13 static void *pinned_mem;
15 void fio_unpin_memory(void)
18 dprint(FD_MEM, "unpinning %llu bytes\n", mlock_size);
19 if (munlock(pinned_mem, mlock_size) < 0)
21 munmap(pinned_mem, mlock_size);
26 int fio_pin_memory(void)
28 unsigned long long phys_mem;
33 dprint(FD_MEM, "pinning %llu bytes\n", mlock_size);
36 * Don't allow mlock of more than real_mem-128MB
38 phys_mem = os_phys_mem();
40 if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
41 mlock_size = phys_mem - 128 * 1024 * 1024;
42 log_info("fio: limiting mlocked memory to %lluMB\n",
47 pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE,
48 MAP_PRIVATE | OS_MAP_ANON, -1, 0);
49 if (pinned_mem == MAP_FAILED) {
50 perror("malloc locked mem");
54 if (mlock(pinned_mem, mlock_size) < 0) {
56 munmap(pinned_mem, mlock_size);
64 static int alloc_mem_shm(struct thread_data *td, unsigned int total_mem)
66 int flags = IPC_CREAT | S_IRUSR | S_IWUSR;
68 if (td->o.mem_type == MEM_SHMHUGE) {
69 unsigned long mask = td->o.hugepage_size - 1;
72 total_mem = (total_mem + mask) & ~mask;
75 td->shm_id = shmget(IPC_PRIVATE, total_mem, flags);
76 dprint(FD_MEM, "shmget %u, %d\n", total_mem, td->shm_id);
78 td_verror(td, errno, "shmget");
79 if (geteuid() != 0 && (errno == ENOMEM || errno == EPERM))
80 log_err("fio: you may need to run this job as root\n");
81 if (td->o.mem_type == MEM_SHMHUGE) {
82 if (errno == EINVAL) {
83 log_err("fio: check that you have free huge"
84 " pages and that hugepage-size is"
86 } else if (errno == ENOSYS) {
87 log_err("fio: your system does not appear to"
88 " support huge pages.\n");
89 } else if (errno == ENOMEM) {
90 log_err("fio: no huge pages available, do you"
91 " need to alocate some? See HOWTO.\n");
98 td->orig_buffer = shmat(td->shm_id, NULL, 0);
99 dprint(FD_MEM, "shmat %d, %p\n", td->shm_id, td->orig_buffer);
100 if (td->orig_buffer == (void *) -1) {
101 td_verror(td, errno, "shmat");
102 td->orig_buffer = NULL;
109 static void free_mem_shm(struct thread_data *td)
111 struct shmid_ds sbuf;
113 dprint(FD_MEM, "shmdt/ctl %d %p\n", td->shm_id, td->orig_buffer);
114 shmdt(td->orig_buffer);
115 shmctl(td->shm_id, IPC_RMID, &sbuf);
118 static int alloc_mem_mmap(struct thread_data *td, size_t total_mem)
120 int flags = MAP_PRIVATE;
125 td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);
127 if (td->mmapfd < 0) {
128 td_verror(td, errno, "open mmap file");
129 td->orig_buffer = NULL;
132 if (ftruncate(td->mmapfd, total_mem) < 0) {
133 td_verror(td, errno, "truncate mmap file");
134 td->orig_buffer = NULL;
138 flags |= OS_MAP_ANON;
140 td->orig_buffer = mmap(NULL, total_mem, PROT_READ | PROT_WRITE, flags,
142 dprint(FD_MEM, "mmap %u/%d %p\n", total_mem, td->mmapfd,
144 if (td->orig_buffer == MAP_FAILED) {
145 td_verror(td, errno, "mmap");
146 td->orig_buffer = NULL;
149 unlink(td->mmapfile);
158 static void free_mem_mmap(struct thread_data *td, size_t total_mem)
160 dprint(FD_MEM, "munmap %u %p\n", total_mem, td->orig_buffer);
161 munmap(td->orig_buffer, td->orig_buffer_size);
164 unlink(td->mmapfile);
169 static int alloc_mem_malloc(struct thread_data *td, size_t total_mem)
171 td->orig_buffer = malloc(total_mem);
172 dprint(FD_MEM, "malloc %u %p\n", total_mem, td->orig_buffer);
174 return td->orig_buffer == NULL;
177 static void free_mem_malloc(struct thread_data *td)
179 dprint(FD_MEM, "free malloc mem %p\n", td->orig_buffer);
180 free(td->orig_buffer);
184 * Set up the buffer area we need for io.
186 int allocate_io_mem(struct thread_data *td)
191 if (td->io_ops->flags & FIO_NOIO)
194 total_mem = td->orig_buffer_size;
196 if (td->o.odirect || td->o.mem_align ||
197 (td->io_ops->flags & FIO_MEMALIGN)) {
198 total_mem += page_mask;
199 if (td->o.mem_align && td->o.mem_align > page_size)
200 total_mem += td->o.mem_align - page_size;
203 dprint(FD_MEM, "Alloc %lu for buffers\n", (size_t) total_mem);
205 if (td->o.mem_type == MEM_MALLOC)
206 ret = alloc_mem_malloc(td, total_mem);
207 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
208 ret = alloc_mem_shm(td, total_mem);
209 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
210 ret = alloc_mem_mmap(td, total_mem);
212 log_err("fio: bad mem type: %d\n", td->o.mem_type);
217 td_verror(td, ENOMEM, "iomem allocation");
222 void free_io_mem(struct thread_data *td)
224 unsigned int total_mem;
226 total_mem = td->orig_buffer_size;
228 total_mem += page_mask;
230 if (td->o.mem_type == MEM_MALLOC)
232 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
234 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
235 free_mem_mmap(td, total_mem);
237 log_err("Bad memory type %u\n", td->o.mem_type);
239 td->orig_buffer = NULL;
240 td->orig_buffer_size = 0;