Commit | Line | Data |
---|---|---|
fb7b71a3 JA |
1 | /* |
2 | * blktrace support code for fio | |
3 | */ | |
4 | #include <stdio.h> | |
5 | #include <stdlib.h> | |
5e6c2067 JA |
6 | #include <sys/stat.h> |
7 | #include <dirent.h> | |
8c1fdf04 | 8 | |
fb7b71a3 JA |
9 | #include "list.h" |
10 | #include "fio.h" | |
11 | #include "blktrace_api.h" | |
12 | ||
f12b323f | 13 | #define TRACE_FIFO_SIZE 65536 |
e2887563 JA |
14 | |
15 | /* | |
16 | * fifo refill frontend, to avoid reading data in trace sized bites | |
17 | */ | |
18 | static int refill_fifo(struct thread_data *td, struct fifo *fifo, int fd) | |
19 | { | |
20 | char buf[TRACE_FIFO_SIZE]; | |
f12b323f | 21 | unsigned int total; |
e2887563 JA |
22 | int ret; |
23 | ||
f12b323f JA |
24 | total = sizeof(buf); |
25 | if (total > fifo_room(fifo)) | |
26 | total = fifo_room(fifo); | |
e2887563 | 27 | |
f12b323f JA |
28 | ret = read(fd, buf, total); |
29 | if (ret < 0) { | |
30 | td_verror(td, errno, "read blktrace file"); | |
31 | return -1; | |
e2887563 JA |
32 | } |
33 | ||
f12b323f JA |
34 | if (ret > 0) |
35 | ret = fifo_put(fifo, buf, ret); | |
36 | ||
37 | return ret; | |
e2887563 JA |
38 | } |
39 | ||
40 | /* | |
41 | * Retrieve 'len' bytes from the fifo, refilling if necessary. | |
42 | */ | |
43 | static int trace_fifo_get(struct thread_data *td, struct fifo *fifo, int fd, | |
44 | void *buf, unsigned int len) | |
45 | { | |
f12b323f JA |
46 | if (fifo_len(fifo) < len) { |
47 | int ret = refill_fifo(td, fifo, fd); | |
e2887563 | 48 | |
f12b323f JA |
49 | if (ret < 0) |
50 | return ret; | |
51 | } | |
e2887563 JA |
52 | |
53 | return fifo_get(fifo, buf, len); | |
54 | } | |
55 | ||
8c1fdf04 JA |
56 | /* |
57 | * Just discard the pdu by seeking past it. | |
58 | */ | |
f12b323f JA |
59 | static int discard_pdu(struct thread_data *td, struct fifo *fifo, int fd, |
60 | struct blk_io_trace *t) | |
fb7b71a3 JA |
61 | { |
62 | if (t->pdu_len == 0) | |
63 | return 0; | |
64 | ||
f12b323f | 65 | return trace_fifo_get(td, fifo, fd, NULL, t->pdu_len); |
fb7b71a3 JA |
66 | } |
67 | ||
8c1fdf04 JA |
68 | /* |
69 | * Check if this is a blktrace binary data file. We read a single trace | |
70 | * into memory and check for the magic signature. | |
71 | */ | |
fb7b71a3 JA |
72 | int is_blktrace(const char *filename) |
73 | { | |
74 | struct blk_io_trace t; | |
75 | int fd, ret; | |
76 | ||
77 | fd = open(filename, O_RDONLY); | |
4dced407 | 78 | if (fd < 0) |
fb7b71a3 | 79 | return 0; |
fb7b71a3 JA |
80 | |
81 | ret = read(fd, &t, sizeof(t)); | |
82 | close(fd); | |
83 | ||
84 | if (ret < 0) { | |
85 | perror("read blktrace"); | |
86 | return 0; | |
87 | } else if (ret != sizeof(t)) { | |
88 | log_err("fio: short read on blktrace file\n"); | |
89 | return 0; | |
90 | } | |
