8 #ifndef FIO_NO_HAVE_SHM_H
15 void fio_unpin_memory(struct thread_data *td)
18 dprint(FD_MEM, "unpinning %llu bytes\n", td->o.lockmem);
19 if (munlock(td->pinned_mem, td->o.lockmem) < 0)
21 munmap(td->pinned_mem, td->o.lockmem);
22 td->pinned_mem = NULL;
26 int fio_pin_memory(struct thread_data *td)
28 unsigned long long phys_mem;
33 dprint(FD_MEM, "pinning %llu bytes\n", td->o.lockmem);
36 * Don't allow mlock of more than real_mem-128MB
38 phys_mem = os_phys_mem();
40 if ((td->o.lockmem + 128 * 1024 * 1024) > phys_mem) {
41 td->o.lockmem = phys_mem - 128 * 1024 * 1024;
42 log_info("fio: limiting mlocked memory to %lluMB\n",
47 td->pinned_mem = mmap(NULL, td->o.lockmem, PROT_READ | PROT_WRITE,
48 MAP_PRIVATE | OS_MAP_ANON, -1, 0);
49 if (td->pinned_mem == MAP_FAILED) {
50 perror("malloc locked mem");
51 td->pinned_mem = NULL;
54 if (mlock(td->pinned_mem, td->o.lockmem) < 0) {
56 munmap(td->pinned_mem, td->o.lockmem);
57 td->pinned_mem = NULL;
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;
124 if (td->o.mem_type == MEM_MMAPHUGE) {
125 unsigned long mask = td->o.hugepage_size - 1;
127 flags |= MAP_HUGETLB;
128 total_mem = (total_mem + mask) & ~mask;
131 if (td->o.mmapfile) {
132 td->mmapfd = open(td->o.mmapfile, O_RDWR|O_CREAT, 0644);
134 if (td->mmapfd < 0) {
135 td_verror(td, errno, "open mmap file");
136 td->orig_buffer = NULL;
139 if (ftruncate(td->mmapfd, total_mem) < 0) {
140 td_verror(td, errno, "truncate mmap file");
141 td->orig_buffer = NULL;
145 flags |= OS_MAP_ANON;
147 td->orig_buffer = mmap(NULL, total_mem, PROT_READ | PROT_WRITE, flags,
149 dprint(FD_MEM, "mmap %u/%d %p\n", total_mem, td->mmapfd,
151 if (td->orig_buffer == MAP_FAILED) {
152 td_verror(td, errno, "mmap");
153 td->orig_buffer = NULL;
156 unlink(td->o.mmapfile);
165 static void free_mem_mmap(struct thread_data *td, size_t total_mem)
167 dprint(FD_MEM, "munmap %u %p\n", total_mem, td->orig_buffer);
168 munmap(td->orig_buffer, td->orig_buffer_size);
169 if (td->o.mmapfile) {
171 unlink(td->o.mmapfile);
172 free(td->o.mmapfile);
176 static int alloc_mem_malloc(struct thread_data *td, size_t total_mem)
178 td->orig_buffer = malloc(total_mem);
179 dprint(FD_MEM, "malloc %u %p\n", total_mem, td->orig_buffer);
181 return td->orig_buffer == NULL;
184 static void free_mem_malloc(struct thread_data *td)
186 dprint(FD_MEM, "free malloc mem %p\n", td->orig_buffer);
187 free(td->orig_buffer);
191 * Set up the buffer area we need for io.
193 int allocate_io_mem(struct thread_data *td)
198 if (td->io_ops->flags & FIO_NOIO)
201 total_mem = td->orig_buffer_size;
203 if (td->o.odirect || td->o.mem_align ||
204 (td->io_ops->flags & FIO_MEMALIGN)) {
205 total_mem += page_mask;
206 if (td->o.mem_align && td->o.mem_align > page_size)
207 total_mem += td->o.mem_align - page_size;
210 dprint(FD_MEM, "Alloc %lu for buffers\n", (size_t) total_mem);
212 if (td->o.mem_type == MEM_MALLOC)
213 ret = alloc_mem_malloc(td, total_mem);
214 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
215 ret = alloc_mem_shm(td, total_mem);
216 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
217 ret = alloc_mem_mmap(td, total_mem);
219 log_err("fio: bad mem type: %d\n", td->o.mem_type);
224 td_verror(td, ENOMEM, "iomem allocation");
229 void free_io_mem(struct thread_data *td)
231 unsigned int total_mem;
233 total_mem = td->orig_buffer_size;
235 total_mem += page_mask;
237 if (td->o.mem_type == MEM_MALLOC)
239 else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
241 else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
242 free_mem_mmap(td, total_mem);
244 log_err("Bad memory type %u\n", td->o.mem_type);
246 td->orig_buffer = NULL;
247 td->orig_buffer_size = 0;