[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;
			fprintf(f_out, "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->mem_type == MEM_MALLOC)
		td->orig_buffer = malloc(td->orig_buffer_size);
	else if (td->mem_type == MEM_SHM || td->mem_type == MEM_SHMHUGE) {
		int flags = IPC_CREAT | SHM_R | SHM_W;

		if (td->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);
			perror("shmget");
			return 1;
		}

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

		td->hugefd = 0;

		if (td->mem_type == MEM_MMAPHUGE) {
			td->hugefd = open(td->hugefile, O_RDWR|O_CREAT, 0644);

			if (td->hugefd < 0) {
				td_verror(td, errno);
				perror("open huge 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->hugefd, 0);
		if (td->orig_buffer == MAP_FAILED) {
			td_verror(td, errno);
			perror("mmap");
			td->orig_buffer = NULL;
			if (td->hugefd)
				close(td->hugefd);
				
			return 1;
		}
	}

	return 0;
}

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

		shmdt(td->orig_buffer);
		shmctl(td->shm_id, IPC_RMID, &sbuf);
	} else if (td->mem_type == MEM_MMAP || td->mem_type == MEM_MMAPHUGE) {
		munmap(td->orig_buffer, td->orig_buffer_size);
		if (td->mem_type == MEM_MMAPHUGE) {
			close(td->hugefd);
			unlink(td->hugefile);
			free(td->hugefile);
		}
	} else
		log_err("Bad memory type %u\n", td->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;
	37	fprintf(f_out, "fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20);
	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	{
	62	if (td->mem_type == MEM_MALLOC)
	63	td->orig_buffer = malloc(td->orig_buffer_size);
74b025b0 JA	64	else if (td->mem_type == MEM_SHM \|\| td->mem_type == MEM_SHMHUGE) {
	65	int flags = IPC_CREAT \| SHM_R \| SHM_W;
	66
	67	if (td->mem_type == MEM_SHMHUGE)
	68	flags \|= SHM_HUGETLB;
	69
	70	td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
2f9ade3c JA	71	if (td->shm_id < 0) {
	72	td_verror(td, errno);
	73	perror("shmget");
	74	return 1;
	75	}
	76
	77	td->orig_buffer = shmat(td->shm_id, NULL, 0);
	78	if (td->orig_buffer == (void *) -1) {
	79	td_verror(td, errno);
	80	perror("shmat");
	81	td->orig_buffer = NULL;
	82	return 1;
	83	}
d0bdaf49 JA	84	} else if (td->mem_type == MEM_MMAP \|\| td->mem_type == MEM_MMAPHUGE) {
	85	int flags = MAP_PRIVATE;
	86
	87	td->hugefd = 0;
	88
	89	if (td->mem_type == MEM_MMAPHUGE) {
d0bdaf49 JA	90	td->hugefd = open(td->hugefile, O_RDWR\|O_CREAT, 0644);
	91
	92	if (td->hugefd < 0) {
	93	td_verror(td, errno);
	94	perror("open huge file");
	95	td->orig_buffer = NULL;
	96	return 1;
	97	}
	98	} else
	99	flags \|= OS_MAP_ANON;
	100
d0bdaf49	101	td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ \| PROT_WRITE, flags, td->hugefd, 0);
2f9ade3c JA	102	if (td->orig_buffer == MAP_FAILED) {
	103	td_verror(td, errno);
	104	perror("mmap");
	105	td->orig_buffer = NULL;
d0bdaf49 JA	106	if (td->hugefd)
	107	close(td->hugefd);
	108
2f9ade3c JA	109	return 1;
	110	}
	111	}
	112
	113	return 0;
	114	}
	115
	116	void free_io_mem(struct thread_data *td)
	117	{
	118	if (td->mem_type == MEM_MALLOC)
	119	free(td->orig_buffer);
0268b8ba	120	else if (td->mem_type == MEM_SHM \|\| td->mem_type == MEM_SHMHUGE) {
2f9ade3c JA	121	struct shmid_ds sbuf;
	122
	123	shmdt(td->orig_buffer);
	124	shmctl(td->shm_id, IPC_RMID, &sbuf);
d0bdaf49	125	} else if (td->mem_type == MEM_MMAP \|\| td->mem_type == MEM_MMAPHUGE) {
2f9ade3c	126	munmap(td->orig_buffer, td->orig_buffer_size);
d0bdaf49 JA	127	if (td->mem_type == MEM_MMAPHUGE) {
	128	close(td->hugefd);
	129	unlink(td->hugefile);
	130	free(td->hugefile);
	131	}
	132	} else
1e97cce9	133	log_err("Bad memory type %u\n", td->mem_type);
2f9ade3c JA	134
	135	td->orig_buffer = NULL;
	136	}