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 static QEMUClockType clock_type = QEMU_CLOCK_REALTIME; 30 31 void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie, 32 int64_t bytes, enum BlockAcctType type) 33 { 34 assert(type < BLOCK_MAX_IOTYPE); 35 36 cookie->bytes = bytes; 37 cookie->start_time_ns = qemu_clock_get_ns(clock_type); 38 cookie->type = type; 39 } 40 41 void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie) 42 { 43 int64_t time_ns = qemu_clock_get_ns(clock_type); 44 int64_t latency_ns = time_ns - cookie->start_time_ns; 45 46 assert(cookie->type < BLOCK_MAX_IOTYPE); 47 48 stats->nr_bytes[cookie->type] += cookie->bytes; 49 stats->nr_ops[cookie->type]++; 50 stats->total_time_ns[cookie->type] += latency_ns; 51 stats->last_access_time_ns = time_ns; 52 } 53 54 55 void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type, 56 int num_requests) 57 { 58 assert(type < BLOCK_MAX_IOTYPE); 59 stats->merged[type] += num_requests; 60 } 61 62 int64_t block_acct_idle_time_ns(BlockAcctStats *stats) 63 { 64 return qemu_clock_get_ns(clock_type) - stats->last_access_time_ns; 65 } 66