11 static void *pinned_mem;
13 void fio_unpin_memory(void)
16 if (munlock(pinned_mem, mlock_size) < 0)
18 munmap(pinned_mem, mlock_size);
23 int fio_pin_memory(void)
25 unsigned long long phys_mem;
31 * Don't allow mlock of more than real_mem-128MB
33 phys_mem = os_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);
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");
47 if (mlock(pinned_mem, mlock_size) < 0) {
49 munmap(pinned_mem, mlock_size);
58 * Setup the buffer area we need for io.
60 int allocate_io_mem(struct thread_data *td)
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);
72 td->orig_buffer = shmat(td->shm_id, NULL, 0);
73 if (td->orig_buffer == (void *) -1) {
76 td->orig_buffer = NULL;
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) {
84 td->orig_buffer = NULL;
92 void free_io_mem(struct thread_data *td)
94 if (td->mem_type == MEM_MALLOC)
95 free(td->orig_buffer);
96 else if (td->mem_type == MEM_SHM) {
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);
104 log_err("Bad memory type %u\n", td->mem_type);
106 td->orig_buffer = NULL;