[fio.git] / memory.c

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

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