steadystate: rename TODO to STEADYSTATE-TODO
[fio.git] / libfio.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
25 #include <string.h>
26 #include <sys/types.h>
27 #include <signal.h>
28 #include <stdint.h>
29 #include <locale.h>
30 #include <fcntl.h>
31
32 #include "fio.h"
33 #include "smalloc.h"
34 #include "os/os.h"
35 #include "filelock.h"
36 #include "helper_thread.h"
37
38 /*
39  * Just expose an empty list, if the OS does not support disk util stats
40  */
41 #ifndef FIO_HAVE_DISK_UTIL
42 FLIST_HEAD(disk_list);
43 #endif
44
45 unsigned long arch_flags = 0;
46
47 uintptr_t page_mask = 0;
48 uintptr_t page_size = 0;
49
50 /* see os/os.h */
51 static const char *fio_os_strings[os_nr] = {
52         "Invalid",
53         "Linux",
54         "AIX",
55         "FreeBSD",
56         "HP-UX",
57         "OSX",
58         "NetBSD",
59         "OpenBSD",
60         "Solaris",
61         "Windows",
62         "Android",
63         "DragonFly",
64 };
65
66 /* see arch/arch.h */
67 static const char *fio_arch_strings[arch_nr] = {
68         "Invalid",
69         "x86-64",
70         "x86",
71         "ppc",
72         "ia64",
73         "s390",
74         "alpha",
75         "sparc",
76         "sparc64",
77         "arm",
78         "sh",
79         "hppa",
80         "mips",
81         "aarch64",
82         "generic"
83 };
84
85 static void reset_io_counters(struct thread_data *td, int all)
86 {
87         int ddir;
88
89         if (all) {
90                 for (ddir = 0; ddir < DDIR_RWDIR_CNT; ddir++) {
91                         td->stat_io_bytes[ddir] = 0;
92                         td->this_io_bytes[ddir] = 0;
93                         td->stat_io_blocks[ddir] = 0;
94                         td->this_io_blocks[ddir] = 0;
95                         td->rate_bytes[ddir] = 0;
96                         td->rate_blocks[ddir] = 0;
97                         td->bytes_done[ddir] = 0;
98                         td->rate_io_issue_bytes[ddir] = 0;
99                         td->rate_next_io_time[ddir] = 0;
100                 }
101         }
102
103         td->zone_bytes = 0;
104
105         td->last_was_sync = 0;
106         td->rwmix_issues = 0;
107
108         /*
109          * reset file done count if we are to start over
110          */
111         if (td->o.time_based || td->o.loops || td->o.do_verify)
112                 td->nr_done_files = 0;
113 }
114
115 void clear_io_state(struct thread_data *td, int all)
116 {
117         struct fio_file *f;
118         unsigned int i;
119
120         reset_io_counters(td, all);
121
122         close_files(td);
123         for_each_file(td, f, i) {
124                 fio_file_clear_done(f);
125                 f->file_offset = get_start_offset(td, f);
126         }
127
128         /*
129          * Re-Seed random number generator if rand_repeatable is true
130          */
131         if (td->o.rand_repeatable)
132                 td_fill_rand_seeds(td);
133 }
134
135 void reset_all_stats(struct thread_data *td)
136 {
137         struct timeval tv;
138         int i;
139
140         reset_io_counters(td, 1);
141
142         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
143                 td->io_bytes[i] = 0;
144                 td->io_blocks[i] = 0;
145                 td->io_issues[i] = 0;
146                 td->ts.total_io_u[i] = 0;
147                 td->ts.runtime[i] = 0;
148                 td->rwmix_issues = 0;
149         }
150
151         fio_gettime(&tv, NULL);
152         memcpy(&td->epoch, &tv, sizeof(tv));
153         memcpy(&td->start, &tv, sizeof(tv));
154         memcpy(&td->iops_sample_time, &tv, sizeof(tv));
155         memcpy(&td->bw_sample_time, &tv, sizeof(tv));
156         memcpy(&td->ss.prev_time, &tv, sizeof(tv));
157
158         lat_target_reset(td);
159         clear_rusage_stat(td);
160         helper_reset();
161 }
162
163 void reset_fio_state(void)
164 {
165         groupid = 0;
166         thread_number = 0;
167         stat_number = 0;
168         done_secs = 0;
169 }
170
171 const char *fio_get_os_string(int nr)
172 {
173         if (nr < os_nr)
174                 return fio_os_strings[nr];
175
176         return NULL;
177 }
178
179 const char *fio_get_arch_string(int nr)
180 {
181         if (nr < arch_nr)
182                 return fio_arch_strings[nr];
183
184         return NULL;
185 }
186
187 static const char *td_runstates[] = {
188         "NOT_CREATED",
189         "CREATED",
190         "INITIALIZED",
191         "RAMP",
192         "SETTING_UP",
193         "RUNNING",
194         "PRE_READING",
195         "VERIFYING",
196         "FSYNCING",
197         "FINISHING",
198         "EXITED",
199         "REAPED",
200 };
201
202 const char *runstate_to_name(int runstate)
203 {
204         compiletime_assert(TD_LAST == 12, "td runstate list");
205         if (runstate >= 0 && runstate < TD_LAST)
206                 return td_runstates[runstate];
207
208         return "invalid";
209 }
210
211 void td_set_runstate(struct thread_data *td, int runstate)
212 {
213         if (td->runstate == runstate)
214                 return;
215
216         dprint(FD_PROCESS, "pid=%d: runstate %s -> %s\n", (int) td->pid,
217                                                 runstate_to_name(td->runstate),
218                                                 runstate_to_name(runstate));
219         td->runstate = runstate;
220 }
221
222 int td_bump_runstate(struct thread_data *td, int new_state)
223 {
224         int old_state = td->runstate;
225
226         td_set_runstate(td, new_state);
227         return old_state;
228 }
229
230 void td_restore_runstate(struct thread_data *td, int old_state)
231 {
232         td_set_runstate(td, old_state);
233 }
234
235 void fio_mark_td_terminate(struct thread_data *td)
236 {
237         fio_gettime(&td->terminate_time, NULL);
238         write_barrier();
239         td->terminate = 1;
240 }
241
242 void fio_terminate_threads(unsigned int group_id)
243 {
244         struct thread_data *td;
245         pid_t pid = getpid();
246         int i;
247
248         dprint(FD_PROCESS, "terminate group_id=%d\n", group_id);
249
250         for_each_td(td, i) {
251                 if (group_id == TERMINATE_ALL || group_id == td->groupid) {
252                         dprint(FD_PROCESS, "setting terminate on %s/%d\n",
253                                                 td->o.name, (int) td->pid);
254
255                         if (td->terminate)
256                                 continue;
257
258                         fio_mark_td_terminate(td);
259                         td->o.start_delay = 0;
260
261                         /*
262                          * if the thread is running, just let it exit
263                          */
264                         if (!td->pid || pid == td->pid)
265                                 continue;
266                         else if (td->runstate < TD_RAMP)
267                                 kill(td->pid, SIGTERM);
268                         else {
269                                 struct ioengine_ops *ops = td->io_ops;
270
271                                 if (ops && ops->terminate)
272                                         ops->terminate(td);
273                         }
274                 }
275         }
276 }
277
278 int fio_running_or_pending_io_threads(void)
279 {
280         struct thread_data *td;
281         int i;
282         int nr_io_threads = 0;
283
284         for_each_td(td, i) {
285                 if (td->flags & TD_F_NOIO)
286                         continue;
287                 nr_io_threads++;
288                 if (td->runstate < TD_EXITED)
289                         return 1;
290         }
291
292         if (!nr_io_threads)
293                 return -1; /* we only had cpuio threads to begin with */
294         return 0;
295 }
296
297 int fio_set_fd_nonblocking(int fd, const char *who)
298 {
299         int flags;
300
301         flags = fcntl(fd, F_GETFL);
302         if (flags < 0)
303                 log_err("fio: %s failed to get file flags: %s\n", who, strerror(errno));
304         else {
305                 int new_flags = flags | O_NONBLOCK;
306
307                 new_flags = fcntl(fd, F_SETFL, new_flags);
308                 if (new_flags < 0)
309                         log_err("fio: %s failed to get file flags: %s\n", who, strerror(errno));
310         }
311
312         return flags;
313 }
314
315 static int endian_check(void)
316 {
317         union {
318                 uint8_t c[8];
319                 uint64_t v;
320         } u;
321         int le = 0, be = 0;
322
323         u.v = 0x12;
324         if (u.c[7] == 0x12)
325                 be = 1;
326         else if (u.c[0] == 0x12)
327                 le = 1;
328
329 #if defined(CONFIG_LITTLE_ENDIAN)
330         if (be)
331                 return 1;
332 #elif defined(CONFIG_BIG_ENDIAN)
333         if (le)
334                 return 1;
335 #else
336         return 1;
337 #endif
338
339         if (!le && !be)
340                 return 1;
341
342         return 0;
343 }
344
345 int initialize_fio(char *envp[])
346 {
347         long ps;
348
349         /*
350          * We need these to be properly 64-bit aligned, otherwise we
351          * can run into problems on archs that fault on unaligned fp
352          * access (ARM).
353          */
354         compiletime_assert((offsetof(struct thread_stat, percentile_list) % 8) == 0, "stat percentile_list");
355         compiletime_assert((offsetof(struct thread_stat, total_run_time) % 8) == 0, "total_run_time");
356         compiletime_assert((offsetof(struct thread_stat, total_err_count) % 8) == 0, "total_err_count");
357         compiletime_assert((offsetof(struct thread_stat, latency_percentile) % 8) == 0, "stat latency_percentile");
358         compiletime_assert((offsetof(struct thread_options_pack, zipf_theta) % 8) == 0, "zipf_theta");
359         compiletime_assert((offsetof(struct thread_options_pack, pareto_h) % 8) == 0, "pareto_h");
360         compiletime_assert((offsetof(struct thread_options_pack, percentile_list) % 8) == 0, "percentile_list");
361         compiletime_assert((offsetof(struct thread_options_pack, latency_percentile) % 8) == 0, "latency_percentile");
362
363         if (endian_check()) {
364                 log_err("fio: endianness settings appear wrong.\n");
365                 log_err("fio: please report this to fio@vger.kernel.org\n");
366                 return 1;
367         }
368
369 #if !defined(CONFIG_GETTIMEOFDAY) && !defined(CONFIG_CLOCK_GETTIME)
370 #error "No available clock source!"
371 #endif
372
373         arch_init(envp);
374
375         sinit();
376
377         if (fio_filelock_init()) {
378                 log_err("fio: failed initializing filelock subsys\n");
379                 return 1;
380         }
381
382         /*
383          * We need locale for number printing, if it isn't set then just
384          * go with the US format.
385          */
386         if (!getenv("LC_NUMERIC"))
387                 setlocale(LC_NUMERIC, "en_US");
388
389         ps = sysconf(_SC_PAGESIZE);
390         if (ps < 0) {
391                 log_err("Failed to get page size\n");
392                 return 1;
393         }
394
395         page_size = ps;
396         page_mask = ps - 1;
397
398         fio_keywords_init();
399         return 0;
400 }
401
402 void deinitialize_fio(void)
403 {
404         fio_keywords_exit();
405 }