jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
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
32typedef struct BlockAcctTimedStats BlockAcctTimedStats;
33typedef struct BlockAcctStats BlockAcctStats;
34
35enum BlockAcctType {
36 BLOCK_ACCT_NONE = 0,
37 BLOCK_ACCT_READ,
38 BLOCK_ACCT_WRITE,
39 BLOCK_ACCT_FLUSH,
40 BLOCK_ACCT_UNMAP,
41 BLOCK_MAX_IOTYPE,
42};
43
44struct BlockAcctTimedStats {
45 BlockAcctStats *stats;
46 TimedAverage latency[BLOCK_MAX_IOTYPE];
47 unsigned interval_length; /* in seconds */
48 QSLIST_ENTRY(BlockAcctTimedStats) entries;
49};
50
51typedef struct BlockLatencyHistogram {
52 /* The following histogram is represented like this:
53 *
54 * 5| *
55 * 4| *
56 * 3| * *
57 * 2| * * *
58 * 1| * * * *
59 * +------------------
60 * 10 50 100
61 *
62 * BlockLatencyHistogram histogram = {
63 * .nbins = 4,
64 * .boundaries = {10, 50, 100},
65 * .bins = {3, 1, 5, 2},
66 * };
67 *
68 * @boundaries array define histogram intervals as follows:
69 * [0, boundaries[0]), [boundaries[0], boundaries[1]), ...
70 * [boundaries[nbins-2], +inf)
71 *
72 * So, for example above, histogram intervals are:
73 * [0, 10), [10, 50), [50, 100), [100, +inf)
74 */
75 int nbins;
76 uint64_t *boundaries; /* @nbins-1 numbers here
77 (all boundaries, except 0 and +inf) */
78 uint64_t *bins;
79} BlockLatencyHistogram;
80
81struct BlockAcctStats {
82 QemuMutex lock;
83 uint64_t nr_bytes[BLOCK_MAX_IOTYPE];
84 uint64_t nr_ops[BLOCK_MAX_IOTYPE];
85 uint64_t invalid_ops[BLOCK_MAX_IOTYPE];
86 uint64_t failed_ops[BLOCK_MAX_IOTYPE];
87 uint64_t total_time_ns[BLOCK_MAX_IOTYPE];
88 uint64_t merged[BLOCK_MAX_IOTYPE];
89 int64_t last_access_time_ns;
90 QSLIST_HEAD(, BlockAcctTimedStats) intervals;
91 bool account_invalid;
92 bool account_failed;
93 BlockLatencyHistogram latency_histogram[BLOCK_MAX_IOTYPE];
94};
95
96typedef struct BlockAcctCookie {
97 int64_t bytes;
98 int64_t start_time_ns;
99 enum BlockAcctType type;
100} BlockAcctCookie;
101
102void block_acct_init(BlockAcctStats *stats);
103void block_acct_setup(BlockAcctStats *stats, bool account_invalid,
104 bool account_failed);
105void block_acct_cleanup(BlockAcctStats *stats);
106void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length);
107BlockAcctTimedStats *block_acct_interval_next(BlockAcctStats *stats,
108 BlockAcctTimedStats *s);
109void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
110 int64_t bytes, enum BlockAcctType type);
111void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie);
112void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie);
113void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type);
114void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
115 int num_requests);
116int64_t block_acct_idle_time_ns(BlockAcctStats *stats);
117double block_acct_queue_depth(BlockAcctTimedStats *stats,
118 enum BlockAcctType type);
119int block_latency_histogram_set(BlockAcctStats *stats, enum BlockAcctType type,
120 uint64List *boundaries);
121void block_latency_histograms_clear(BlockAcctStats *stats);
122
123#endif