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,
23 act[io_u->ddir], io_u->offset,
27 void log_file(struct thread_data *td, struct fio_file *f,
28 enum file_log_act what)
30 const char *act[] = { "add", "open", "close" };
34 if (!td->o.write_iolog_file)
37 fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
40 static void iolog_delay(struct thread_data *td, unsigned long delay)
42 unsigned long usec = utime_since_now(&td->last_issue);
50 * less than 100 usec delay, just regard it as noise
55 usec_sleep(td, delay);
58 int read_iolog_get(struct thread_data *td, struct io_u *io_u)
62 while (!list_empty(&td->io_log_list)) {
63 ipo = list_entry(td->io_log_list.next, struct io_piece, list);
67 * invalid ddir, this is a file action
69 if (ipo->ddir == DDIR_INVAL) {
70 struct fio_file *f = td->files[ipo->fileno];
72 if (ipo->file_action == FIO_LOG_OPEN_FILE) {
73 assert(!td_io_open_file(td, f));
76 } else if (ipo->file_action == FIO_LOG_CLOSE_FILE) {
77 td_io_close_file(td, f);
83 io_u->offset = ipo->offset;
84 io_u->buflen = ipo->len;
85 io_u->ddir = ipo->ddir;
86 io_u->file = td->files[ipo->fileno];
89 dprint(FD_IO, "iolog: get %llu/%lu/%s\n", io_u->offset,
90 io_u->buflen, io_u->file->file_name);
93 iolog_delay(td, ipo->delay);
103 void prune_io_piece_log(struct thread_data *td)
105 struct io_piece *ipo;
108 while ((n = rb_first(&td->io_hist_tree)) != NULL) {
109 ipo = rb_entry(n, struct io_piece, rb_node);
110 rb_erase(n, &td->io_hist_tree);
114 while (!list_empty(&td->io_hist_list)) {
115 ipo = list_entry(td->io_hist_list.next, struct io_piece, list);
116 list_del(&ipo->list);
122 * log a successful write, so we can unwind the log for verify
124 void log_io_piece(struct thread_data *td, struct io_u *io_u)
126 struct rb_node **p, *parent;
127 struct io_piece *ipo, *__ipo;
129 ipo = malloc(sizeof(struct io_piece));
130 ipo->file = io_u->file;
131 ipo->offset = io_u->offset;
132 ipo->len = io_u->buflen;
135 * We don't need to sort the entries, if:
137 * Sequential writes, or
138 * Random writes that lay out the file as it goes along
140 * For both these cases, just reading back data in the order we
141 * wrote it out is the fastest.
143 if (!td_random(td) || !td->o.overwrite) {
144 INIT_LIST_HEAD(&ipo->list);
145 list_add_tail(&ipo->list, &td->io_hist_list);
149 RB_CLEAR_NODE(&ipo->rb_node);
150 p = &td->io_hist_tree.rb_node;
154 * Sort the entry into the verification list
159 __ipo = rb_entry(parent, struct io_piece, rb_node);
160 if (ipo->offset <= __ipo->offset)
166 rb_link_node(&ipo->rb_node, parent, p);
167 rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
170 void write_iolog_close(struct thread_data *td)
176 td->iolog_buf = NULL;
180 * Read version 2 iolog data. It is enhanced to include per-file logging,
183 static int read_iolog2(struct thread_data *td, FILE *f)
185 unsigned long long offset;
187 int reads, writes, fileno = 0, file_action = 0; /* stupid gcc */
192 free_release_files(td);
195 * Read in the read iolog and store it, reuse the infrastructure
196 * for doing verifications.
199 fname = malloc(256+16);
200 act = malloc(256+16);
203 while ((p = fgets(str, 4096, f)) != NULL) {
204 struct io_piece *ipo;
207 r = sscanf(p, "%256s %256s %llu %u", fname, act, &offset,
213 if (!strcmp(act, "read"))
215 else if (!strcmp(act, "write"))
217 else if (!strcmp(act, "sync"))
220 log_err("fio: bad iolog file action: %s\n",
226 if (!strcmp(act, "add")) {
228 fileno = add_file(td, fname);
229 file_action = FIO_LOG_ADD_FILE;
231 } else if (!strcmp(act, "open")) {
232 fileno = get_fileno(td, fname);
233 file_action = FIO_LOG_OPEN_FILE;
234 } else if (!strcmp(act, "close")) {
235 fileno = get_fileno(td, fname);
236 file_action = FIO_LOG_CLOSE_FILE;
238 log_err("fio: bad iolog file action: %s\n",
243 log_err("bad iolog2: %s", p);
249 else if (rw == DDIR_WRITE) {
252 * Don't add a write for ro mode
256 } else if (rw != DDIR_SYNC && rw != DDIR_INVAL) {
257 log_err("bad ddir: %d\n", rw);
264 ipo = malloc(sizeof(*ipo));
265 memset(ipo, 0, sizeof(*ipo));
266 INIT_LIST_HEAD(&ipo->list);
267 ipo->offset = offset;
270 if (bytes > td->o.max_bs[rw])
271 td->o.max_bs[rw] = bytes;
272 if (rw == DDIR_INVAL) {
273 ipo->fileno = fileno;
274 ipo->file_action = file_action;
276 list_add_tail(&ipo->list, &td->io_log_list);
277 td->total_io_size += bytes;
284 if (writes && read_only) {
285 log_err("fio: <%s> skips replay of %d writes due to"
286 " read-only\n", td->o.name, writes);
290 if (!reads && !writes)
292 else if (reads && !writes)
293 td->o.td_ddir = TD_DDIR_READ;
294 else if (!reads && writes)
295 td->o.td_ddir = TD_DDIR_WRITE;
297 td->o.td_ddir = TD_DDIR_RW;
303 * Read version 1 iolog data.
