Commit | Line | Data |
---|---|---|
2866c82d | 1 | /* |
da751ca9 JA |
2 | * mmap engine |
3 | * | |
4 | * IO engine that reads/writes from files by doing memcpy to/from | |
5 | * a memory mapped region of the file. | |
2866c82d JA |
6 | * |
7 | */ | |
8 | #include <stdio.h> | |
9 | #include <stdlib.h> | |
10 | #include <unistd.h> | |
11 | #include <errno.h> | |
2866c82d | 12 | #include <sys/mman.h> |
5f350952 JA |
13 | |
14 | #include "../fio.h" | |
4f5af7b2 | 15 | #include "../verify.h" |
2866c82d | 16 | |
ac893112 | 17 | /* |
ff455a04 | 18 | * Limits us to 1GB of mapped files in total |
ac893112 | 19 | */ |
ff455a04 | 20 | #define MMAP_TOTAL_SZ (1 * 1024 * 1024 * 1024UL) |
2866c82d | 21 | |
ac893112 JA |
22 | static unsigned long mmap_map_size; |
23 | static unsigned long mmap_map_mask; | |
2866c82d | 24 | |
ac893112 JA |
25 | static int fio_mmap_file(struct thread_data *td, struct fio_file *f, |
26 | size_t length, off_t off) | |
b5af8293 | 27 | { |
ac893112 JA |
28 | int flags = 0; |
29 | int ret = 0; | |
c97d8369 | 30 | |
b5af8293 JA |
31 | if (td_rw(td)) |
32 | flags = PROT_READ | PROT_WRITE; | |
33 | else if (td_write(td)) { | |
34 | flags = PROT_WRITE; | |
35 | ||
2dc1bbeb | 36 | if (td->o.verify != VERIFY_NONE) |
b5af8293 JA |
37 | flags |= PROT_READ; |
38 | } else | |
39 | flags = PROT_READ; | |
40 | ||
ac893112 JA |
41 | f->mmap_ptr = mmap(NULL, length, flags, MAP_SHARED, f->fd, off); |
42 | if (f->mmap_ptr == MAP_FAILED) { | |
8de43fd2 JA |
43 | int err = errno; |
44 | ||
ac893112 | 45 | f->mmap_ptr = NULL; |
8de43fd2 | 46 | td_verror(td, err, "mmap"); |
b5af8293 JA |
47 | goto err; |
48 | } | |
49 | ||
b5af8293 | 50 | if (!td_random(td)) { |
ac893112 | 51 | if (madvise(f->mmap_ptr, length, MADV_SEQUENTIAL) < 0) { |
b5af8293 JA |
52 | td_verror(td, errno, "madvise"); |
53 | goto err; | |
54 | } | |
55 | } else { | |
ac893112 | 56 | if (madvise(f->mmap_ptr, length, MADV_RANDOM) < 0) { |
b5af8293 JA |
57 | td_verror(td, errno, "madvise"); |
58 | goto err; | |
59 | } | |
60 | } | |
61 | ||
b5af8293 | 62 | err: |
ac893112 | 63 | return ret; |
b5af8293 JA |
64 | } |
65 | ||
ac893112 | 66 | static int fio_mmapio_prep(struct thread_data *td, struct io_u *io_u) |
b5af8293 | 67 | { |
ac893112 JA |
68 | struct fio_file *f = io_u->file; |
69 | int ret = 0; | |
6977bcd0 | 70 | |
ac893112 JA |
71 | if (io_u->buflen > mmap_map_size) { |
72 | log_err("fio: bs too big for mmap engine\n"); | |
73 | ret = EIO; | |
74 | goto err; | |
75 | } | |
76 | ||
77 | if (io_u->offset >= f->mmap_off && | |
78 | io_u->offset + io_u->buflen < f->mmap_off + f->mmap_sz) | |
79 | goto done; | |
6977bcd0 | 80 | |
ac893112 JA |
81 | if (f->mmap_ptr) { |
82 | if (munmap(f->mmap_ptr, f->mmap_sz) < 0) { | |
83 | ret = errno; | |
84 | goto err; | |
85 | } | |
86 | f->mmap_ptr = NULL; | |
b5af8293 | 87 | } |
6977bcd0 | 88 | |
ac893112 JA |
89 | f->mmap_sz = mmap_map_size; |
