49d6bc7cb2cc7da2f9842cca78150a732ad07c6a
[fio.git] / backend.c
1 /*
2  * fio - the flexible io tester
3  *
4  * Copyright (C) 2005 Jens Axboe <axboe@suse.de>
5  * Copyright (C) 2006-2012 Jens Axboe <axboe@kernel.dk>
6  *
7  * The license below covers all files distributed with fio unless otherwise
8  * noted in the file itself.
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License version 2 as
12  *  published by the Free Software Foundation.
13  *
14  *  This program is distributed in the hope that it will be useful,
15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  *  GNU General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License
20  *  along with this program; if not, write to the Free Software
21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
22  *
23  */
24 #include <unistd.h>
25 #include <fcntl.h>
26 #include <string.h>
27 #include <limits.h>
28 #include <signal.h>
29 #include <time.h>
30 #include <locale.h>
31 #include <assert.h>
32 #include <time.h>
33 #include <inttypes.h>
34 #include <sys/stat.h>
35 #include <sys/wait.h>
36 #include <sys/ipc.h>
37 #ifndef FIO_NO_HAVE_SHM_H
38 #include <sys/shm.h>
39 #endif
40 #include <sys/mman.h>
41
42 #include "fio.h"
43 #include "hash.h"
44 #include "smalloc.h"
45 #include "verify.h"
46 #include "trim.h"
47 #include "diskutil.h"
48 #include "cgroup.h"
49 #include "profile.h"
50 #include "lib/rand.h"
51 #include "memalign.h"
52 #include "server.h"
53 #include "lib/getrusage.h"
54 #include "idletime.h"
55
56 static pthread_t disk_util_thread;
57 static struct fio_mutex *disk_thread_mutex;
58 static struct fio_mutex *startup_mutex;
59 static struct fio_mutex *writeout_mutex;
60 static struct flist_head *cgroup_list;
61 static char *cgroup_mnt;
62 static int exit_value;
63 static volatile int fio_abort;
64 static unsigned int nr_process = 0;
65 static unsigned int nr_thread = 0;
66
67 struct io_log *agg_io_log[DDIR_RWDIR_CNT];
68
69 int groupid = 0;
70 unsigned int thread_number = 0;
71 unsigned int stat_number = 0;
72 int shm_id = 0;
73 int temp_stall_ts;
74 unsigned long done_secs = 0;
75 volatile int disk_util_exit = 0;
76
77 #define PAGE_ALIGN(buf) \
78         (char *) (((uintptr_t) (buf) + page_mask) & ~page_mask)
79
80 #define JOB_START_TIMEOUT       (5 * 1000)
81
82 static void sig_int(int sig)
83 {
84         if (threads) {
85                 if (is_backend)
86                         fio_server_got_signal(sig);
87                 else {
88                         log_info("\nfio: terminating on signal %d\n", sig);
89                         fflush(stdout);
90                         exit_value = 128;
91                 }
92
93                 fio_terminate_threads(TERMINATE_ALL);
94         }
95 }
96
97 static void sig_show_status(int sig)
98 {
99         show_running_run_stats();
100 }
101
102 static void set_sig_handlers(void)
103 {
104         struct sigaction act;
105
106         memset(&act, 0, sizeof(act));
107         act.sa_handler = sig_int;
108         act.sa_flags = SA_RESTART;
109         sigaction(SIGINT, &act, NULL);
110
111         memset(&act, 0, sizeof(act));
112         act.sa_handler = sig_int;
113         act.sa_flags = SA_RESTART;
114         sigaction(SIGTERM, &act, NULL);
115
116 /* Windows uses SIGBREAK as a quit signal from other applications */
117 #ifdef WIN32
118         memset(&act, 0, sizeof(act));
119         act.sa_handler = sig_int;
120         act.sa_flags = SA_RESTART;
121         sigaction(SIGBREAK, &act, NULL);
122 #endif
123
124         memset(&act, 0, sizeof(act));
125         act.sa_handler = sig_show_status;
126         act.sa_flags = SA_RESTART;
127         sigaction(SIGUSR1, &act, NULL);
128
129         if (is_backend) {
130                 memset(&act, 0, sizeof(act));
131                 act.sa_handler = sig_int;
132                 act.sa_flags = SA_RESTART;
133                 sigaction(SIGPIPE, &act, NULL);
134         }
135 }
136
137 /*
138  * Check if we are above the minimum rate given.
139  */
140 static int __check_min_rate(struct thread_data *td, struct timeval *now,
141                             enum fio_ddir ddir)
142 {
143         unsigned long long bytes = 0;
144         unsigned long iops = 0;
145         unsigned long spent;
146         unsigned long rate;
147         unsigned int ratemin = 0;
148         unsigned int rate_iops = 0;
149         unsigned int rate_iops_min = 0;
150
151         assert(ddir_rw(ddir));
152
153         if (!td->o.ratemin[ddir] && !td->o.rate_iops_min[ddir])
154                 return 0;
155
156         /*
157          * allow a 2 second settle period in the beginning
158          */
159         if (mtime_since(&td->start, now) < 2000)
160                 return 0;
161
162         iops += td->this_io_blocks[ddir];
163         bytes += td->this_io_bytes[ddir];
164         ratemin += td->o.ratemin[ddir];
165         rate_iops += td->o.rate_iops[ddir];
166         rate_iops_min += td->o.rate_iops_min[ddir];
167
168         /*
169          * if rate blocks is set, sample is running
170          */
171         if (td->rate_bytes[ddir] || td->rate_blocks[ddir]) {
172                 spent = mtime_since(&td->lastrate[ddir], now);
173                 if (spent < td->o.ratecycle)
174                         return 0;
175
176                 if (td->o.rate[ddir]) {
177                         /*
178                          * check bandwidth specified rate
179                          */
180                         if (bytes < td->rate_bytes[ddir]) {
181                                 log_err("%s: min rate %u not met\n", td->o.name,
182                                                                 ratemin);
183                                 return 1;
184                         } else {
185                                 rate = ((bytes - td->rate_bytes[ddir]) * 1000) / spent;
186                                 if (rate < ratemin ||
187                                     bytes < td->rate_bytes[ddir]) {
188                                         log_err("%s: min rate %u not met, got"
189                                                 " %luKB/sec\n", td->o.name,
190                                                         ratemin, rate);
191                                         return 1;
192                                 }
193                         }
194                 } else {
195                         /*
196                          * checks iops specified rate
197                          */
198                         if (iops < rate_iops) {
199                                 log_err("%s: min iops rate %u not met\n",
200                                                 td->o.name, rate_iops);
201                                 return 1;
202                         } else {
203                                 rate = ((iops - td->rate_blocks[ddir]) * 1000) / spent;
204                                 if (rate < rate_iops_min ||
205                                     iops < td->rate_blocks[ddir]) {
206                                         log_err("%s: min iops rate %u not met,"
207                                                 " got %lu\n", td->o.name,
208                                                         rate_iops_min, rate);
209                                 }
210                         }
211                 }
212         }
213
214         td->rate_bytes[ddir] = bytes;
215         td->rate_blocks[ddir] = iops;
216         memcpy(&td->lastrate[ddir], now, sizeof(*now));
217         return 0;
218 }
219
220 static int check_min_rate(struct thread_data *td, struct timeval *now,
221                           uint64_t *bytes_done)
222 {
223         int ret = 0;
224
225         if (bytes_done[DDIR_READ])
226                 ret |= __check_min_rate(td, now, DDIR_READ);
227         if (bytes_done[DDIR_WRITE])
228                 ret |= __check_min_rate(td, now, DDIR_WRITE);
229         if (bytes_done[DDIR_TRIM])
230                 ret |= __check_min_rate(td, now, DDIR_TRIM);
231
232         return ret;
233 }
234
235 /*
236  * When job exits, we can cancel the in-flight IO if we are using async
237  * io. Attempt to do so.
