/* * Dirtyrate common functions * * Copyright (c) 2020 HUAWEI TECHNOLOGIES CO., LTD. * * Authors: * Chuan Zheng <zhengchuan@huawei.com> * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. */ #ifndef QEMU_MIGRATION_DIRTYRATE_H #define QEMU_MIGRATION_DIRTYRATE_H #include "sysemu/dirtyrate.h" /* * Sample 512 pages per GB as default. */ #define DIRTYRATE_DEFAULT_SAMPLE_PAGES 512 /* * Record ramblock idstr */ #define RAMBLOCK_INFO_MAX_LEN 256 /* * Minimum RAMBlock size to sample, in megabytes. */ #define MIN_RAMBLOCK_SIZE 128 /* * Allowed range for dirty page rate calculation (in milliseconds). * Lower limit relates to the smallest realistic downtime it * makes sense to impose on migration. */ #define MIN_CALC_TIME_MS 50 #define MAX_CALC_TIME_MS 60000 /* * Take 1/16 pages in 1G as the maxmum sample page count */ #define MIN_SAMPLE_PAGE_COUNT 128 #define MAX_SAMPLE_PAGE_COUNT 16384 struct DirtyRateConfig { uint64_t sample_pages_per_gigabytes; /* sample pages per GB */ int64_t calc_time_ms; /* desired calculation time (in milliseconds) */ DirtyRateMeasureMode mode; /* mode of dirtyrate measurement */ }; /* * Store dirtypage info for each ramblock. */ struct RamblockDirtyInfo { char idstr[RAMBLOCK_INFO_MAX_LEN]; /* idstr for each ramblock */ uint8_t *ramblock_addr; /* base address of ramblock we measure */ uint64_t ramblock_pages; /* ramblock size in TARGET_PAGE_SIZE */ uint64_t *sample_page_vfn; /* relative offset address for sampled page */ uint64_t sample_pages_count; /* count of sampled pages */ uint64_t sample_dirty_count; /* count of dirty pages we measure */ uint32_t *hash_result; /* array of hash result for sampled pages */ }; typedef struct SampleVMStat { uint64_t total_dirty_samples; /* total dirty sampled page */ uint64_t total_sample_count; /* total sampled pages */ uint64_t total_block_mem_MB; /* size of total sampled pages in MB */ } SampleVMStat; /* * Store calculation statistics for each measure. */ struct DirtyRateStat { int64_t dirty_rate; /* dirty rate in MB/s */ int64_t start_time; /* calculation start time in units of second */ int64_t calc_time_ms; /* actual calculation time (in milliseconds) */ uint64_t sample_pages; /* sample pages per GB */ union { SampleVMStat page_sampling; VcpuStat dirty_ring; }; }; void *get_dirtyrate_thread(void *arg); #endif