Re: [PATCH v3 03/10] migration/dirtyrate: Add dirtyrate statistics series functions

[Dr. David Alan Gilbert]

* Chuan Zheng (zhengchuan@huawei.com) wrote:
> Add dirtyrate statistics to record/update dirtyrate info.
> 
> Signed-off-by: Chuan Zheng <zhengchuan@huawei.com>
> Signed-off-by: YanYing Zhuang <ann.zhuangyanying@huawei.com>
> ---
>  migration/dirtyrate.c | 30 ++++++++++++++++++++++++++++++
>  migration/dirtyrate.h | 10 ++++++++++
>  2 files changed, 40 insertions(+)
> 
> diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
> index bb0ebe9..8708090 100644
> --- a/migration/dirtyrate.c
> +++ b/migration/dirtyrate.c
> @@ -24,6 +24,7 @@
>  #include "dirtyrate.h"
>  
>  CalculatingDirtyRateState CalculatingState = CAL_DIRTY_RATE_INIT;
> +static struct DirtyRateStat dirty_stat;
>  
>  static int dirty_rate_set_state(int new_state)
>  {
> @@ -40,6 +41,35 @@ static int dirty_rate_set_state(int new_state)
>      return 0;
>  }
>  
> +static void reset_dirtyrate_stat(void)
> +{
> +    dirty_stat.total_dirty_samples = 0;
> +    dirty_stat.total_sample_count = 0;
> +    dirty_stat.total_block_mem_MB = 0;
> +    dirty_stat.dirty_rate = 0;
> +}
> +
> +static void update_dirtyrate_stat(struct RamblockDirtyInfo *info)
> +{
> +    dirty_stat.total_dirty_samples += info->sample_dirty_count;
> +    dirty_stat.total_sample_count += info->sample_pages_count;
> +    /* size of 4K pages in MB */
> +    dirty_stat.total_block_mem_MB += info->ramblock_pages / 256;
> +}
> +
> +static void update_dirtyrate(uint64_t msec)
> +{
> +    uint64_t dirty_rate;
> +    unsigned int total_dirty_samples = dirty_stat.total_dirty_samples;
> +    unsigned int total_sample_count = dirty_stat.total_sample_count;
> +    size_t total_block_mem_MB = dirty_stat.total_block_mem_MB;
> +
> +    dirty_rate = total_dirty_samples * total_block_mem_MB *
> +                 1000 / (total_sample_count * msec);
> +
> +    dirty_stat.dirty_rate = dirty_rate;
> +}
> +
>  static void calculate_dirtyrate(struct DirtyRateConfig config)
>  {
>      /* todo */
> diff --git a/migration/dirtyrate.h b/migration/dirtyrate.h
> index 9650566..af57c80 100644
> --- a/migration/dirtyrate.h
> +++ b/migration/dirtyrate.h
> @@ -57,6 +57,16 @@ struct RamblockDirtyInfo {
>      uint8_t *hash_result; /* array of hash result for sampled pages */
>  };
>  
> +/*
> + * Store calculate statistics for each measure.
> + */
> +struct DirtyRateStat {
> +    unsigned int total_dirty_samples; /* total dirty pages for this measure 
> */
> +    unsigned int total_sample_count; /* total sampled pages for this measure 
> */
> +    size_t total_block_mem_MB; /* size of sampled pages in MB */
> +    int64_t dirty_rate; /* dirty rate for this measure */

As I said in the previous review, please comment 'dirty_rate' with it's
units.

Dave

> +};
> +
>  void *get_dirtyrate_thread(void *arg);
>  #endif
>  
> -- 
> 1.8.3.1
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK