rate-submit.c

   1 /*
   2  * Rated submission helpers
   3  *
   4  * Copyright (C) 2015 Jens Axboe <axboe@kernel.dk>
   5  *
   6  */
   7 #include "fio.h"
   8 #include "ioengines.h"
   9 #include "lib/getrusage.h"
  10 #include "rate-submit.h"
  11
  12 static void check_overlap(struct io_u *io_u)
  13 {
  14         int i;
  15         struct thread_data *td;
  16         bool overlap = false;
  17
  18         do {
  19                 /*
  20                  * Allow only one thread to check for overlap at a
  21                  * time to prevent two threads from thinking the coast
  22                  * is clear and then submitting IOs that overlap with
  23                  * each other
  24                  *
  25                  * If an overlap is found, release the lock and
  26                  * re-acquire it before checking again to give other
  27                  * threads a chance to make progress
  28                  *
  29                  * If an overlap is not found, release the lock when the
  30                  * io_u's IO_U_F_FLIGHT flag is set so that this io_u
  31                  * can be checked by other threads as they assess overlap
  32                  */
  33                 pthread_mutex_lock(&overlap_check);
  34                 for_each_td(td, i) {
  35                         if (td->runstate <= TD_SETTING_UP ||
  36                                 td->runstate >= TD_FINISHING ||
  37                                 !td->o.serialize_overlap ||
  38                                 td->o.io_submit_mode != IO_MODE_OFFLOAD)
  39                                 continue;
  40
  41                         overlap = in_flight_overlap(&td->io_u_all, io_u);
  42                         if (overlap) {
  43                                 pthread_mutex_unlock(&overlap_check);
  44                                 break;
  45                         }
  46                 }
  47         } while (overlap);
  48 }
  49
  50 static int io_workqueue_fn(struct submit_worker *sw,
  51                            struct workqueue_work *work)
  52 {
  53         struct io_u *io_u = container_of(work, struct io_u, work);
  54         const enum fio_ddir ddir = io_u->ddir;
  55         struct thread_data *td = sw->priv;
  56         int ret, error;
  57
  58         if (td->o.serialize_overlap)
  59                 check_overlap(io_u);
  60
  61         dprint(FD_RATE, "io_u %p queued by %u\n", io_u, gettid());
  62
  63         io_u_set(td, io_u, IO_U_F_NO_FILE_PUT);
  64
  65         td->cur_depth++;
  66
  67         do {
  68                 ret = td_io_queue(td, io_u);
  69                 if (ret != FIO_Q_BUSY)
  70                         break;
  71                 ret = io_u_queued_complete(td, 1);
  72                 if (ret > 0)
  73                         td->cur_depth -= ret;
  74                 else if (ret < 0)
  75                         break;
  76                 io_u_clear(td, io_u, IO_U_F_FLIGHT);
  77         } while (1);
  78
  79         dprint(FD_RATE, "io_u %p ret %d by %u\n", io_u, ret, gettid());
  80
  81         error = io_queue_event(td, io_u, &ret, ddir, NULL, 0, NULL);
  82
  83         if (ret == FIO_Q_COMPLETED)
  84                 td->cur_depth--;
  85         else if (ret == FIO_Q_QUEUED) {
  86                 unsigned int min_evts;
  87
  88                 if (td->o.iodepth == 1)
  89                         min_evts = 1;
  90                 else
  91                         min_evts = 0;
  92
  93                 ret = io_u_queued_complete(td, min_evts);
  94                 if (ret > 0)
  95                         td->cur_depth -= ret;
  96         }
  97
  98         if (error || td->error)
  99                 pthread_cond_signal(&td->parent->free_cond);
 100
 101         return 0;
 102 }
 103
 104 static bool io_workqueue_pre_sleep_flush_fn(struct submit_worker *sw)
 105 {
 106         struct thread_data *td = sw->priv;
 107
 108         if (td->error)
 109                 return false;
 110         if (td->io_u_queued || td->cur_depth || td->io_u_in_flight)
 111                 return true;
 112
 113         return false;
 114 }
 115
 116 static void io_workqueue_pre_sleep_fn(struct submit_worker *sw)
 117 {
 118         struct thread_data *td = sw->priv;
 119         int ret;
 120
 121         ret = io_u_quiesce(td);
 122         if (ret > 0)
 123                 td->cur_depth -= ret;
 124 }
 125
 126 static int io_workqueue_alloc_fn(struct submit_worker *sw)
 127 {
 128         struct thread_data *td;
 129
 130         td = calloc(1, sizeof(*td));
 131         sw->priv = td;
 132         return 0;
 133 }
 134
 135 static void io_workqueue_free_fn(struct submit_worker *sw)
 136 {
 137         free(sw->priv);
 138         sw->priv = NULL;
 139 }
 140
 141 static int io_workqueue_init_worker_fn(struct submit_worker *sw)
 142 {
 143         struct thread_data *parent = sw->wq->td;
