]>
Commit | Line | Data |
---|---|---|
5e5a94b6 BC |
1 | /* |
2 | * QEMU System Emulator block accounting | |
3 | * | |
4 | * Copyright (c) 2011 Christoph Hellwig | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | ||
25 | #include "block/accounting.h" | |
26 | #include "block/block_int.h" | |
a56ebc6b | 27 | #include "qemu/timer.h" |
5e5a94b6 | 28 | |
5519593c AG |
29 | static QEMUClockType clock_type = QEMU_CLOCK_REALTIME; |
30 | ||
5366d0c8 BC |
31 | void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie, |
32 | int64_t bytes, enum BlockAcctType type) | |
5e5a94b6 | 33 | { |
28298fd3 | 34 | assert(type < BLOCK_MAX_IOTYPE); |
5e5a94b6 BC |
35 | |
36 | cookie->bytes = bytes; | |
5519593c | 37 | cookie->start_time_ns = qemu_clock_get_ns(clock_type); |
5e5a94b6 BC |
38 | cookie->type = type; |
39 | } | |
40 | ||
5366d0c8 | 41 | void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie) |
5e5a94b6 | 42 | { |
cb38fffb AG |
43 | int64_t time_ns = qemu_clock_get_ns(clock_type); |
44 | int64_t latency_ns = time_ns - cookie->start_time_ns; | |
45 | ||
28298fd3 | 46 | assert(cookie->type < BLOCK_MAX_IOTYPE); |
5e5a94b6 | 47 | |
5366d0c8 BC |
48 | stats->nr_bytes[cookie->type] += cookie->bytes; |
49 | stats->nr_ops[cookie->type]++; | |
cb38fffb AG |
50 | stats->total_time_ns[cookie->type] += latency_ns; |
51 | stats->last_access_time_ns = time_ns; | |
5e5a94b6 BC |
52 | } |
53 | ||
7ee12daf AG |
54 | void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie) |
55 | { | |
56 | int64_t time_ns = qemu_clock_get_ns(clock_type); | |
57 | ||
58 | assert(cookie->type < BLOCK_MAX_IOTYPE); | |
59 | ||
60 | stats->failed_ops[cookie->type]++; | |
61 | stats->total_time_ns[cookie->type] += time_ns - cookie->start_time_ns; | |
62 | stats->last_access_time_ns = time_ns; | |
63 | } | |
64 | ||
65 | void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type) | |
66 | { | |
67 | assert(type < BLOCK_MAX_IOTYPE); | |
68 | ||
69 | /* block_acct_done() and block_acct_failed() update | |
70 | * total_time_ns[], but this one does not. The reason is that | |
71 | * invalid requests are accounted during their submission, | |
72 | * therefore there's no actual I/O involved. */ | |
73 | ||
74 | stats->invalid_ops[type]++; | |
75 | stats->last_access_time_ns = qemu_clock_get_ns(clock_type); | |
76 | } | |
5e5a94b6 | 77 | |
f4564d53 PL |
78 | void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type, |
79 | int num_requests) | |
80 | { | |
81 | assert(type < BLOCK_MAX_IOTYPE); | |
82 | stats->merged[type] += num_requests; | |
83 | } | |
cb38fffb AG |
84 | |
85 | int64_t block_acct_idle_time_ns(BlockAcctStats *stats) | |
86 | { | |
87 | return qemu_clock_get_ns(clock_type) - stats->last_access_time_ns; | |
88 | } |