238  */
239 static void cleanup_pending_aio(struct thread_data *td)
240 {
241         struct flist_head *entry, *n;
242         struct io_u *io_u;
243         int r;
244
245         /*
246          * get immediately available events, if any
247          */
248         r = io_u_queued_complete(td, 0, NULL);
249         if (r < 0)
250                 return;
251
252         /*
253          * now cancel remaining active events
254          */
255         if (td->io_ops->cancel) {
256                 flist_for_each_safe(entry, n, &td->io_u_busylist) {
257                         io_u = flist_entry(entry, struct io_u, list);
258
259                         /*
260                          * if the io_u isn't in flight, then that generally
261                          * means someone leaked an io_u. complain but fix
262                          * it up, so we don't stall here.
263                          */
264                         if ((io_u->flags & IO_U_F_FLIGHT) == 0) {
265                                 log_err("fio: non-busy IO on busy list\n");
266                                 put_io_u(td, io_u);
267                         } else {
268                                 r = td->io_ops->cancel(td, io_u);
269                                 if (!r)
270                                         put_io_u(td, io_u);
271                         }
272                 }
273         }
274
275         if (td->cur_depth)
276                 r = io_u_queued_complete(td, td->cur_depth, NULL);
277 }
278
279 /*
280  * Helper to handle the final sync of a file. Works just like the normal
281  * io path, just does everything sync.
282  */
283 static int fio_io_sync(struct thread_data *td, struct fio_file *f)
284 {
285         struct io_u *io_u = __get_io_u(td);
286         int ret;
287
288         if (!io_u)
289                 return 1;
290
291         io_u->ddir = DDIR_SYNC;
292         io_u->file = f;
293
294         if (td_io_prep(td, io_u)) {
295                 put_io_u(td, io_u);
296                 return 1;
297         }
298
299 requeue:
300         ret = td_io_queue(td, io_u);
301         if (ret < 0) {
302                 td_verror(td, io_u->error, "td_io_queue");
303                 put_io_u(td, io_u);
304                 return 1;
305         } else if (ret == FIO_Q_QUEUED) {
306                 if (io_u_queued_complete(td, 1, NULL) < 0)
307                         return 1;
308         } else if (ret == FIO_Q_COMPLETED) {
309                 if (io_u->error) {
310                         td_verror(td, io_u->error, "td_io_queue");
311                         return 1;
312                 }
313
314                 if (io_u_sync_complete(td, io_u, NULL) < 0)
315                         return 1;
316         } else if (ret == FIO_Q_BUSY) {
317                 if (td_io_commit(td))
318                         return 1;
319                 goto requeue;
320         }
321
322         return 0;
323 }
324
325 static inline void __update_tv_cache(struct thread_data *td)
326 {
327         fio_gettime(&td->tv_cache, NULL);
328 }
329
330 static inline void update_tv_cache(struct thread_data *td)
331 {
332         if ((++td->tv_cache_nr & td->tv_cache_mask) == td->tv_cache_mask)
333                 __update_tv_cache(td);
334 }
335
336 static inline int runtime_exceeded(struct thread_data *td, struct timeval *t)
337 {
338         if (in_ramp_time(td))
339                 return 0;
340         if (!td->o.timeout)
341                 return 0;
342         if (mtime_since(&td->epoch, t) >= td->o.timeout * 1000)
343                 return 1;
344
345         return 0;
346 }
347
348 static int break_on_this_error(struct thread_data *td, enum fio_ddir ddir,
349                                int *retptr)
350 {
351         int ret = *retptr;
352
353         if (ret < 0 || td->error) {
354                 int err = td->error;
355                 enum error_type_bit eb;
356
357                 if (ret < 0)
358                         err = -ret;
359
360                 eb = td_error_type(ddir, err);
361                 if (!(td->o.continue_on_error & (1 << eb)))
362                         return 1;
363
364                 if (td_non_fatal_error(td, eb, err)) {
365                         /*
366                          * Continue with the I/Os in case of
367                          * a non fatal error.
368                          */
369                         update_error_count(td, err);
370                         td_clear_error(td);
371                         *retptr = 0;
372                         return 0;
373                 } else if (td->o.fill_device && err == ENOSPC) {
374                         /*
375                          * We expect to hit this error if
376                          * fill_device option is set.
377                          */
378                         td_clear_error(td);
379                         td->terminate = 1;
380                         return 1;
381                 } else {
382                         /*
383                          * Stop the I/O in case of a fatal
384                          * error.
385                          */
386                         update_error_count(td, err);
387                         return 1;
388                 }
389         }
390
391         return 0;
392 }
393
394 /*
395  * The main verify engine. Runs over the writes we previously submitted,
396  * reads the blocks back in, and checks the crc/md5 of the data.
397  */
398 static void do_verify(struct thread_data *td, uint64_t verify_bytes)
399 {
400         uint64_t bytes_done[DDIR_RWDIR_CNT] = { 0, 0, 0 };
401         struct fio_file *f;
402         struct io_u *io_u;
403         int ret, min_events;
404         unsigned int i;
405
406         dprint(FD_VERIFY, "starting loop\n");
407
408         /*
409          * sync io first and invalidate cache, to make sure we really
410          * read from disk.
411          */
412         for_each_file(td, f, i) {
413                 if (!fio_file_open(f))
414                         continue;
415                 if (fio_io_sync(td, f))
416                         break;
417                 if (file_invalidate_cache(td, f))
418                         break;
419         }
420
421         if (td->error)
422                 return;
423
424         td_set_runstate(td, TD_VERIFYING);
425
426         io_u = NULL;
427         while (!td->terminate) {
428                 enum fio_ddir ddir;
429                 int ret2, full;
430
431                 update_tv_cache(td);
432
433                 if (runtime_exceeded(td, &td->tv_cache)) {
434                         __update_tv_cache(td);
435                         if (runtime_exceeded(td, &td->tv_cache)) {
436                                 td->terminate = 1;
437                                 break;
438                         }
439                 }
440
441                 if (flow_threshold_exceeded(td))
442                         continue;
443
444                 if (!td->o.experimental_verify) {
445                         io_u = __get_io_u(td);
446                         if (!io_u)
447                                 break;
448
449                         if (get_next_verify(td, io_u)) {
450                                 put_io_u(td, io_u);
451                                 break;
452                         }
453
454                         if (td_io_prep(td, io_u)) {
455                                 put_io_u(td, io_u);
456                                 break;
457                         }
458                 } else {
459                         if (ddir_rw_sum(bytes_done) + td->o.rw_min_bs > verify_bytes)
460                                 break;
461
462                         while ((io_u = get_io_u(td)) != NULL) {
463                                 /*
464                                  * We are only interested in the places where
465                                  * we wrote or trimmed IOs. Turn those into
466                                  * reads for verification purposes.