91 | ||
92 | if ((t.magic & 0xffffff00) == BLK_IO_TRACE_MAGIC) | |
93 | return 1; | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
5e6c2067 JA |
98 | static int lookup_device(char *path, unsigned int maj, unsigned int min) |
99 | { | |
100 | struct dirent *dir; | |
101 | struct stat st; | |
102 | int found = 0; | |
103 | DIR *D; | |
104 | ||
105 | D = opendir(path); | |
106 | if (!D) | |
107 | return 0; | |
108 | ||
109 | while ((dir = readdir(D)) != NULL) { | |
110 | char full_path[256]; | |
111 | ||
112 | if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, "..")) | |
113 | continue; | |
114 | ||
115 | sprintf(full_path, "%s/%s", path, dir->d_name); | |
116 | if (lstat(full_path, &st) == -1) { | |
117 | perror("lstat"); | |
118 | break; | |
119 | } | |
120 | ||
121 | if (S_ISDIR(st.st_mode)) { | |
122 | found = lookup_device(full_path, maj, min); | |
123 | if (found) { | |
124 | strcpy(path, full_path); | |
125 | break; | |
126 | } | |
127 | } | |
128 | ||
129 | if (!S_ISBLK(st.st_mode)) | |
130 | continue; | |
131 | ||
132 | if (maj == major(st.st_rdev) && min == minor(st.st_rdev)) { | |
133 | strcpy(path, full_path); | |
134 | found = 1; | |
135 | break; | |
136 | } | |
137 | } | |
138 | ||
139 | closedir(D); | |
140 | return found; | |
141 | } | |
142 | ||
c69aa91f JA |
143 | #define FMINORBITS 20 |
144 | #define FMINORMASK ((1U << FMINORBITS) - 1) | |
145 | #define FMAJOR(dev) ((unsigned int) ((dev) >> FMINORBITS)) | |
146 | #define FMINOR(dev) ((unsigned int) ((dev) & FMINORMASK)) | |
eeb9c2aa | 147 | |
5e6c2067 JA |
148 | static void trace_add_file(struct thread_data *td, __u32 device) |
149 | { | |
150 | static unsigned int last_maj, last_min; | |
c69aa91f JA |
151 | unsigned int maj = FMAJOR(device); |
152 | unsigned int min = FMINOR(device); | |
5e6c2067 JA |
153 | struct fio_file *f; |
154 | char dev[256]; | |
155 | unsigned int i; | |
156 | ||
157 | if (last_maj == maj && last_min == min) | |
158 | return; | |
159 | ||
160 | last_maj = maj; | |
161 | last_min = min; | |
162 | ||
163 | /* | |
164 | * check for this file in our list | |
165 | */ | |
166 | for_each_file(td, f, i) | |
167 | if (f->major == maj && f->minor == min) | |
168 | return; | |
169 | ||
170 | strcpy(dev, "/dev"); | |
171 | if (lookup_device(dev, maj, min)) | |
172 | add_file(td, dev); | |
173 | } | |
174 | ||
8c1fdf04 JA |
175 | /* |
176 | * Store blk_io_trace data in an ipo for later retrieval. | |
177 | */ | |
fdefd987 | 178 | static void store_ipo(struct thread_data *td, unsigned long long offset, |
8c1fdf04 | 179 | unsigned int bytes, int rw, unsigned long long ttime) |
fdefd987 JA |
180 | { |
181 | struct io_piece *ipo = malloc(sizeof(*ipo)); | |
182 | ||
183 | memset(ipo, 0, sizeof(*ipo)); | |
