2 * Code related to writing an iolog of what a thread is doing, and to
3 * later read that back and replay
14 static const char iolog_ver2[] = "fio version 2 iolog";
16 void queue_io_piece(struct thread_data *td, struct io_piece *ipo)
18 flist_add_tail(&ipo->list, &td->io_log_list);
19 td->total_io_size += ipo->len;
22 void log_io_u(struct thread_data *td, struct io_u *io_u)
24 const char *act[] = { "read", "write", "sync", "datasync",
25 "sync_file_range", "wait", "trim" };
27 assert(io_u->ddir <= 6);
29 if (!td->o.write_iolog_file)
32 fprintf(td->iolog_f, "%s %s %llu %lu\n", io_u->file->file_name,
33 act[io_u->ddir], io_u->offset,
37 void log_file(struct thread_data *td, struct fio_file *f,
38 enum file_log_act what)
40 const char *act[] = { "add", "open", "close" };
44 if (!td->o.write_iolog_file)
49 * this happens on the pre-open/close done before the job starts
54 fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
57 static void iolog_delay(struct thread_data *td, unsigned long delay)
59 unsigned long usec = utime_since_now(&td->last_issue);
67 * less than 100 usec delay, just regard it as noise
72 usec_sleep(td, delay);
75 static int ipo_special(struct thread_data *td, struct io_piece *ipo)
83 if (ipo->ddir != DDIR_INVAL)
86 f = td->files[ipo->fileno];
88 switch (ipo->file_action) {
89 case FIO_LOG_OPEN_FILE:
90 ret = td_io_open_file(td, f);
93 td_verror(td, ret, "iolog open file");
95 case FIO_LOG_CLOSE_FILE:
96 td_io_close_file(td, f);
98 case FIO_LOG_UNLINK_FILE:
102 log_err("fio: bad file action %d\n", ipo->file_action);
109 int read_iolog_get(struct thread_data *td, struct io_u *io_u)
111 struct io_piece *ipo;
112 unsigned long elapsed;
114 while (!flist_empty(&td->io_log_list)) {
117 ipo = flist_entry(td->io_log_list.next, struct io_piece, list);
118 flist_del(&ipo->list);
119 remove_trim_entry(td, ipo);
121 ret = ipo_special(td, ipo);
125 } else if (ret > 0) {
130 io_u->ddir = ipo->ddir;
131 if (ipo->ddir != DDIR_WAIT) {
132 io_u->offset = ipo->offset;
133 io_u->buflen = ipo->len;
134 io_u->file = td->files[ipo->fileno];
135 get_file(io_u->file);
136 dprint(FD_IO, "iolog: get %llu/%lu/%s\n", io_u->offset,
137 io_u->buflen, io_u->file->file_name);
139 iolog_delay(td, ipo->delay);
141 elapsed = mtime_since_genesis();
142 if (ipo->delay > elapsed)
143 usec_sleep(td, (ipo->delay - elapsed) * 1000);
148 if (io_u->ddir != DDIR_WAIT)
156 void prune_io_piece_log(struct thread_data *td)
158 struct io_piece *ipo;
161 while ((n = rb_first(&td->io_hist_tree)) != NULL) {
162 ipo = rb_entry(n, struct io_piece, rb_node);
163 rb_erase(n, &td->io_hist_tree);
164 remove_trim_entry(td, ipo);
169 while (!flist_empty(&td->io_hist_list)) {
170 ipo = flist_entry(td->io_hist_list.next, struct io_piece, list);
171 flist_del(&ipo->list);
172 remove_trim_entry(td, ipo);
179 * log a successful write, so we can unwind the log for verify
181 void log_io_piece(struct thread_data *td, struct io_u *io_u)
183 struct rb_node **p, *parent;
184 struct io_piece *ipo, *__ipo;
186 ipo = malloc(sizeof(struct io_piece));
188 ipo->file = io_u->file;
189 ipo->offset = io_u->offset;
190 ipo->len = io_u->buflen;
192 if (io_u_should_trim(td, io_u)) {
193 flist_add_tail(&ipo->trim_list, &td->trim_list);
198 * We don't need to sort the entries, if:
200 * Sequential writes, or
201 * Random writes that lay out the file as it goes along
203 * For both these cases, just reading back data in the order we
204 * wrote it out is the fastest.
206 * One exception is if we don't have a random map AND we are doing
207 * verifies, in that case we need to check for duplicate blocks and
208 * drop the old one, which we rely on the rb insert/lookup for
211 if ((!td_random(td) || !td->o.overwrite) &&
212 (file_randommap(td, ipo->file) || td->o.verify == VERIFY_NONE)) {
213 INIT_FLIST_HEAD(&ipo->list);
214 flist_add_tail(&ipo->list, &td->io_hist_list);
215 ipo->flags |= IP_F_ONLIST;
220 RB_CLEAR_NODE(&ipo->rb_node);
223 * Sort the entry into the verification list
226 p = &td->io_hist_tree.rb_node;
231 __ipo = rb_entry(parent, struct io_piece, rb_node);
232 if (ipo->file < __ipo->file)
234 else if (ipo->file > __ipo->file)
236 else if (ipo->offset < __ipo->offset)
238 else if (ipo->offset > __ipo->offset)
241 assert(ipo->len == __ipo->len);
243 rb_erase(parent, &td->io_hist_tree);
244 remove_trim_entry(td, __ipo);
250 rb_link_node(&ipo->rb_node, parent, p);
251 rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
252 ipo->flags |= IP_F_ONRB;
256 void write_iolog_close(struct thread_data *td)
262 td->iolog_buf = NULL;
266 * Read version 2 iolog data. It is enhanced to include per-file logging,
269 static int read_iolog2(struct thread_data *td, FILE *f)
271 unsigned long long offset;
273 int reads, writes, waits, fileno = 0, file_action = 0; /* stupid gcc */
278 free_release_files(td);
281 * Read in the read iolog and store it, reuse the infrastructure
282 * for doing verifications.