467                                  */
468                                 if (io_u->ddir == DDIR_READ) {
469                                         /*
470                                          * Pretend we issued it for rwmix
471                                          * accounting
472                                          */
473                                         td->io_issues[DDIR_READ]++;
474                                         put_io_u(td, io_u);
475                                         continue;
476                                 } else if (io_u->ddir == DDIR_TRIM) {
477                                         io_u->ddir = DDIR_READ;
478                                         io_u->flags |= IO_U_F_TRIMMED;
479                                         break;
480                                 } else if (io_u->ddir == DDIR_WRITE) {
481                                         io_u->ddir = DDIR_READ;
482                                         break;
483                                 } else {
484                                         put_io_u(td, io_u);
485                                         continue;
486                                 }
487                         }
488
489                         if (!io_u)
490                                 break;
491                 }
492
493                 if (td->o.verify_async)
494                         io_u->end_io = verify_io_u_async;
495                 else
496                         io_u->end_io = verify_io_u;
497
498                 ddir = io_u->ddir;
499
500                 ret = td_io_queue(td, io_u);
501                 switch (ret) {
502                 case FIO_Q_COMPLETED:
503                         if (io_u->error) {
504                                 ret = -io_u->error;
505                                 clear_io_u(td, io_u);
506                         } else if (io_u->resid) {
507                                 int bytes = io_u->xfer_buflen - io_u->resid;
508
509                                 /*
510                                  * zero read, fail
511                                  */
512                                 if (!bytes) {
513                                         td_verror(td, EIO, "full resid");
514                                         put_io_u(td, io_u);
515                                         break;
516                                 }
517
518                                 io_u->xfer_buflen = io_u->resid;
519                                 io_u->xfer_buf += bytes;
520                                 io_u->offset += bytes;
521
522                                 if (ddir_rw(io_u->ddir))
523                                         td->ts.short_io_u[io_u->ddir]++;
524
525                                 f = io_u->file;
526                                 if (io_u->offset == f->real_file_size)
527                                         goto sync_done;
528
529                                 requeue_io_u(td, &io_u);
530                         } else {
531 sync_done:
532                                 ret = io_u_sync_complete(td, io_u, bytes_done);
533                                 if (ret < 0)
534                                         break;
535                         }
536                         continue;
537                 case FIO_Q_QUEUED:
538                         break;
539                 case FIO_Q_BUSY:
540                         requeue_io_u(td, &io_u);
541                         ret2 = td_io_commit(td);
542                         if (ret2 < 0)
543                                 ret = ret2;
544                         break;
545                 default:
546                         assert(ret < 0);
547                         td_verror(td, -ret, "td_io_queue");
548                         break;
549                 }
550
551                 if (break_on_this_error(td, ddir, &ret))
552                         break;
553
554                 /*
555                  * if we can queue more, do so. but check if there are
556                  * completed io_u's first. Note that we can get BUSY even
557                  * without IO queued, if the system is resource starved.
558                  */
559                 full = queue_full(td) || (ret == FIO_Q_BUSY && td->cur_depth);
560                 if (full || !td->o.iodepth_batch_complete) {
561                         min_events = min(td->o.iodepth_batch_complete,
562                                          td->cur_depth);
563                         /*
564                          * if the queue is full, we MUST reap at least 1 event
565                          */
566                         if (full && !min_events)
567                                 min_events = 1;
568
569                         do {
570                                 /*
571                                  * Reap required number of io units, if any,
572                                  * and do the verification on them through
573                                  * the callback handler
574                                  */
575                                 if (io_u_queued_complete(td, min_events, bytes_done) < 0) {
576                                         ret = -1;
577                                         break;
578                                 }
579                         } while (full && (td->cur_depth > td->o.iodepth_low));
580                 }
581                 if (ret < 0)
582                         break;
583         }
584
585         if (!td->error) {
586                 min_events = td->cur_depth;
587
588                 if (min_events)
589                         ret = io_u_queued_complete(td, min_events, NULL);
590         } else
591                 cleanup_pending_aio(td);
592
593         td_set_runstate(td, TD_RUNNING);
594
595         dprint(FD_VERIFY, "exiting loop\n");
596 }
597
598 static int io_bytes_exceeded(struct thread_data *td)
599 {
600         unsigned long long bytes;
601
602         if (td_rw(td))
603                 bytes = td->this_io_bytes[DDIR_READ] + td->this_io_bytes[DDIR_WRITE];
604         else if (td_write(td))
605                 bytes = td->this_io_bytes[DDIR_WRITE];
606         else if (td_read(td))
607                 bytes = td->this_io_bytes[DDIR_READ];
608         else
609                 bytes = td->this_io_bytes[DDIR_TRIM];
610
611         return bytes >= td->o.size;
612 }
613
614 /*
615  * Main IO worker function. It retrieves io_u's to process and queues
616  * and reaps them, checking for rate and errors along the way.
617  *
618  * Returns number of bytes written and trimmed.
619  */
620 static uint64_t do_io(struct thread_data *td)
621 {
622         uint64_t bytes_done[DDIR_RWDIR_CNT] = { 0, 0, 0 };
623         unsigned int i;
624         int ret = 0;
625
626         if (in_ramp_time(td))
627                 td_set_runstate(td, TD_RAMP);
628         else
629                 td_set_runstate(td, TD_RUNNING);
630
631         while ((td->o.read_iolog_file && !flist_empty(&td->io_log_list)) ||
632                 (!flist_empty(&td->trim_list)) || !io_bytes_exceeded(td) ||
633                 td->o.time_based) {
634                 struct timeval comp_time;
635                 int min_evts = 0;
636                 struct io_u *io_u;
637                 int ret2, full;
638                 enum fio_ddir ddir;
639
640                 if (td->terminate || td->done)
641                         break;
642
643                 update_tv_cache(td);
644
645                 if (runtime_exceeded(td, &td->tv_cache)) {
646                         __update_tv_cache(td);
647                         if (runtime_exceeded(td, &td->tv_cache)) {
648                                 td->terminate = 1;
649                                 break;
650                         }
651                 }
652
653                 if (flow_threshold_exceeded(td))
654                         continue;
655
656                 io_u = get_io_u(td);
657                 if (!io_u)
658                         break;
659
660                 ddir = io_u->ddir;
661
662                 /*
663                  * Add verification end_io handler if:
664                  *      - Asked to verify (!td_rw(td))
665                  *      - Or the io_u is from our verify list (mixed write/ver)
666                  */
667                 if (td->o.verify != VERIFY_NONE && io_u->ddir == DDIR_READ &&
668                     ((io_u->flags & IO_U_F_VER_LIST) || !td_rw(td))) {
669                         if (td->o.verify_async)
670                                 io_u->end_io = verify_io_u_async;
671                         else
672                                 io_u->end_io = verify_io_u;
673                         td_set_runstate(td, TD_VERIFYING);
674                 } else if (in_ramp_time(td))
675                         td_set_runstate(td, TD_RAMP);
676                 else
677                         td_set_runstate(td, TD_RUNNING);
678
679                 ret = td_io_queue(td, io_u);
680                 switch (ret) {
681                 case FIO_Q_COMPLETED:
682                         if (io_u->error) {
683                                 ret = -io_u->error;
684                                 clear_io_u(td, io_u);
685                         } else if (io_u->resid) {
686                                 int bytes = io_u->xfer_buflen - io_u->resid;
687                                 struct fio_file *f = io_u->file;
688
689                                 /*
690                                  * zero read, fail
691                                  */
692                                 if (!bytes) {
693                                         td_verror(td, EIO, "full resid");
694                                         put_io_u(td, io_u);
695                                         break;
696                                 }
697
698                                 io_u->xfer_buflen = io_u->resid;
699                                 io_u->xfer_buf += bytes;
700                                 io_u->offset += bytes;
701
702                                 if (ddir_rw(io_u->ddir))
703                                         td->ts.short_io_u[io_u->ddir]++;
704
705                                 if (io_u->offset == f->real_file_size)
706                                         goto sync_done;
707
708                                 requeue_io_u(td, &io_u);
709                         } else {
710 sync_done:
711                                 if (__should_check_rate(td, DDIR_READ) ||
712                                     __should_check_rate(td, DDIR_WRITE) ||
713                                     __should_check_rate(td, DDIR_TRIM))
714                                         fio_gettime(&comp_time, NULL);
715
716                                 ret = io_u_sync_complete(td, io_u, bytes_done);
717                                 if (ret < 0)
718                                         break;
719                         }
720                         break;
721                 case FIO_Q_QUEUED:
722                         /*
723                          * if the engine doesn't have a commit hook,
724                          * the io_u is really queued. if it does have such
725                          * a hook, it has to call io_u_queued() itself.
