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
  17         /*
  18          * Allow only one thread to check for overlap at a time to prevent two
  19          * threads from thinking the coast is clear and then submitting IOs
  20          * that overlap with each other.
  21          *
  22          * If an overlap is found, release the lock and re-acquire it before
  23          * checking again to give other threads a chance to make progress.
  24          *
  25          * If no overlap is found, release the lock when the io_u's
  26          * IO_U_F_FLIGHT flag is set so that this io_u can be checked by other
  27          * threads as they assess overlap.
  28          */
  29         pthread_mutex_lock(&overlap_check);
  30
  31 retry:
  32         for_each_td(td, i) {
  33                 if (td->runstate <= TD_SETTING_UP ||
  34                     td->runstate >= TD_FINISHING ||
  35                     !td->o.serialize_overlap ||
  36                     td->o.io_submit_mode != IO_MODE_OFFLOAD)
  37                         continue;
  38
  39                 if (!in_flight_overlap(&td->io_u_all, io_u))
  40                         continue;
  41
  42                 pthread_mutex_unlock(&overlap_check);
  43                 pthread_mutex_lock(&overlap_check);
  44                 goto retry;
  45         }
  46 }
  47
  48 static int io_workqueue_fn(struct submit_worker *sw,
  49                            struct workqueue_work *work)
  50 {
  51         struct io_u *io_u = container_of(work, struct io_u, work);
  52         const enum fio_ddir ddir = io_u->ddir;
  53         struct thread_data *td = sw->priv;
  54         int ret, error;
  55
  56         if (td->o.serialize_overlap)
  57                 check_overlap(io_u);
  58
  59         dprint(FD_RATE, "io_u %p queued by %u\n", io_u, gettid());
  60
  61         io_u_set(td, io_u, IO_U_F_NO_FILE_PUT);
  62
  63         td->cur_depth++;
  64
  65         do {
  66                 ret = td_io_queue(td, io_u);
  67                 if (ret != FIO_Q_BUSY)
  68                         break;
  69                 ret = io_u_queued_complete(td, 1);
  70                 if (ret > 0)
  71                         td->cur_depth -= ret;
  72                 else if (ret < 0)
  73                         break;
  74                 io_u_clear(td, io_u, IO_U_F_FLIGHT);
  75         } while (1);
  76
  77         dprint(FD_RATE, "io_u %p ret %d by %u\n", io_u, ret, gettid());
  78
  79         error = io_queue_event(td, io_u, &ret, ddir, NULL, 0, NULL);
  80
  81         if (ret == FIO_Q_COMPLETED)
  82                 td->cur_depth--;
  83         else if (ret == FIO_Q_QUEUED) {
  84                 unsigned int min_evts;
  85
  86                 if (td->o.iodepth == 1)
  87                         min_evts = 1;
  88                 else
  89                         min_evts = 0;
  90
  91                 ret = io_u_queued_complete(td, min_evts);
  92                 if (ret > 0)
  93                         td->cur_depth -= ret;
  94         }
  95
  96         if (error || td->error)
  97                 pthread_cond_signal(&td->parent->free_cond);
  98
  99         return 0;
 100 }
 101
 102 static bool io_workqueue_pre_sleep_flush_fn(struct submit_worker *sw)
 103 {
 104         struct thread_data *td = sw->priv;
 105
 106         if (td->error)
 107                 return false;
 108         if (td->io_u_queued || td->cur_depth || td->io_u_in_flight)
 109                 return true;
 110
 111         return false;
 112 }
 113
 114 static void io_workqueue_pre_sleep_fn(struct submit_worker *sw)
 115 {
 116         struct thread_data *td = sw->priv;
 117         int ret;
 118
 119         ret = io_u_quiesce(td);
 120         if (ret > 0)
 121                 td->cur_depth -= ret;
 122 }
 123
 124 static int io_workqueue_alloc_fn(struct submit_worker *sw)
 125 {
 126         struct thread_data *td;
 127
 128         td = calloc(1, sizeof(*td));
 129         sw->priv = td;
 130         return 0;
 131 }
 132
 133 static void io_workqueue_free_fn(struct submit_worker *sw)
 134 {
 135         free(sw->priv);
 136         sw->priv = NULL;
 137 }
 138
 139 static int io_workqueue_init_worker_fn(struct submit_worker *sw)
 140 {
 141         struct thread_data *parent = sw->wq->td;
 142         struct thread_data *td = sw->priv;
 143
 144         memcpy(&td->o, &parent->o, sizeof(td->o));
 145         memcpy(&td->ts, &parent->ts, sizeof(td->ts));
 146         td->o.uid = td->o.gid = -1U;
 147         dup_files(td, parent);
 148         td->eo = parent->eo;
 149         fio_options_mem_dupe(td);
 150
 151         if (ioengine_load(td))