90 | if (f->mmap_sz > f->io_size) | |
91 | f->mmap_sz = f->io_size; | |
6977bcd0 | 92 | |
ff455a04 | 93 | f->mmap_off = io_u->offset; |
ac893112 JA |
94 | |
95 | ret = fio_mmap_file(td, f, f->mmap_sz, f->mmap_off); | |
96 | done: | |
97 | if (!ret) | |
98 | io_u->mmap_data = f->mmap_ptr + io_u->offset - f->mmap_off - | |
99 | f->file_offset; | |
100 | err: | |
6977bcd0 | 101 | return ret; |
b5af8293 JA |
102 | } |
103 | ||
ac893112 JA |
104 | static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u) |
105 | { | |
106 | struct fio_file *f = io_u->file; | |
107 | ||
108 | fio_ro_check(td, io_u); | |
109 | ||
110 | if (io_u->ddir == DDIR_READ) | |
111 | memcpy(io_u->xfer_buf, io_u->mmap_data, io_u->xfer_buflen); | |
112 | else if (io_u->ddir == DDIR_WRITE) | |
113 | memcpy(io_u->mmap_data, io_u->xfer_buf, io_u->xfer_buflen); | |
5f9099ea | 114 | else if (ddir_sync(io_u->ddir)) { |
ac893112 JA |
115 | if (msync(f->mmap_ptr, f->mmap_sz, MS_SYNC)) { |
116 | io_u->error = errno; | |
117 | td_verror(td, io_u->error, "msync"); | |
118 | } | |
119 | } | |
120 | ||
121 | /* | |
122 | * not really direct, but should drop the pages from the cache | |
123 | */ | |
5f9099ea | 124 | if (td->o.odirect && !ddir_sync(io_u->ddir)) { |
ac893112 JA |
125 | if (msync(io_u->mmap_data, io_u->xfer_buflen, MS_SYNC) < 0) { |
126 | io_u->error = errno; | |
127 | td_verror(td, io_u->error, "msync"); | |
128 | } | |
129 | if (madvise(io_u->mmap_data, io_u->xfer_buflen, MADV_DONTNEED) < 0) { | |
130 | io_u->error = errno; | |
131 | td_verror(td, io_u->error, "madvise"); | |
132 | } | |
133 | } | |
134 | ||
135 | return FIO_Q_COMPLETED; | |
136 | } | |
137 | ||
138 | static int fio_mmapio_init(struct thread_data *td) | |
139 | { | |
140 | unsigned long shift, mask; | |
141 | ||
142 | mmap_map_size = MMAP_TOTAL_SZ / td->o.nr_files; | |
143 | mask = mmap_map_size; | |
144 | shift = 0; | |
145 | do { | |
146 | mask >>= 1; | |
147 | if (!mask) | |
148 | break; | |
149 | shift++; | |
150 | } while (1); | |
151 | ||
152 | mmap_map_mask = 1UL << shift; | |
153 | return 0; | |
154 | } | |
155 | ||
5f350952 | 156 | static struct ioengine_ops ioengine = { |
2866c82d JA |
157 | .name = "mmap", |
158 | .version = FIO_IOOPS_VERSION, | |
ac893112 JA |
159 | .init = fio_mmapio_init, |
160 | .prep = fio_mmapio_prep, | |
2866c82d | 161 | .queue = fio_mmapio_queue, |
ac893112 JA |
162 | .open_file = generic_open_file, |
163 | .close_file = generic_close_file, | |
df9c26b1 | 164 | .get_file_size = generic_get_file_size, |
0263882a | 165 | .flags = FIO_SYNCIO | FIO_NOEXTEND, |
2866c82d | 166 | }; |
5f350952 JA |
167 | |
168 | static void fio_init fio_mmapio_register(void) | |
169 | { | |
170 | register_ioengine(&ioengine); | |
171 | } | |
172 | ||
173 | static void fio_exit fio_mmapio_unregister(void) | |
174 | { | |
175 | unregister_ioengine(&ioengine); | |
176 | } |