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 /* 17 * Sample 512 pages per GB as default. 18 */ 19 #define DIRTYRATE_DEFAULT_SAMPLE_PAGES 512 20 21 /* 22 * Record ramblock idstr 23 */ 24 #define RAMBLOCK_INFO_MAX_LEN 256 25 26 /* 27 * Minimum RAMBlock size to sample, in megabytes. 28 */ 29 #define MIN_RAMBLOCK_SIZE 128 30 31 /* 32 * Take 1s as minimum time for calculation duration 33 */ 34 #define MIN_FETCH_DIRTYRATE_TIME_SEC 1 35 #define MAX_FETCH_DIRTYRATE_TIME_SEC 60 36 37 /* 38 * Take 1/16 pages in 1G as the maxmum sample page count 39 */ 40 #define MIN_SAMPLE_PAGE_COUNT 128 41 #define MAX_SAMPLE_PAGE_COUNT 16384 42 43 struct DirtyRateConfig { 44 uint64_t sample_pages_per_gigabytes; /* sample pages per GB */ 45 int64_t sample_period_seconds; /* time duration between two sampling */ 46 }; 47 48 /* 49 * Store dirtypage info for each ramblock. 50 */ 51 struct RamblockDirtyInfo { 52 char idstr[RAMBLOCK_INFO_MAX_LEN]; /* idstr for each ramblock */ 53 uint8_t *ramblock_addr; /* base address of ramblock we measure */ 54 uint64_t ramblock_pages; /* ramblock size in TARGET_PAGE_SIZE */ 55 uint64_t *sample_page_vfn; /* relative offset address for sampled page */ 56 uint64_t sample_pages_count; /* count of sampled pages */ 57 uint64_t sample_dirty_count; /* count of dirty pages we measure */ 58 uint32_t *hash_result; /* array of hash result for sampled pages */ 59 }; 60 61 /* 62 * Store calculation statistics for each measure. 63 */ 64 struct DirtyRateStat { 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 int64_t dirty_rate; /* dirty rate in MB/s */ 69 int64_t start_time; /* calculation start time in units of second */ 70 int64_t calc_time; /* time duration of two sampling in units of second */ 71 uint64_t sample_pages; /* sample pages per GB */ 72 }; 73 74 void *get_dirtyrate_thread(void *arg); 75 #endif 76