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" | |
9 | #include "os.h" | |
10 | ||
2f9ade3c JA |
11 | static void *pinned_mem; |
12 | ||
13 | void fio_unpin_memory(void) | |
14 | { | |
15 | if (pinned_mem) { | |
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 | ||
30 | /* | |
31 | * Don't allow mlock of more than real_mem-128MB | |
32 | */ | |
33 | phys_mem = os_phys_mem(); | |
34 | if (phys_mem) { | |
35 | if ((mlock_size + 128 * 1024 * 1024) > phys_mem) { | |
36 | mlock_size = phys_mem - 128 * 1024 * 1024; | |
6d86144d | 37 | log_info("fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20); |
2f9ade3c JA |
38 | } |
39 | } | |
40 | ||
41 | pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0); | |
42 | if (pinned_mem == MAP_FAILED) { | |
43 | perror("malloc locked mem"); | |
44 | pinned_mem = NULL; | |
45 | return 1; | |
46 | } | |
47 | if (mlock(pinned_mem, mlock_size) < 0) { | |
48 | perror("mlock"); | |
49 | munmap(pinned_mem, mlock_size); | |
50 | pinned_mem = NULL; | |
51 | return 1; | |
52 | } | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
57 | /* | |
58 | * Setup the buffer area we need for io. | |
59 | */ | |
60 | int allocate_io_mem(struct thread_data *td) | |
61 | { | |
2dc1bbeb | 62 | if (td->o.mem_type == MEM_MALLOC) |
2f9ade3c | 63 | td->orig_buffer = malloc(td->orig_buffer_size); |
2dc1bbeb | 64 | else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) { |
74b025b0 JA |
65 | int flags = IPC_CREAT | SHM_R | SHM_W; |
66 | ||
2dc1bbeb | 67 | if (td->o.mem_type == MEM_SHMHUGE) |
74b025b0 JA |
68 | flags |= SHM_HUGETLB; |
69 | ||
70 | td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, flags); | |
2f9ade3c | 71 | if (td->shm_id < 0) { |
e1161c32 | 72 | td_verror(td, errno, "shmget"); |
6b56baf5 JA |
73 | if (geteuid() != 0 && errno == ENOMEM) |
74 | log_err("fio: you may need to run this job as root\n"); | |
75 | ||
2f9ade3c JA |
76 | return 1; |
77 | } | |
78 | ||
79 | td->orig_buffer = shmat(td->shm_id, NULL, 0); | |
80 | if (td->orig_buffer == (void *) -1) { | |
e1161c32 | 81 | td_verror(td, errno, "shmat"); |
2f9ade3c JA |
82 | td->orig_buffer = NULL; |
83 | return 1; | |
84 | } | |
2dc1bbeb JA |
85 | } else if (td->o.mem_type == MEM_MMAP || |
86 | td->o.mem_type == MEM_MMAPHUGE) { | |
d0bdaf49 JA |
87 | int flags = MAP_PRIVATE; |
88 | ||
313cb206 | 89 | td->mmapfd = 0; |
d0bdaf49 | 90 | |
313cb206 JA |
91 | if (td->mmapfile) { |
92 | td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644); | |
d0bdaf49 | 93 | |
313cb206 | 94 | if (td->mmapfd < 0) { |
9b33b479 | 95 | td_verror(td, errno, "open mmap file"); |
d0bdaf49 JA |
96 | td->orig_buffer = NULL; |
97 | return 1; | |
98 | } | |
99 | } else | |
100 | flags |= OS_MAP_ANON; | |
101 | ||
313cb206 | 102 | td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, flags, td->mmapfd, 0); |
2f9ade3c | 103 | if (td->orig_buffer == MAP_FAILED) { |
e1161c32 | 104 | td_verror(td, errno, "mmap"); |
2f9ade3c | 105 | td->orig_buffer = NULL; |
313cb206 JA |
106 | if (td->mmapfd) { |
107 | close(td->mmapfd); | |
108 | unlink(td->mmapfile); | |
109 | } | |
d0bdaf49 | 110 | |
2f9ade3c JA |
111 | return 1; |
112 | } | |
113 | } | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | void free_io_mem(struct thread_data *td) | |
119 | { | |
2dc1bbeb | 120 | if (td->o.mem_type == MEM_MALLOC) |
2f9ade3c | 121 | free(td->orig_buffer); |
2dc1bbeb | 122 | else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE) { |
2f9ade3c JA |
123 | struct shmid_ds sbuf; |
124 | ||
125 | shmdt(td->orig_buffer); | |
126 | shmctl(td->shm_id, IPC_RMID, &sbuf); | |
2dc1bbeb JA |
127 | } else if (td->o.mem_type == MEM_MMAP || |
128 | td->o.mem_type == MEM_MMAPHUGE) { | |
2f9ade3c | 129 | munmap(td->orig_buffer, td->orig_buffer_size); |
313cb206 JA |
130 | if (td->mmapfile) { |
131 | close(td->mmapfd); | |
132 | unlink(td->mmapfile); | |
133 | free(td->mmapfile); | |
d0bdaf49 JA |
134 | } |
135 | } else | |
2dc1bbeb | 136 | log_err("Bad memory type %u\n", td->o.mem_type); |
2f9ade3c JA |
137 | |
138 | td->orig_buffer = NULL; | |
139 | } |