726                          */
727                         if (td->io_ops->commit == NULL)
728                                 io_u_queued(td, io_u);
729                         break;
730                 case FIO_Q_BUSY:
731                         requeue_io_u(td, &io_u);
732                         ret2 = td_io_commit(td);
733                         if (ret2 < 0)
734                                 ret = ret2;
735                         break;
736                 default:
737                         assert(ret < 0);
738                         put_io_u(td, io_u);
739                         break;
740                 }
741
742                 if (break_on_this_error(td, ddir, &ret))
743                         break;
744
745                 /*
746                  * See if we need to complete some commands. Note that we
747                  * can get BUSY even without IO queued, if the system is
748                  * resource starved.
749                  */
750                 full = queue_full(td) || (ret == FIO_Q_BUSY && td->cur_depth);
751                 if (full || !td->o.iodepth_batch_complete) {
752                         min_evts = min(td->o.iodepth_batch_complete,
753                                         td->cur_depth);
754                         /*
755                          * if the queue is full, we MUST reap at least 1 event
756                          */
757                         if (full && !min_evts)
758                                 min_evts = 1;
759
760                         if (__should_check_rate(td, DDIR_READ) ||
761                             __should_check_rate(td, DDIR_WRITE) ||
762                             __should_check_rate(td, DDIR_TRIM))
763                                 fio_gettime(&comp_time, NULL);
764
765                         do {
766                                 ret = io_u_queued_complete(td, min_evts, bytes_done);
767                                 if (ret < 0)
768                                         break;
769
770                         } while (full && (td->cur_depth > td->o.iodepth_low));
771                 }
772
773                 if (ret < 0)
774                         break;
775                 if (!ddir_rw_sum(bytes_done) && !(td->io_ops->flags & FIO_NOIO))
776                         continue;
777
778                 if (!in_ramp_time(td) && should_check_rate(td, bytes_done)) {
779                         if (check_min_rate(td, &comp_time, bytes_done)) {
780                                 if (exitall_on_terminate)
781                                         fio_terminate_threads(td->groupid);
782                                 td_verror(td, EIO, "check_min_rate");
783                                 break;
784                         }
785                 }
786
787                 if (td->o.thinktime) {
788                         unsigned long long b;
789
790                         b = ddir_rw_sum(td->io_blocks);
791                         if (!(b % td->o.thinktime_blocks)) {
792                                 int left;
793
794                                 if (td->o.thinktime_spin)
795                                         usec_spin(td->o.thinktime_spin);
796
797                                 left = td->o.thinktime - td->o.thinktime_spin;
798                                 if (left)
799                                         usec_sleep(td, left);
800                         }
801                 }
802         }
803
804         if (td->trim_entries)
805                 log_err("fio: %d trim entries leaked?\n", td->trim_entries);
806
807         if (td->o.fill_device && td->error == ENOSPC) {
808                 td->error = 0;
809                 td->terminate = 1;
810         }
811         if (!td->error) {
812                 struct fio_file *f;
813
814                 i = td->cur_depth;
815                 if (i) {
816                         ret = io_u_queued_complete(td, i, NULL);
817                         if (td->o.fill_device && td->error == ENOSPC)
818                                 td->error = 0;
819                 }
820
821                 if (should_fsync(td) && td->o.end_fsync) {
822                         td_set_runstate(td, TD_FSYNCING);
823
824                         for_each_file(td, f, i) {
825                                 if (!fio_file_open(f))
826                                         continue;
827                                 fio_io_sync(td, f);
828                         }
829                 }
830         } else
831                 cleanup_pending_aio(td);
832
833         /*
834          * stop job if we failed doing any IO
835          */
836         if (!ddir_rw_sum(td->this_io_bytes))
837                 td->done = 1;
838
839         return bytes_done[DDIR_WRITE] + bytes_done[DDIR_TRIM];
840 }
841
842 static void cleanup_io_u(struct thread_data *td)
843 {
844         struct flist_head *entry, *n;
845         struct io_u *io_u;
846
847         flist_for_each_safe(entry, n, &td->io_u_freelist) {
848                 io_u = flist_entry(entry, struct io_u, list);
849
850                 flist_del(&io_u->list);
851
852                 if (td->io_ops->io_u_free)
853                         td->io_ops->io_u_free(td, io_u);
854
855                 fio_memfree(io_u, sizeof(*io_u));
856         }
857
858         free_io_mem(td);
859 }
860
861 static int init_io_u(struct thread_data *td)
862 {
863         struct io_u *io_u;
864         unsigned int max_bs, min_write;
865         int cl_align, i, max_units;
866         int data_xfer = 1;
867         char *p;
868
869         max_units = td->o.iodepth;
870         max_bs = max(td->o.max_bs[DDIR_READ], td->o.max_bs[DDIR_WRITE]);
871         max_bs = max(td->o.max_bs[DDIR_TRIM], max_bs);
872         min_write = td->o.min_bs[DDIR_WRITE];
873         td->orig_buffer_size = (unsigned long long) max_bs
874                                         * (unsigned long long) max_units;
875
876         if ((td->io_ops->flags & FIO_NOIO) || !(td_read(td) || td_write(td)))
877                 data_xfer = 0;
878
879         if (td->o.mem_type == MEM_SHMHUGE || td->o.mem_type == MEM_MMAPHUGE) {
880                 unsigned long bs;
881
882                 bs = td->orig_buffer_size + td->o.hugepage_size - 1;
883                 td->orig_buffer_size = bs & ~(td->o.hugepage_size - 1);
884         }
885
886         if (td->orig_buffer_size != (size_t) td->orig_buffer_size) {
887                 log_err("fio: IO memory too large. Reduce max_bs or iodepth\n");
888                 return 1;
889         }
890
891         if (data_xfer && allocate_io_mem(td))
892                 return 1;
893
894         if (td->o.odirect || td->o.mem_align ||
895             (td->io_ops->flags & FIO_RAWIO))
896                 p = PAGE_ALIGN(td->orig_buffer) + td->o.mem_align;
897         else
898                 p = td->orig_buffer;
899
900         cl_align = os_cache_line_size();
901
902         for (i = 0; i < max_units; i++) {
903                 void *ptr;
904
905                 if (td->terminate)
906                         return 1;
907
908                 ptr = fio_memalign(cl_align, sizeof(*io_u));
909                 if (!ptr) {
910                         log_err("fio: unable to allocate aligned memory\n");
911                         break;
912                 }
913
914                 io_u = ptr;
915                 memset(io_u, 0, sizeof(*io_u));
916                 INIT_FLIST_HEAD(&io_u->list);
917                 dprint(FD_MEM, "io_u alloc %p, index %u\n", io_u, i);
918
919                 if (data_xfer) {
920                         io_u->buf = p;
921                         dprint(FD_MEM, "io_u %p, mem %p\n", io_u, io_u->buf);
922
923                         if (td_write(td))
924                                 io_u_fill_buffer(td, io_u, min_write, max_bs);
925                         if (td_write(td) && td->o.verify_pattern_bytes) {
926                                 /*
927                                  * Fill the buffer with the pattern if we are
928                                  * going to be doing writes.
