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;
  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                 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         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         return 0;
  97 }
  98
  99 static bool io_workqueue_pre_sleep_flush_fn(struct submit_worker *sw)
 100 {
 101         struct thread_data *td = sw->priv;
 102
 103         if (td->io_u_queued || td->cur_depth || td->io_u_in_flight)
 104                 return true;
 105
 106         return false;
 107 }
 108
 109 static void io_workqueue_pre_sleep_fn(struct submit_worker *sw)
 110 {
 111         struct thread_data *td = sw->priv;
 112         int ret;
 113
 114         ret = io_u_quiesce(td);
 115         if (ret > 0)
 116                 td->cur_depth -= ret;
 117 }
 118
 119 static int io_workqueue_alloc_fn(struct submit_worker *sw)
 120 {
 121         struct thread_data *td;
 122
 123         td = calloc(1, sizeof(*td));
 124         sw->priv = td;
 125         return 0;
 126 }
 127
 128 static void io_workqueue_free_fn(struct submit_worker *sw)
 129 {
 130         free(sw->priv);
 131         sw->priv = NULL;
 132 }
 133
 134 static int io_workqueue_init_worker_fn(struct submit_worker *sw)
 135 {
 136         struct thread_data *parent = sw->wq->td;
 137         struct thread_data *td = sw->priv;
 138
 139         memcpy(&td->o, &parent->o, sizeof(td->o));
 140         memcpy(&td->ts, &parent->ts, sizeof(td->ts));
 141         td->o.uid = td->o.gid = -1U;
 142         dup_files(td, parent);
 143         td->eo = parent->eo;
 144         fio_options_mem_dupe(td);
 145
 146         if (ioengine_load(td))
 147                 goto err;
 148
 149         td->pid = gettid();
 150
 151         INIT_FLIST_HEAD(&td->io_log_list);
 152         INIT_FLIST_HEAD(&td->io_hist_list);
 153         INIT_FLIST_HEAD(&td->verify_list);
 154         INIT_FLIST_HEAD(&td->trim_list);
 155         td->io_hist_tree = RB_ROOT;
 156
 157         td->o.iodepth = 1;
 158         if (td_io_init(td))
 159                 goto err_io_init;
 160
 161         set_epoch_time(td, td->o.log_unix_epoch);
 162         fio_getrusage(&td->ru_start);
 163         clear_io_state(td, 1);
 164
 165         td_set_runstate(td, TD_RUNNING);
 166         td->flags |= TD_F_CHILD | TD_F_NEED_LOCK;
 167         td->parent = parent;
 168         return 0;
 169
 170 err_io_init:
 171         close_ioengine(td);
 172 err:
 173         return 1;
 174
 175 }
 176
 177 static void io_workqueue_exit_worker_fn(struct submit_worker *sw,
 178                                         unsigned int *sum_cnt)
 179 {
 180         struct thread_data *td = sw->priv;
 181
 182         (*sum_cnt)++;
 183         sum_thread_stats(&sw->wq->td->ts, &td->ts, *sum_cnt == 1);
 184
 185         fio_options_free(td);
 186         close_and_free_files(td);
 187         if (td->io_ops)
 188                 close_ioengine(td);
 189         td_set_runstate(td, TD_EXITED);
 190 }
 191
 192 #ifdef CONFIG_SFAA
 193 static void sum_val(uint64_t *dst, uint64_t *src)
 194 {
 195         if (*src) {
 196                 __sync_fetch_and_add(dst, *src);
 197                 *src = 0;
 198         }
 199 }
 200 #else
 201 static void sum_val(uint64_t *dst, uint64_t *src)
 202 {
 203         if (*src) {
 204                 *dst += *src;
 205                 *src = 0;
 206         }
 207 }
 208 #endif
 209
 210 static void pthread_double_unlock(pthread_mutex_t *lock1,
 211                                   pthread_mutex_t *lock2)
 212 {
 213 #ifndef CONFIG_SFAA
 214         pthread_mutex_unlock(lock1);
 215         pthread_mutex_unlock(lock2);
 216 #endif
 217 }
 218
 219 static void pthread_double_lock(pthread_mutex_t *lock1, pthread_mutex_t *lock2)
 220 {
 221 #ifndef CONFIG_SFAA
 222         if (lock1 < lock2) {
 223                 pthread_mutex_lock(lock1);
 224                 pthread_mutex_lock(lock2);
 225         } else {
 226                 pthread_mutex_lock(lock2);
 227                 pthread_mutex_lock(lock1);
 228         }
 229 #endif
 230 }
 231
 232 static void sum_ddir(struct thread_data *dst, struct thread_data *src,
 233                      enum fio_ddir ddir)
 234 {
 235         pthread_double_lock(&dst->io_wq.stat_lock, &src->io_wq.stat_lock);
 236
 237         sum_val(&dst->io_bytes[ddir], &src->io_bytes[ddir]);
 238         sum_val(&dst->io_blocks[ddir], &src->io_blocks[ddir]);
 239         sum_val(&dst->this_io_blocks[ddir], &src->this_io_blocks[ddir]);
 240         sum_val(&dst->this_io_bytes[ddir], &src->this_io_bytes[ddir]);
 241         sum_val(&dst->bytes_done[ddir], &src->bytes_done[ddir]);
 242
 243         pthread_double_unlock(&dst->io_wq.stat_lock, &src->io_wq.stat_lock);
 244 }
 245
 246 static void io_workqueue_update_acct_fn(struct submit_worker *sw)
 247 {
 248         struct thread_data *src = sw->priv;
 249         struct thread_data *dst = sw->wq->td;
 250
 251         if (td_read(src))
 252                 sum_ddir(dst, src, DDIR_READ);
 253         if (td_write(src))
 254                 sum_ddir(dst, src, DDIR_WRITE);
 255         if (td_trim(src))
 256                 sum_ddir(dst, src, DDIR_TRIM);
 257
 258 }
 259
 260 static struct workqueue_ops rated_wq_ops = {
 261         .fn                     = io_workqueue_fn,
 262         .pre_sleep_flush_fn     = io_workqueue_pre_sleep_flush_fn,
 263         .pre_sleep_fn           = io_workqueue_pre_sleep_fn,
 264         .update_acct_fn         = io_workqueue_update_acct_fn,
 265         .alloc_worker_fn        = io_workqueue_alloc_fn,
 266         .free_worker_fn         = io_workqueue_free_fn,
 267         .init_worker_fn         = io_workqueue_init_worker_fn,
 268         .exit_worker_fn         = io_workqueue_exit_worker_fn,
 269 };
 270
 271 int rate_submit_init(struct thread_data *td, struct sk_out *sk_out)
 272 {
 273         if (td->o.io_submit_mode != IO_MODE_OFFLOAD)
 274                 return 0;
 275
 276         return workqueue_init(td, &td->io_wq, &rated_wq_ops, td->o.iodepth, sk_out);
 277 }
 278
 279 void rate_submit_exit(struct thread_data *td)
 280 {
 281         if (td->o.io_submit_mode != IO_MODE_OFFLOAD)
 282                 return;
 283
 284         workqueue_exit(&td->io_wq);
 285 }