netdev - Re: [PATCH v2 bpf-next 2/2] bpftool: Documentation for bpftool prog profile

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Message-ID: <18194adf-2f74-6cf1-42c4-4645aec863ae@isovalent.com>
Date:   Mon, 2 Mar 2020 13:36:45 +0000
From:   Quentin Monnet <quentin@...valent.com>
To:     Song Liu <songliubraving@...com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     kernel-team@...com, ast@...nel.org, daniel@...earbox.net,
        arnaldo.melo@...il.com, jolsa@...nel.org
Subject: Re: [PATCH v2 bpf-next 2/2] bpftool: Documentation for bpftool prog
 profile

2020-02-28 15:40 UTC-0800 ~ Song Liu <songliubraving@...com>
> Add documentation for the new bpftool prog profile command.
> 
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  .../bpf/bpftool/Documentation/bpftool-prog.rst  | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
> index 46862e85fed2..1e2549dcd926 100644
> --- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst
> +++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
> @@ -30,6 +30,7 @@ PROG COMMANDS
>  |	**bpftool** **prog detach** *PROG* *ATTACH_TYPE* [*MAP*]
>  |	**bpftool** **prog tracelog**
>  |	**bpftool** **prog run** *PROG* **data_in** *FILE* [**data_out** *FILE* [**data_size_out** *L*]] [**ctx_in** *FILE* [**ctx_out** *FILE* [**ctx_size_out** *M*]]] [**repeat** *N*]
> +|	**bpftool** **prog profile** [*DURATION*] *PROG* *METRICs*
>  |	**bpftool** **prog help**
>  |
>  |	*MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
> @@ -48,6 +49,9 @@ PROG COMMANDS
>  |       *ATTACH_TYPE* := {
>  |		**msg_verdict** | **stream_verdict** | **stream_parser** | **flow_dissector**
>  |	}
> +|	*METRIC* := {
> +|		**cycles** | **instructions** | **l1d_loads** | **llc_misses**
> +|	}
>  
>  
>  DESCRIPTION
> @@ -189,6 +193,10 @@ DESCRIPTION
>  		  not all of them can take the **ctx_in**/**ctx_out**
>  		  arguments. bpftool does not perform checks on program types.
>  
> +	**bpftool prog profile** *DURATION* *PROG* *METRICs*

If I understand correctly DURATION is optional. Could you please add
square brackets around it? Could you please also specify what it
defaults to if user does not pass the value?

> +		  Profile *METRICs* for bpf program *PROG* for *DURATION*
> +		  seconds.
> +
>  	**bpftool prog help**
>  		  Print short help message.
>  
> @@ -311,6 +319,15 @@ EXAMPLES
>  
>  **# rm /sys/fs/bpf/xdp1**
>  
> +|
> +| **# bpftool prog profile 10 id 337 cycles instructions llc_misses**
> +
> +::
> +         51397 run_cnt
> +      40176203 cycles                                                 (83.05%)
> +      42518139 instructions    #   1.06 insn per cycle                (83.39%)
> +           123 llc_misses      #   2.89 LLC misses per million isns   (83.15%)
> +
>  SEE ALSO
>  ========
>  	**bpf**\ (2),
> 

Could you please also add bash completion for the new subcommand?

Thanks,
Quentin