11 extern unsigned long long mlock_size;
12 static void *pinned_mem;
14 void fio_unpin_memory(void)
17 if (munlock(pinned_mem, mlock_size) < 0)
19 munmap(pinned_mem, mlock_size);
24 int fio_pin_memory(void)
26 unsigned long long phys_mem;
32 * Don't allow mlock of more than real_mem-128MB
34 phys_mem = os_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);
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");
48 if (mlock(pinned_mem, mlock_size) < 0) {
50 munmap(pinned_mem, mlock_size);
59 * Setup the buffer area we need for io.
61 int allocate_io_mem(struct thread_data *td)
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);
73 td->orig_buffer = shmat(td->shm_id, NULL, 0);
74 if (td->orig_buffer == (void *) -1) {
77 td->orig_buffer = NULL;
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) {
85 td->orig_buffer = NULL;
93 void free_io_mem(struct thread_data *td)
95 if (td->mem_type == MEM_MALLOC)
96 free(td->orig_buffer);
97 else if (td->mem_type == MEM_SHM) {
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);
105 log_err("Bad memory type %d\n", td->mem_type);
107 td->orig_buffer = NULL;