929                                  */
930                                 fill_pattern(td, io_u->buf, max_bs, io_u, 0, 0);
931                         }
932                 }
933
934                 io_u->index = i;
935                 io_u->flags = IO_U_F_FREE;
936                 flist_add(&io_u->list, &td->io_u_freelist);
937
938                 if (td->io_ops->io_u_init) {
939                         int ret = td->io_ops->io_u_init(td, io_u);
940
941                         if (ret) {
942                                 log_err("fio: failed to init engine data: %d\n", ret);
943                                 return 1;
944                         }
945                 }
946
947                 p += max_bs;
948         }
949
950         return 0;
951 }
952
953 static int switch_ioscheduler(struct thread_data *td)
954 {
955         char tmp[256], tmp2[128];
956         FILE *f;
957         int ret;
958
959         if (td->io_ops->flags & FIO_DISKLESSIO)
960                 return 0;
961
962         sprintf(tmp, "%s/queue/scheduler", td->sysfs_root);
963
964         f = fopen(tmp, "r+");
965         if (!f) {
966                 if (errno == ENOENT) {
967                         log_err("fio: os or kernel doesn't support IO scheduler"
968                                 " switching\n");
969                         return 0;
970                 }
971                 td_verror(td, errno, "fopen iosched");
972                 return 1;
973         }
974
975         /*
976          * Set io scheduler.
977          */
978         ret = fwrite(td->o.ioscheduler, strlen(td->o.ioscheduler), 1, f);
979         if (ferror(f) || ret != 1) {
980                 td_verror(td, errno, "fwrite");
981                 fclose(f);
982                 return 1;
983         }
984
985         rewind(f);
986
987         /*
988          * Read back and check that the selected scheduler is now the default.
989          */
990         ret = fread(tmp, 1, sizeof(tmp), f);
991         if (ferror(f) || ret < 0) {
992                 td_verror(td, errno, "fread");
993                 fclose(f);
994                 return 1;
995         }
996
997         sprintf(tmp2, "[%s]", td->o.ioscheduler);
998         if (!strstr(tmp, tmp2)) {
999                 log_err("fio: io scheduler %s not found\n", td->o.ioscheduler);
1000                 td_verror(td, EINVAL, "iosched_switch");
1001                 fclose(f);
1002                 return 1;
1003         }
1004
1005         fclose(f);
1006         return 0;
1007 }
1008
1009 static int keep_running(struct thread_data *td)
1010 {
1011         if (td->done)
1012                 return 0;
1013         if (td->o.time_based)
1014                 return 1;
1015         if (td->o.loops) {
1016                 td->o.loops--;
1017                 return 1;
1018         }
1019
1020         if (ddir_rw_sum(td->io_bytes) < td->o.size)
1021                 return 1;
1022
1023         return 0;
1024 }
1025
1026 static int exec_string(const char *string)
1027 {
1028         int ret, newlen = strlen(string) + 1 + 8;
1029         char *str;
1030
1031         str = malloc(newlen);
1032         sprintf(str, "sh -c %s", string);
1033
1034         ret = system(str);
1035         if (ret == -1)
1036                 log_err("fio: exec of cmd <%s> failed\n", str);
1037
1038         free(str);
1039         return ret;
1040 }
1041
1042 /*
1043  * Entry point for the thread based jobs. The process based jobs end up
1044  * here as well, after a little setup.
1045  */
1046 static void *thread_main(void *data)
1047 {
1048         unsigned long long elapsed;
1049         struct thread_data *td = data;
1050         struct thread_options *o = &td->o;
1051         pthread_condattr_t attr;
1052         int clear_state;
1053         int ret;
1054
1055         if (!o->use_thread) {
1056                 setsid();
1057                 td->pid = getpid();
1058         } else
1059                 td->pid = gettid();
1060
1061         fio_local_clock_init(td->o.use_thread);
1062
1063         dprint(FD_PROCESS, "jobs pid=%d started\n", (int) td->pid);
1064
1065         if (is_backend)
1066                 fio_server_send_start(td);
1067
1068         INIT_FLIST_HEAD(&td->io_u_freelist);
1069         INIT_FLIST_HEAD(&td->io_u_busylist);
1070         INIT_FLIST_HEAD(&td->io_u_requeues);
1071         INIT_FLIST_HEAD(&td->io_log_list);
1072         INIT_FLIST_HEAD(&td->io_hist_list);
1073         INIT_FLIST_HEAD(&td->verify_list);
1074         INIT_FLIST_HEAD(&td->trim_list);
1075         INIT_FLIST_HEAD(&td->next_rand_list);
1076         pthread_mutex_init(&td->io_u_lock, NULL);
1077         td->io_hist_tree = RB_ROOT;
1078
1079         pthread_condattr_init(&attr);
1080         pthread_cond_init(&td->verify_cond, &attr);
1081         pthread_cond_init(&td->free_cond, &attr);
1082
1083         td_set_runstate(td, TD_INITIALIZED);
1084         dprint(FD_MUTEX, "up startup_mutex\n");
1085         fio_mutex_up(startup_mutex);
1086         dprint(FD_MUTEX, "wait on td->mutex\n");
1087         fio_mutex_down(td->mutex);
1088         dprint(FD_MUTEX, "done waiting on td->mutex\n");
1089
1090         /*
1091          * the ->mutex mutex is now no longer used, close it to avoid
1092          * eating a file descriptor
1093          */
1094         fio_mutex_remove(td->mutex);
1095         td->mutex = NULL;
1096
1097         /*
1098          * A new gid requires privilege, so we need to do this before setting
1099          * the uid.
1100          */
1101         if (o->gid != -1U && setgid(o->gid)) {
1102                 td_verror(td, errno, "setgid");
1103                 goto err;
1104         }
1105         if (o->uid != -1U && setuid(o->uid)) {
1106                 td_verror(td, errno, "setuid");
1107                 goto err;
1108         }
1109
1110         /*
1111          * If we have a gettimeofday() thread, make sure we exclude that
1112          * thread from this job
1113          */
1114         if (o->gtod_cpu)
1115                 fio_cpu_clear(&o->cpumask, o->gtod_cpu);
1116
1117         /*
1118          * Set affinity first, in case it has an impact on the memory
1119          * allocations.
1120          */
1121         if (o->cpumask_set) {
1122                 ret = fio_setaffinity(td->pid, o->cpumask);
1123                 if (ret == -1) {
1124                         td_verror(td, errno, "cpu_set_affinity");
1125                         goto err;
1126                 }
1127         }
1128
1129 #ifdef CONFIG_LIBNUMA
1130         /* numa node setup */
1131         if (td->o.numa_cpumask_set || td->o.numa_memmask_set) {
1132                 int ret;
1133
1134                 if (numa_available() < 0) {
1135                         td_verror(td, errno, "Does not support NUMA API\n");
1136                         goto err;
1137                 }
1138
1139                 if (td->o.numa_cpumask_set) {
1140                         ret = numa_run_on_node_mask(td->o.numa_cpunodesmask);
1141                         if (ret == -1) {
1142                                 td_verror(td, errno, \
1143                                         "numa_run_on_node_mask failed\n");
1144                                 goto err;
1145                         }
1146                 }
1147
1148                 if (td->o.numa_memmask_set) {
1149
1150                         switch (td->o.numa_mem_mode) {
1151                         case MPOL_INTERLEAVE:
1152                                 numa_set_interleave_mask(td->o.numa_memnodesmask);
1153                                 break;
1154                         case MPOL_BIND:
1155                                 numa_set_membind(td->o.numa_memnodesmask);
1156                                 break;
1157                         case MPOL_LOCAL:
1158                                 numa_set_localalloc();
1159                                 break;
1160                         case MPOL_PREFERRED:
1161                                 numa_set_preferred(td->o.numa_mem_prefer_node);
1162                                 break;
1163                         case MPOL_DEFAULT:
1164                         default:
1165                                 break;
1166                         }
1167
1168                 }
1169         }
1170 #endif
1171
1172         /*
1173          * May alter parameters that init_io_u() will use, so we need to
1174          * do this first.
