[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->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
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	}
	84	} else if (td->mem_type == MEM_MMAP) {
	85	td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ \| PROT_WRITE, MAP_PRIVATE \| OS_MAP_ANON, 0, 0);
	86	if (td->orig_buffer == MAP_FAILED) {
	87	td_verror(td, errno);
	88	perror("mmap");
	89	td->orig_buffer = NULL;
	90	return 1;
	91	}
	92	}
	93
	94	return 0;
	95	}
	96
	97	void free_io_mem(struct thread_data *td)
	98	{
	99	if (td->mem_type == MEM_MALLOC)
	100	free(td->orig_buffer);
	101	else if (td->mem_type == MEM_SHM) {
	102	struct shmid_ds sbuf;
	103
	104	shmdt(td->orig_buffer);
	105	shmctl(td->shm_id, IPC_RMID, &sbuf);
	106	} else if (td->mem_type == MEM_MMAP)
	107	munmap(td->orig_buffer, td->orig_buffer_size);
	108	else
1e97cce9	109	log_err("Bad memory type %u\n", td->mem_type);
2f9ade3c JA	110
	111	td->orig_buffer = NULL;
	112	}