2 * Code related to writing an iolog of what a thread is doing, and to
3 * later read that back and replay
11 static const char iolog_ver2[] = "fio version 2 iolog";
13 void log_io_u(struct thread_data *td, struct io_u *io_u)
15 const char *act[] = { "read", "write", "sync" };
17 assert(io_u->ddir < 3);
19 if (!td->o.write_iolog_file)
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);
25 void log_file(struct thread_data *td, struct fio_file *f,
26 enum file_log_act what)
28 const char *act[] = { "add", "open", "close" };
32 if (!td->o.write_iolog_file)
35 fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
38 static void iolog_delay(struct thread_data *td, unsigned long delay)
40 unsigned long usec = utime_since_now(&td->last_issue);
48 * less than 100 usec delay, just regard it as noise
53 usec_sleep(td, delay);
56 int read_iolog_get(struct thread_data *td, struct io_u *io_u)
60 while (!list_empty(&td->io_log_list)) {
61 ipo = list_entry(td->io_log_list.next, struct io_piece, list);
65 * invalid ddir, this is a file action
67 if (ipo->ddir == DDIR_INVAL) {
68 struct fio_file *f = &td->files[ipo->fileno];
70 if (ipo->file_action == FIO_LOG_OPEN_FILE) {
71 assert(!td_io_open_file(td, f));
74 } else if (ipo->file_action == FIO_LOG_CLOSE_FILE) {
75 td_io_close_file(td, f);
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];
88 iolog_delay(td, ipo->delay);
98 void prune_io_piece_log(struct thread_data *td)
100 struct io_piece *ipo;
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);
111 * log a successful write, so we can unwind the log for verify
113 void log_io_piece(struct thread_data *td, struct io_u *io_u)
115 struct rb_node **p, *parent;
116 struct io_piece *ipo, *__ipo;
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;
124 * We don't need to sort the entries, if:
126 * Sequential writes, or
127 * Random writes that lay out the file as it goes along
129 * For both these cases, just reading back data in the order we
130 * wrote it out is the fastest.
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);
139 RB_CLEAR_NODE(&ipo->rb_node);
140 p = &td->io_hist_tree.rb_node;
144 * Sort the entry into the verification list
149 __ipo = rb_entry(parent, struct io_piece, rb_node);
150 if (ipo->offset <= __ipo->offset)
156 rb_link_node(&ipo->rb_node, parent, p);
157 rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
160 void write_iolog_close(struct thread_data *td)
166 td->iolog_buf = NULL;
170 * Read version 2 iolog data. It is enhanced to include per-file logging,
173 static int read_iolog2(struct thread_data *td, FILE *f)
175 unsigned long long offset;
177 int reads, writes, fileno = 0, file_action = 0; /* stupid gcc */
182 free_release_files(td);
185 * Read in the read iolog and store it, reuse the infrastructure
186 * for doing verifications.
189 fname = malloc(256+16);
190 act = malloc(256+16);
193 while ((p = fgets(str, 4096, f)) != NULL) {
194 struct io_piece *ipo;
197 r = sscanf(p, "%256s %256s %llu %u", fname, act, &offset, &bytes);
202 if (!strcmp(act, "read"))
204 else if (!strcmp(act, "write"))
206 else if (!strcmp(act, "sync"))
209 log_err("fio: bad iolog file action: %s\n",act);
214 if (!strcmp(act, "add")) {
216 fileno = add_file(td, fname);
217 file_action = FIO_LOG_ADD_FILE;
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;
226 log_err("fio: bad iolog file action: %s\n",act);
230 log_err("bad iolog2: %s", p);
236 else if (rw == DDIR_WRITE) {
239 * Don't add a write for ro mode
243 } else if (rw != DDIR_SYNC && rw != DDIR_INVAL) {
244 log_err("bad ddir: %d\n", rw);
251 ipo = malloc(sizeof(*ipo));
252 memset(ipo, 0, sizeof(*ipo));
253 INIT_LIST_HEAD(&ipo->list);
254 ipo->offset = offset;
257 if (bytes > td->o.max_bs[rw])
258 td->o.max_bs[rw] = bytes;
259 if (rw == DDIR_INVAL) {
260 ipo->fileno = fileno;
261 ipo->file_action = file_action;
263 list_add_tail(&ipo->list, &td->io_log_list);
264 td->total_io_size += bytes;
271 if (writes && read_only) {
272 log_err("fio: <%s> skips replay of %d writes due to read-only\n", td->o.name, writes);
276 if (!reads && !writes)
278 else if (reads && !writes)
279 td->o.td_ddir = TD_DDIR_READ;
280 else if (!reads && writes)
281 td->o.td_ddir = TD_DDIR_WRITE;
283 td->o.td_ddir = TD_DDIR_RW;
289 * Read version 1 iolog data.
