netdev - Re: [PATCH v5 perf,bpf 13/15] perf, bpf: process PERF_BPF_EVENT_PROG

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Message-ID: <20190304135315.GI19809@krava>
Date:   Mon, 4 Mar 2019 14:53:15 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     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
Subject: Re: [PATCH v5 perf,bpf 13/15] perf, bpf: process
 PERF_BPF_EVENT_PROG_LOAD for annotation

On Wed, Feb 27, 2019 at 09:06:41PM -0800, Song Liu wrote:
> This patch adds processing of PERF_BPF_EVENT_PROG_LOAD, which sets proper
> DSO type/id/etc of memory regions mapped to BPF programs to
> DSO_BINARY_TYPE__BPF_PROG_INFO
> 
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  tools/perf/util/bpf-event.c | 53 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 53 insertions(+)
> 
> diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
> index 370b830f2433..048ef00371ad 100644
> --- a/tools/perf/util/bpf-event.c
> +++ b/tools/perf/util/bpf-event.c
> @@ -25,12 +25,65 @@ static int snprintf_hex(char *buf, size_t size, unsigned char *data, size_t len)
>  	return ret;
>  }
>  
> +static int machine__process_bpf_event_load(struct machine *machine __maybe_unused,

machine is used 

jirka

> +					   union perf_event *event,
> +					   struct perf_sample *sample __maybe_unused)
> +{
> +	struct bpf_prog_info_linear *info_linear;
> +	struct bpf_prog_info_node *info_node;
> +	struct perf_env *env = machine->env;
> +	int id = event->bpf_event.id;
> +	unsigned int i;
> +
> +	/* perf-record, no need to handle bpf-event */
> +	if (env == NULL)
> +		return 0;
> +
> +	info_node = perf_env__find_bpf_prog_info(env, id);
> +	if (!info_node)
> +		return 0;
> +	info_linear = info_node->info_linear;
> +
> +	for (i = 0; i < info_linear->info.nr_jited_ksyms; i++) {
> +		u64 *addrs = (u64 *)(info_linear->info.jited_ksyms);
> +		u64 addr = addrs[i];
> +		struct map *map;
> +
> +		map = map_groups__find(&machine->kmaps, addr);
> +
> +		if (map) {
> +			map->dso->binary_type = DSO_BINARY_TYPE__BPF_PROG_INFO;
> +			map->dso->bpf_prog.id = id;
> +			map->dso->bpf_prog.sub_id = i;
> +			map->dso->bpf_prog.env = env;
> +		}
> +	}
> +	return 0;
> +}
> +
>  int machine__process_bpf_event(struct machine *machine __maybe_unused,
>  			       union perf_event *event,
>  			       struct perf_sample *sample __maybe_unused)
>  {
>  	if (dump_trace)
>  		perf_event__fprintf_bpf_event(event, stdout);
> +
> +	switch (event->bpf_event.type) {
> +	case PERF_BPF_EVENT_PROG_LOAD:
> +		return machine__process_bpf_event_load(machine, event, sample);
> +
> +	case PERF_BPF_EVENT_PROG_UNLOAD:
> +		/*
> +		 * Do not free bpf_prog_info and btf of the program here,
> +		 * as annotation still need them. They will be freed at
> +		 * the end of the session.
> +		 */
> +		break;
> +	default:
> +		pr_debug("unexpected bpf_event type of %d\n",
> +			 event->bpf_event.type);
> +		break;
> +	}
>  	return 0;
>  }
>  
> -- 
> 2.17.1
>