| 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 | #include "system/dirtyrate.h" |
| 17 | |
| 18 | /* |
| 19 | * Sample 512 pages per GB as default. |
| 20 | */ |
| 21 | #define DIRTYRATE_DEFAULT_SAMPLE_PAGES 512 |
| 22 | |
| 23 | /* |
| 24 | * Record ramblock idstr |
| 25 | */ |
| 26 | #define RAMBLOCK_INFO_MAX_LEN 256 |
| 27 | |
| 28 | /* |
| 29 | * Minimum RAMBlock size to sample, in megabytes. |
| 30 | */ |
| 31 | #define MIN_RAMBLOCK_SIZE 128 |
| 32 | |
| 33 | /* |
| 34 | * Allowed range for dirty page rate calculation (in milliseconds). |
| 35 | * Lower limit relates to the smallest realistic downtime it |
| 36 | * makes sense to impose on migration. |
| 37 | */ |
| 38 | #define MIN_CALC_TIME_MS 50 |
| 39 | #define MAX_CALC_TIME_MS 60000 |
| 40 | |
| 41 | /* |
| 42 | * Take 1/16 pages in 1G as the maxmum sample page count |
| 43 | */ |
| 44 | #define MIN_SAMPLE_PAGE_COUNT 128 |
| 45 | #define MAX_SAMPLE_PAGE_COUNT 16384 |
| 46 | |
| 47 | struct DirtyRateConfig { |
| 48 | uint64_t sample_pages_per_gigabytes; /* sample pages per GB */ |
| 49 | int64_t calc_time_ms; /* desired calculation time (in milliseconds) */ |
| 50 | DirtyRateMeasureMode mode; /* mode of dirtyrate measurement */ |
| 51 | }; |
| 52 | |
| 53 | /* |
| 54 | * Store dirtypage info for each ramblock. |
| 55 | */ |
| 56 | struct RamblockDirtyInfo { |
| 57 | char idstr[RAMBLOCK_INFO_MAX_LEN]; /* idstr for each ramblock */ |
| 58 | uint8_t *ramblock_addr; /* base address of ramblock we measure */ |
| 59 | uint64_t ramblock_pages; /* ramblock size in TARGET_PAGE_SIZE */ |
| 60 | uint64_t *sample_page_vfn; /* relative offset address for sampled page */ |
| 61 | uint64_t sample_pages_count; /* count of sampled pages */ |
| 62 | uint64_t sample_dirty_count; /* count of dirty pages we measure */ |
| 63 | uint32_t *hash_result; /* array of hash result for sampled pages */ |
| 64 | }; |
| 65 | |
| 66 | typedef struct SampleVMStat { |
| 67 | uint64_t total_dirty_samples; /* total dirty sampled page */ |
| 68 | uint64_t total_sample_count; /* total sampled pages */ |
| 69 | uint64_t total_block_mem_MB; /* size of total sampled pages in MB */ |
| 70 | } SampleVMStat; |
| 71 | |
| 72 | /* |
| 73 | * Store calculation statistics for each measure. |
| 74 | */ |
| 75 | struct DirtyRateStat { |
| 76 | int64_t dirty_rate; /* dirty rate in MB/s */ |
| 77 | int64_t start_time; /* calculation start time in units of second */ |
| 78 | int64_t calc_time_ms; /* actual calculation time (in milliseconds) */ |
| 79 | uint64_t sample_pages; /* sample pages per GB */ |
| 80 | union { |
| 81 | SampleVMStat page_sampling; |
| 82 | VcpuStat dirty_ring; |
| 83 | }; |
| 84 | }; |
| 85 | |
| 86 | void *get_dirtyrate_thread(void *arg); |
| 87 | #endif |