Re: [RFC PATCH 7/8] migration/dirtyrate: Implement calculate_dirtyrate() function

[Dr. David Alan Gilbert]

* Chuan Zheng (zhengchuan@huawei.com) wrote:
> From: Zheng Chuan <zhengchuan@huawei.com>
> 
> Implement calculate_dirtyrate() function.
> 
> Signed-off-by: Zheng Chuan <zhengchuan@huawei.com>
> Signed-off-by: YanYing Zhang <ann.zhuangyanying@huawei.com>
> ---
>  migration/dirtyrate.c | 53 
> +++++++++++++++++++++++++++++++++++++++++++++------
>  1 file changed, 47 insertions(+), 6 deletions(-)
> 
> diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
> index 00abfa7..d87e16d 100644
> --- a/migration/dirtyrate.c
> +++ b/migration/dirtyrate.c
> @@ -161,6 +161,21 @@ alloc_block_dirty_info(int *block_index,
>      return block_dinfo;
>  }
>  
> +static void free_block_dirty_info(struct block_dirty_info *infos, int count)
> +{
> +    int i;
> +
> +    if (!infos) {
> +        return;
> +    }
> +
> +    for (i = 0; i < count; i++) {
> +        g_free(infos[i].sample_page_vfn);
> +        g_free(infos[i].hash_result);
> +    }
> +    g_free(infos);
> +}
> +
>  static int ram_block_skip(RAMBlock *block)
>  {
>      if (!strstr(qemu_ram_get_idstr(block), "ram-node") &&
> @@ -278,12 +293,6 @@ static int compare_block_hash_info(struct 
> block_dirty_info *info, int block_inde
>      return 0;
>  }
>  
> -
> -static void calculate_dirtyrate(struct dirtyrate_config config, int64_t time)
> -{
> -    /* todo */
> -}

Please move this function in the earlier patches so that it's only added
once rather than moved later.

>  /*
>   * There are multithread will write/read *calculating_dirty_rate_stage*,
>   * we can protect only one thread write/read it by libvirt api.
> @@ -320,6 +329,38 @@ static int64_t get_sample_gap_period(struct 
> dirtyrate_config config)
>      return msec;
>  }
>  
> +static void calculate_dirtyrate(struct dirtyrate_config config, int64_t time)
> +{
> +    struct block_dirty_info *block_dinfo = NULL;
> +    int block_index = 0;
> +    int64_t msec = time;
> +    int64_t initial_time;

you might like to add some trace_ calls to make this easier to debug.

Dave

> +    rcu_register_thread();
> +    reset_dirtyrate_stat();
> +    initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
> +    rcu_read_lock();
> +    if (record_block_hash_info(config, &block_dinfo, &block_index) < 0) {
> +        goto out;
> +    }
> +    rcu_read_unlock();
> +
> +    msec = block_sample_gap_period(msec, initial_time);
> +
> +    rcu_read_lock();
> +    if (compare_block_hash_info(block_dinfo, block_index) < 0) {
> +        goto out;
> +    }
> +
> +    update_dirtyrate(msec);
> +
> +out:
> +    rcu_read_unlock();
> +    free_block_dirty_info(block_dinfo, block_index + 1);
> +    rcu_unregister_thread();
> +}
> +
> +
>  void *get_dirtyrate_thread(void *arg)
>  {
>      struct dirtyrate_config config = *(struct dirtyrate_config *)arg;
> -- 
> 1.8.3.1
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK