[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");
			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;
			}
		} 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");
2f9ade3c JA	73	return 1;
	74	}
	75
	76	td->orig_buffer = shmat(td->shm_id, NULL, 0);
	77	if (td->orig_buffer == (void *) -1) {
e1161c32	78	td_verror(td, errno, "shmat");
2f9ade3c JA	79	td->orig_buffer = NULL;
	80	return 1;
	81	}
2dc1bbeb JA	82	} else if (td->o.mem_type == MEM_MMAP \|\|
2dc1bbeb JA	83	td->o.mem_type == MEM_MMAPHUGE) {
d0bdaf49 JA	84	int flags = MAP_PRIVATE;
d0bdaf49 JA	85
313cb206	86	td->mmapfd = 0;
d0bdaf49	87
313cb206 JA	88	if (td->mmapfile) {
313cb206 JA	89	td->mmapfd = open(td->mmapfile, O_RDWR\|O_CREAT, 0644);
d0bdaf49	90
313cb206	91	if (td->mmapfd < 0) {
9b33b479	92	td_verror(td, errno, "open mmap file");
d0bdaf49 JA	93	td->orig_buffer = NULL;
	94	return 1;
	95	}
	96	} else
	97	flags \|= OS_MAP_ANON;
	98
313cb206	99	td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ \| PROT_WRITE, flags, td->mmapfd, 0);
2f9ade3c	100	if (td->orig_buffer == MAP_FAILED) {
e1161c32	101	td_verror(td, errno, "mmap");
2f9ade3c	102	td->orig_buffer = NULL;
313cb206 JA	103	if (td->mmapfd) {
	104	close(td->mmapfd);
	105	unlink(td->mmapfile);
	106	}
d0bdaf49	107
2f9ade3c JA	108	return 1;
	109	}
	110	}
	111
	112	return 0;
	113	}
	114
	115	void free_io_mem(struct thread_data *td)
	116	{
2dc1bbeb	117	if (td->o.mem_type == MEM_MALLOC)
2f9ade3c	118	free(td->orig_buffer);
2dc1bbeb	119	else if (td->o.mem_type == MEM_SHM \|\| td->o.mem_type == MEM_SHMHUGE) {
2f9ade3c JA	120	struct shmid_ds sbuf;
	121
	122	shmdt(td->orig_buffer);
	123	shmctl(td->shm_id, IPC_RMID, &sbuf);
2dc1bbeb JA	124	} else if (td->o.mem_type == MEM_MMAP \|\|
2dc1bbeb JA	125	td->o.mem_type == MEM_MMAPHUGE) {
2f9ade3c	126	munmap(td->orig_buffer, td->orig_buffer_size);
313cb206 JA	127	if (td->mmapfile) {
	128	close(td->mmapfd);
	129	unlink(td->mmapfile);
	130	free(td->mmapfile);
d0bdaf49 JA	131	}
d0bdaf49 JA	132	} else
2dc1bbeb	133	log_err("Bad memory type %u\n", td->o.mem_type);
2f9ade3c JA	134
	135	td->orig_buffer = NULL;
	136	}