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 #include "sysemu/dirtyrate.h"
  17
  18 /*
  19  * Sample 512 pages per GB as default.
  20  */
  21 #define DIRTYRATE_DEFAULT_SAMPLE_PAGES            512
  22
  23 /*
  24  * Record ramblock idstr
  25  */
  26 #define RAMBLOCK_INFO_MAX_LEN                     256
  27
  28 /*
  29  * Minimum RAMBlock size to sample, in megabytes.
  30  */
  31 #define MIN_RAMBLOCK_SIZE                         128
  32
  33 /*
  34  * Take 1s as minimum time for calculation duration
  35  */
  36 #define MIN_FETCH_DIRTYRATE_TIME_SEC              1
  37 #define MAX_FETCH_DIRTYRATE_TIME_SEC              60
  38
  39 /*
  40  * Take 1/16 pages in 1G as the maxmum sample page count
  41  */
  42 #define MIN_SAMPLE_PAGE_COUNT                     128
  43 #define MAX_SAMPLE_PAGE_COUNT                     16384
  44
  45 struct DirtyRateConfig {
  46     uint64_t sample_pages_per_gigabytes; /* sample pages per GB */
  47     int64_t sample_period_seconds; /* time duration between two sampling */
  48     DirtyRateMeasureMode mode; /* mode of dirtyrate measurement */
  49 };
  50
  51 /*
  52  * Store dirtypage info for each ramblock.
  53  */
  54 struct RamblockDirtyInfo {
  55     char idstr[RAMBLOCK_INFO_MAX_LEN]; /* idstr for each ramblock */
  56     uint8_t *ramblock_addr; /* base address of ramblock we measure */
  57     uint64_t ramblock_pages; /* ramblock size in TARGET_PAGE_SIZE */
  58     uint64_t *sample_page_vfn; /* relative offset address for sampled page */
  59     uint64_t sample_pages_count; /* count of sampled pages */
  60     uint64_t sample_dirty_count; /* count of dirty pages we measure */
  61     uint32_t *hash_result; /* array of hash result for sampled pages */
  62 };
  63
  64 typedef struct SampleVMStat {
  65     uint64_t total_dirty_samples; /* total dirty sampled page */
  66     uint64_t total_sample_count; /* total sampled pages */
  67     uint64_t total_block_mem_MB; /* size of total sampled pages in MB */
  68 } SampleVMStat;
  69
  70 /*
  71  * Store calculation statistics for each measure.
  72  */
  73 struct DirtyRateStat {
  74     int64_t dirty_rate; /* dirty rate in MB/s */
  75     int64_t start_time; /* calculation start time in units of second */
  76     int64_t calc_time; /* time duration of two sampling in units of second */
  77     uint64_t sample_pages; /* sample pages per GB */
  78     union {
  79         SampleVMStat page_sampling;
  80         VcpuStat dirty_ring;
  81     };
  82 };
  83
  84 void *get_dirtyrate_thread(void *arg);
  85 #endif