Commit | Line | Data |
---|---|---|
2f9ade3c JA |
1 | /* |
2 | * Memory helpers | |
3 | */ | |
5921e80c JA |
4 | #include <sys/types.h> |
5 | #include <sys/stat.h> | |
6 | #include <fcntl.h> | |
2f9ade3c JA |
7 | #include <unistd.h> |
8 | #include <sys/shm.h> | |
9 | #include <sys/mman.h> | |
10 | ||
11 | #include "fio.h" | |
2f9ade3c | 12 | |
2f9ade3c JA |
13 | static void *pinned_mem; |
14 | ||
15 | void fio_unpin_memory(void) | |
16 | { | |
17 | if (pinned_mem) { | |
ee56ad50 | 18 | dprint(FD_MEM, "unpinning %llu bytes\n", mlock_size); |
2f9ade3c JA |
19 | if (munlock(pinned_mem, mlock_size) < 0) |
20 | perror("munlock"); | |
21 | munmap(pinned_mem, mlock_size); | |
22 | pinned_mem = NULL; | |
23 | } | |
24 | } | |
25 | ||
26 | int fio_pin_memory(void) | |
27 | { | |
28 | unsigned long long phys_mem; | |
29 | ||
30 | if (!mlock_size) | |
31 | return 0; | |
32 | ||
ee56ad50 JA |
33 | dprint(FD_MEM, "pinning %llu bytes\n", mlock_size); |
34 | ||
2f9ade3c JA |
35 | /* |
36 | * Don't allow mlock of more than real_mem-128MB | |
37 | */ | |
38 | phys_mem = os_phys_mem(); | |
39 | if (phys_mem) { | |
40 | if ((mlock_size + 128 * 1024 * 1024) > phys_mem) { | |
41 | mlock_size = phys_mem - 128 * 1024 * 1024; | |
b22989b9 | 42 | log_info("fio: limiting mlocked memory to %lluMB\n", |
5ec10eaa | 43 | mlock_size >> 20); |
2f9ade3c JA |
44 | } |
45 | } | |
46 | ||
5ec10eaa | 47 | pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE, |
a55820db | 48 | MAP_PRIVATE | OS_MAP_ANON, -1, 0); |
2f9ade3c JA |
49 | if (pinned_mem == MAP_FAILED) { |
50 | perror("malloc locked mem"); | |
51 | pinned_mem = NULL; | |
52 | return 1; | |
53 | } | |
54 | if (mlock(pinned_mem, mlock_size) < 0) { | |
55 | perror("mlock"); | |
56 | munmap(pinned_mem, mlock_size); | |
57 | pinned_mem = NULL; | |
58 | return 1; | |
59 | } | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
829a602c | 64 | static int alloc_mem_shm(struct thread_data *td, unsigned int total_mem) |
2f9ade3c | 65 | { |
b6f9676e JA |
66 | int flags = IPC_CREAT | SHM_R | SHM_W; |
67 | ||
a1242a20 JA |
68 | if (td->o.mem_type == MEM_SHMHUGE) { |
69 | unsigned long mask = td->o.hugepage_size - 1; | |
70 | ||
b6f9676e | 71 | flags |= SHM_HUGETLB; |
a1242a20 JA |
72 | total_mem = (total_mem + mask) & ~mask; |
73 | } | |
b6f9676e | 74 | |
829a602c JA |
75 | td->shm_id = shmget(IPC_PRIVATE, total_mem, flags); |
76 | dprint(FD_MEM, "shmget %u, %d\n", total_mem, td->shm_id); | |
b6f9676e JA |
77 | if (td->shm_id < 0) { |
78 | td_verror(td, errno, "shmget"); | |
da7d79b0 | 79 | if (geteuid() != 0 && (errno == ENOMEM || errno == EPERM)) |
b6f9676e | 80 | log_err("fio: you may need to run this job as root\n"); |
886b878a | 81 | if (td->o.mem_type == MEM_SHMHUGE) { |
5ec10eaa JA |
82 | if (errno == EINVAL) { |
83 | log_err("fio: check that you have free huge" | |
84 | " pages and that hugepage-size is" | |
85 | " correct.\n"); | |
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"); | |
92 | } | |
d8602dd0 | 93 | } |
5ec10eaa | 94 | |
b6f9676e JA |
95 | return 1; |
96 | } | |
2f9ade3c | 97 | |
b6f9676e | 98 | td->orig_buffer = shmat(td->shm_id, NULL, 0); |
ee56ad50 | 99 | dprint(FD_MEM, "shmat %d, %p\n", td->shm_id, td->orig_buffer); |
b6f9676e JA |
100 | if (td->orig_buffer == (void *) -1) { |
101 | td_verror(td, errno, "shmat"); | |
102 | td->orig_buffer = NULL; | |
103 | return 1; | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
829a602c JA |
109 | static void free_mem_shm(struct thread_data *td) |
110 | { | |
111 | struct shmid_ds sbuf; | |
112 | ||
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); | |
116 | } | |
117 | ||
118 | static int alloc_mem_mmap(struct thread_data *td, unsigned int total_mem) | |
b6f9676e JA |
119 | { |
120 | int flags = MAP_PRIVATE; | |
121 | ||
a55820db | 122 | td->mmapfd = 1; |
b6f9676e JA |
123 | |
124 | if (td->mmapfile) { | |
125 | td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644); | |
126 | ||
127 | if (td->mmapfd < 0) { | |
