[fio.git] / memory.c

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

#include "fio.h"
#include "os.h"

extern unsigned long long mlock_size;
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 %d\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
	11	extern unsigned long long mlock_size;
	12	static void *pinned_mem;
	13
	14	void fio_unpin_memory(void)
	15	{
	16	if (pinned_mem) {
	17	if (munlock(pinned_mem, mlock_size) < 0)
	18	perror("munlock");
	19	munmap(pinned_mem, mlock_size);
	20	pinned_mem = NULL;
	21	}
	22	}
	23
	24	int fio_pin_memory(void)
	25	{
	26	unsigned long long phys_mem;
	27
	28	if (!mlock_size)
	29	return 0;
	30
	31	/*
	32	* Don't allow mlock of more than real_mem-128MB
	33	*/
	34	phys_mem = os_phys_mem();
	35	if (phys_mem) {
	36	if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
	37	mlock_size = phys_mem - 128 * 1024 * 1024;
	38	fprintf(f_out, "fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20);
	39	}
	40	}
	41
	42	pinned_mem = mmap(NULL, mlock_size, PROT_READ \| PROT_WRITE, MAP_PRIVATE \| OS_MAP_ANON, 0, 0);
	43	if (pinned_mem == MAP_FAILED) {
	44	perror("malloc locked mem");
	45	pinned_mem = NULL;
	46	return 1;
	47	}
	48	if (mlock(pinned_mem, mlock_size) < 0) {
	49	perror("mlock");
	50	munmap(pinned_mem, mlock_size);
	51	pinned_mem = NULL;
	52	return 1;
	53	}
	54
	55	return 0;
	56	}
	57
	58	/*
	59	* Setup the buffer area we need for io.
	60	*/
	61	int allocate_io_mem(struct thread_data *td)
	62	{
	63	if (td->mem_type == MEM_MALLOC)
	64	td->orig_buffer = malloc(td->orig_buffer_size);
65	else if (td->mem_type == MEM_SHM) {
66	td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, IPC_CREAT \| 0600);
67	if (td->shm_id < 0) {
68	td_verror(td, errno);
69	perror("shmget");
70	return 1;
71	}
72
73	td->orig_buffer = shmat(td->shm_id, NULL, 0);
74	if (td->orig_buffer == (void *) -1) {
75	td_verror(td, errno);
76	perror("shmat");
77	td->orig_buffer = NULL;
78	return 1;
79	}
80	} else if (td->mem_type == MEM_MMAP) {
81	td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ \| PROT_WRITE, MAP_PRIVATE \| OS_MAP_ANON, 0, 0);
82	if (td->orig_buffer == MAP_FAILED) {
83	td_verror(td, errno);
84	perror("mmap");
85	td->orig_buffer = NULL;
86	return 1;
87	}
88	}
89
90	return 0;
91	}
92
93	void free_io_mem(struct thread_data *td)
94	{
95	if (td->mem_type == MEM_MALLOC)
96	free(td->orig_buffer);
97	else if (td->mem_type == MEM_SHM) {
98	struct shmid_ds sbuf;
99
100	shmdt(td->orig_buffer);
101	shmctl(td->shm_id, IPC_RMID, &sbuf);
102	} else if (td->mem_type == MEM_MMAP)
103	munmap(td->orig_buffer, td->orig_buffer_size);
104	else
105	log_err("Bad memory type %d\n", td->mem_type);
106
107	td->orig_buffer = NULL;
108	}