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) { | |
15 | if (munlock(pinned_mem, mlock_size) < 0) | |
16 | perror("munlock"); | |
17 | munmap(pinned_mem, mlock_size); | |
18 | pinned_mem = NULL; | |
19 | } | |
20 | } | |
21 | ||
22 | int fio_pin_memory(void) | |
23 | { | |
24 | unsigned long long phys_mem; | |
25 | ||
26 | if (!mlock_size) | |
27 | return 0; | |
28 | ||
29 | /* | |
30 | * Don't allow mlock of more than real_mem-128MB | |
31 | */ | |
32 | phys_mem = os_phys_mem(); | |
33 | if (phys_mem) { | |
34 | if ((mlock_size + 128 * 1024 * 1024) > phys_mem) { | |
35 | mlock_size = phys_mem - 128 * 1024 * 1024; | |
6d86144d | 36 | log_info("fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20); |
2f9ade3c JA |
37 | } |
38 | } | |
39 | ||
40 | pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0); | |
41 | if (pinned_mem == MAP_FAILED) { | |
42 | perror("malloc locked mem"); | |
43 | pinned_mem = NULL; | |
44 | return 1; | |
45 | } | |
46 | if (mlock(pinned_mem, mlock_size) < 0) { | |
47 | perror("mlock"); | |
48 | munmap(pinned_mem, mlock_size); | |
49 | pinned_mem = NULL; | |
50 | return 1; | |
51 | } | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
56 | /* | |
57 | * Setup the buffer area we need for io. | |
58 | */ | |
59 | int allocate_io_mem(struct thread_data *td) | |
60 | { | |
2dc1bbeb | 61 | if (td->o.mem_type == MEM_MALLOC) |
2f9ade3c | 62 | td->orig_buffer = malloc(td->orig_buffer_size); |
2dc1bbeb | 63 | else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) { |
74b025b0 JA |
64 | int flags = IPC_CREAT | SHM_R | SHM_W; |
65 | ||
2dc1bbeb | 66 | if (td->o.mem_type == MEM_SHMHUGE) |
74b025b0 JA |
67 | flags |= SHM_HUGETLB; |
68 | ||
69 | td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags); | |
2f9ade3c | 70 | if (td->shm_id < 0) { |
e1161c32 | 71 | td_verror(td, errno, "shmget"); |
6b56baf5 JA |
72 | if (geteuid() != 0 && errno == ENOMEM) |
73 | log_err("fio: you may need to run this job as root\n"); | |
d3eb7d7c JA |
74 | if (errno == EINVAL && td->o.mem_type == MEM_SHMHUGE) |
75 | log_err("fio: check that you have free huge pages and that hugepage-size is correct.\n"); | |
6b56baf5 | 76 | |
2f9ade3c JA |
77 | return 1; |
78 | } | |
79 | ||
80 | td->orig_buffer = shmat(td->shm_id, NULL, 0); | |
81 | if (td->orig_buffer == (void *) -1) { | |
e1161c32 | 82 | td_verror(td, errno, "shmat"); |
2f9ade3c JA |
83 | td->orig_buffer = NULL; |
84 | return 1; | |
85 | } | |
2dc1bbeb JA |
86 | } else if (td->o.mem_type == MEM_MMAP || |
87 | td->o.mem_type == MEM_MMAPHUGE) { | |
d0bdaf49 JA |
88 | int flags = MAP_PRIVATE; |
89 | ||
313cb206 | 90 | td->mmapfd = 0; |
d0bdaf49 | 91 | |
313cb206 JA |
92 | if (td->mmapfile) { |
93 | td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644); | |
d0bdaf49 | 94 | |
313cb206 | 95 | if (td->mmapfd < 0) { |
9b33b479 | 96 | td_verror(td, errno, "open mmap file"); |
d0bdaf49 JA |
97 | td->orig_buffer = NULL; |
98 | return 1; | |
99 | } | |
5d4a35e1 JA |
100 | if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) { |
101 | td_verror(td, errno, "truncate mmap file"); | |
102 | td->orig_buffer = NULL; | |
103 | return 1; | |
104 | } | |
d0bdaf49 JA |
105 | } else |
106 | flags |= OS_MAP_ANON; | |
107 | ||
313cb206 | 108 | td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0); |
2f9ade3c | 109 | if (td->orig_buffer == MAP_FAILED) { |
e1161c32 | 110 | td_verror(td, errno, "mmap"); |
2f9ade3c | 111 | td->orig_buffer = NULL; |
313cb206 JA |
112 | if (td->mmapfd) { |
113 | close(td->mmapfd); | |
114 | unlink(td->mmapfile); | |
115 | } | |
d0bdaf49 | 116 | |
2f9ade3c JA |
117 | return 1; |
118 | } | |
119 | } | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | void free_io_mem(struct thread_data *td) | |
125 | { | |
2dc1bbeb | 126 | if (td->o.mem_type == MEM_MALLOC) |
2f9ade3c | 127 | free(td->orig_buffer); |
2dc1bbeb | 128 | else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) { |
2f9ade3c JA |
129 | struct shmid_ds sbuf; |
130 | ||
131 | shmdt(td->orig_buffer); | |
132 | shmctl(td->shm_id, IPC_RMID, &sbuf); | |
2dc1bbeb JA |
133 | } else if (td->o.mem_type == MEM_MMAP || |
134 | td->o.mem_type == MEM_MMAPHUGE) { | |
2f9ade3c | 135 | munmap(td->orig_buffer, td->orig_buffer_size); |
313cb206 JA |
136 | if (td->mmapfile) { |
137 | close(td->mmapfd); | |
138 | unlink(td->mmapfile); | |
139 | free(td->mmapfile); | |
d0bdaf49 JA |
140 | } |
141 | } else | |
2dc1bbeb | 142 | log_err("Bad memory type %u\n", td->o.mem_type); |
2f9ade3c JA |
143 | |
144 | td->orig_buffer = NULL; | |
145 | } |