1 /* 2 * QEMU System Emulator block accounting 3 * 4 * Copyright (c) 2011 Christoph Hellwig 5 * Copyright (c) 2015 Igalia, S.L. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 #ifndef BLOCK_ACCOUNTING_H 26 #define BLOCK_ACCOUNTING_H 27 28 #include "qemu/timed-average.h" 29 30 typedef struct BlockAcctTimedStats BlockAcctTimedStats; 31 32 enum BlockAcctType { 33 BLOCK_ACCT_READ, 34 BLOCK_ACCT_WRITE, 35 BLOCK_ACCT_FLUSH, 36 BLOCK_MAX_IOTYPE, 37 }; 38 39 struct BlockAcctTimedStats { 40 TimedAverage latency[BLOCK_MAX_IOTYPE]; 41 unsigned interval_length; /* in seconds */ 42 QSLIST_ENTRY(BlockAcctTimedStats) entries; 43 }; 44 45 typedef struct BlockAcctStats { 46 uint64_t nr_bytes[BLOCK_MAX_IOTYPE]; 47 uint64_t nr_ops[BLOCK_MAX_IOTYPE]; 48 uint64_t invalid_ops[BLOCK_MAX_IOTYPE]; 49 uint64_t failed_ops[BLOCK_MAX_IOTYPE]; 50 uint64_t total_time_ns[BLOCK_MAX_IOTYPE]; 51 uint64_t merged[BLOCK_MAX_IOTYPE]; 52 int64_t last_access_time_ns; 53 QSLIST_HEAD(, BlockAcctTimedStats) intervals; 54 bool account_invalid; 55 bool account_failed; 56 } BlockAcctStats; 57 58 typedef struct BlockAcctCookie { 59 int64_t bytes; 60 int64_t start_time_ns; 61 enum BlockAcctType type; 62 } BlockAcctCookie; 63 64 void block_acct_init(BlockAcctStats *stats, bool account_invalid, 65 bool account_failed); 66 void block_acct_cleanup(BlockAcctStats *stats); 67 void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length); 68 BlockAcctTimedStats *block_acct_interval_next(BlockAcctStats *stats, 69 BlockAcctTimedStats *s); 70 void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie, 71 int64_t bytes, enum BlockAcctType type); 72 void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie); 73 void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie); 74 void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type); 75 void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type, 76 int num_requests); 77 int64_t block_acct_idle_time_ns(BlockAcctStats *stats); 78 double block_acct_queue_depth(BlockAcctTimedStats *stats, 79 enum BlockAcctType type); 80 81 #endif 82