1175          */
1176         if (init_iolog(td))
1177                 goto err;
1178
1179         if (init_io_u(td))
1180                 goto err;
1181
1182         if (o->verify_async && verify_async_init(td))
1183                 goto err;
1184
1185         if (o->ioprio) {
1186                 ret = ioprio_set(IOPRIO_WHO_PROCESS, 0, o->ioprio_class, o->ioprio);
1187                 if (ret == -1) {
1188                         td_verror(td, errno, "ioprio_set");
1189                         goto err;
1190                 }
1191         }
1192
1193         if (td->o.cgroup && cgroup_setup(td, cgroup_list, &cgroup_mnt))
1194                 goto err;
1195
1196         errno = 0;
1197         if (nice(o->nice) == -1 && errno != 0) {
1198                 td_verror(td, errno, "nice");
1199                 goto err;
1200         }
1201
1202         if (o->ioscheduler && switch_ioscheduler(td))
1203                 goto err;
1204
1205         if (!o->create_serialize && setup_files(td))
1206                 goto err;
1207
1208         if (td_io_init(td))
1209                 goto err;
1210
1211         if (init_random_map(td))
1212                 goto err;
1213
1214         if (o->exec_prerun && exec_string(o->exec_prerun))
1215                 goto err;
1216
1217         if (o->pre_read) {
1218                 if (pre_read_files(td) < 0)
1219                         goto err;
1220         }
1221
1222         fio_verify_init(td);
1223
1224         fio_gettime(&td->epoch, NULL);
1225         fio_getrusage(&td->ru_start);
1226         clear_state = 0;
1227         while (keep_running(td)) {
1228                 uint64_t verify_bytes;
1229
1230                 fio_gettime(&td->start, NULL);
1231                 memcpy(&td->bw_sample_time, &td->start, sizeof(td->start));
1232                 memcpy(&td->iops_sample_time, &td->start, sizeof(td->start));
1233                 memcpy(&td->tv_cache, &td->start, sizeof(td->start));
1234
1235                 if (td->o.ratemin[DDIR_READ] || td->o.ratemin[DDIR_WRITE] ||
1236                                 td->o.ratemin[DDIR_TRIM]) {
1237                         memcpy(&td->lastrate[DDIR_READ], &td->bw_sample_time,
1238                                                 sizeof(td->bw_sample_time));
1239                         memcpy(&td->lastrate[DDIR_WRITE], &td->bw_sample_time,
1240                                                 sizeof(td->bw_sample_time));
1241                         memcpy(&td->lastrate[DDIR_TRIM], &td->bw_sample_time,
1242                                                 sizeof(td->bw_sample_time));
1243                 }
1244
1245                 if (clear_state)
1246                         clear_io_state(td);
1247
1248                 prune_io_piece_log(td);
1249
1250                 verify_bytes = do_io(td);
1251
1252                 clear_state = 1;
1253
1254                 if (td_read(td) && td->io_bytes[DDIR_READ]) {
1255                         elapsed = utime_since_now(&td->start);
1256                         td->ts.runtime[DDIR_READ] += elapsed;
1257                 }
1258                 if (td_write(td) && td->io_bytes[DDIR_WRITE]) {
1259                         elapsed = utime_since_now(&td->start);
1260                         td->ts.runtime[DDIR_WRITE] += elapsed;
1261                 }
1262                 if (td_trim(td) && td->io_bytes[DDIR_TRIM]) {
1263                         elapsed = utime_since_now(&td->start);
1264                         td->ts.runtime[DDIR_TRIM] += elapsed;
1265                 }
1266
1267                 if (td->error || td->terminate)
1268                         break;
1269
1270                 if (!td->o.do_verify ||
1271                     td->o.verify == VERIFY_NONE ||
1272                     (td->io_ops->flags & FIO_UNIDIR))
1273                         continue;
1274
1275                 clear_io_state(td);
1276
1277                 fio_gettime(&td->start, NULL);
1278
1279                 do_verify(td, verify_bytes);
1280
1281                 td->ts.runtime[DDIR_READ] += utime_since_now(&td->start);
1282
1283                 if (td->error || td->terminate)
1284                         break;
1285         }
1286
1287         update_rusage_stat(td);
1288         td->ts.runtime[DDIR_READ] = (td->ts.runtime[DDIR_READ] + 999) / 1000;
1289         td->ts.runtime[DDIR_WRITE] = (td->ts.runtime[DDIR_WRITE] + 999) / 1000;
1290         td->ts.runtime[DDIR_TRIM] = (td->ts.runtime[DDIR_TRIM] + 999) / 1000;
1291         td->ts.total_run_time = mtime_since_now(&td->epoch);
1292         td->ts.io_bytes[DDIR_READ] = td->io_bytes[DDIR_READ];
1293         td->ts.io_bytes[DDIR_WRITE] = td->io_bytes[DDIR_WRITE];
1294         td->ts.io_bytes[DDIR_TRIM] = td->io_bytes[DDIR_TRIM];
1295
1296         fio_unpin_memory(td);
1297
1298         fio_mutex_down(writeout_mutex);
1299         if (td->bw_log) {
1300                 if (td->o.bw_log_file) {
1301                         finish_log_named(td, td->bw_log,
1302                                                 td->o.bw_log_file, "bw");
1303                 } else
1304                         finish_log(td, td->bw_log, "bw");
1305         }
1306         if (td->lat_log) {
1307                 if (td->o.lat_log_file) {
1308                         finish_log_named(td, td->lat_log,
1309                                                 td->o.lat_log_file, "lat");
1310                 } else
1311                         finish_log(td, td->lat_log, "lat");
1312         }
1313         if (td->slat_log) {
1314                 if (td->o.lat_log_file) {
1315                         finish_log_named(td, td->slat_log,
1316                                                 td->o.lat_log_file, "slat");
1317                 } else
1318                         finish_log(td, td->slat_log, "slat");
1319         }
1320         if (td->clat_log) {
1321                 if (td->o.lat_log_file) {
1322                         finish_log_named(td, td->clat_log,
1323                                                 td->o.lat_log_file, "clat");
1324                 } else
1325                         finish_log(td, td->clat_log, "clat");
1326         }
1327         if (td->iops_log) {
1328                 if (td->o.iops_log_file) {
1329                         finish_log_named(td, td->iops_log,
1330                                                 td->o.iops_log_file, "iops");
1331                 } else
1332                         finish_log(td, td->iops_log, "iops");
1333         }
1334
1335         fio_mutex_up(writeout_mutex);
1336         if (td->o.exec_postrun)
1337                 exec_string(td->o.exec_postrun);
1338
1339         if (exitall_on_terminate)
1340                 fio_terminate_threads(td->groupid);
1341
1342 err:
1343         if (td->error)
1344                 log_info("fio: pid=%d, err=%d/%s\n", (int) td->pid, td->error,
1345                                                         td->verror);
1346
1347         if (td->o.verify_async)
1348                 verify_async_exit(td);
1349
1350         close_and_free_files(td);
1351         cleanup_io_u(td);
1352         close_ioengine(td);
1353         cgroup_shutdown(td, &cgroup_mnt);
1354
1355         if (o->cpumask_set) {
1356                 int ret = fio_cpuset_exit(&o->cpumask);
1357
1358                 td_verror(td, ret, "fio_cpuset_exit");
1359         }
1360
1361         /*
1362          * do this very late, it will log file closing as well
1363          */
1364         if (td->o.write_iolog_file)
1365                 write_iolog_close(td);
1366
1367         td_set_runstate(td, TD_EXITED);
1368         return (void *) (uintptr_t) td->error;
1369 }
1370
1371
1372 /*
1373  * We cannot pass the td data into a forked process, so attach the td and
1374  * pass it to the thread worker.
1375  */
1376 static int fork_main(int shmid, int offset)
1377 {
1378         struct thread_data *td;
1379         void *data, *ret;
1380
1381 #ifndef __hpux
1382         data = shmat(shmid, NULL, 0);
1383         if (data == (void *) -1) {
1384                 int __err = errno;
1385
1386                 perror("shmat");
1387                 return __err;
1388         }
1389 #else
1390         /*
1391          * HP-UX inherits shm mappings?
