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 (errno == EINVAL && td->o.mem_type == MEM_SHMHUGE)
69 log_err("fio: check that you have free huge pages and that hugepage-size is correct.\n");
74 td->orig_buffer = shmat(td->shm_id, NULL, 0);
75 if (td->orig_buffer == (void *) -1) {
76 td_verror(td, errno, "shmat");
77 td->orig_buffer = NULL;
84 static int alloc_mem_mmap(struct thread_data *td)
86 int flags = MAP_PRIVATE;
91 td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);
94 td_verror(td, errno, "open mmap file");
95 td->orig_buffer = NULL;
98 if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) {
99 td_verror(td, errno, "truncate mmap file");
100 td->orig_buffer = NULL;
104 flags |= OS_MAP_ANON;
106 td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0);
107 if (td->orig_buffer == MAP_FAILED) {
108 td_verror(td, errno, "mmap");
109 td->orig_buffer = NULL;
112 unlink(td->mmapfile);
121 static int alloc_mem_malloc(struct thread_data *td)
123 td->orig_buffer = malloc(td->orig_buffer_size);
131 * Setup the buffer area we need for io.
133 int allocate_io_mem(struct thread_data *td)
137 if (td->o.mem_type == MEM_MALLOC)
138 ret = alloc_mem_malloc(td);
139 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
140 ret = alloc_mem_shm(td);
141 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
142 ret = alloc_mem_mmap(td);
144 log_err("fio: bad mem type: %d\n", td->o.mem_type);
149 td_verror(td, ENOMEM, "iomem allocation");
154 void free_io_mem(struct thread_data *td)
156 if (td->o.mem_type == MEM_MALLOC)
157 free(td->orig_buffer);
158 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
159 struct shmid_ds sbuf;
161 shmdt(td->orig_buffer);
162 shmctl(td->shm_id, IPC_RMID, &sbuf);
163 } else if (td->o.mem_type == MEM_MMAP ||
164 td->o.mem_type == MEM_MMAPHUGE) {
165 munmap(td->orig_buffer, td->orig_buffer_size);
168 unlink(td->mmapfile);
172 log_err("Bad memory type %u\n", td->o.mem_type);
174 td->orig_buffer = NULL;