Line data    Source code

       1             : /*
       2             :  * Copyright (C) 2016 Andrea Mazzoleni
       3             :  *
       4             :  * This program is free software: you can redistribute it and/or modify
       5             :  * it under the terms of the GNU General Public License as published by
       6             :  * the Free Software Foundation, either version 3 of the License, or
       7             :  * (at your option) any later version.
       8             :  *
       9             :  * This program is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12             :  * GNU General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU General Public License
      15             :  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
      16             :  */
      17             : 
      18             : #include "portable.h"
      19             : 
      20             : #include "bw.h"
      21             : 
      22         215 : void bw_init(struct snapraid_bw* bw, uint64_t limit)
      23             : {
      24         215 :         bw->limit = limit;
      25         215 :         bw->total = 0;
      26         215 :         bw->start = tick_ms();
      27         215 : }
      28             : 
      29     9469208 : void bw_limit(struct snapraid_bw* bw, uint64_t bytes)
      30             : {
      31     9469208 :         if (!bw || bw->limit == 0)
      32     9469152 :                 return;
      33             : 
      34          56 :         uint64_t elapsed = tick_ms() - bw->start;
      35             :         uint64_t done;
      36             :         uint64_t eta;
      37             : 
      38          56 :         done = __atomic_fetch_add(&bw->total, bytes, __ATOMIC_SEQ_CST);
      39             : 
      40          56 :         eta = done * 1000 / bw->limit;
      41             : 
      42          56 :         if (eta > elapsed) {
      43          49 :                 eta -= elapsed;
      44          49 :                 usleep(eta * 1000);
      45             :         }
      46             : }
      47             :