[PATCH] Allow verification to be done at finer granularity
[fio.git] / log.c
1 /*
2  * Code related to writing an iolog of what a thread is doing, and to
3  * later read that back and replay
4  */
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <assert.h>
8 #include "list.h"
9 #include "fio.h"
10
11 static const char iolog_ver2[] = "fio version 2 iolog";
12
13 void log_io_u(struct thread_data *td, struct io_u *io_u)
14 {
15         const char *act[] = { "read", "write", "sync" };
16
17         assert(io_u->ddir < 3);
18
19         if (!td->o.write_iolog_file)
20                 return;
21
22         fprintf(td->iolog_f, "%s %s %llu %lu\n", io_u->file->file_name, act[io_u->ddir], io_u->offset, io_u->buflen);
23 }
24
25 void log_file(struct thread_data *td, struct fio_file *f,
26               enum file_log_act what)
27 {
28         const char *act[] = { "add", "open", "close" };
29
30         assert(what < 3);
31
32         if (!td->o.write_iolog_file)
33                 return;
34
35         fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
36 }
37
38 static void iolog_delay(struct thread_data *td, unsigned long delay)
39 {
40         unsigned long usec = utime_since_now(&td->last_issue);
41
42         if (delay < usec)
43                 return;
44
45         delay -= usec;
46
47         /*
48          * less than 100 usec delay, just regard it as noise
49          */
50         if (delay < 100)
51                 return;
52
53         usec_sleep(td, delay);
54 }
55
56 int read_iolog_get(struct thread_data *td, struct io_u *io_u)
57 {
58         struct io_piece *ipo;
59
60         while (!list_empty(&td->io_log_list)) {
61                 ipo = list_entry(td->io_log_list.next, struct io_piece, list);
62                 list_del(&ipo->list);
63
64                 /*
65                  * invalid ddir, this is a file action
66                  */
67                 if (ipo->ddir == DDIR_INVAL) {
68                         struct fio_file *f = &td->files[ipo->fileno];
69
70                         if (ipo->file_action == FIO_LOG_OPEN_FILE) {
71                                 assert(!td_io_open_file(td, f));
72                                 free(ipo);
73                                 continue;
74                         } else if (ipo->file_action == FIO_LOG_CLOSE_FILE) {
75                                 td_io_close_file(td, f);
76                                 free(ipo);
77                                 continue;
78                         }
79                 }
80
81                 io_u->offset = ipo->offset;
82                 io_u->buflen = ipo->len;
83                 io_u->ddir = ipo->ddir;
84                 io_u->file = &td->files[ipo->fileno];
85                 get_file(io_u->file);
86
87                 if (ipo->delay)
88                         iolog_delay(td, ipo->delay);
89
90                 free(ipo);
91                 return 0;
92         }
93
94         td->done = 1;
95         return 1;
96 }
97
98 void prune_io_piece_log(struct thread_data *td)
99 {
100         struct io_piece *ipo;
101         struct rb_node *n;
102
103         while ((n = rb_first(&td->io_hist_tree)) != NULL) {
104                 ipo = rb_entry(n, struct io_piece, rb_node);
105                 rb_erase(n, &td->io_hist_tree);
106                 free(ipo);
107         }
108 }
109
110 /*
111  * log a successful write, so we can unwind the log for verify
112  */
113 void log_io_piece(struct thread_data *td, struct io_u *io_u)
114 {
115         struct rb_node **p, *parent;
116         struct io_piece *ipo, *__ipo;
117
118         ipo = malloc(sizeof(struct io_piece));
119         ipo->file = io_u->file;
120         ipo->offset = io_u->offset;
121         ipo->len = io_u->buflen;
122
123         /*
124          * We don't need to sort the entries, if:
125          *
126          *      Sequential writes, or
127          *      Random writes that lay out the file as it goes along
128          *
129          * For both these cases, just reading back data in the order we
130          * wrote it out is the fastest.
131          */
132         if (!td_random(td) || !td->o.overwrite ||
133              (io_u->file->flags & FIO_FILE_NOSORT)) {
134                 INIT_LIST_HEAD(&ipo->list);
135                 list_add_tail(&ipo->list, &td->io_hist_list);
136                 return;
137         }
138
139         RB_CLEAR_NODE(&ipo->rb_node);
140         p = &td->io_hist_tree.rb_node;
141         parent = NULL;
142
143         /*
144          * Sort the entry into the verification list
145          */
146         while (*p) {
147                 parent = *p;
148
149                 __ipo = rb_entry(parent, struct io_piece, rb_node);
150                 if (ipo->offset <= __ipo->offset)
151                         p = &(*p)->rb_left;
152                 else
153                         p = &(*p)->rb_right;
154         }
155
156         rb_link_node(&ipo->rb_node, parent, p);
157         rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
158 }
159
160 void write_iolog_close(struct thread_data *td)
161 {
162         fflush(td->iolog_f);
163         fclose(td->iolog_f);
164         free(td->iolog_buf);
165         td->iolog_f = NULL;
166         td->iolog_buf = NULL;
167 }
168
169 /*
170  * Read version 2 iolog data. It is enhanced to include per-file logging,
171  * syncs, etc.
