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  */
  19 #define DIRTYRATE_DEFAULT_SAMPLE_PAGES            512
  20
  21 /*
  22  * Record ramblock idstr
  23  */
  24 #define RAMBLOCK_INFO_MAX_LEN                     256
  25
  26 /*
  27  * Minimum RAMBlock size to sample, in megabytes.
  28  */
  29 #define MIN_RAMBLOCK_SIZE                         128
  30
  31 /*
  32  * Take 1s as minimum time for calculation duration
  33  */
  34 #define MIN_FETCH_DIRTYRATE_TIME_SEC              1
  35 #define MAX_FETCH_DIRTYRATE_TIME_SEC              60
  36
  37 /*
  38  * Take 1/16 pages in 1G as the maxmum sample page count
  39  */
  40 #define MIN_SAMPLE_PAGE_COUNT                     128
  41 #define MAX_SAMPLE_PAGE_COUNT                     16384
  42
  43 struct DirtyRateConfig {
  44     uint64_t sample_pages_per_gigabytes; /* sample pages per GB */
  45     int64_t sample_period_seconds; /* time duration between two sampling */
  46     DirtyRateMeasureMode mode; /* mode of dirtyrate measurement */
  47 };
  48
  49 /*
  50  * Store dirtypage info for each ramblock.
  51  */
  52 struct RamblockDirtyInfo {
  53     char idstr[RAMBLOCK_INFO_MAX_LEN]; /* idstr for each ramblock */
  54     uint8_t *ramblock_addr; /* base address of ramblock we measure */
  55     uint64_t ramblock_pages; /* ramblock size in TARGET_PAGE_SIZE */
  56     uint64_t *sample_page_vfn; /* relative offset address for sampled page */
  57     uint64_t sample_pages_count; /* count of sampled pages */
  58     uint64_t sample_dirty_count; /* count of dirty pages we measure */
  59     uint32_t *hash_result; /* array of hash result for sampled pages */
  60 };
  61
  62 typedef struct SampleVMStat {
  63     uint64_t total_dirty_samples; /* total dirty sampled page */
  64     uint64_t total_sample_count; /* total sampled pages */
  65     uint64_t total_block_mem_MB; /* size of total sampled pages in MB */
  66 } SampleVMStat;
  67
  68 typedef struct VcpuStat {
  69     int nvcpu; /* number of vcpu */
  70     DirtyRateVcpu *rates; /* array of dirty rate for each vcpu */
  71 } VcpuStat;
  72
  73 /*
  74  * Store calculation statistics for each measure.
  75  */
  76 struct DirtyRateStat {
  77     int64_t dirty_rate; /* dirty rate in MB/s */
  78     int64_t start_time; /* calculation start time in units of second */
  79     int64_t calc_time; /* time duration of two sampling in units of second */
  80     uint64_t sample_pages; /* sample pages per GB */
  81     union {
  82         SampleVMStat page_sampling;
  83         VcpuStat dirty_ring;
  84     };
  85 };
  86
  87 void *get_dirtyrate_thread(void *arg);
  88 #endif