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