184 | INIT_LIST_HEAD(&ipo->list); | |
a2eea81b JA |
185 | /* |
186 | * the 512 is wrong here, it should be the hardware sector size... | |
187 | */ | |
188 | ipo->offset = offset * 512; | |
fdefd987 | 189 | ipo->len = bytes; |
8c1fdf04 | 190 | ipo->delay = ttime / 1000; |
fdefd987 JA |
191 | if (rw) |
192 | ipo->ddir = DDIR_WRITE; | |
193 | else | |
194 | ipo->ddir = DDIR_READ; | |
195 | ||
196 | list_add_tail(&ipo->list, &td->io_log_list); | |
197 | } | |
198 | ||
8c1fdf04 JA |
199 | /* |
200 | * We only care for queue traces, most of the others are side effects | |
201 | * due to internal workings of the block layer. | |
202 | */ | |
203 | static void handle_trace(struct thread_data *td, struct blk_io_trace *t, | |
d84f8d49 JA |
204 | unsigned long long ttime, unsigned long *ios, |
205 | unsigned int *bs) | |
fb7b71a3 | 206 | { |
fdefd987 JA |
207 | int rw; |
208 | ||
209 | if ((t->action & 0xffff) != __BLK_TA_QUEUE) | |
210 | return; | |
a2eea81b JA |
211 | if (t->action & BLK_TC_ACT(BLK_TC_PC)) |
212 | return; | |
3f3d3616 | 213 | if (t->action & BLK_TC_ACT(BLK_TC_NOTIFY)) |
a2eea81b | 214 | return; |
fdefd987 | 215 | |
5e6c2067 JA |
216 | trace_add_file(td, t->device); |
217 | ||
e7a7d70b | 218 | rw = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0; |
d84f8d49 JA |
219 | |
220 | if (t->bytes > bs[rw]) | |
221 | bs[rw] = t->bytes; | |
222 | ||
8c1fdf04 | 223 | ios[rw]++; |
6df8adaa | 224 | td->o.size += t->bytes; |
8c1fdf04 | 225 | store_ipo(td, t->sector, t->bytes, rw, ttime); |
fb7b71a3 JA |
226 | } |
227 | ||
8c1fdf04 JA |
228 | /* |
229 | * Load a blktrace file by reading all the blk_io_trace entries, and storing | |
230 | * them as io_pieces like the fio text version would do. | |
231 | */ | |
fb7b71a3 JA |
232 | int load_blktrace(struct thread_data *td, const char *filename) |
233 | { | |
a61eddec | 234 | unsigned long long ttime, delay; |
fb7b71a3 | 235 | struct blk_io_trace t; |
4241ea8f | 236 | unsigned long ios[2], skipped_writes; |
a61eddec | 237 | unsigned int cpu; |
d84f8d49 | 238 | unsigned int rw_bs[2]; |
e2887563 | 239 | struct fifo *fifo; |
fb7b71a3 JA |
240 | int fd; |
241 | ||
242 | fd = open(filename, O_RDONLY); | |
243 | if (fd < 0) { | |
244 | td_verror(td, errno, "open blktrace file"); | |
245 | return 1; | |
246 | } | |
247 | ||
e2887563 JA |
248 | fifo = fifo_alloc(TRACE_FIFO_SIZE); |
249 | ||
6df8adaa JA |
250 | td->o.size = 0; |
251 | ||
a61eddec | 252 | cpu = 0; |
d84f8d49 JA |
253 | ttime = 0; |
254 | ios[0] = ios[1] = 0; | |
255 | rw_bs[0] = rw_bs[1] = 0; | |
4241ea8f | 256 | skipped_writes = 0; |
fb7b71a3 | 257 | do { |
e2887563 | 258 | int ret = trace_fifo_get(td, fifo, fd, &t, sizeof(t)); |
fb7b71a3 | 259 | |
e2887563 | 260 | if (ret < 0) |
8c1fdf04 | 261 | goto err; |
e2887563 JA |
