Commit | Line | Data |
---|---|---|
2f9ade3c JA |
1 | /* |
2 | * Memory helpers | |
3 | */ | |
4 | #include <unistd.h> | |
5 | #include <sys/shm.h> | |
6 | #include <sys/mman.h> | |
7 | ||
8 | #include "fio.h" | |
2f9ade3c | 9 | |
2f9ade3c JA |
10 | static void *pinned_mem; |
11 | ||
12 | void fio_unpin_memory(void) | |
13 | { | |
14 | if (pinned_mem) { | |
ee56ad50 | 15 | dprint(FD_MEM, "unpinning %llu bytes\n", mlock_size); |
2f9ade3c JA |
16 | if (munlock(pinned_mem, mlock_size) < 0) |
17 | perror("munlock"); | |
18 | munmap(pinned_mem, mlock_size); | |
19 | pinned_mem = NULL; | |
20 | } | |
21 | } | |
22 | ||
23 | int fio_pin_memory(void) | |
24 | { | |
25 | unsigned long long phys_mem; | |
26 | ||
27 | if (!mlock_size) | |
28 | return 0; | |
29 | ||
ee56ad50 JA |
30 | dprint(FD_MEM, "pinning %llu bytes\n", mlock_size); |
31 | ||
2f9ade3c JA |
32 | /* |
33 | * Don't allow mlock of more than real_mem-128MB | |
34 | */ | |
35 | phys_mem = os_phys_mem(); | |
36 | if (phys_mem) { | |
37 | if ((mlock_size + 128 * 1024 * 1024) > phys_mem) { | |
38 | mlock_size = phys_mem - 128 * 1024 * 1024; | |
6d86144d | 39 | log_info("fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20); |
2f9ade3c JA |
40 | } |
41 | } | |
42 | ||
43 | pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0); | |
44 | if (pinned_mem == MAP_FAILED) { | |
45 | perror("malloc locked mem"); | |
46 | pinned_mem = NULL; | |
47 | return 1; | |
48 | } | |
49 | if (mlock(pinned_mem, mlock_size) < 0) { | |
50 | perror("mlock"); | |
51 | munmap(pinned_mem, mlock_size); | |
52 | pinned_mem = NULL; | |
53 | return 1; | |
54 | } | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
b6f9676e | 59 | static int alloc_mem_shm(struct thread_data *td) |
2f9ade3c | 60 | { |
b6f9676e JA |
61 | int flags = IPC_CREAT | SHM_R | SHM_W; |
62 | ||
63 | if (td->o.mem_type == MEM_SHMHUGE) | |
64 | flags |= SHM_HUGETLB; | |
65 | ||
66 | td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags); | |
ee56ad50 | 67 | dprint(FD_MEM, "shmget %zu, %d\n", td->orig_buffer_size, td->shm_id); |
b6f9676e JA |
68 | if (td->shm_id < 0) { |
69 | td_verror(td, errno, "shmget"); | |
70 | if (geteuid() != 0 && errno == ENOMEM) | |
71 | log_err("fio: you may need to run this job as root\n"); | |
886b878a | 72 | if (td->o.mem_type == MEM_SHMHUGE) { |
d8602dd0 JA |
73 | if (errno == EINVAL) |
74 | log_err("fio: check that you have free huge pages and that hugepage-size is correct.\n"); | |
75 | else if (errno == ENOSYS) | |
76 | log_err("fio: your system does not appear to support huge pages.\n"); | |
c7173db6 JA |
77 | else if (errno == ENOMEM) |
78 | log_err("fio: no huge pages available, do you need to alocate some? See HOWTO.\n"); | |
d8602dd0 | 79 | } |
b6f9676e JA |
80 | |
81 | return 1; | |
82 | } | |
2f9ade3c | 83 | |
b6f9676e | 84 | td->orig_buffer = shmat(td->shm_id, NULL, 0); |
ee56ad50 | 85 | dprint(FD_MEM, "shmat %d, %p\n", td->shm_id, td->orig_buffer); |
b6f9676e JA |
86 | if (td->orig_buffer == (void *) -1) { |
87 | td_verror(td, errno, "shmat"); | |
88 | td->orig_buffer = NULL; | |
89 | return 1; | |
90 | } | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | static int alloc_mem_mmap(struct thread_data *td) | |
96 | { | |
97 | int flags = MAP_PRIVATE; | |
98 | ||
99 | td->mmapfd = 0; | |
100 | ||
101 | if (td->mmapfile) { | |
102 | td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644); | |
