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 * Take 1s as minimum time for calculation duration 35 */ 36 #define MIN_FETCH_DIRTYRATE_TIME_SEC 1 37 #define MAX_FETCH_DIRTYRATE_TIME_SEC 60 38 39 /* 40 * Take 1/16 pages in 1G as the maxmum sample page count 41 */ 42 #define MIN_SAMPLE_PAGE_COUNT 128 43 #define MAX_SAMPLE_PAGE_COUNT 16384 44 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 */ 49 }; 50 51 /* 52 * Store dirtypage info for each ramblock. 53 */ 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 */ 62 }; 63 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; 69 70 /* 71 * Store calculation statistics for each measure. 72 */ 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; 81 }; 82 }; 83 84 void *get_dirtyrate_thread(void *arg); 85 #endif 86