1392          */
1393         data = threads;
1394 #endif
1395
1396         td = data + offset * sizeof(struct thread_data);
1397         ret = thread_main(td);
1398         shmdt(data);
1399         return (int) (uintptr_t) ret;
1400 }
1401
1402 /*
1403  * Run over the job map and reap the threads that have exited, if any.
1404  */
1405 static void reap_threads(unsigned int *nr_running, unsigned int *t_rate,
1406                          unsigned int *m_rate)
1407 {
1408         struct thread_data *td;
1409         unsigned int cputhreads, realthreads, pending;
1410         int i, status, ret;
1411
1412         /*
1413          * reap exited threads (TD_EXITED -> TD_REAPED)
1414          */
1415         realthreads = pending = cputhreads = 0;
1416         for_each_td(td, i) {
1417                 int flags = 0;
1418
1419                 /*
1420                  * ->io_ops is NULL for a thread that has closed its
1421                  * io engine
1422                  */
1423                 if (td->io_ops && !strcmp(td->io_ops->name, "cpuio"))
1424                         cputhreads++;
1425                 else
1426                         realthreads++;
1427
1428                 if (!td->pid) {
1429                         pending++;
1430                         continue;
1431                 }
1432                 if (td->runstate == TD_REAPED)
1433                         continue;
1434                 if (td->o.use_thread) {
1435                         if (td->runstate == TD_EXITED) {
1436                                 td_set_runstate(td, TD_REAPED);
1437                                 goto reaped;
1438                         }
1439                         continue;
1440                 }
1441
1442                 flags = WNOHANG;
1443                 if (td->runstate == TD_EXITED)
1444                         flags = 0;
1445
1446                 /*
1447                  * check if someone quit or got killed in an unusual way
1448                  */
1449                 ret = waitpid(td->pid, &status, flags);
1450                 if (ret < 0) {
1451                         if (errno == ECHILD) {
1452                                 log_err("fio: pid=%d disappeared %d\n",
1453                                                 (int) td->pid, td->runstate);
1454                                 td->sig = ECHILD;
1455                                 td_set_runstate(td, TD_REAPED);
1456                                 goto reaped;
1457                         }
1458                         perror("waitpid");
1459                 } else if (ret == td->pid) {
1460                         if (WIFSIGNALED(status)) {
1461                                 int sig = WTERMSIG(status);
1462
1463                                 if (sig != SIGTERM && sig != SIGUSR2)
1464                                         log_err("fio: pid=%d, got signal=%d\n",
1465                                                         (int) td->pid, sig);
1466                                 td->sig = sig;
1467                                 td_set_runstate(td, TD_REAPED);
1468                                 goto reaped;
1469                         }
1470                         if (WIFEXITED(status)) {
1471                                 if (WEXITSTATUS(status) && !td->error)
1472                                         td->error = WEXITSTATUS(status);
1473
1474                                 td_set_runstate(td, TD_REAPED);
1475                                 goto reaped;
1476                         }
1477                 }
1478
1479                 /*
1480                  * thread is not dead, continue
1481                  */
1482                 pending++;
1483                 continue;
1484 reaped:
1485                 (*nr_running)--;
1486                 (*m_rate) -= ddir_rw_sum(td->o.ratemin);
1487                 (*t_rate) -= ddir_rw_sum(td->o.rate);
1488                 if (!td->pid)
1489                         pending--;
1490
1491                 if (td->error)
1492                         exit_value++;
1493
1494                 done_secs += mtime_since_now(&td->epoch) / 1000;
1495         }
1496
1497         if (*nr_running == cputhreads && !pending && realthreads)
1498                 fio_terminate_threads(TERMINATE_ALL);
1499 }
1500
1501 /*
1502  * Main function for kicking off and reaping jobs, as needed.
1503  */
1504 static void run_threads(void)
1505 {
1506         struct thread_data *td;
1507         unsigned long spent;
1508         unsigned int i, todo, nr_running, m_rate, t_rate, nr_started;
1509
1510         if (fio_gtod_offload && fio_start_gtod_thread())
1511                 return;
1512         
1513         fio_idle_prof_init();
1514
1515         set_sig_handlers();
1516
1517         nr_thread = nr_process = 0;
1518         for_each_td(td, i) {
1519                 if (td->o.use_thread)
1520                         nr_thread++;
1521                 else
1522                         nr_process++;
1523         }
1524
1525         if (output_format == FIO_OUTPUT_NORMAL) {
1526                 log_info("Starting ");
1527                 if (nr_thread)
1528                         log_info("%d thread%s", nr_thread,
1529                                                 nr_thread > 1 ? "s" : "");
1530                 if (nr_process) {
1531                         if (nr_thread)
1532                                 log_info(" and ");
1533                         log_info("%d process%s", nr_process,
1534                                                 nr_process > 1 ? "es" : "");
1535                 }
1536                 log_info("\n");
1537                 fflush(stdout);
1538         }
1539
1540         todo = thread_number;
1541         nr_running = 0;
1542         nr_started = 0;
1543         m_rate = t_rate = 0;
1544
1545         for_each_td(td, i) {
1546                 print_status_init(td->thread_number - 1);
1547
1548                 if (!td->o.create_serialize)
1549                         continue;
1550
1551                 /*
1552                  * do file setup here so it happens sequentially,
1553                  * we don't want X number of threads getting their
1554                  * client data interspersed on disk
1555                  */
1556                 if (setup_files(td)) {
1557                         exit_value++;
1558                         if (td->error)
1559                                 log_err("fio: pid=%d, err=%d/%s\n",
1560                                         (int) td->pid, td->error, td->verror);
1561                         td_set_runstate(td, TD_REAPED);
1562                         todo--;
1563                 } else {
1564                         struct fio_file *f;
1565                         unsigned int j;
1566
1567                         /*
1568                          * for sharing to work, each job must always open
1569                          * its own files. so close them, if we opened them
1570                          * for creation
1571                          */
1572                         for_each_file(td, f, j) {
1573                                 if (fio_file_open(f))
1574                                         td_io_close_file(td, f);
1575                         }
1576                 }
1577         }
1578
1579         /* start idle threads before io threads start to run */
1580         fio_idle_prof_start();
1581
1582         set_genesis_time();
1583
1584         while (todo) {
1585                 struct thread_data *map[REAL_MAX_JOBS];
1586                 struct timeval this_start;
1587                 int this_jobs = 0, left;
1588
1589                 /*
1590                  * create threads (TD_NOT_CREATED -> TD_CREATED)
1591                  */
1592                 for_each_td(td, i) {
1593                         if (td->runstate != TD_NOT_CREATED)
1594                                 continue;
1595
1596                         /*
1597                          * never got a chance to start, killed by other
1598                          * thread for some reason
1599                          */
1600                         if (td->terminate) {
1601                                 todo--;
1602                                 continue;
1603                         }
1604
1605                         if (td->o.start_delay) {
1606                                 spent = mtime_since_genesis();
1607
1608                                 if (td->o.start_delay * 1000 > spent)
1609                                         continue;
1610                         }
1611
1612                         if (td->o.stonewall && (nr_started || nr_running)) {
1613                                 dprint(FD_PROCESS, "%s: stonewall wait\n",
1614                                                         td->o.name);
1615                                 break;
1616                         }
1617
1618                         init_disk_util(td);
1619
1620                         /*
1621                          * Set state to created. Thread will transition
1622                          * to TD_INITIALIZED when it's done setting up.