262 | else if (!ret) |
263 | break; | |
264 | else if (ret < (int) sizeof(t)) { | |
265 | log_err("fio: short fifo get\n"); | |
fb7b71a3 | 266 | break; |
fb7b71a3 JA |
267 | } |
268 | ||
269 | if ((t.magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) { | |
f12b323f | 270 | log_err("fio: bad magic in blktrace data: %x\n", t.magic); |
8c1fdf04 | 271 | goto err; |
fb7b71a3 JA |
272 | } |
273 | if ((t.magic & 0xff) != BLK_IO_TRACE_VERSION) { | |
274 | log_err("fio: bad blktrace version %d\n", t.magic & 0xff); | |
8c1fdf04 | 275 | goto err; |
fb7b71a3 | 276 | } |
f12b323f JA |
277 | ret = discard_pdu(td, fifo, fd, &t); |
278 | if (ret < 0) { | |
fb7b71a3 | 279 | td_verror(td, ret, "blktrace lseek"); |
8c1fdf04 | 280 | goto err; |
f12b323f JA |
281 | } else if (t.pdu_len != ret) { |
282 | log_err("fio: discarded %d of %d\n", ret, t.pdu_len); | |
283 | goto err; | |
fb7b71a3 | 284 | } |
f3f72c5e JA |
285 | if (t.action & BLK_TC_ACT(BLK_TC_NOTIFY)) |
286 | continue; | |
a61eddec | 287 | if (!ttime) { |
8c1fdf04 | 288 | ttime = t.time; |
a61eddec JA |
289 | cpu = t.cpu; |
290 | } | |
291 | delay = 0; | |
292 | if (cpu == t.cpu) | |
293 | delay = t.time - ttime; | |
4241ea8f JA |
294 | if ((t.action & BLK_TC_ACT(BLK_TC_WRITE)) && read_only) |
295 | skipped_writes++; | |
296 | else | |
297 | handle_trace(td, &t, delay, ios, rw_bs); | |
8c1fdf04 | 298 | ttime = t.time; |
a61eddec | 299 | cpu = t.cpu; |
fb7b71a3 JA |
300 | } while (1); |
301 | ||
38470f85 | 302 | fifo_free(fifo); |
fb7b71a3 | 303 | close(fd); |
8c1fdf04 | 304 | |
4241ea8f JA |
305 | if (skipped_writes) |
306 | log_err("fio: <%s> skips replay of %lu writes due to read-only\n", td->o.name, skipped_writes); | |
307 | ||
8c1fdf04 JA |
308 | if (!ios[DDIR_READ] && !ios[DDIR_WRITE]) { |
309 | log_err("fio: found no ios in blktrace data\n"); | |
310 | return 1; | |
d84f8d49 | 311 | } else if (ios[DDIR_READ] && !ios[DDIR_READ]) { |
8c1fdf04 | 312 | td->o.td_ddir = TD_DDIR_READ; |
d84f8d49 JA |
313 | td->o.max_bs[DDIR_READ] = rw_bs[DDIR_READ]; |
314 | } else if (!ios[DDIR_READ] && ios[DDIR_WRITE]) { | |
8c1fdf04 | 315 | td->o.td_ddir = TD_DDIR_WRITE; |
d84f8d49 JA |
316 | td->o.max_bs[DDIR_WRITE] = rw_bs[DDIR_WRITE]; |
317 | } else { | |
8c1fdf04 | 318 | td->o.td_ddir = TD_DDIR_RW; |
d84f8d49 JA |
319 | td->o.max_bs[DDIR_READ] = rw_bs[DDIR_READ]; |
320 | td->o.max_bs[DDIR_WRITE] = rw_bs[DDIR_WRITE]; | |
321 | } | |
8c1fdf04 JA |
322 | |
323 | /* | |
324 | * We need to do direct/raw ios to the device, to avoid getting | |
325 | * read-ahead in our way. | |
326 | */ | |
327 | td->o.odirect = 1; | |
328 | ||
fb7b71a3 | 329 | return 0; |
8c1fdf04 JA |
330 | err: |
331 | close(fd); | |
38470f85 | 332 | fifo_free(fifo); |
8c1fdf04 | 333 | return 1; |
fb7b71a3 | 334 | } |