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 "sysemu/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 88