[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->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, IPC_CREAT | 0600);
		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->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0);
		if (td->orig_buffer == MAP_FAILED) {
			td_verror(td, errno);
			perror("mmap");
			td->orig_buffer = NULL;
			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) {
		struct shmid_ds sbuf;

		shmdt(td->orig_buffer);
		shmctl(td->shm_id, IPC_RMID, &sbuf);
	} else if (td->mem_type == MEM_MMAP)
		munmap(td->orig_buffer, td->orig_buffer_size);
	else
		log_err("Bad memory type %u\n", td->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	#include "os.h"
	10
	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);
	64	else if (td->mem_type == MEM_SHM) {
	65	td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, IPC_CREAT \| 0600);
	66	if (td->shm_id < 0) {
	67	td_verror(td, errno);
	68	perror("shmget");
	69	return 1;
	70	}
	71
	72	td->orig_buffer = shmat(td->shm_id, NULL, 0);
	73	if (td->orig_buffer == (void *) -1) {
	74	td_verror(td, errno);
	75	perror("shmat");
	76	td->orig_buffer = NULL;
	77	return 1;
	78	}
	79	} else if (td->mem_type == MEM_MMAP) {
	80	td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ \| PROT_WRITE, MAP_PRIVATE \| OS_MAP_ANON, 0, 0);
	81	if (td->orig_buffer == MAP_FAILED) {
	82	td_verror(td, errno);
	83	perror("mmap");
	84	td->orig_buffer = NULL;
	85	return 1;
	86	}
	87	}
	88
	89	return 0;
	90	}
	91
	92	void free_io_mem(struct thread_data *td)
	93	{
	94	if (td->mem_type == MEM_MALLOC)
	95	free(td->orig_buffer);
	96	else if (td->mem_type == MEM_SHM) {
	97	struct shmid_ds sbuf;
	98
	99	shmdt(td->orig_buffer);
	100	shmctl(td->shm_id, IPC_RMID, &sbuf);
	101	} else if (td->mem_type == MEM_MMAP)
	102	munmap(td->orig_buffer, td->orig_buffer_size);
	103	else
	104	log_err("Bad memory type %u\n", td->mem_type);
	105
	106	td->orig_buffer = NULL;
	107	}