10 static void *pinned_mem;
12 void fio_unpin_memory(void)
15 dprint(FD_MEM, "unpinning %llu bytes\n", mlock_size);
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;
30 dprint(FD_MEM, "pinning %llu bytes\n", mlock_size);
33 * Don't allow mlock of more than real_mem-128MB
35 phys_mem = os_phys_mem();
37 if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
38 mlock_size = phys_mem - 128 * 1024 * 1024;
39 log_info("fio: limiting mlocked memory to %lluMiB\n",
44 pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE,
45 MAP_PRIVATE | OS_MAP_ANON, 0, 0);
46 if (pinned_mem == MAP_FAILED) {
47 perror("malloc locked mem");
51 if (mlock(pinned_mem, mlock_size) < 0) {
53 munmap(pinned_mem, mlock_size);
61 static int alloc_mem_shm(struct thread_data *td)
63 int flags = IPC_CREAT | SHM_R | SHM_W;
65 if (td->o.mem_type == MEM_SHMHUGE)
68 td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
69 dprint(FD_MEM, "shmget %zu, %d\n", td->orig_buffer_size, td->shm_id);
71 td_verror(td, errno, "shmget");
72 if (geteuid() != 0 && errno == ENOMEM)
73 log_err("fio: you may need to run this job as root\n");
74 if (td->o.mem_type == MEM_SHMHUGE) {
75 if (errno == EINVAL) {
76 log_err("fio: check that you have free huge"
77 " pages and that hugepage-size is"
79 } else if (errno == ENOSYS) {
80 log_err("fio: your system does not appear to"
81 " support huge pages.\n");
82 } else if (errno == ENOMEM) {
83 log_err("fio: no huge pages available, do you"
84 " need to alocate some? See HOWTO.\n");
91 td->orig_buffer = shmat(td->shm_id, NULL, 0);
92 dprint(FD_MEM, "shmat %d, %p\n", td->shm_id, td->orig_buffer);
93 if (td->orig_buffer == (void *) -1) {
94 td_verror(td, errno, "shmat");
95 td->orig_buffer = NULL;
102 static int alloc_mem_mmap(struct thread_data *td)
104 int flags = MAP_PRIVATE;
109 td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);
111 if (td->mmapfd < 0) {
112 td_verror(td, errno, "open mmap file");
113 td->orig_buffer = NULL;
116 if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) {
117 td_verror(td, errno, "truncate mmap file");
118 td->orig_buffer = NULL;
122 flags |= OS_MAP_ANON;
124 td->orig_buffer = mmap(NULL, td->orig_buffer_size,
125 PROT_READ | PROT_WRITE, flags, td->mmapfd, 0);
126 dprint(FD_MEM, "mmap %zu/%d %p\n", td->orig_buffer_size, td->mmapfd,
128 if (td->orig_buffer == MAP_FAILED) {
129 td_verror(td, errno, "mmap");
130 td->orig_buffer = NULL;
133 unlink(td->mmapfile);
142 static int alloc_mem_malloc(struct thread_data *td)
144 unsigned int bsize = td->orig_buffer_size;
149 td->orig_buffer = malloc(bsize);
150 dprint(FD_MEM, "malloc %u %p\n", bsize, td->orig_buffer);
158 * Setup the buffer area we need for io.
160 int allocate_io_mem(struct thread_data *td)
164 if (td->io_ops->flags & FIO_NOIO)
167 if (td->o.mem_type == MEM_MALLOC)
168 ret = alloc_mem_malloc(td);
169 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
170 ret = alloc_mem_shm(td);
171 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
172 ret = alloc_mem_mmap(td);
174 log_err("fio: bad mem type: %d\n", td->o.mem_type);
179 td_verror(td, ENOMEM, "iomem allocation");
184 void free_io_mem(struct thread_data *td)
186 if (td->o.mem_type == MEM_MALLOC) {
187 dprint(FD_MEM, "free mem %p\n", td->orig_buffer);
188 free(td->orig_buffer);
189 } else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
190 struct shmid_ds sbuf;
192 dprint(FD_MEM, "shmdt/ctl %d %p\n", td->shm_id,
194 shmdt(td->orig_buffer);
195 shmctl(td->shm_id, IPC_RMID, &sbuf);
196 } else if (td->o.mem_type == MEM_MMAP ||
197 td->o.mem_type == MEM_MMAPHUGE) {
198 dprint(FD_MEM, "munmap %zu %p\n", td->orig_buffer_size,
200 munmap(td->orig_buffer, td->orig_buffer_size);
203 unlink(td->mmapfile);
207 log_err("Bad memory type %u\n", td->o.mem_type);
209 td->orig_buffer = NULL;