[igt-dev] [PATCH i-g-t 3/4] tools/intel_gpu_top: Optimise interactive display a bit

[Kamil Konieczny]

Hi Tvrtko,
On 2023-10-11 at 09:38:44 +0100, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Padding the percentage bars and table columns with spaces happens quite a
> lot so lets do better than putchar at a time. Have a table of visually
> empty strings and build the required length out of those chunks.
> 
> While at it, also move the percentage bar table into its function scope.
> 
> v2:
>  * Fix checkpatch and use ARRAY_SIZE. (Kamil)
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Cc: Kamil Konieczny <kamil.konieczny at linux.intel.com>

Reviewed-by: Kamil Konieczny <kamil.konieczny at linux.intel.com>

> ---
>  tools/intel_gpu_top.c | 38 +++++++++++++++++++++++++++++++++-----
>  1 file changed, 33 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/intel_gpu_top.c b/tools/intel_gpu_top.c
> index b6d1014f00b8..006879c4ae67 100644
> --- a/tools/intel_gpu_top.c
> +++ b/tools/intel_gpu_top.c
> @@ -926,14 +926,39 @@ static void free_display_clients(struct igt_drm_clients *clients)
>  	free(clients);
>  }
>  
> -static const char *bars[] = { " ", "▏", "▎", "▍", "▌", "▋", "▊", "▉", "█" };
> -
>  static int n_spaces(const int n)
>  {
> -	int i;
> +	static const char *spaces[] = {
> +		" ",
> +		"  ",
> +		"   ",
> +		"    ",
> +		"     ",
> +		"      ",
> +		"       ",
> +		"        ",
> +		"         ",
> +		"          ",
> +		"           ",
> +		"            ",
> +		"             ",
> +		"              ",
> +		"               ",
> +		"                ",
> +		"                 ",
> +		"                  ",
> +		"                   ",
> +	};
> +	int i, r = n;
>  
> -	for (i = 0; i < n; i++)
> -		putchar(' ');
> +	while (r) {
> +		if (r > ARRAY_SIZE(spaces))
> +			i = ARRAY_SIZE(spaces) - 1;
> +		else
> +			i = r - 1;
> +		fputs(spaces[i], stdout);
> +		r -= i + 1;
> +	}
>  
>  	return n;
>  }
> @@ -941,6 +966,9 @@ static int n_spaces(const int n)
>  static void
>  print_percentage_bar(double percent, double max, int max_len, bool numeric)
>  {
> +	static const char *bars[] = {
> +		" ", "▏", "▎", "▍", "▌", "▋", "▊", "▉", "█"
> +	};
>  	int bar_len, i, len = max_len - 2;
>  	const int w = 8;
>  
> -- 
> 2.39.2
>