LXR qemu/migration/dirtyrate.h

   1/*
   2 *  Dirtyrate common functions
   3 *
   4 *  Copyright (c) 2020 HUAWEI TECHNOLOGIES CO., LTD.
   5 *
   6 *  Authors:
   7 *  Chuan Zheng <zhengchuan@huawei.com>
   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
  22/*
  23 * Record ramblock idstr
  24 */
  25#define RAMBLOCK_INFO_MAX_LEN                     256
  26
  27/*
  28 * Minimum RAMBlock size to sample, in megabytes.
  29 */
  30#define MIN_RAMBLOCK_SIZE                         128
  31
  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
  38struct 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
  43/*
  44 * Store dirtypage info for each ramblock.
  45 */
  46struct 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
  56/*
  57 * Store calculation statistics for each measure.
  58 */
  59struct 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
  68void *get_dirtyrate_thread(void *arg);
  69#endif
  70