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 %lluMiB\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)
66 int flags = IPC_CREAT | SHM_R | SHM_W;
68 if (td->o.mem_type == MEM_SHMHUGE)
71 td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags);
72 dprint(FD_MEM, "shmget %zu, %d\n", td->orig_buffer_size, td->shm_id);
74 td_verror(td, errno, "shmget");
75 if (geteuid() != 0 && errno == ENOMEM)
76 log_err("fio: you may need to run this job as root\n");
77 if (td->o.mem_type == MEM_SHMHUGE) {
78 if (errno == EINVAL) {
79 log_err("fio: check that you have free huge"
80 " pages and that hugepage-size is"
82 } else if (errno == ENOSYS) {
83 log_err("fio: your system does not appear to"
84 " support huge pages.\n");
85 } else if (errno == ENOMEM) {
86 log_err("fio: no huge pages available, do you"
87 " need to alocate some? See HOWTO.\n");
94 td->orig_buffer = shmat(td->shm_id, NULL, 0);
95 dprint(FD_MEM, "shmat %d, %p\n", td->shm_id, td->orig_buffer);
96 if (td->orig_buffer == (void *) -1) {
97 td_verror(td, errno, "shmat");
98 td->orig_buffer = NULL;
105 static int alloc_mem_mmap(struct thread_data *td)
107 int flags = MAP_PRIVATE;
112 td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);
114 if (td->mmapfd < 0) {
115 td_verror(td, errno, "open mmap file");
116 td->orig_buffer = NULL;
119 if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) {
120 td_verror(td, errno, "truncate mmap file");
121 td->orig_buffer = NULL;
125 flags |= OS_MAP_ANON;
127 td->orig_buffer = mmap(NULL, td->orig_buffer_size,
128 PROT_READ | PROT_WRITE, flags, td->mmapfd, 0);
129 dprint(FD_MEM, "mmap %zu/%d %p\n", td->orig_buffer_size, td->mmapfd,
131 if (td->orig_buffer == MAP_FAILED) {
132 td_verror(td, errno, "mmap");
133 td->orig_buffer = NULL;
136 unlink(td->mmapfile);
145 static int alloc_mem_malloc(struct thread_data *td)
147 unsigned int bsize = td->orig_buffer_size;
152 td->orig_buffer = malloc(bsize);
153 dprint(FD_MEM, "malloc %u %p\n", bsize, td->orig_buffer);
161 * Setup the buffer area we need for io.
163 int allocate_io_mem(struct thread_data *td)
167 if (td->io_ops->flags & FIO_NOIO)
170 if (td->o.mem_type == MEM_MALLOC)
171 ret = alloc_mem_malloc(td);
172 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
173 ret = alloc_mem_shm(td);
174 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
175 ret = alloc_mem_mmap(td);
177 log_err("fio: bad mem type: %d\n", td->o.mem_type);
182 td_verror(td, ENOMEM, "iomem allocation");
187 void free_io_mem(struct thread_data *td)
189 if (td->o.mem_type == MEM_MALLOC) {
190 dprint(FD_MEM, "free mem %p\n", td->orig_buffer);
191 free(td->orig_buffer);
192 } else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) {
193 struct shmid_ds sbuf;
195 dprint(FD_MEM, "shmdt/ctl %d %p\n", td->shm_id,
197 shmdt(td->orig_buffer);
198 shmctl(td->shm_id, IPC_RMID, &sbuf);
199 } else if (td->o.mem_type == MEM_MMAP ||
200 td->o.mem_type == MEM_MMAPHUGE) {
201 dprint(FD_MEM, "munmap %zu %p\n", td->orig_buffer_size,
203 munmap(td->orig_buffer, td->orig_buffer_size);
206 unlink(td->mmapfile);
210 log_err("Bad memory type %u\n", td->o.mem_type);
212 td->orig_buffer = NULL;