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
  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
  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
  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
  68 void *get_dirtyrate_thread(void *arg);
  69 #endif