 152                 goto err;
 153
 154         td->pid = gettid();
 155
 156         INIT_FLIST_HEAD(&td->io_log_list);
 157         INIT_FLIST_HEAD(&td->io_hist_list);
 158         INIT_FLIST_HEAD(&td->verify_list);
 159         INIT_FLIST_HEAD(&td->trim_list);
 160         td->io_hist_tree = RB_ROOT;
 161
 162         td->o.iodepth = 1;
 163         if (td_io_init(td))
 164                 goto err_io_init;
 165
 166         if (td->io_ops->post_init && td->io_ops->post_init(td))
 167                 goto err_io_init;
 168
 169         set_epoch_time(td, td->o.log_unix_epoch);
 170         fio_getrusage(&td->ru_start);
 171         clear_io_state(td, 1);
 172
 173         td_set_runstate(td, TD_RUNNING);
 174         td->flags |= TD_F_CHILD | TD_F_NEED_LOCK;
 175         td->parent = parent;
 176         return 0;
 177
 178 err_io_init:
 179         close_ioengine(td);
 180 err:
 181         return 1;
 182
 183 }
 184
 185 static void io_workqueue_exit_worker_fn(struct submit_worker *sw,
 186                                         unsigned int *sum_cnt)
 187 {
 188         struct thread_data *td = sw->priv;
 189
 190         (*sum_cnt)++;
 191         sum_thread_stats(&sw->wq->td->ts, &td->ts, *sum_cnt == 1);
 192
 193         fio_options_free(td);
 194         close_and_free_files(td);
 195         if (td->io_ops)
 196                 close_ioengine(td);
 197         td_set_runstate(td, TD_EXITED);
 198 }
 199
 200 #ifdef CONFIG_SFAA
 201 static void sum_val(uint64_t *dst, uint64_t *src)
 202 {
 203         if (*src) {
 204                 __sync_fetch_and_add(dst, *src);
 205                 *src = 0;
 206         }
 207 }
 208 #else
 209 static void sum_val(uint64_t *dst, uint64_t *src)
 210 {
 211         if (*src) {
 212                 *dst += *src;
 213                 *src = 0;
 214         }
 215 }
 216 #endif
 217
 218 static void pthread_double_unlock(pthread_mutex_t *lock1,
 219                                   pthread_mutex_t *lock2)
 220 {
 221 #ifndef CONFIG_SFAA
 222         pthread_mutex_unlock(lock1);
 223         pthread_mutex_unlock(lock2);
 224 #endif
 225 }
 226
 227 static void pthread_double_lock(pthread_mutex_t *lock1, pthread_mutex_t *lock2)
 228 {
 229 #ifndef CONFIG_SFAA
 230         if (lock1 < lock2) {
 231                 pthread_mutex_lock(lock1);
 232                 pthread_mutex_lock(lock2);
 233         } else {
 234                 pthread_mutex_lock(lock2);
 235                 pthread_mutex_lock(lock1);
 236         }
 237 #endif
 238 }
 239
 240 static void sum_ddir(struct thread_data *dst, struct thread_data *src,
 241                      enum fio_ddir ddir)
 242 {
 243         pthread_double_lock(&dst->io_wq.stat_lock, &src->io_wq.stat_lock);
 244
 245         sum_val(&dst->io_bytes[ddir], &src->io_bytes[ddir]);
 246         sum_val(&dst->io_blocks[ddir], &src->io_blocks[ddir]);
 247         sum_val(&dst->this_io_blocks[ddir], &src->this_io_blocks[ddir]);
 248         sum_val(&dst->this_io_bytes[ddir], &src->this_io_bytes[ddir]);
 249         sum_val(&dst->bytes_done[ddir], &src->bytes_done[ddir]);
 250
 251         pthread_double_unlock(&dst->io_wq.stat_lock, &src->io_wq.stat_lock);
 252 }
 253
 254 static void io_workqueue_update_acct_fn(struct submit_worker *sw)
 255 {
 256         struct thread_data *src = sw->priv;
 257         struct thread_data *dst = sw->wq->td;
 258
 259         if (td_read(src))
 260                 sum_ddir(dst, src, DDIR_READ);
 261         if (td_write(src))
 262                 sum_ddir(dst, src, DDIR_WRITE);
 263         if (td_trim(src))
 264                 sum_ddir(dst, src, DDIR_TRIM);
 265
 266 }
 267
 268 static struct workqueue_ops rated_wq_ops = {
 269         .fn                     = io_workqueue_fn,
 270         .pre_sleep_flush_fn     = io_workqueue_pre_sleep_flush_fn,
 271         .pre_sleep_fn           = io_workqueue_pre_sleep_fn,
 272         .update_acct_fn         = io_workqueue_update_acct_fn,
 273         .alloc_worker_fn        = io_workqueue_alloc_fn,
 274         .free_worker_fn         = io_workqueue_free_fn,
 275         .init_worker_fn         = io_workqueue_init_worker_fn,
 276         .exit_worker_fn         = io_workqueue_exit_worker_fn,
 277 };
 278
 279 int rate_submit_init(struct thread_data *td, struct sk_out *sk_out)
 280 {
 281         if (td->o.io_submit_mode != IO_MODE_OFFLOAD)
 282                 return 0;
 283
 284         return workqueue_init(td, &td->io_wq, &rated_wq_ops, td->o.iodepth, sk_out);
 285 }
 286
 287 void rate_submit_exit(struct thread_data *td)
 288 {
 289         if (td->o.io_submit_mode != IO_MODE_OFFLOAD)
 290                 return;
 291
 292         workqueue_exit(&td->io_wq);
 293 }