[igt-dev] [Intel-gfx] [PATCH i-g-t 4/4] tools/intel_gpu_top: Handle narrow terminals more gracefully

[Tvrtko Ursulin]

On 10/10/2023 17:43, Kamil Konieczny wrote:
> Hi Tvrtko,
> On 2023-10-10 at 12:07:14 +0100, Tvrtko Ursulin wrote:
>> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>>
>> Instead of asserting just skip trying to print columns when terminal is
>> too narrow.
>>
>> At the same time fix some type confusion to fix calculations going huge.
>>
>> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>> Closes: https://gitlab.freedesktop.org/drm/igt-gpu-tools/-/issues/143
> 
> Did you tested this in screensaver? I mean running intel_gpu_top
> in terminal windows under X (Gnome or other) and leaving desktop
> unattanded, entering screen saver mode (possible with screen
> turned off) and then re-enabling screen?

I tested it by resizing the terminal to crazy small dimensions and 
confirmed asserts and endless printing of spaces failure modes are 
fixed. Also under the screen lock.

But no DPMS and no console screensavers.

> 
>> ---
>>   tools/intel_gpu_top.c | 12 +++++++-----
>>   1 file changed, 7 insertions(+), 5 deletions(-)
>>
>> diff --git a/tools/intel_gpu_top.c b/tools/intel_gpu_top.c
>> index 472ce3f13ba9..6d1397cb8214 100644
>> --- a/tools/intel_gpu_top.c
>> +++ b/tools/intel_gpu_top.c
>> @@ -926,7 +926,7 @@ static void free_display_clients(struct igt_drm_clients *clients)
>>   	free(clients);
>>   }
>>   
>> -static unsigned int n_spaces(const unsigned int n)
>> +static int n_spaces(const int n)
> --------- ^^^
> Could you make it int at your first patch touching this function?

Honestly no, can't be bothered to churn this too much. I think argument 
can be made that this patch is fixing type confusion in many places so 
hopefully you can accept it as is.

Regards,

Tvrtko

> 
> With or without this suggestion,
> Reviewed-by: Kamil Konieczny <kamil.konieczny at linux.intel.com>
> 
> Regards,
> Kamil
> 
>>   {
>>   	static const char *spaces[] = {
>>   		" ",
>> @@ -950,7 +950,7 @@ static unsigned int n_spaces(const unsigned int n)
>>   		"                   ",
>>   #define MAX_SPACES 19
>>   	};
>> -	unsigned int i, r = n;
>> +	int i, r = n;
>>   
>>   	while (r) {
>>   		if (r > MAX_SPACES)
>> @@ -972,7 +972,8 @@ print_percentage_bar(double percent, double max, int max_len, bool numeric)
>>   	int bar_len, i, len = max_len - 2;
>>   	const int w = 8;
>>   
>> -	assert(max_len > 0);
>> +	if (len < 2) /* For edge lines '|' */
>> +		return;
>>   
>>   	bar_len = ceil(w * percent * len / max);
>>   	if (bar_len > w * len)
>> @@ -986,6 +987,8 @@ print_percentage_bar(double percent, double max, int max_len, bool numeric)
>>   		printf("%s", bars[i]);
>>   
>>   	len -= (bar_len + (w - 1)) / w;
>> +	if (len < 1)
>> +		return;
>>   	n_spaces(len);
>>   
>>   	putchar('|');
>> @@ -2001,8 +2004,7 @@ print_clients_header(struct igt_drm_clients *clients, int lines,
>>   				 4 : clients->max_name_len; /* At least "NAME" */
>>   
>>   	if (output_mode == INTERACTIVE) {
>> -		unsigned int num_active = 0;
>> -		int len;
>> +		int len, num_active = 0;
>>   
>>   		if (lines++ >= con_h)
>>   			return lines;
>> -- 
>> 2.39.2
>>