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