Re: [Qemu-devel] [PATCH 03/12] migration: fix counting xbzrle cache_miss_rate

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* guangrong.xiao@gmail.com (guangrong.xiao@gmail.com) wrote:
> From: Xiao Guangrong <xiaoguangrong@tencent.com>
> 
> Sync up xbzrle_cache_miss_prev only after migration iteration goes
> forward
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com>

Yeh, I think you're right.


Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
>  migration/ram.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/migration/ram.c b/migration/ram.c
> index dbf24d8c87..dd1283dd45 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -1189,9 +1189,9 @@ static void migration_bitmap_sync(RAMState *rs)
>                     (double)(xbzrle_counters.cache_miss -
>                              rs->xbzrle_cache_miss_prev) /
>                     (rs->iterations - rs->iterations_prev);
> +                rs->xbzrle_cache_miss_prev = xbzrle_counters.cache_miss;
>              }
>              rs->iterations_prev = rs->iterations;
> -            rs->xbzrle_cache_miss_prev = xbzrle_counters.cache_miss;
>          }
>  
>          /* reset period counters */
> -- 
> 2.14.4
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK