Update version for v6.0.0-rc3 release
[qemu.git] / migration / dirtyrate.h
1 /*
2 * Dirtyrate common functions
3 *
4 * Copyright (c) 2020 HUAWEI TECHNOLOGIES CO., LTD.
5 *
6 * Authors:
7 * Chuan Zheng <zhengchuan@huawei.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
11 */
12
13 #ifndef QEMU_MIGRATION_DIRTYRATE_H
14 #define QEMU_MIGRATION_DIRTYRATE_H
15
16 /*
17 * Sample 512 pages per GB as default.
18 * TODO: Make it configurable.
19 */
20 #define DIRTYRATE_DEFAULT_SAMPLE_PAGES 512
21
22 /*
23 * Record ramblock idstr
24 */
25 #define RAMBLOCK_INFO_MAX_LEN 256
26
27 /*
28 * Minimum RAMBlock size to sample, in megabytes.
29 */
30 #define MIN_RAMBLOCK_SIZE 128
31
32 /*
33 * Take 1s as minimum time for calculation duration
34 */
35 #define MIN_FETCH_DIRTYRATE_TIME_SEC 1
36 #define MAX_FETCH_DIRTYRATE_TIME_SEC 60
37
38 struct DirtyRateConfig {
39 uint64_t sample_pages_per_gigabytes; /* sample pages per GB */
40 int64_t sample_period_seconds; /* time duration between two sampling */
41 };
42
43 /*
44 * Store dirtypage info for each ramblock.
45 */
46 struct RamblockDirtyInfo {
47 char idstr[RAMBLOCK_INFO_MAX_LEN]; /* idstr for each ramblock */
48 uint8_t *ramblock_addr; /* base address of ramblock we measure */
49 uint64_t ramblock_pages; /* ramblock size in TARGET_PAGE_SIZE */
50 uint64_t *sample_page_vfn; /* relative offset address for sampled page */
51 uint64_t sample_pages_count; /* count of sampled pages */
52 uint64_t sample_dirty_count; /* count of dirty pages we measure */
53 uint32_t *hash_result; /* array of hash result for sampled pages */
54 };
55
56 /*
57 * Store calculation statistics for each measure.
58 */
59 struct DirtyRateStat {
60 uint64_t total_dirty_samples; /* total dirty sampled page */
61 uint64_t total_sample_count; /* total sampled pages */
62 uint64_t total_block_mem_MB; /* size of total sampled pages in MB */
63 int64_t dirty_rate; /* dirty rate in MB/s */
64 int64_t start_time; /* calculation start time in units of second */
65 int64_t calc_time; /* time duration of two sampling in units of second */
66 };
67
68 void *get_dirtyrate_thread(void *arg);
69 #endif