qemu/migration/dirtyrate.h
Hyman Huang(黄勇) 7afa08cd8f migration/dirtyrate: make sample page count configurable
introduce optional sample-pages argument in calc-dirty-rate,
making sample page count per GB configurable so that more
accurate dirtyrate can be calculated.

Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
Message-Id: <3103453a3b2796f929269c99a6ad81a9a7f1f405.1623027729.git.huangy81@chinatelecom.cn>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  Wrapped a couple of long lines
2021-06-08 20:18:25 +01:00

76 lines
2.3 KiB
C

/*
* 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 */
};
/*
* 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 */
};
/*
* Store calculation statistics for each measure.
*/
struct DirtyRateStat {
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 */
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 */
};
void *get_dirtyrate_thread(void *arg);
#endif