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 #include <stdbool.h> 29 30 #include "qemu/typedefs.h" 31 #include "qemu/timed-average.h" 32 33 typedef struct BlockAcctTimedStats BlockAcctTimedStats; 34 35 enum BlockAcctType { 36 BLOCK_ACCT_READ, 37 BLOCK_ACCT_WRITE, 38 BLOCK_ACCT_FLUSH, 39 BLOCK_MAX_IOTYPE, 40 }; 41 42 struct BlockAcctTimedStats { 43 TimedAverage latency[BLOCK_MAX_IOTYPE]; 44 unsigned interval_length; /* in seconds */ 45 QSLIST_ENTRY(BlockAcctTimedStats) entries; 46 }; 47 48 typedef struct BlockAcctStats { 49 uint64_t nr_bytes[BLOCK_MAX_IOTYPE]; 50 uint64_t nr_ops[BLOCK_MAX_IOTYPE]; 51 uint64_t invalid_ops[BLOCK_MAX_IOTYPE]; 52 uint64_t failed_ops[BLOCK_MAX_IOTYPE]; 53 uint64_t total_time_ns[BLOCK_MAX_IOTYPE]; 54 uint64_t merged[BLOCK_MAX_IOTYPE]; 55 int64_t last_access_time_ns; 56 QSLIST_HEAD(, BlockAcctTimedStats) intervals; 57 bool account_invalid; 58 bool account_failed; 59 } BlockAcctStats; 60 61 typedef struct BlockAcctCookie { 62 int64_t bytes; 63 int64_t start_time_ns; 64 enum BlockAcctType type; 65 } BlockAcctCookie; 66 67 void block_acct_init(BlockAcctStats *stats, bool account_invalid, 68 bool account_failed); 69 void block_acct_cleanup(BlockAcctStats *stats); 70 void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length); 71 BlockAcctTimedStats *block_acct_interval_next(BlockAcctStats *stats, 72 BlockAcctTimedStats *s); 73 void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie, 74 int64_t bytes, enum BlockAcctType type); 75 void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie); 76 void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie); 77 void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type); 78 void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type, 79 int num_requests); 80 int64_t block_acct_idle_time_ns(BlockAcctStats *stats); 81 82 #endif 83