172  */
173 static int read_iolog2(struct thread_data *td, FILE *f)
174 {
175         unsigned long long offset;
176         unsigned int bytes;
177         int reads, writes, fileno = 0, file_action = 0; /* stupid gcc */
178         char *fname, *act;
179         char *str, *p;
180         enum fio_ddir rw;
181
182         free_release_files(td);
183
184         /*
185          * Read in the read iolog and store it, reuse the infrastructure
186          * for doing verifications.
187          */
188         str = malloc(4096);
189         fname = malloc(256+16);
190         act = malloc(256+16);
191
192         reads = writes = 0;
193         while ((p = fgets(str, 4096, f)) != NULL) {
194                 struct io_piece *ipo;
195                 int r;
196
197                 r = sscanf(p, "%256s %256s %llu %u", fname, act, &offset, &bytes);
198                 if (r == 4) {
199                         /*
200                          * Check action first
201                          */
202                         if (!strcmp(act, "read"))
203                                 rw = DDIR_READ;
204                         else if (!strcmp(act, "write"))
205                                 rw = DDIR_WRITE;
206                         else if (!strcmp(act, "sync"))
207                                 rw = DDIR_SYNC;
208                         else {
209                                 log_err("fio: bad iolog file action: %s\n",act);
210                                 continue;
211                         }
212                 } else if (r == 2) {
213                         rw = DDIR_INVAL;
214                         if (!strcmp(act, "add")) {
215                                 td->o.nr_files++;
216                                 fileno = add_file(td, fname);
217                                 file_action = FIO_LOG_ADD_FILE;
218                                 continue;
219                         } else if (!strcmp(act, "open")) {
220                                 fileno = get_fileno(td, fname);
221                                 file_action = FIO_LOG_OPEN_FILE;
222                         } else if (!strcmp(act, "close")) {
223                                 fileno = get_fileno(td, fname);
224                                 file_action = FIO_LOG_CLOSE_FILE;
225                         } else {
226                                 log_err("fio: bad iolog file action: %s\n",act);
227                                 continue;
228                         }
229                 } else {
230                         log_err("bad iolog2: %s", p);
231                         continue;
232                 }
233                         
234                 if (rw == DDIR_READ)
235                         reads++;
236                 else if (rw == DDIR_WRITE)
237                         writes++;
238                 else if (rw != DDIR_SYNC && rw != DDIR_INVAL) {
239                         log_err("bad ddir: %d\n", rw);
240                         continue;
241                 }
242
243                 /*
244                  * Make note of file
245                  */
246                 ipo = malloc(sizeof(*ipo));
247                 memset(ipo, 0, sizeof(*ipo));
248                 INIT_LIST_HEAD(&ipo->list);
249                 ipo->offset = offset;
250                 ipo->len = bytes;
251                 ipo->ddir = rw;
252                 if (bytes > td->o.max_bs[rw])
253                         td->o.max_bs[rw] = bytes;
254                 if (rw == DDIR_INVAL) {
255                         ipo->fileno = fileno;
256                         ipo->file_action = file_action;
257                 }
258                 list_add_tail(&ipo->list, &td->io_log_list);
259         }
260
261         free(str);
262         free(act);
263         free(fname);
264
265         if (!reads && !writes)
266                 return 1;
267         else if (reads && !writes)
268                 td->o.td_ddir = TD_DDIR_READ;
269         else if (!reads && writes)
270                 td->o.td_ddir = TD_DDIR_WRITE;
271         else
272                 td->o.td_ddir = TD_DDIR_RW;
273
274         return 0;
275 }
276
277 /*
278  * Read version 1 iolog data.
279  */
280 static int read_iolog(struct thread_data *td, FILE *f)
281 {
282         unsigned long long offset;
283         unsigned int bytes;
284         char *str, *p;
285         int reads, writes;
286         enum fio_ddir rw;
287
288         /*
289          * Read in the read iolog and store it, reuse the infrastructure
290          * for doing verifications.