 144         struct thread_data *td = sw->priv;
 145
 146         memcpy(&td->o, &parent->o, sizeof(td->o));
 147         memcpy(&td->ts, &parent->ts, sizeof(td->ts));
 148         td->o.uid = td->o.gid = -1U;
 149         dup_files(td, parent);
 150         td->eo = parent->eo;
 151         fio_options_mem_dupe(td);
 152
 153         if (ioengine_load(td))
 154                 goto err;
 155
 156         td->pid = gettid();
 157
 158         INIT_FLIST_HEAD(&td->io_log_list);
 159         INIT_FLIST_HEAD(&td->io_hist_list);
 160         INIT_FLIST_HEAD(&td->verify_list);
 161         INIT_FLIST_HEAD(&td->trim_list);
 162         td->io_hist_tree = RB_ROOT;
 163
 164         td->o.iodepth = 1;
 165         if (td_io_init(td))
 166                 goto err_io_init;
 167
 168         set_epoch_time(td, td->o.log_unix_epoch);
 169         fio_getrusage(&td->ru_start);
 170         clear_io_state(td, 1);
 171
 172         td_set_runstate(td, TD_RUNNING);
 173         td->flags |= TD_F_CHILD | TD_F_NEED_LOCK;
 174         td->parent = parent;
 175         return 0;
 176
 177 err_io_init:
 178         close_ioengine(td);
 179 err:
 180         return 1;
 181
 182 }
 183
 184 static void io_workqueue_exit_worker_fn(struct submit_worker *sw,
 185                                         unsigned int *sum_cnt)
 186 {
 187         struct thread_data *td = sw->priv;
 188
 189         (*sum_cnt)++;
 190         sum_thread_stats(&sw->wq->td->ts, &td->ts, *sum_cnt == 1);
 191
 192         fio_options_free(td);
 193         close_and_free_files(td);
 194         if (td->io_ops)
 195                 close_ioengine(td);
 196         td_set_runstate(td, TD_EXITED);
 197 }
 198
 199 #ifdef CONFIG_SFAA
 200 static void sum_val(uint64_t *dst, uint64_t *src)
 201 {
 202         if (*src) {
 203                 __sync_fetch_and_add(dst, *src);
 204                 *src = 0;
 205         }
 206 }
 207 #else
 208 static void sum_val(uint64_t *dst, uint64_t *src)
 209 {
 210         if (*src) {
 211                 *dst += *src;
 212                 *src = 0;
 213         }
 214 }
 215 #endif
 216
 217 static void pthread_double_unlock(pthread_mutex_t *lock1,
 218                                   pthread_mutex_t *lock2)
 219 {
 220 #ifndef CONFIG_SFAA
 221         pthread_mutex_unlock(lock1);
 222         pthread_mutex_unlock(lock2);
 223 #endif
 224 }
 225
 226 static void pthread_double_lock(pthread_mutex_t *lock1, pthread_mutex_t *lock2)
 227 {
 228 #ifndef CONFIG_SFAA
 229         if (lock1 < lock2) {
 230                 pthread_mutex_lock(lock1);
 231                 pthread_mutex_lock(lock2);
 232         } else {
 233                 pthread_mutex_lock(lock2);
 234                 pthread_mutex_lock(lock1);
 235         }
 236 #endif
 237 }
 238
 239 static void sum_ddir(struct thread_data *dst, struct thread_data *src,
 240                      enum fio_ddir ddir)
 241 {
 242         pthread_double_lock(&dst->io_wq.stat_lock, &src->io_wq.stat_lock);
 243
 244         sum_val(&dst->io_bytes[ddir], &src->io_bytes[ddir]);
 245         sum_val(&dst->io_blocks[ddir], &src->io_blocks[ddir]);
 246         sum_val(&dst->this_io_blocks[ddir], &src->this_io_blocks[ddir]);
 247         sum_val(&dst->this_io_bytes[ddir], &src->this_io_bytes[ddir]);
 248         sum_val(&dst->bytes_done[ddir], &src->bytes_done[ddir]);
 249
 250         pthread_double_unlock(&dst->io_wq.stat_lock, &src->io_wq.stat_lock);
 251 }
 252
 253 static void io_workqueue_update_acct_fn(struct submit_worker *sw)
 254 {
 255         struct thread_data *src = sw->priv;
 256         struct thread_data *dst = sw->wq->td;
 257
 258         if (td_read(src))
 259                 sum_ddir(dst, src, DDIR_READ);
 260         if (td_write(src))
 261                 sum_ddir(dst, src, DDIR_WRITE);
 262         if (td_trim(src))
 263                 sum_ddir(dst, src, DDIR_TRIM);
 264
 265 }
 266
 267 static struct workqueue_ops rated_wq_ops = {
 268         .fn                     = io_workqueue_fn,
 269         .pre_sleep_flush_fn     = io_workqueue_pre_sleep_flush_fn,
 270         .pre_sleep_fn           = io_workqueue_pre_sleep_fn,
 271         .update_acct_fn         = io_workqueue_update_acct_fn,
 272         .alloc_worker_fn        = io_workqueue_alloc_fn,
 273         .free_worker_fn         = io_workqueue_free_fn,
 274         .init_worker_fn         = io_workqueue_init_worker_fn,
 275         .exit_worker_fn         = io_workqueue_exit_worker_fn,
 276 };
 277
 278 int rate_submit_init(struct thread_data *td, struct sk_out *sk_out)
 279 {
 280         if (td->o.io_submit_mode != IO_MODE_OFFLOAD)
 281                 return 0;
 282
 283         return workqueue_init(td, &td->io_wq, &rated_wq_ops, td->o.iodepth, sk_out);
 284 }
 285
 286 void rate_submit_exit(struct thread_data *td)
 287 {
 288         if (td->o.io_submit_mode != IO_MODE_OFFLOAD)
 289                 return;
 290
 291         workqueue_exit(&td->io_wq);
 292 }