include/block/accounting.h

   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 #ifndef BLOCK_ACCOUNTING_H
  25 #define BLOCK_ACCOUNTING_H
  26
  27 #include <stdint.h>
  28
  29 #include "qemu/typedefs.h"
  30
  31 enum BlockAcctType {
  32     BLOCK_ACCT_READ,
  33     BLOCK_ACCT_WRITE,
  34     BLOCK_ACCT_FLUSH,
  35     BLOCK_MAX_IOTYPE,
  36 };
  37
  38 typedef struct BlockAcctStats {
  39     uint64_t nr_bytes[BLOCK_MAX_IOTYPE];
  40     uint64_t nr_ops[BLOCK_MAX_IOTYPE];
  41     uint64_t total_time_ns[BLOCK_MAX_IOTYPE];
  42     uint64_t merged[BLOCK_MAX_IOTYPE];
  43 } BlockAcctStats;
  44
  45 typedef struct BlockAcctCookie {
  46     int64_t bytes;
  47     int64_t start_time_ns;
  48     enum BlockAcctType type;
  49 } BlockAcctCookie;
  50
  51 void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
  52                       int64_t bytes, enum BlockAcctType type);
  53 void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie);
  54 void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
  55                            int num_requests);
  56
  57 #endif