blob: 869c0609412e5ee29c1aac0e8f59334b4a6c0cda (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/*
* Dirtyrate common functions
*
* Copyright (c) 2020 HUAWEI TECHNOLOGIES CO., LTD.
*
* Authors:
* Chuan Zheng <zhengchuan@huawei.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef QEMU_MIGRATION_DIRTYRATE_H
#define QEMU_MIGRATION_DIRTYRATE_H
#include "sysemu/dirtyrate.h"
/*
* Sample 512 pages per GB as default.
*/
#define DIRTYRATE_DEFAULT_SAMPLE_PAGES 512
/*
* Record ramblock idstr
*/
#define RAMBLOCK_INFO_MAX_LEN 256
/*
* Minimum RAMBlock size to sample, in megabytes.
*/
#define MIN_RAMBLOCK_SIZE 128
/*
* Allowed range for dirty page rate calculation (in milliseconds).
* Lower limit relates to the smallest realistic downtime it
* makes sense to impose on migration.
*/
#define MIN_CALC_TIME_MS 50
#define MAX_CALC_TIME_MS 60000
/*
* Take 1/16 pages in 1G as the maxmum sample page count
*/
#define MIN_SAMPLE_PAGE_COUNT 128
#define MAX_SAMPLE_PAGE_COUNT 16384
struct DirtyRateConfig {
uint64_t sample_pages_per_gigabytes; /* sample pages per GB */
int64_t calc_time_ms; /* desired calculation time (in milliseconds) */
DirtyRateMeasureMode mode; /* mode of dirtyrate measurement */
};
/*
* Store dirtypage info for each ramblock.
*/
struct RamblockDirtyInfo {
char idstr[RAMBLOCK_INFO_MAX_LEN]; /* idstr for each ramblock */
uint8_t *ramblock_addr; /* base address of ramblock we measure */
uint64_t ramblock_pages; /* ramblock size in TARGET_PAGE_SIZE */
uint64_t *sample_page_vfn; /* relative offset address for sampled page */
uint64_t sample_pages_count; /* count of sampled pages */
uint64_t sample_dirty_count; /* count of dirty pages we measure */
uint32_t *hash_result; /* array of hash result for sampled pages */
};
typedef struct SampleVMStat {
uint64_t total_dirty_samples; /* total dirty sampled page */
uint64_t total_sample_count; /* total sampled pages */
uint64_t total_block_mem_MB; /* size of total sampled pages in MB */
} SampleVMStat;
/*
* Store calculation statistics for each measure.
*/
struct DirtyRateStat {
int64_t dirty_rate; /* dirty rate in MB/s */
int64_t start_time; /* calculation start time in units of second */
int64_t calc_time_ms; /* actual calculation time (in milliseconds) */
uint64_t sample_pages; /* sample pages per GB */
union {
SampleVMStat page_sampling;
VcpuStat dirty_ring;
};
};
void *get_dirtyrate_thread(void *arg);
#endif
|