1623                          */
1624                         td_set_runstate(td, TD_CREATED);
1625                         map[this_jobs++] = td;
1626                         nr_started++;
1627
1628                         if (td->o.use_thread) {
1629                                 int ret;
1630
1631                                 dprint(FD_PROCESS, "will pthread_create\n");
1632                                 ret = pthread_create(&td->thread, NULL,
1633                                                         thread_main, td);
1634                                 if (ret) {
1635                                         log_err("pthread_create: %s\n",
1636                                                         strerror(ret));
1637                                         nr_started--;
1638                                         break;
1639                                 }
1640                                 ret = pthread_detach(td->thread);
1641                                 if (ret)
1642                                         log_err("pthread_detach: %s",
1643                                                         strerror(ret));
1644                         } else {
1645                                 pid_t pid;
1646                                 dprint(FD_PROCESS, "will fork\n");
1647                                 pid = fork();
1648                                 if (!pid) {
1649                                         int ret = fork_main(shm_id, i);
1650
1651                                         _exit(ret);
1652                                 } else if (i == fio_debug_jobno)
1653                                         *fio_debug_jobp = pid;
1654                         }
1655                         dprint(FD_MUTEX, "wait on startup_mutex\n");
1656                         if (fio_mutex_down_timeout(startup_mutex, 10)) {
1657                                 log_err("fio: job startup hung? exiting.\n");
1658                                 fio_terminate_threads(TERMINATE_ALL);
1659                                 fio_abort = 1;
1660                                 nr_started--;
1661                                 break;
1662                         }
1663                         dprint(FD_MUTEX, "done waiting on startup_mutex\n");
1664                 }
1665
1666                 /*
1667                  * Wait for the started threads to transition to
1668                  * TD_INITIALIZED.
1669                  */
1670                 fio_gettime(&this_start, NULL);
1671                 left = this_jobs;
1672                 while (left && !fio_abort) {
1673                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
1674                                 break;
1675
1676                         usleep(100000);
1677
1678                         for (i = 0; i < this_jobs; i++) {
1679                                 td = map[i];
1680                                 if (!td)
1681                                         continue;
1682                                 if (td->runstate == TD_INITIALIZED) {
1683                                         map[i] = NULL;
1684                                         left--;
1685                                 } else if (td->runstate >= TD_EXITED) {
1686                                         map[i] = NULL;
1687                                         left--;
1688                                         todo--;
1689                                         nr_running++; /* work-around... */
1690                                 }
1691                         }
1692                 }
1693
1694                 if (left) {
1695                         log_err("fio: %d job%s failed to start\n", left,
1696                                         left > 1 ? "s" : "");
1697                         for (i = 0; i < this_jobs; i++) {
1698                                 td = map[i];
1699                                 if (!td)
1700                                         continue;
1701                                 kill(td->pid, SIGTERM);
1702                         }
1703                         break;
1704                 }
1705
1706                 /*
1707                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
1708                  */
1709                 for_each_td(td, i) {
1710                         if (td->runstate != TD_INITIALIZED)
1711                                 continue;
1712
1713                         if (in_ramp_time(td))
1714                                 td_set_runstate(td, TD_RAMP);
1715                         else
1716                                 td_set_runstate(td, TD_RUNNING);
1717                         nr_running++;
1718                         nr_started--;
1719                         m_rate += ddir_rw_sum(td->o.ratemin);
1720                         t_rate += ddir_rw_sum(td->o.rate);
1721                         todo--;
1722                         fio_mutex_up(td->mutex);
1723                 }
1724
1725                 reap_threads(&nr_running, &t_rate, &m_rate);
1726
1727                 if (todo)
1728                         usleep(100000);
1729         }
1730
1731         while (nr_running) {
1732                 reap_threads(&nr_running, &t_rate, &m_rate);
1733                 usleep(10000);
1734         }
1735
1736         fio_idle_prof_stop();
1737
1738         update_io_ticks();
1739 }
1740
1741 void wait_for_disk_thread_exit(void)
1742 {
1743         fio_mutex_down(disk_thread_mutex);
1744 }
1745
1746 static void free_disk_util(void)
1747 {
1748         disk_util_start_exit();
1749         wait_for_disk_thread_exit();
1750         disk_util_prune_entries();
1751 }
1752
1753 static void *disk_thread_main(void *data)
1754 {
1755         int ret = 0;
1756
1757         fio_mutex_up(startup_mutex);
1758
1759         while (threads && !ret) {
1760                 usleep(DISK_UTIL_MSEC * 1000);
1761                 if (!threads)
1762                         break;
1763                 ret = update_io_ticks();
1764
1765                 if (!is_backend)
1766                         print_thread_status();
1767         }
1768
1769         fio_mutex_up(disk_thread_mutex);
1770         return NULL;
1771 }
1772
1773 static int create_disk_util_thread(void)
1774 {
1775         int ret;
1776
1777         setup_disk_util();
1778
1779         disk_thread_mutex = fio_mutex_init(FIO_MUTEX_LOCKED);
1780
1781         ret = pthread_create(&disk_util_thread, NULL, disk_thread_main, NULL);
1782         if (ret) {
1783                 fio_mutex_remove(disk_thread_mutex);
1784                 log_err("Can't create disk util thread: %s\n", strerror(ret));
1785                 return 1;
1786         }
1787
1788         ret = pthread_detach(disk_util_thread);
1789         if (ret) {
1790                 fio_mutex_remove(disk_thread_mutex);
1791                 log_err("Can't detatch disk util thread: %s\n", strerror(ret));
1792                 return 1;
1793         }
1794
1795         dprint(FD_MUTEX, "wait on startup_mutex\n");
1796         fio_mutex_down(startup_mutex);
1797         dprint(FD_MUTEX, "done waiting on startup_mutex\n");
1798         return 0;
1799 }
1800
1801 int fio_backend(void)
1802 {
1803         struct thread_data *td;
1804         int i;
1805
1806         if (exec_profile) {
1807                 if (load_profile(exec_profile))
1808                         return 1;
1809                 free(exec_profile);
1810                 exec_profile = NULL;
1811         }
1812         if (!thread_number)
1813                 return 0;
1814
1815         if (write_bw_log) {
1816                 setup_log(&agg_io_log[DDIR_READ], 0, IO_LOG_TYPE_BW);
1817                 setup_log(&agg_io_log[DDIR_WRITE], 0, IO_LOG_TYPE_BW);
1818                 setup_log(&agg_io_log[DDIR_TRIM], 0, IO_LOG_TYPE_BW);
1819         }
1820
1821         startup_mutex = fio_mutex_init(FIO_MUTEX_LOCKED);
1822         if (startup_mutex == NULL)
1823                 return 1;
1824         writeout_mutex = fio_mutex_init(FIO_MUTEX_UNLOCKED);
1825         if (writeout_mutex == NULL)
1826                 return 1;
1827
1828         set_genesis_time();
1829         create_disk_util_thread();
1830
1831         cgroup_list = smalloc(sizeof(*cgroup_list));
1832         INIT_FLIST_HEAD(cgroup_list);
1833
1834         run_threads();
1835
1836         if (!fio_abort) {
1837                 show_run_stats();
1838                 if (write_bw_log) {
1839                         __finish_log(agg_io_log[DDIR_READ], "agg-read_bw.log");
1840                         __finish_log(agg_io_log[DDIR_WRITE],
1841                                         "agg-write_bw.log");
1842                         __finish_log(agg_io_log[DDIR_TRIM],
1843                                         "agg-write_bw.log");
1844                 }
1845         }
1846
1847         for_each_td(td, i)
1848                 fio_options_free(td);
1849
1850         free_disk_util();
1851         cgroup_kill(cgroup_list);
1852         sfree(cgroup_list);
1853         sfree(cgroup_mnt);
1854
1855         fio_mutex_remove(startup_mutex);
1856         fio_mutex_remove(writeout_mutex);
1857         fio_mutex_remove(disk_thread_mutex);
1858         return exit_value;
1859 }