285 fname = malloc(256+16);
286 act = malloc(256+16);
288 reads = writes = waits = 0;
289 while ((p = fgets(str, 4096, f)) != NULL) {
290 struct io_piece *ipo;
293 r = sscanf(p, "%256s %256s %llu %u", fname, act, &offset,
299 if (!strcmp(act, "wait"))
301 else if (!strcmp(act, "read"))
303 else if (!strcmp(act, "write"))
305 else if (!strcmp(act, "sync"))
307 else if (!strcmp(act, "datasync"))
309 else if (!strcmp(act, "trim"))
312 log_err("fio: bad iolog file action: %s\n",
318 if (!strcmp(act, "add")) {
320 fileno = add_file(td, fname);
321 file_action = FIO_LOG_ADD_FILE;
323 } else if (!strcmp(act, "open")) {
324 fileno = get_fileno(td, fname);
325 file_action = FIO_LOG_OPEN_FILE;
326 } else if (!strcmp(act, "close")) {
327 fileno = get_fileno(td, fname);
328 file_action = FIO_LOG_CLOSE_FILE;
330 log_err("fio: bad iolog file action: %s\n",
335 log_err("bad iolog2: %s", p);
341 else if (rw == DDIR_WRITE) {
343 * Don't add a write for ro mode
348 } else if (rw == DDIR_WAIT) {
350 } else if (rw == DDIR_INVAL) {
351 } else if (!ddir_sync(rw)) {
352 log_err("bad ddir: %d\n", rw);
359 ipo = malloc(sizeof(*ipo));
362 if (rw == DDIR_WAIT) {
365 ipo->offset = offset;
367 if (bytes > td->o.max_bs[rw])
368 td->o.max_bs[rw] = bytes;
369 ipo->fileno = fileno;
370 ipo->file_action = file_action;
373 queue_io_piece(td, ipo);
380 if (writes && read_only) {
381 log_err("fio: <%s> skips replay of %d writes due to"
382 " read-only\n", td->o.name, writes);
386 if (!reads && !writes && !waits)
388 else if (reads && !writes)
389 td->o.td_ddir = TD_DDIR_READ;
390 else if (!reads && writes)
391 td->o.td_ddir = TD_DDIR_WRITE;
393 td->o.td_ddir = TD_DDIR_RW;
399 * open iolog, check version, and call appropriate parser
401 static int init_iolog_read(struct thread_data *td)
403 char buffer[256], *p;
407 f = fopen(td->o.read_iolog_file, "r");
409 perror("fopen read iolog");
413 p = fgets(buffer, sizeof(buffer), f);
415 td_verror(td, errno, "iolog read");
416 log_err("fio: unable to read iolog\n");
422 * version 2 of the iolog stores a specific string as the
423 * first line, check for that
425 if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
426 ret = read_iolog2(td, f);
428 log_err("fio: iolog version 1 is no longer supported\n");
437 * Set up a log for storing io patterns.
439 static int init_iolog_write(struct thread_data *td)
445 f = fopen(td->o.write_iolog_file, "a");
447 perror("fopen write iolog");
452 * That's it for writing, setup a log buffer and we're done.
455 td->iolog_buf = malloc(8192);
456 setvbuf(f, td->iolog_buf, _IOFBF, 8192);
459 * write our version line
461 if (fprintf(f, "%s\n", iolog_ver2) < 0) {
462 perror("iolog init\n");
467 * add all known files
469 for_each_file(td, ff, i)
470 log_file(td, ff, FIO_LOG_ADD_FILE);
475 int init_iolog(struct thread_data *td)
479 if (td->o.read_iolog_file) {
481 * Check if it's a blktrace file and load that if possible.
482 * Otherwise assume it's a normal log file and load that.
484 if (is_blktrace(td->o.read_iolog_file))
485 ret = load_blktrace(td, td->o.read_iolog_file);
487 ret = init_iolog_read(td);
488 } else if (td->o.write_iolog_file)
489 ret = init_iolog_write(td);
494 void setup_log(struct io_log **log, unsigned long avg_msec, int log_type)
496 struct io_log *l = malloc(sizeof(*l));
498 memset(l, 0, sizeof(*l));
500 l->max_samples = 1024;
501 l->log_type = log_type;
502 l->log = malloc(l->max_samples * sizeof(struct io_sample));
503 l->avg_msec = avg_msec;
507 void __finish_log(struct io_log *log, const char *name)
512 f = fopen(name, "a");
518 for (i = 0; i < log->nr_samples; i++) {
519 fprintf(f, "%lu, %lu, %u, %u\n",
520 (unsigned long) log->log[i].time,
521 (unsigned long) log->log[i].val,
522 log->log[i].ddir, log->log[i].bs);
530 void finish_log_named(struct thread_data *td, struct io_log *log,
531 const char *prefix, const char *postfix)
533 char file_name[256], *p;
535 snprintf(file_name, 200, "%s_%s.log", prefix, postfix);
536 p = basename(file_name);
538 if (td->client_type == FIO_CLIENT_TYPE_GUI) {
539 fio_send_iolog(td, log, p);
543 __finish_log(log, p);
546 void finish_log(struct thread_data *td, struct io_log *log, const char *name)
548 finish_log_named(td, log, td->o.name, name);