10 static void *pinned_mem;
12 void fio_unpin_memory(void)
15 if (munlock(pinned_mem, mlock_size) < 0)
17 munmap(pinned_mem, mlock_size);
22 int fio_pin_memory(void)
24 unsigned long long phys_mem;
30 * Don't allow mlock of more than real_mem-128MB
32 phys_mem = os_phys_mem();
34 if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
35 mlock_size = phys_mem - 128 * 1024 * 1024;
36 log_info("fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20);
40 pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0);
41 if (pinned_mem == MAP_FAILED) {
42 perror("malloc locked mem");
46 if (mlock(pinned_mem, mlock_size) < 0) {
48 munmap(pinned_mem, mlock_size);
56 static int alloc_mem_shm(struct thread_data *td)
58 int flags = IPC_CREAT | SHM_R | SHM_W;
60 if (td->o.mem_type == MEM_SHMHUGE)
63 td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
65 td_verror(td, errno, "shmget");
66 if (geteuid() != 0 && errno == ENOMEM)
67 log_err("fio: you may need to run this job as root\n");
68 if (td->o.mem_type == MEM_SHMHUGE) {
70 log_err("fio: check that you have free huge pages and that hugepage-size is correct.\n");
71 else if (errno == ENOSYS)
72 log_err("fio: your system does not appear to support huge pages.\n");
73 else if (errno == ENOMEM)
74 log_err("fio: no huge pages available, do you need to alocate some? See HOWTO.\n");
80 td->orig_buffer = shmat(td->shm_id, NULL, 0);
81 if (td->orig_buffer == (void *) -1) {
82 td_verror(td, errno, "shmat");
83 td->orig_buffer = NULL;
90 static int alloc_mem_mmap(struct thread_data *td)
92 int flags = MAP_PRIVATE;
97 td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);
100 td_verror(td, errno, "open mmap file");
101 td->orig_buffer = NULL;
104 if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) {
105 td_verror(td, errno, "truncate mmap file");
106 td->orig_buffer = NULL;
110 flags |= OS_MAP_ANON;
112 td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0);
113 if (td->orig_buffer == MAP_FAILED) {
114 td_verror(td, errno, "mmap");
115 td->orig_buffer = NULL;
118 unlink(td->mmapfile);
127 static int alloc_mem_malloc(struct thread_data *td)
129 unsigned int bsize = td->orig_buffer_size;
134 td->orig_buffer = malloc(bsize);
142 * Setup the buffer area we need for io.
144 int allocate_io_mem(struct thread_data *td)
148 if (td->io_ops->flags & FIO_NOIO)
151 if (td->o.mem_type == MEM_MALLOC)
152 ret = alloc_mem_malloc(td);
153 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
154 ret = alloc_mem_shm(td);
155 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
156 ret = alloc_mem_mmap(td);
158 log_err("fio: bad mem type: %d\n", td->o.mem_type);
163 td_verror(td, ENOMEM, "iomem allocation");
168 void free_io_mem(struct thread_data *td)
170 if (td->o.mem_type == MEM_MALLOC)
171 free(td->orig_buffer);
172 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
173 struct shmid_ds sbuf;
175 shmdt(td->orig_buffer);
176 shmctl(td->shm_id, IPC_RMID, &sbuf);
177 } else if (td->o.mem_type == MEM_MMAP ||
178 td->o.mem_type == MEM_MMAPHUGE) {
179 munmap(td->orig_buffer, td->orig_buffer_size);
182 unlink(td->mmapfile);
186 log_err("Bad memory type %u\n", td->o.mem_type);
188 td->orig_buffer = NULL;