128 | td_verror(td, errno, "open mmap file"); | |
2f9ade3c JA |
129 | td->orig_buffer = NULL; |
130 | return 1; | |
131 | } | |
829a602c | 132 | if (ftruncate(td->mmapfd, total_mem) < 0) { |
b6f9676e | 133 | td_verror(td, errno, "truncate mmap file"); |
2f9ade3c JA |
134 | td->orig_buffer = NULL; |
135 | return 1; | |
136 | } | |
b6f9676e JA |
137 | } else |
138 | flags |= OS_MAP_ANON; | |
139 | ||
829a602c JA |
140 | td->orig_buffer = mmap(NULL, total_mem, PROT_READ | PROT_WRITE, flags, |
141 | td->mmapfd, 0); | |
142 | dprint(FD_MEM, "mmap %u/%d %p\n", total_mem, td->mmapfd, | |
143 | td->orig_buffer); | |
b6f9676e JA |
144 | if (td->orig_buffer == MAP_FAILED) { |
145 | td_verror(td, errno, "mmap"); | |
146 | td->orig_buffer = NULL; | |
147 | if (td->mmapfd) { | |
148 | close(td->mmapfd); | |
149 | unlink(td->mmapfile); | |
150 | } | |
5ec10eaa | 151 | |
b6f9676e | 152 | return 1; |
2f9ade3c JA |
153 | } |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
829a602c | 158 | static void free_mem_mmap(struct thread_data *td, unsigned int total_mem) |
b6f9676e | 159 | { |
829a602c JA |
160 | dprint(FD_MEM, "munmap %u %p\n", total_mem, td->orig_buffer); |
161 | munmap(td->orig_buffer, td->orig_buffer_size); | |
162 | if (td->mmapfile) { | |
163 | close(td->mmapfd); | |
164 | unlink(td->mmapfile); | |
165 | free(td->mmapfile); | |
166 | } | |
167 | } | |
d87612ac | 168 | |
829a602c JA |
169 | static int alloc_mem_malloc(struct thread_data *td, unsigned int total_mem) |
170 | { | |
171 | td->orig_buffer = malloc(total_mem); | |
172 | dprint(FD_MEM, "malloc %u %p\n", total_mem, td->orig_buffer); | |
5ec10eaa | 173 | |
829a602c JA |
174 | return td->orig_buffer == NULL; |
175 | } | |
b6f9676e | 176 | |
829a602c JA |
177 | static void free_mem_malloc(struct thread_data *td) |
178 | { | |
179 | dprint(FD_MEM, "free malloc mem %p\n", td->orig_buffer); | |
180 | free(td->orig_buffer); | |
b6f9676e JA |
181 | } |
182 | ||
183 | /* | |
184 | * Setup the buffer area we need for io. | |
185 | */ | |
186 | int allocate_io_mem(struct thread_data *td) | |
187 | { | |
829a602c | 188 | unsigned int total_mem; |
b6f9676e JA |
189 | int ret = 0; |
190 | ||
b4c5e1ac JA |
191 | if (td->io_ops->flags & FIO_NOIO) |
192 | return 0; | |
193 | ||
829a602c | 194 | total_mem = td->orig_buffer_size; |
d529ee19 JA |
195 | |
196 | if (td->o.odirect || td->o.mem_align) { | |
829a602c | 197 | total_mem += page_mask; |
d529ee19 JA |
198 | if (td->o.mem_align && td->o.mem_align > page_size) |
199 | total_mem += td->o.mem_align - page_size; | |
200 | } | |
829a602c | 201 | |
b6f9676e | 202 | if (td->o.mem_type == MEM_MALLOC) |
829a602c | 203 | ret = alloc_mem_malloc(td, total_mem); |
b6f9676e | 204 | else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) |
829a602c | 205 | ret = alloc_mem_shm(td, total_mem); |
b6f9676e | 206 | else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE) |
829a602c | 207 | ret = alloc_mem_mmap(td, total_mem); |
b6f9676e JA |
208 | else { |
209 | log_err("fio: bad mem type: %d\n", td->o.mem_type); | |
210 | ret = 1; | |
211 | } | |
212 | ||
3deb3101 JA |
213 | if (ret) |
214 | td_verror(td, ENOMEM, "iomem allocation"); | |
215 | ||
b6f9676e JA |
216 | return ret; |
217 | } | |
218 | ||
2f9ade3c JA |
219 | void free_io_mem(struct thread_data *td) |
220 | { | |
829a602c JA |
221 | unsigned int total_mem; |
222 | ||
223 | total_mem = td->orig_buffer_size; | |
224 | if (td->o.odirect) | |
225 | total_mem += page_mask; | |
226 | ||
227 | if (td->o.mem_type == MEM_MALLOC) | |
228 | free_mem_malloc(td); | |
229 | else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) | |
230 | free_mem_shm(td); | |
231 | else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE) | |
232 | free_mem_mmap(td, total_mem); | |
233 | else | |
2dc1bbeb | 234 | log_err("Bad memory type %u\n", td->o.mem_type); |
2f9ade3c JA |
235 | |
236 | td->orig_buffer = NULL; | |
829a602c | 237 | td->orig_buffer_size = 0; |
2f9ade3c | 238 | } |