netdev - Re: [PATCH v2 perf,bpf 2/2] perf, bpf: show more BPF program info in print_bpf_prog

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Date:   Tue, 19 Mar 2019 14:40:54 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        kernel-team@...com, peterz@...radead.org, acme@...hat.com,
        jolsa@...nel.org, namhyung@...nel.org, sdf@...ichev.me
Subject: Re: [PATCH v2 perf,bpf 2/2] perf, bpf: show more BPF program info in
 print_bpf_prog_info()

Em Tue, Mar 19, 2019 at 09:54:54AM -0700, Song Liu escreveu:
> This patch enables showing bpf program name, address, and size in the
> header.
> 
> Before the patch:
> 
>   perf report --header-only
>   ...
>   # bpf_prog_info of id 9
>   # bpf_prog_info of id 10
>   # bpf_prog_info of id 13
> 
> After the patch:
> 
>   # bpf_prog_info 9: bpf_prog_7be49e3934a125ba addr 0xffffffffa0024947 size 229
>   # bpf_prog_info 10: bpf_prog_2a142ef67aaad174 addr 0xffffffffa007c94d size 229
>   # bpf_prog_info 13: bpf_prog_47368425825d7384_task__task_newt addr 0xffffffffa0251137 size 369
> index 8cb1189149ec..d9cb4170ae79 100644
> --- a/tools/perf/util/bpf-event.h
> +++ b/tools/perf/util/bpf-event.h
> @@ -38,7 +38,9 @@ int perf_event__synthesize_bpf_events(struct perf_session *session,
>  				      struct record_opts *opts);
>  int bpf_event__add_sb_event(struct perf_evlist **evlist,
>  				 struct perf_env *env);
> -
> +void bpf_event__print_bpf_prog_info(struct bpf_prog_info *info,
> +				    struct perf_env *env,
> +				    FILE *fp);
>  #else
>  static inline int machine__process_bpf_event(struct machine *machine __maybe_unused,
>  					     union perf_event *event __maybe_unused,
> @@ -61,5 +63,11 @@ static inline int bpf_event__add_sb_event(struct perf_evlist **evlist __maybe_un
>  	return 0;
>  }
>  
> +void bpf_event__print_bpf_prog_info(struct bpf_prog_info *info,

Missing static inline here, as well as the __maybe_unused, I'm fixing it

> +				    struct perf_env *env,
> +				    FILE *fp)
> +{
> +
> +}
>  #endif // HAVE_LIBBPF_SUPPORT
>  #endif
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 01dda2f65d36..b9e693825873 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -1468,8 +1468,9 @@ static void print_bpf_prog_info(struct feat_fd *ff, FILE *fp)
>  
>  		node = rb_entry(next, struct bpf_prog_info_node, rb_node);
>  		next = rb_next(&node->rb_node);
> -		fprintf(fp, "# bpf_prog_info of id %u\n",
> -			node->info_linear->info.id);
> +
> +		bpf_event__print_bpf_prog_info(&node->info_linear->info,
> +					       env, fp);
>  	}
>  
>  	up_read(&env->bpf_progs.lock);
> -- 
> 2.17.1

-- 

- Arnaldo