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 26 #include "qemu/osdep.h" 27 #include "block/accounting.h" 28 #include "block/block_int.h" 29 #include "qemu/timer.h" 30 #include "sysemu/qtest.h" 31 32 static QEMUClockType clock_type = QEMU_CLOCK_REALTIME; 33 static const int qtest_latency_ns = NANOSECONDS_PER_SECOND / 1000; 34 35 void block_acct_init(BlockAcctStats *stats) 36 { 37 qemu_mutex_init(&stats->lock); 38 if (qtest_enabled()) { 39 clock_type = QEMU_CLOCK_VIRTUAL; 40 } 41 } 42 43 void block_acct_setup(BlockAcctStats *stats, bool account_invalid, 44 bool account_failed) 45 { 46 stats->account_invalid = account_invalid; 47 stats->account_failed = account_failed; 48 } 49 50 void block_acct_cleanup(BlockAcctStats *stats) 51 { 52 BlockAcctTimedStats *s, *next; 53 QSLIST_FOREACH_SAFE(s, &stats->intervals, entries, next) { 54 g_free(s); 55 } 56 qemu_mutex_destroy(&stats->lock); 57 } 58 59 void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length) 60 { 61 BlockAcctTimedStats *s; 62 unsigned i; 63 64 s = g_new0(BlockAcctTimedStats, 1); 65 s->interval_length = interval_length; 66 s->stats = stats; 67 qemu_mutex_lock(&stats->lock); 68 QSLIST_INSERT_HEAD(&stats->intervals, s, entries); 69 70 for (i = 0; i < BLOCK_MAX_IOTYPE; i++) { 71 timed_average_init(&s->latency[i], clock_type, 72 (uint64_t) interval_length * NANOSECONDS_PER_SECOND); 73 } 74 qemu_mutex_unlock(&stats->lock); 75 } 76 77 BlockAcctTimedStats *block_acct_interval_next(BlockAcctStats *stats, 78 BlockAcctTimedStats *s) 79 { 80 if (s == NULL) { 81 return QSLIST_FIRST(&stats->intervals); 82 } else { 83 return QSLIST_NEXT(s, entries); 84 } 85 } 86 87 void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie, 88 int64_t bytes, enum BlockAcctType type) 89 { 90 assert(type < BLOCK_MAX_IOTYPE); 91 92 cookie->bytes = bytes; 93 cookie->start_time_ns = qemu_clock_get_ns(clock_type); 94 cookie->type = type; 95 } 96 97 static void block_account_one_io(BlockAcctStats *stats, BlockAcctCookie *cookie, 98 bool failed) 99 { 100 BlockAcctTimedStats *s; 101 int64_t time_ns = qemu_clock_get_ns(clock_type); 102 int64_t latency_ns = time_ns - cookie->start_time_ns; 103 104 if (qtest_enabled()) { 105 latency_ns = qtest_latency_ns; 106 } 107 108 assert(cookie->type < BLOCK_MAX_IOTYPE); 109 110 qemu_mutex_lock(&stats->lock); 111 112 if (failed) { 113 stats->failed_ops[cookie->type]++; 114 } else { 115 stats->nr_bytes[cookie->type] += cookie->bytes; 116 stats->nr_ops[cookie->type]++; 117 } 118 119 if (!failed || stats->account_failed) { 120 stats->total_time_ns[cookie->type] += latency_ns; 121 stats->last_access_time_ns = time_ns; 122 123 QSLIST_FOREACH(s, &stats->intervals, entries) { 124 timed_average_account(&s->latency[cookie->type], latency_ns); 125 } 126 } 127 128 qemu_mutex_unlock(&stats->lock); 129 } 130 131 void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie) 132 { 133 block_account_one_io(stats, cookie, false); 134 } 135 136 void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie) 137 { 138 block_account_one_io(stats, cookie, true); 139 } 140 141 void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type) 142 { 143 assert(type < BLOCK_MAX_IOTYPE); 144 145 /* block_account_one_io() updates total_time_ns[], but this one does 146 * not. The reason is that invalid requests are accounted during their 147 * submission, therefore there's no actual I/O involved. 148 */ 149 qemu_mutex_lock(&stats->lock); 150 stats->invalid_ops[type]++; 151 152 if (stats->account_invalid) { 153 stats->last_access_time_ns = qemu_clock_get_ns(clock_type); 154 } 155 qemu_mutex_unlock(&stats->lock); 156 } 157 158 void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type, 159 int num_requests) 160 { 161 assert(type < BLOCK_MAX_IOTYPE); 162 163 qemu_mutex_lock(&stats->lock); 164 stats->merged[type] += num_requests; 165 qemu_mutex_unlock(&stats->lock); 166 } 167 168 int64_t block_acct_idle_time_ns(BlockAcctStats *stats) 169 { 170 return qemu_clock_get_ns(clock_type) - stats->last_access_time_ns; 171 } 172 173 double block_acct_queue_depth(BlockAcctTimedStats *stats, 174 enum BlockAcctType type) 175 { 176 uint64_t sum, elapsed; 177 178 assert(type < BLOCK_MAX_IOTYPE); 179 180 qemu_mutex_lock(&stats->stats->lock); 181 sum = timed_average_sum(&stats->latency[type], &elapsed); 182 qemu_mutex_unlock(&stats->stats->lock); 183 184 return (double) sum / elapsed; 185 } 186