migration: Fix potential race on postcopy_qemufile_src
[qemu/ar7.git] / migration / dirtyrate.h
blob594a5c0bb64c296bd294ed37949e095ddf9209cd
1 /*
2 * Dirtyrate common functions
4 * Copyright (c) 2020 HUAWEI TECHNOLOGIES CO., LTD.
6 * Authors:
7 * Chuan Zheng <zhengchuan@huawei.com>
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.
13 #ifndef QEMU_MIGRATION_DIRTYRATE_H
14 #define QEMU_MIGRATION_DIRTYRATE_H
16 #include "sysemu/dirtyrate.h"
19 * Sample 512 pages per GB as default.
21 #define DIRTYRATE_DEFAULT_SAMPLE_PAGES 512
24 * Record ramblock idstr
26 #define RAMBLOCK_INFO_MAX_LEN 256
29 * Minimum RAMBlock size to sample, in megabytes.
31 #define MIN_RAMBLOCK_SIZE 128
34 * Take 1s as minimum time for calculation duration
36 #define MIN_FETCH_DIRTYRATE_TIME_SEC 1
37 #define MAX_FETCH_DIRTYRATE_TIME_SEC 60
40 * Take 1/16 pages in 1G as the maxmum sample page count
42 #define MIN_SAMPLE_PAGE_COUNT 128
43 #define MAX_SAMPLE_PAGE_COUNT 16384
45 struct DirtyRateConfig {
46 uint64_t sample_pages_per_gigabytes; /* sample pages per GB */
47 int64_t sample_period_seconds; /* time duration between two sampling */
48 DirtyRateMeasureMode mode; /* mode of dirtyrate measurement */
52 * Store dirtypage info for each ramblock.
54 struct RamblockDirtyInfo {
55 char idstr[RAMBLOCK_INFO_MAX_LEN]; /* idstr for each ramblock */
56 uint8_t *ramblock_addr; /* base address of ramblock we measure */
57 uint64_t ramblock_pages; /* ramblock size in TARGET_PAGE_SIZE */
58 uint64_t *sample_page_vfn; /* relative offset address for sampled page */
59 uint64_t sample_pages_count; /* count of sampled pages */
60 uint64_t sample_dirty_count; /* count of dirty pages we measure */
61 uint32_t *hash_result; /* array of hash result for sampled pages */
64 typedef struct SampleVMStat {
65 uint64_t total_dirty_samples; /* total dirty sampled page */
66 uint64_t total_sample_count; /* total sampled pages */
67 uint64_t total_block_mem_MB; /* size of total sampled pages in MB */
68 } SampleVMStat;
71 * Store calculation statistics for each measure.
73 struct DirtyRateStat {
74 int64_t dirty_rate; /* dirty rate in MB/s */
75 int64_t start_time; /* calculation start time in units of second */
76 int64_t calc_time; /* time duration of two sampling in units of second */
77 uint64_t sample_pages; /* sample pages per GB */
78 union {
79 SampleVMStat page_sampling;
80 VcpuStat dirty_ring;
84 void *get_dirtyrate_thread(void *arg);
85 #endif