migration/dirtyrate: skip sampling ramblock with size below MIN_RAMBLOCK_SIZE
[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 struct DirtyRateConfig {
33 uint64_t sample_pages_per_gigabytes; /* sample pages per GB */
34 int64_t sample_period_seconds; /* time duration between two sampling */
35 };
36
37 /*
38 * Store dirtypage info for each ramblock.
39 */
40 struct RamblockDirtyInfo {
41 char idstr[RAMBLOCK_INFO_MAX_LEN]; /* idstr for each ramblock */
42 uint8_t *ramblock_addr; /* base address of ramblock we measure */
43 uint64_t ramblock_pages; /* ramblock size in TARGET_PAGE_SIZE */
44 uint64_t *sample_page_vfn; /* relative offset address for sampled page */
45 uint64_t sample_pages_count; /* count of sampled pages */
46 uint64_t sample_dirty_count; /* count of dirty pages we measure */
47 uint32_t *hash_result; /* array of hash result for sampled pages */
48 };
49
50 /*
51 * Store calculation statistics for each measure.
52 */
53 struct DirtyRateStat {
54 uint64_t total_dirty_samples; /* total dirty sampled page */
55 uint64_t total_sample_count; /* total sampled pages */
56 uint64_t total_block_mem_MB; /* size of total sampled pages in MB */
57 int64_t dirty_rate; /* dirty rate in MB/s */
58 int64_t start_time; /* calculation start time in units of second */
59 int64_t calc_time; /* time duration of two sampling in units of second */
60 };
61
62 void *get_dirtyrate_thread(void *arg);
63 #endif