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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
32static QEMUClockType clock_type = QEMU_CLOCK_REALTIME;
33static const int qtest_latency_ns = NANOSECONDS_PER_SECOND / 1000;
34
35void 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
43void 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
50void 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
59void 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
77BlockAcctTimedStats *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
87void 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
98
99
100
101
102
103static int block_latency_histogram_compare_func(const void *key, const void *it)
104{
105 uint64_t k = *(uint64_t *)key;
106 uint64_t a = ((uint64_t *)it)[0];
107 uint64_t b = ((uint64_t *)it)[1];
108
109 return k < a ? -1 : (k < b ? 0 : 1);
110}
111
112static void block_latency_histogram_account(BlockLatencyHistogram *hist,
113 int64_t latency_ns)
114{
115 uint64_t *pos;
116
117 if (hist->bins == NULL) {
118
119 return;
120 }
121
122
123 if (latency_ns < hist->boundaries[0]) {
124 hist->bins[0]++;
125 return;
126 }
127
128 if (latency_ns >= hist->boundaries[hist->nbins - 2]) {
129 hist->bins[hist->nbins - 1]++;
130 return;
131 }
132
133 pos = bsearch(&latency_ns, hist->boundaries, hist->nbins - 2,
134 sizeof(hist->boundaries[0]),
135 block_latency_histogram_compare_func);
136 assert(pos != NULL);
137
138 hist->bins[pos - hist->boundaries + 1]++;
139}
140
141int block_latency_histogram_set(BlockAcctStats *stats, enum BlockAcctType type,
142 uint64List *boundaries)
143{
144 BlockLatencyHistogram *hist = &stats->latency_histogram[type];
145 uint64List *entry;
146 uint64_t *ptr;
147 uint64_t prev = 0;
148 int new_nbins = 1;
149
150 for (entry = boundaries; entry; entry = entry->next) {
151 if (entry->value <= prev) {
152 return -EINVAL;
153 }
154 new_nbins++;
155 prev = entry->value;
156 }
157
158 hist->nbins = new_nbins;
159 g_free(hist->boundaries);
160 hist->boundaries = g_new(uint64_t, hist->nbins - 1);
161 for (entry = boundaries, ptr = hist->boundaries; entry;
162 entry = entry->next, ptr++)
163 {
164 *ptr = entry->value;
165 }
166
167 g_free(hist->bins);
168 hist->bins = g_new0(uint64_t, hist->nbins);
169
170 return 0;
171}
172
173void block_latency_histograms_clear(BlockAcctStats *stats)
174{
175 int i;
176
177 for (i = 0; i < BLOCK_MAX_IOTYPE; i++) {
178 BlockLatencyHistogram *hist = &stats->latency_histogram[i];
179 g_free(hist->bins);
180 g_free(hist->boundaries);
181 memset(hist, 0, sizeof(*hist));
182 }
183}
184
185static void block_account_one_io(BlockAcctStats *stats, BlockAcctCookie *cookie,
186 bool failed)
187{
188 BlockAcctTimedStats *s;
189 int64_t time_ns = qemu_clock_get_ns(clock_type);
190 int64_t latency_ns = time_ns - cookie->start_time_ns;
191
192 if (qtest_enabled()) {
193 latency_ns = qtest_latency_ns;
194 }
195
196 assert(cookie->type < BLOCK_MAX_IOTYPE);
197
198 if (cookie->type == BLOCK_ACCT_NONE) {
199 return;
200 }
201
202 WITH_QEMU_LOCK_GUARD(&stats->lock) {
203 if (failed) {
204 stats->failed_ops[cookie->type]++;
205 } else {
206 stats->nr_bytes[cookie->type] += cookie->bytes;
207 stats->nr_ops[cookie->type]++;
208 }
209
210 block_latency_histogram_account(&stats->latency_histogram[cookie->type],
211 latency_ns);
212
213 if (!failed || stats->account_failed) {
214 stats->total_time_ns[cookie->type] += latency_ns;
215 stats->last_access_time_ns = time_ns;
216
217 QSLIST_FOREACH(s, &stats->intervals, entries) {
218 timed_average_account(&s->latency[cookie->type], latency_ns);
219 }
220 }
221 }
222
223 cookie->type = BLOCK_ACCT_NONE;
224}
225
226void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie)
227{
228 block_account_one_io(stats, cookie, false);
229}
230
231void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie)
232{
233 block_account_one_io(stats, cookie, true);
234}
235
236void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type)
237{
238 assert(type < BLOCK_MAX_IOTYPE);
239
240
241
242
243
244 qemu_mutex_lock(&stats->lock);
245 stats->invalid_ops[type]++;
246
247 if (stats->account_invalid) {
248 stats->last_access_time_ns = qemu_clock_get_ns(clock_type);
249 }
250 qemu_mutex_unlock(&stats->lock);
251}
252
253void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
254 int num_requests)
255{
256 assert(type < BLOCK_MAX_IOTYPE);
257
258 qemu_mutex_lock(&stats->lock);
259 stats->merged[type] += num_requests;
260 qemu_mutex_unlock(&stats->lock);
261}
262
263int64_t block_acct_idle_time_ns(BlockAcctStats *stats)
264{
265 return qemu_clock_get_ns(clock_type) - stats->last_access_time_ns;
266}
267
268double block_acct_queue_depth(BlockAcctTimedStats *stats,
269 enum BlockAcctType type)
270{
271 uint64_t sum, elapsed;
272
273 assert(type < BLOCK_MAX_IOTYPE);
274
275 qemu_mutex_lock(&stats->stats->lock);
276 sum = timed_average_sum(&stats->latency[type], &elapsed);
277 qemu_mutex_unlock(&stats->stats->lock);
278
279 return (double) sum / elapsed;
280}
281