291          */
292         str = malloc(4096);
293         reads = writes = 0;
294         while ((p = fgets(str, 4096, f)) != NULL) {
295                 struct io_piece *ipo;
296
297                 if (sscanf(p, "%d,%llu,%u", &rw, &offset, &bytes) != 3) {
298                         log_err("bad iolog: %s\n", p);
299                         continue;
300                 }
301                 if (rw == DDIR_READ)
302                         reads++;
303                 else if (rw == DDIR_WRITE)
304                         writes++;
305                 else if (rw != DDIR_SYNC) {
306                         log_err("bad ddir: %d\n", rw);
307                         continue;
308                 }
309
310                 ipo = malloc(sizeof(*ipo));
311                 memset(ipo, 0, sizeof(*ipo));
312                 INIT_LIST_HEAD(&ipo->list);
313                 ipo->offset = offset;
314                 ipo->len = bytes;
315                 ipo->ddir = rw;
316                 if (bytes > td->o.max_bs[rw])
317                         td->o.max_bs[rw] = bytes;
318                 list_add_tail(&ipo->list, &td->io_log_list);
319         }
320
321         free(str);
322
323         if (!reads && !writes)
324                 return 1;
325         else if (reads && !writes)
326                 td->o.td_ddir = TD_DDIR_READ;
327         else if (!reads && writes)
328                 td->o.td_ddir = TD_DDIR_WRITE;
329         else
330                 td->o.td_ddir = TD_DDIR_RW;
331
332         return 0;
333 }
334
335 /*
336  * open iolog, check version, and call appropriate parser
337  */
338 static int init_iolog_read(struct thread_data *td)
339 {
340         char buffer[256], *p;
341         FILE *f;
342         int ret;
343
344         f = fopen(td->o.read_iolog_file, "r");
345         if (!f) {
346                 perror("fopen read iolog");
347                 return 1;
348         }
349
350         p = fgets(buffer, sizeof(buffer), f);
351         if (!p) {
352                 td_verror(td, errno, "iolog read");
353                 log_err("fio: unable to read iolog\n");
354                 return 1;
355         }
356
357         /*
358          * version 2 of the iolog stores a specific string as the
359          * first line, check for that
360          */
361         if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
362                 ret = read_iolog2(td, f);
363         else {
364                 /*
365                  * seek back to the beginning
366                  */
367                 if (fseek(f, 0, SEEK_SET) < 0) {
368                         td_verror(td, errno, "iolog read");
369                         log_err("fio: unable to read iolog\n");
370                         return 1;
371                 }
372
373                 ret = read_iolog(td, f);
374         }
375
376         fclose(f);
377         return ret;
378 }
379
380 /*
381  * Setup a log for storing io patterns.
382  */
383 static int init_iolog_write(struct thread_data *td)
384 {
385         struct fio_file *ff;
386         FILE *f;
387         unsigned int i;
388
389         f = fopen(td->o.write_iolog_file, "w+");
390         if (!f) {
391                 perror("fopen write iolog");
392                 return 1;
393         }
394
395         /*
396          * That's it for writing, setup a log buffer and we're done.
397           */
398         td->iolog_f = f;
399         td->iolog_buf = malloc(8192);
400         setvbuf(f, td->iolog_buf, _IOFBF, 8192);
401
402         /*
403          * write our version line
404          */
405         if (fprintf(f, "%s\n", iolog_ver2) < 0) {
406                 perror("iolog init\n");
407                 return 1;
408         }
409
410         /*
411          * add all known files
412          */
413         for_each_file(td, ff, i)
414                 log_file(td, ff, FIO_LOG_ADD_FILE);
415
416         return 0;
417 }
418
419 int init_iolog(struct thread_data *td)
420 {
421         int ret = 0;
422
423         if (td->io_ops->flags & FIO_DISKLESSIO)
424                 return 0;
425
426         if (td->o.read_iolog_file) {
427                 /*
428                  * Check if it's a blktrace file and load that if possible.
429                  * Otherwise assume it's a normal log file and load that.
430                  */
431                 if (is_blktrace(td->o.read_iolog_file))
432                         ret = load_blktrace(td, td->o.read_iolog_file);
433                 else
434                         ret = init_iolog_read(td);
435         } else if (td->o.write_iolog_file)
436                 ret = init_iolog_write(td);
437
438         return ret;
439 }
440
441 void setup_log(struct io_log **log)
442 {
443         struct io_log *l = malloc(sizeof(*l));
444
445         l->nr_samples = 0;
446         l->max_samples = 1024;
447         l->log = malloc(l->max_samples * sizeof(struct io_sample));
448         *log = l;
449 }
450
451 void __finish_log(struct io_log *log, const char *name)
452 {
453         unsigned int i;
454         FILE *f;
455
456         f = fopen(name, "w");
457         if (!f) {
458                 perror("fopen log");
459                 return;
460         }
461
462         for (i = 0; i < log->nr_samples; i++)
463                 fprintf(f, "%lu, %lu, %u\n", log->log[i].time, log->log[i].val, log->log[i].ddir);
464
465         fclose(f);
466         free(log->log);
467         free(log);
468 }
469
470 void finish_log(struct thread_data *td, struct io_log *log, const char *name)
471 {
472         char file_name[256];
473
474         snprintf(file_name, 200, "client%d_%s.log", td->thread_number, name);
475         __finish_log(log, file_name);
476 }