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", mlock_size >> 20);
43 pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0);
44 if (pinned_mem == MAP_FAILED) {
45 perror("malloc locked mem");
49 if (mlock(pinned_mem, mlock_size) < 0) {
51 munmap(pinned_mem, mlock_size);
59 static int alloc_mem_shm(struct thread_data *td)
61 int flags = IPC_CREAT | SHM_R | SHM_W;
63 if (td->o.mem_type == MEM_SHMHUGE)
66 td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
67 dprint(FD_MEM, "shmget %zu, %d\n", td->orig_buffer_size, td->shm_id);
69 td_verror(td, errno, "shmget");
70 if (geteuid() != 0 && errno == ENOMEM)
71 log_err("fio: you may need to run this job as root\n");
72 if (td->o.mem_type == MEM_SHMHUGE) {
74 log_err("fio: check that you have free huge pages and that hugepage-size is correct.\n");
75 else if (errno == ENOSYS)
76 log_err("fio: your system does not appear to support huge pages.\n");
77 else if (errno == ENOMEM)
78 log_err("fio: no huge pages available, do you need to alocate some? See HOWTO.\n");
84 td->orig_buffer = shmat(td->shm_id, NULL, 0);
85 dprint(FD_MEM, "shmat %d, %p\n", td->shm_id, td->orig_buffer);
86 if (td->orig_buffer == (void *) -1) {
87 td_verror(td, errno, "shmat");
88 td->orig_buffer = NULL;
95 static int alloc_mem_mmap(struct thread_data *td)
97 int flags = MAP_PRIVATE;
102 td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);
104 if (td->mmapfd < 0) {
105 td_verror(td, errno, "open mmap file");
106 td->orig_buffer = NULL;
109 if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) {
110 td_verror(td, errno, "truncate mmap file");
111 td->orig_buffer = NULL;
115 flags |= OS_MAP_ANON;
117 td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0);
118 dprint(FD_MEM, "mmap %zu/%d %p\n", td->orig_buffer_size, td->mmapfd,
120 if (td->orig_buffer == MAP_FAILED) {
121 td_verror(td, errno, "mmap");
122 td->orig_buffer = NULL;
125 unlink(td->mmapfile);
134 static int alloc_mem_malloc(struct thread_data *td)
136 unsigned int bsize = td->orig_buffer_size;
141 td->orig_buffer = malloc(bsize);
142 dprint(FD_MEM, "malloc %u %p\n", bsize, td->orig_buffer);
150 * Setup the buffer area we need for io.
152 int allocate_io_mem(struct thread_data *td)
156 if (td->io_ops->flags & FIO_NOIO)
159 if (td->o.mem_type == MEM_MALLOC)
160 ret = alloc_mem_malloc(td);
161 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
162 ret = alloc_mem_shm(td);
163 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
164 ret = alloc_mem_mmap(td);
166 log_err("fio: bad mem type: %d\n", td->o.mem_type);
171 td_verror(td, ENOMEM, "iomem allocation");
176 void free_io_mem(struct thread_data *td)
178 if (td->o.mem_type == MEM_MALLOC) {
179 dprint(FD_MEM, "free mem %p\n", td->orig_buffer);
180 free(td->orig_buffer);
181 } else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
182 struct shmid_ds sbuf;
184 dprint(FD_MEM, "shmdt/ctl %d %p\n", td->shm_id,td->orig_buffer);
185 shmdt(td->orig_buffer);
186 shmctl(td->shm_id, IPC_RMID, &sbuf);
187 } else if (td->o.mem_type == MEM_MMAP ||
188 td->o.mem_type == MEM_MMAPHUGE) {
189 dprint(FD_MEM, "munmap %zu %p\n", td->orig_buffer_size,
191 munmap(td->orig_buffer, td->orig_buffer_size);
194 unlink(td->mmapfile);
198 log_err("Bad memory type %u\n", td->o.mem_type);
200 td->orig_buffer = NULL;