291 static int read_iolog(struct thread_data *td, FILE *f)
293 unsigned long long offset;
300 * Read in the read iolog and store it, reuse the infrastructure
301 * for doing verifications.
305 while ((p = fgets(str, 4096, f)) != NULL) {
306 struct io_piece *ipo;
308 if (sscanf(p, "%d,%llu,%u", &rw, &offset, &bytes) != 3) {
309 log_err("bad iolog: %s\n", p);
314 else if (rw == DDIR_WRITE) {
317 * Don't add a write for ro mode
321 } else if (rw != DDIR_SYNC) {
322 log_err("bad ddir: %d\n", rw);
326 ipo = malloc(sizeof(*ipo));
327 memset(ipo, 0, sizeof(*ipo));
328 INIT_LIST_HEAD(&ipo->list);
329 ipo->offset = offset;
331 ipo->ddir = (enum fio_ddir) rw;
332 if (bytes > td->o.max_bs[rw])
333 td->o.max_bs[rw] = bytes;
334 list_add_tail(&ipo->list, &td->io_log_list);
335 td->total_io_size += bytes;
340 if (writes && read_only) {
341 log_err("fio: <%s> skips replay of %d writes due to read-only\n", td->o.name, writes);
345 if (!reads && !writes)
347 else if (reads && !writes)
348 td->o.td_ddir = TD_DDIR_READ;
349 else if (!reads && writes)
350 td->o.td_ddir = TD_DDIR_WRITE;
352 td->o.td_ddir = TD_DDIR_RW;
358 * open iolog, check version, and call appropriate parser
360 static int init_iolog_read(struct thread_data *td)
362 char buffer[256], *p;
366 f = fopen(td->o.read_iolog_file, "r");
368 perror("fopen read iolog");
372 p = fgets(buffer, sizeof(buffer), f);
374 td_verror(td, errno, "iolog read");
375 log_err("fio: unable to read iolog\n");
380 * version 2 of the iolog stores a specific string as the
381 * first line, check for that
383 if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
384 ret = read_iolog2(td, f);
387 * seek back to the beginning
389 if (fseek(f, 0, SEEK_SET) < 0) {
390 td_verror(td, errno, "iolog read");
391 log_err("fio: unable to read iolog\n");
395 ret = read_iolog(td, f);
403 * Setup a log for storing io patterns.
405 static int init_iolog_write(struct thread_data *td)
411 f = fopen(td->o.write_iolog_file, "w+");
413 perror("fopen write iolog");
418 * That's it for writing, setup a log buffer and we're done.
421 td->iolog_buf = malloc(8192);
422 setvbuf(f, td->iolog_buf, _IOFBF, 8192);
425 * write our version line
427 if (fprintf(f, "%s\n", iolog_ver2) < 0) {
428 perror("iolog init\n");
433 * add all known files
435 for_each_file(td, ff, i)
436 log_file(td, ff, FIO_LOG_ADD_FILE);
441 int init_iolog(struct thread_data *td)
445 if (td->io_ops->flags & FIO_DISKLESSIO)
448 if (td->o.read_iolog_file) {
450 * Check if it's a blktrace file and load that if possible.
451 * Otherwise assume it's a normal log file and load that.
453 if (is_blktrace(td->o.read_iolog_file))
454 ret = load_blktrace(td, td->o.read_iolog_file);
456 ret = init_iolog_read(td);
457 } else if (td->o.write_iolog_file)
458 ret = init_iolog_write(td);
463 void setup_log(struct io_log **log)
465 struct io_log *l = malloc(sizeof(*l));
468 l->max_samples = 1024;
469 l->log = malloc(l->max_samples * sizeof(struct io_sample));
473 void __finish_log(struct io_log *log, const char *name)
478 f = fopen(name, "w");
484 for (i = 0; i < log->nr_samples; i++)
485 fprintf(f, "%lu, %lu, %u\n", log->log[i].time, log->log[i].val, log->log[i].ddir);
492 void finish_log(struct thread_data *td, struct io_log *log, const char *name)
496 snprintf(file_name, 200, "client%d_%s.log", td->thread_number, name);
497 __finish_log(log, file_name);