103 | ||
104 | if (td->mmapfd < 0) { | |
105 | td_verror(td, errno, "open mmap file"); | |
2f9ade3c JA |
106 | td->orig_buffer = NULL; |
107 | return 1; | |
108 | } | |
b6f9676e JA |
109 | if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) { |
110 | td_verror(td, errno, "truncate mmap file"); | |
2f9ade3c JA |
111 | td->orig_buffer = NULL; |
112 | return 1; | |
113 | } | |
b6f9676e JA |
114 | } else |
115 | flags |= OS_MAP_ANON; | |
116 | ||
117 | td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0); | |
ee56ad50 JA |
118 | dprint(FD_MEM, "mmap %zu/%d %p\n", td->orig_buffer_size, td->mmapfd, |
119 | td->orig_buffer); | |
b6f9676e JA |
120 | if (td->orig_buffer == MAP_FAILED) { |
121 | td_verror(td, errno, "mmap"); | |
122 | td->orig_buffer = NULL; | |
123 | if (td->mmapfd) { | |
124 | close(td->mmapfd); | |
125 | unlink(td->mmapfile); | |
126 | } | |
127 | ||
128 | return 1; | |
2f9ade3c JA |
129 | } |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
b6f9676e JA |
134 | static int alloc_mem_malloc(struct thread_data *td) |
135 | { | |
d87612ac JA |
136 | unsigned int bsize = td->orig_buffer_size; |
137 | ||
138 | if (td->o.odirect) | |
139 | bsize += page_mask; | |
140 | ||
141 | td->orig_buffer = malloc(bsize); | |
ee56ad50 | 142 | dprint(FD_MEM, "malloc %u %p\n", bsize, td->orig_buffer); |
b6f9676e JA |
143 | if (td->orig_buffer) |
144 | return 0; | |
145 | ||
146 | return 1; | |
147 | } | |
148 | ||
149 | /* | |
150 | * Setup the buffer area we need for io. | |
151 | */ | |
152 | int allocate_io_mem(struct thread_data *td) | |
153 | { | |
154 | int ret = 0; | |
155 | ||
b4c5e1ac JA |
156 | if (td->io_ops->flags & FIO_NOIO) |
157 | return 0; | |
158 | ||
b6f9676e JA |
159 | if (td->o.mem_type == MEM_MALLOC) |
160 | ret = alloc_mem_malloc(td); | |
161 | else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) | |
162 | ret = alloc_mem_shm(td); | |
163 | else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE) | |
164 | ret = alloc_mem_mmap(td); | |
165 | else { | |
166 | log_err("fio: bad mem type: %d\n", td->o.mem_type); | |
167 | ret = 1; | |
168 | } | |
169 | ||
3deb3101 JA |
170 | if (ret) |
171 | td_verror(td, ENOMEM, "iomem allocation"); | |
172 | ||
b6f9676e JA |
173 | return ret; |
174 | } | |
175 | ||
2f9ade3c JA |
176 | void free_io_mem(struct thread_data *td) |
177 | { | |
ee56ad50 JA |
178 | if (td->o.mem_type == MEM_MALLOC) { |
179 | dprint(FD_MEM, "free mem %p\n", td->orig_buffer); | |
2f9ade3c | 180 | free(td->orig_buffer); |
ee56ad50 | 181 | } else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) { |
2f9ade3c JA |
182 | struct shmid_ds sbuf; |
183 | ||
ee56ad50 | 184 | dprint(FD_MEM, "shmdt/ctl %d %p\n", td->shm_id,td->orig_buffer); |
2f9ade3c JA |
185 | shmdt(td->orig_buffer); |
186 | shmctl(td->shm_id, IPC_RMID, &sbuf); | |
2dc1bbeb JA |
187 | } else if (td->o.mem_type == MEM_MMAP || |
188 | td->o.mem_type == MEM_MMAPHUGE) { | |
ee56ad50 JA |
189 | dprint(FD_MEM, "munmap %zu %p\n", td->orig_buffer_size, |
190 | td->orig_buffer); | |
2f9ade3c | 191 | munmap(td->orig_buffer, td->orig_buffer_size); |
313cb206 JA |
192 | if (td->mmapfile) { |
193 | close(td->mmapfd); | |
194 | unlink(td->mmapfile); | |
195 | free(td->mmapfile); | |
d0bdaf49 JA |
196 | } |
197 | } else | |
2dc1bbeb | 198 | log_err("Bad memory type %u\n", td->o.mem_type); |
2f9ade3c JA |
199 | |
200 | td->orig_buffer = NULL; | |
201 | } |