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 log_info("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->o.mem_type == MEM_MALLOC)
63 td->orig_buffer = malloc(td->orig_buffer_size);
64 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
65 int flags = IPC_CREAT | SHM_R | SHM_W;
67 if (td->o.mem_type == MEM_SHMHUGE)
70 td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
72 td_verror(td, errno, "shmget");
73 if (geteuid() != 0 && errno == ENOMEM)
74 log_err("fio: you may need to run this job as root\n");
79 td->orig_buffer = shmat(td->shm_id, NULL, 0);
80 if (td->orig_buffer == (void *) -1) {
81 td_verror(td, errno, "shmat");
82 td->orig_buffer = NULL;
85 } else if (td->o.mem_type == MEM_MMAP ||
86 td->o.mem_type == MEM_MMAPHUGE) {
87 int flags = MAP_PRIVATE;
92 td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);
95 td_verror(td, errno, "open mmap file");
96 td->orig_buffer = NULL;
100 flags |= OS_MAP_ANON;
102 td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0);
103 if (td->orig_buffer == MAP_FAILED) {
104 td_verror(td, errno, "mmap");
105 td->orig_buffer = NULL;
108 unlink(td->mmapfile);
118 void free_io_mem(struct thread_data *td)
120 if (td->o.mem_type == MEM_MALLOC)
121 free(td->orig_buffer);
122 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
123 struct shmid_ds sbuf;
125 shmdt(td->orig_buffer);
126 shmctl(td->shm_id, IPC_RMID, &sbuf);
127 } else if (td->o.mem_type == MEM_MMAP ||
128 td->o.mem_type == MEM_MMAPHUGE) {
129 munmap(td->orig_buffer, td->orig_buffer_size);
132 unlink(td->mmapfile);
136 log_err("Bad memory type %u\n", td->o.mem_type);
138 td->orig_buffer = NULL;