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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 #include "qemu/thread.h"
30 #include "qapi/qapi-types-common.h"
31
32 typedef struct BlockAcctTimedStats BlockAcctTimedStats;
33 typedef struct BlockAcctStats BlockAcctStats;
34
35 enum BlockAcctType {
36 BLOCK_ACCT_NONE = 0,
37 BLOCK_ACCT_READ,
38 BLOCK_ACCT_WRITE,
39 BLOCK_ACCT_FLUSH,
40 BLOCK_ACCT_ZONE_APPEND,
41 BLOCK_ACCT_UNMAP,
42 BLOCK_MAX_IOTYPE,
43 };
44
45 struct BlockAcctTimedStats {
46 BlockAcctStats *stats;
47 TimedAverage latency[BLOCK_MAX_IOTYPE];
48 unsigned interval_length; /* in seconds */
49 QSLIST_ENTRY(BlockAcctTimedStats) entries;
50 };
51
52 typedef struct BlockLatencyHistogram {
53 /* The following histogram is represented like this:
54 *
55 * 5| *
56 * 4| *
57 * 3| * *
58 * 2| * * *
59 * 1| * * * *
60 * +------------------
61 * 10 50 100
62 *
63 * BlockLatencyHistogram histogram = {
64 * .nbins = 4,
65 * .boundaries = {10, 50, 100},
66 * .bins = {3, 1, 5, 2},
67 * };
68 *
69 * @boundaries array define histogram intervals as follows:
70 * [0, boundaries[0]), [boundaries[0], boundaries[1]), ...
71 * [boundaries[nbins-2], +inf)
72 *
73 * So, for example above, histogram intervals are:
74 * [0, 10), [10, 50), [50, 100), [100, +inf)
75 */
76 int nbins;
77 uint64_t *boundaries; /* @nbins-1 numbers here
78 (all boundaries, except 0 and +inf) */
79 uint64_t *bins;
80 } BlockLatencyHistogram;
81
82 struct BlockAcctStats {
83 QemuMutex lock;
84 uint64_t nr_bytes[BLOCK_MAX_IOTYPE];
85 uint64_t nr_ops[BLOCK_MAX_IOTYPE];
86 uint64_t invalid_ops[BLOCK_MAX_IOTYPE];
87 uint64_t failed_ops[BLOCK_MAX_IOTYPE];
88 uint64_t total_time_ns[BLOCK_MAX_IOTYPE];
89 uint64_t merged[BLOCK_MAX_IOTYPE];
90 int64_t last_access_time_ns;
91 QSLIST_HEAD(, BlockAcctTimedStats) intervals;
92 bool account_invalid;
93 bool account_failed;
94 BlockLatencyHistogram latency_histogram[BLOCK_MAX_IOTYPE];
95 };
96
97 typedef struct BlockAcctCookie {
98 int64_t bytes;
99 int64_t start_time_ns;
100 enum BlockAcctType type;
101 } BlockAcctCookie;
102
103 void block_acct_init(BlockAcctStats *stats);
104 bool block_acct_setup(BlockAcctStats *stats, enum OnOffAuto account_invalid,
105 enum OnOffAuto account_failed, uint32_t *stats_intervals,
106 uint32_t num_stats_intervals, Error **errp);
107 void block_acct_cleanup(BlockAcctStats *stats);
108 void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length);
109 BlockAcctTimedStats *block_acct_interval_next(BlockAcctStats *stats,
110 BlockAcctTimedStats *s);
111 void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
112 int64_t bytes, enum BlockAcctType type);
113 void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie);
114 void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie);
115 void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type);
116 void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
117 int num_requests);
118 int64_t block_acct_idle_time_ns(BlockAcctStats *stats);
119 /* Caller must hold stats->stats->lock. */
120 double block_acct_queue_depth(BlockAcctTimedStats *stats,
121 enum BlockAcctType type);
122 int block_latency_histogram_set(BlockAcctStats *stats, enum BlockAcctType type,
123 uint64List *boundaries);
124 void block_latency_histograms_clear(BlockAcctStats *stats);
125
126 #endif