block/accounting.c

   1 /*
   2  * QEMU System Emulator block accounting
   3  *
   4  * Copyright (c) 2011 Christoph Hellwig
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "block/accounting.h"
  26 #include "block/block_int.h"
  27 #include "qemu/timer.h"
  28
  29 void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
  30                       int64_t bytes, enum BlockAcctType type)
  31 {
  32     assert(type < BLOCK_MAX_IOTYPE);
  33
  34     cookie->bytes = bytes;
  35     cookie->start_time_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
  36     cookie->type = type;
  37 }
  38
  39 void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie)
  40 {
  41     assert(cookie->type < BLOCK_MAX_IOTYPE);
  42
  43     stats->nr_bytes[cookie->type] += cookie->bytes;
  44     stats->nr_ops[cookie->type]++;
  45     stats->total_time_ns[cookie->type] +=
  46         qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - cookie->start_time_ns;
  47 }
  48
  49
  50 void block_acct_highest_sector(BlockAcctStats *stats, int64_t sector_num,
  51                                unsigned int nb_sectors)
  52 {
  53     if (stats->wr_highest_sector < sector_num + nb_sectors - 1) {
  54         stats->wr_highest_sector = sector_num + nb_sectors - 1;
  55     }
  56 }
  57
  58 void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
  59                       int num_requests)
  60 {
  61     assert(type < BLOCK_MAX_IOTYPE);
  62     stats->merged[type] += num_requests;
  63 }