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");
78 td->orig_buffer = shmat(td->shm_id, NULL, 0);
79 if (td->orig_buffer == (void *) -1) {
80 td_verror(td, errno, "shmat");
81 td->orig_buffer = NULL;
88 static int alloc_mem_mmap(struct thread_data *td)
90 int flags = MAP_PRIVATE;
95 td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);
98 td_verror(td, errno, "open mmap file");
99 td->orig_buffer = NULL;
102 if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) {
103 td_verror(td, errno, "truncate mmap file");
104 td->orig_buffer = NULL;
108 flags |= OS_MAP_ANON;
110 td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0);
111 if (td->orig_buffer == MAP_FAILED) {
112 td_verror(td, errno, "mmap");
113 td->orig_buffer = NULL;
116 unlink(td->mmapfile);
125 static int alloc_mem_malloc(struct thread_data *td)
127 td->orig_buffer = malloc(td->orig_buffer_size);
135 * Setup the buffer area we need for io.
137 int allocate_io_mem(struct thread_data *td)
141 if (td->o.mem_type == MEM_MALLOC)
142 ret = alloc_mem_malloc(td);
143 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
144 ret = alloc_mem_shm(td);
145 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
146 ret = alloc_mem_mmap(td);
148 log_err("fio: bad mem type: %d\n", td->o.mem_type);
153 td_verror(td, ENOMEM, "iomem allocation");
158 void free_io_mem(struct thread_data *td)
160 if (td->o.mem_type == MEM_MALLOC)
161 free(td->orig_buffer);
162 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
163 struct shmid_ds sbuf;
165 shmdt(td->orig_buffer);
166 shmctl(td->shm_id, IPC_RMID, &sbuf);
167 } else if (td->o.mem_type == MEM_MMAP ||
168 td->o.mem_type == MEM_MMAPHUGE) {
169 munmap(td->orig_buffer, td->orig_buffer_size);
172 unlink(td->mmapfile);
176 log_err("Bad memory type %u\n", td->o.mem_type);
178 td->orig_buffer = NULL;