[igt-dev] [PATCH i-g-t] intel_gpu_top: Document how to use JSON output

[Tvrtko Ursulin]

On 31/03/2021 10:12, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Put a note on how to use JSON output into the man page.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> References: https://gitlab.freedesktop.org/drm/igt-gpu-tools/-/issues/100
> ---
>   man/intel_gpu_top.rst | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/man/intel_gpu_top.rst b/man/intel_gpu_top.rst
> index f6d74852558b..94fdc6520fd3 100644
> --- a/man/intel_gpu_top.rst
> +++ b/man/intel_gpu_top.rst
> @@ -81,6 +81,11 @@ Filter types: ::
>       pci      pci:[vendor=%04x/name][,device=%04x][,card=%d]
>                vendor is hex number or vendor name
>   
> +JSON OUTPUT
> +===========
> +
> +To parse the JSON as output by the tool the consumer should wrap its entirety into square brackets ([ ]). This will make each sample point an JSON array element and will avoid "Multiple root elements" JSON validation error.
> +

Or as an alternative we make the tool do this, but it'd need a signal 
handler to print the closing bracket at which point I thought it could 
be a complication too far. Could be convinced either way I guess.

Regards,

Tvrtko

>   LIMITATIONS
>   ===========
>   
>