89
313cb206	90	td->mmapfd = 0;
d0bdaf49	91
313cb206 JA	92	if (td->mmapfile) {
313cb206 JA	93	td->mmapfd = open(td->mmapfile, O_RDWR\|O_CREAT, 0644);
d0bdaf49	94
313cb206	95	if (td->mmapfd < 0) {
9b33b479	96	td_verror(td, errno, "open mmap file");
d0bdaf49 JA	97	td->orig_buffer = NULL;
	98	return 1;
	99	}
5d4a35e1 JA	100	if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) {
	101	td_verror(td, errno, "truncate mmap file");
	102	td->orig_buffer = NULL;
	103	return 1;
	104	}
d0bdaf49 JA	105	} else
	106	flags \|= OS_MAP_ANON;
	107
313cb206	108	td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ \| PROT_WRITE, flags, td->mmapfd, 0);
2f9ade3c	109	if (td->orig_buffer == MAP_FAILED) {
e1161c32	110	td_verror(td, errno, "mmap");
2f9ade3c	111	td->orig_buffer = NULL;
313cb206 JA	112	if (td->mmapfd) {
	113	close(td->mmapfd);
	114	unlink(td->mmapfile);
	115	}
d0bdaf49	116
2f9ade3c JA	117	return 1;
	118	}
	119	}
	120
	121	return 0;
	122	}
	123
	124	void free_io_mem(struct thread_data *td)
	125	{
2dc1bbeb	126	if (td->o.mem_type == MEM_MALLOC)
2f9ade3c	127	free(td->orig_buffer);
2dc1bbeb	128	else if (td->o.mem_type == MEM_SHM \|\| td->o.mem_type == MEM_SHMHUGE) {
2f9ade3c JA	129	struct shmid_ds sbuf;
	130
	131	shmdt(td->orig_buffer);
	132	shmctl(td->shm_id, IPC_RMID, &sbuf);
2dc1bbeb JA	133	} else if (td->o.mem_type == MEM_MMAP \|\|
2dc1bbeb JA	134	td->o.mem_type == MEM_MMAPHUGE) {
2f9ade3c	135	munmap(td->orig_buffer, td->orig_buffer_size);
313cb206 JA	136	if (td->mmapfile) {
	137	close(td->mmapfd);
	138	unlink(td->mmapfile);
	139	free(td->mmapfile);
d0bdaf49 JA	140	}
d0bdaf49 JA	141	} else
2dc1bbeb	142	log_err("Bad memory type %u\n", td->o.mem_type);
2f9ade3c JA	143
	144	td->orig_buffer = NULL;
	145	}