[qemu.git] / migration / dirtyrate.h

/*
 *  Dirtyrate common functions
 *
 *  Copyright (c) 2020 HUAWEI TECHNOLOGIES CO., LTD.
 *
 *  Authors:
 *  Chuan Zheng <[email protected]>
 *
 *  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.
 * TODO: Make it configurable.
 */
#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

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 */
};

void *get_dirtyrate_thread(void *arg);
#endif
Commit	Line	Data
4240dcee CZ	1	/*
	2	* Dirtyrate common functions
	3	*
	4	* Copyright (c) 2020 HUAWEI TECHNOLOGIES CO., LTD.
	5	*
	6	* Authors:
	7	* Chuan Zheng <[email protected]>
	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	* TODO: Make it configurable.
	19	*/
	20	#define DIRTYRATE_DEFAULT_SAMPLE_PAGES 512
	21
a2635f0a CZ	22	/*
	23	* Record ramblock idstr
	24	*/
	25	#define RAMBLOCK_INFO_MAX_LEN 256
	26
f82583cd CZ	27	/*
	28	* Minimum RAMBlock size to sample, in megabytes.
	29	*/
	30	#define MIN_RAMBLOCK_SIZE 128
	31
eca58224 CZ	32	/*
	33	* Take 1s as minimum time for calculation duration
	34	*/
	35	#define MIN_FETCH_DIRTYRATE_TIME_SEC 1
	36	#define MAX_FETCH_DIRTYRATE_TIME_SEC 60
	37
4240dcee CZ	38	struct DirtyRateConfig {
	39	uint64_t sample_pages_per_gigabytes; /* sample pages per GB */
	40	int64_t sample_period_seconds; /* time duration between two sampling */
	41	};
	42
a2635f0a CZ	43	/*
	44	* Store dirtypage info for each ramblock.
	45	*/
	46	struct RamblockDirtyInfo {
	47	char idstr[RAMBLOCK_INFO_MAX_LEN]; /* idstr for each ramblock */
	48	uint8_t ramblock_addr; / base address of ramblock we measure */
	49	uint64_t ramblock_pages; /* ramblock size in TARGET_PAGE_SIZE */
	50	uint64_t sample_page_vfn; / relative offset address for sampled page */
	51	uint64_t sample_pages_count; /* count of sampled pages */
	52	uint64_t sample_dirty_count; /* count of dirty pages we measure */
	53	uint32_t hash_result; / array of hash result for sampled pages */
	54	};
	55
c9a58d71 CZ	56	/*
	57	* Store calculation statistics for each measure.
	58	*/
	59	struct DirtyRateStat {
	60	uint64_t total_dirty_samples; /* total dirty sampled page */
	61	uint64_t total_sample_count; /* total sampled pages */
	62	uint64_t total_block_mem_MB; /* size of total sampled pages in MB */
	63	int64_t dirty_rate; /* dirty rate in MB/s */
	64	int64_t start_time; /* calculation start time in units of second */
	65	int64_t calc_time; /* time duration of two sampling in units of second */
	66	};
	67
4240dcee CZ	68	void get_dirtyrate_thread(void arg);
4240dcee CZ	69	#endif