13 void fio_unpin_memory(struct thread_data *td)
16 dprint(FD_MEM, "unpinning %llu bytes\n", td->o.lockmem);
17 if (munlock(td->pinned_mem, td->o.lockmem) < 0)
19 munmap(td->pinned_mem, td->o.lockmem);
20 td->pinned_mem = NULL;
24 int fio_pin_memory(struct thread_data *td)
26 unsigned long long phys_mem;
31 dprint(FD_MEM, "pinning %llu bytes\n", td->o.lockmem);
34 * Don't allow mlock of more than real_mem-128MB
36 phys_mem = os_phys_mem();
38 if ((td->o.lockmem + 128 * 1024 * 1024) > phys_mem) {
39 td->o.lockmem = phys_mem - 128 * 1024 * 1024;
40 log_info("fio: limiting mlocked memory to %lluMB\n",
45 td->pinned_mem = mmap(NULL, td->o.lockmem, PROT_READ | PROT_WRITE,
46 MAP_PRIVATE | OS_MAP_ANON, -1, 0);
47 if (td->pinned_mem == MAP_FAILED) {
48 perror("malloc locked mem");
49 td->pinned_mem = NULL;
52 if (mlock(td->pinned_mem, td->o.lockmem) < 0) {
54 munmap(td->pinned_mem, td->o.lockmem);
55 td->pinned_mem = NULL;
62 static int alloc_mem_shm(struct thread_data *td, unsigned int total_mem)
64 int flags = IPC_CREAT | S_IRUSR | S_IWUSR;
66 if (td->o.mem_type == MEM_SHMHUGE) {
67 unsigned long mask = td->o.hugepage_size - 1;
70 total_mem = (total_mem + mask) & ~mask;
73 td->shm_id = shmget(IPC_PRIVATE, total_mem, flags);
74 dprint(FD_MEM, "shmget %u, %d\n", total_mem, td->shm_id);
76 td_verror(td, errno, "shmget");
77 if (geteuid() != 0 && (errno == ENOMEM || errno == EPERM))
78 log_err("fio: you may need to run this job as root\n");
79 if (td->o.mem_type == MEM_SHMHUGE) {
80 if (errno == EINVAL) {
81 log_err("fio: check that you have free huge"
82 " pages and that hugepage-size is"
84 } else if (errno == ENOSYS) {
85 log_err("fio: your system does not appear to"
86 " support huge pages.\n");
87 } else if (errno == ENOMEM) {
88 log_err("fio: no huge pages available, do you"
89 " need to alocate some? See HOWTO.\n");
96 td->orig_buffer = shmat(td->shm_id, NULL, 0);
97 dprint(FD_MEM, "shmat %d, %p\n", td->shm_id, td->orig_buffer);
98 if (td->orig_buffer == (void *) -1) {
99 td_verror(td, errno, "shmat");
100 td->orig_buffer = NULL;
107 static void free_mem_shm(struct thread_data *td)
109 struct shmid_ds sbuf;
111 dprint(FD_MEM, "shmdt/ctl %d %p\n", td->shm_id, td->orig_buffer);
112 shmdt(td->orig_buffer);
113 shmctl(td->shm_id, IPC_RMID, &sbuf);
116 static int alloc_mem_mmap(struct thread_data *td, size_t total_mem)
118 int flags = MAP_PRIVATE;
122 if (td->o.mmapfile) {
123 td->mmapfd = open(td->o.mmapfile, O_RDWR|O_CREAT, 0644);
125 if (td->mmapfd < 0) {
126 td_verror(td, errno, "open mmap file");
127 td->orig_buffer = NULL;
130 if (ftruncate(td->mmapfd, total_mem) < 0) {
131 td_verror(td, errno, "truncate mmap file");
132 td->orig_buffer = NULL;
136 flags |= OS_MAP_ANON;
138 td->orig_buffer = mmap(NULL, total_mem, PROT_READ | PROT_WRITE, flags,
140 dprint(FD_MEM, "mmap %u/%d %p\n", total_mem, td->mmapfd,
142 if (td->orig_buffer == MAP_FAILED) {
143 td_verror(td, errno, "mmap");
144 td->orig_buffer = NULL;
147 unlink(td->o.mmapfile);
156 static void free_mem_mmap(struct thread_data *td, size_t total_mem)
158 dprint(FD_MEM, "munmap %u %p\n", total_mem, td->orig_buffer);
159 munmap(td->orig_buffer, td->orig_buffer_size);
160 if (td->o.mmapfile) {
162 unlink(td->o.mmapfile);
163 free(td->o.mmapfile);
167 static int alloc_mem_malloc(struct thread_data *td, size_t total_mem)
169 td->orig_buffer = malloc(total_mem);
170 dprint(FD_MEM, "malloc %u %p\n", total_mem, td->orig_buffer);
172 return td->orig_buffer == NULL;
175 static void free_mem_malloc(struct thread_data *td)
177 dprint(FD_MEM, "free malloc mem %p\n", td->orig_buffer);
178 free(td->orig_buffer);
182 * Set up the buffer area we need for io.
184 int allocate_io_mem(struct thread_data *td)
189 if (td->io_ops->flags & FIO_NOIO)
192 total_mem = td->orig_buffer_size;
194 if (td->o.odirect || td->o.mem_align ||
195 (td->io_ops->flags & FIO_MEMALIGN)) {
196 total_mem += page_mask;
197 if (td->o.mem_align && td->o.mem_align > page_size)
198 total_mem += td->o.mem_align - page_size;
201 dprint(FD_MEM, "Alloc %lu for buffers\n", (size_t) total_mem);
203 if (td->o.mem_type == MEM_MALLOC)
204 ret = alloc_mem_malloc(td, total_mem);
205 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
206 ret = alloc_mem_shm(td, total_mem);
207 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
208 ret = alloc_mem_mmap(td, total_mem);
210 log_err("fio: bad mem type: %d\n", td->o.mem_type);
215 td_verror(td, ENOMEM, "iomem allocation");
220 void free_io_mem(struct thread_data *td)
222 unsigned int total_mem;
224 total_mem = td->orig_buffer_size;
226 total_mem += page_mask;
228 if (td->o.mem_type == MEM_MALLOC)
230 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
232 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
233 free_mem_mmap(td, total_mem);
235 log_err("Bad memory type %u\n", td->o.mem_type);
237 td->orig_buffer = NULL;
238 td->orig_buffer_size = 0;