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/*
* 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
/*
* 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
/*
* Take 1s as minimum time for calculation duration
*/
#define MIN_FETCH_DIRTYRATE_TIME_SEC 1
#define MAX_FETCH_DIRTYRATE_TIME_SEC 60
/*
* 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 sample_period_seconds; /* time duration between two sampling */
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;
typedef struct VcpuStat {
int nvcpu; /* number of vcpu */
DirtyRateVcpu *rates; /* array of dirty rate for each vcpu */
} VcpuStat;
/*
* 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; /* time duration of two sampling in units of second */
uint64_t sample_pages; /* sample pages per GB */
union {
SampleVMStat page_sampling;
VcpuStat dirty_ring;
};
};
void *get_dirtyrate_thread(void *arg);
#endif
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