305 static int read_iolog(struct thread_data *td, FILE *f)
307 unsigned long long offset;
314 * Read in the read iolog and store it, reuse the infrastructure
315 * for doing verifications.
319 while ((p = fgets(str, 4096, f)) != NULL) {
320 struct io_piece *ipo;
322 if (sscanf(p, "%d,%llu,%u", &rw, &offset, &bytes) != 3) {
323 log_err("bad iolog: %s\n", p);
328 else if (rw == DDIR_WRITE) {
331 * Don't add a write for ro mode
335 } else if (rw != DDIR_SYNC) {
336 log_err("bad ddir: %d\n", rw);
340 ipo = malloc(sizeof(*ipo));
341 memset(ipo, 0, sizeof(*ipo));
342 INIT_LIST_HEAD(&ipo->list);
343 ipo->offset = offset;
345 ipo->ddir = (enum fio_ddir) rw;
346 if (bytes > td->o.max_bs[rw])
347 td->o.max_bs[rw] = bytes;
348 list_add_tail(&ipo->list, &td->io_log_list);
349 td->total_io_size += bytes;
354 if (writes && read_only) {
355 log_err("fio: <%s> skips replay of %d writes due to"
356 " read-only\n", td->o.name, writes);
360 if (!reads && !writes)
362 else if (reads && !writes)
363 td->o.td_ddir = TD_DDIR_READ;
364 else if (!reads && writes)
365 td->o.td_ddir = TD_DDIR_WRITE;
367 td->o.td_ddir = TD_DDIR_RW;
373 * open iolog, check version, and call appropriate parser
375 static int init_iolog_read(struct thread_data *td)
377 char buffer[256], *p;
381 f = fopen(td->o.read_iolog_file, "r");
383 perror("fopen read iolog");
387 p = fgets(buffer, sizeof(buffer), f);
389 td_verror(td, errno, "iolog read");
390 log_err("fio: unable to read iolog\n");
395 * version 2 of the iolog stores a specific string as the
396 * first line, check for that
398 if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
399 ret = read_iolog2(td, f);
402 * seek back to the beginning
404 if (fseek(f, 0, SEEK_SET) < 0) {
405 td_verror(td, errno, "iolog read");
406 log_err("fio: unable to read iolog\n");
410 ret = read_iolog(td, f);
418 * Setup a log for storing io patterns.
420 static int init_iolog_write(struct thread_data *td)
426 f = fopen(td->o.write_iolog_file, "w+");
428 perror("fopen write iolog");
433 * That's it for writing, setup a log buffer and we're done.
436 td->iolog_buf = malloc(8192);
437 setvbuf(f, td->iolog_buf, _IOFBF, 8192);
440 * write our version line
442 if (fprintf(f, "%s\n", iolog_ver2) < 0) {
443 perror("iolog init\n");
448 * add all known files
450 for_each_file(td, ff, i)
451 log_file(td, ff, FIO_LOG_ADD_FILE);
456 int init_iolog(struct thread_data *td)
460 if (td->io_ops->flags & FIO_DISKLESSIO)
463 if (td->o.read_iolog_file) {
465 * Check if it's a blktrace file and load that if possible.
466 * Otherwise assume it's a normal log file and load that.
468 if (is_blktrace(td->o.read_iolog_file))
469 ret = load_blktrace(td, td->o.read_iolog_file);
471 ret = init_iolog_read(td);
472 } else if (td->o.write_iolog_file)
473 ret = init_iolog_write(td);
478 void setup_log(struct io_log **log)
480 struct io_log *l = malloc(sizeof(*l));
483 l->max_samples = 1024;
484 l->log = malloc(l->max_samples * sizeof(struct io_sample));
488 void __finish_log(struct io_log *log, const char *name)
493 f = fopen(name, "w");
499 for (i = 0; i < log->nr_samples; i++) {
500 fprintf(f, "%lu, %lu, %u\n", log->log[i].time, log->log[i].val,
509 void finish_log(struct thread_data *td, struct io_log *log, const char *name)
513 snprintf(file_name, 200, "client%d_%s.log", td->thread_number, name);
514 __finish_log(log, file_name);