linux-kernel - Re: [PATCH v3 perf,bpf 10/11] perf, bpf: enable annotation of bpf program

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Date:   Mon, 18 Feb 2019 00:06:46 +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 v3 perf,bpf 10/11] perf, bpf: enable annotation of bpf
 program

On Fri, Feb 15, 2019 at 01:53:53PM -0800, Song Liu wrote:

SNIP

> diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
> index 52507435c464..6c363adc781a 100644
> --- a/tools/perf/util/bpf-event.c
> +++ b/tools/perf/util/bpf-event.c
> @@ -25,12 +25,60 @@ static int snprintf_hex(char *buf, size_t size, unsigned char *data, size_t len)
>  	return ret;
>  }
>  

please move PERF_BPF_EVENT_PROG_LOAD/PERF_BPF_EVENT_PROG_UNLOAD
handling code below into separate patch from the bpf disassembly
code

thanks,
jirka

> +static int machine__process_bpf_event_load(struct machine *machine __maybe_unused,
> +					   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:
> +		break;
> +	default:
> +		pr_debug("unexpected bpf_event type of %d\n",
> +			 event->bpf_event.type);
> +		break;
> +	}
>  	return 0;
>  }
>  
> diff --git a/tools/perf/util/bpf-event.h b/tools/perf/util/bpf-event.h
> index b9ec394dc7c7..ab4a975b7e05 100644
> --- a/tools/perf/util/bpf-event.h
> +++ b/tools/perf/util/bpf-event.h
> @@ -2,6 +2,10 @@
>  #ifndef __PERF_BPF_EVENT_H
>  #define __PERF_BPF_EVENT_H
>  
> +#include <bpf/bpf.h>
> +#include <bpf/btf.h>
> +#include <bpf/libbpf.h>
> +#include <linux/btf.h>
>  #include <linux/compiler.h>
>  #include <linux/rbtree.h>
>  #include "event.h"
> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
> index 62c8cf622607..1798192bf0f9 100644
> --- a/tools/perf/util/dso.c
> +++ b/tools/perf/util/dso.c
> @@ -181,6 +181,7 @@ int dso__read_binary_type_filename(const struct dso *dso,
>  	case DSO_BINARY_TYPE__KALLSYMS:
>  	case DSO_BINARY_TYPE__GUEST_KALLSYMS:
>  	case DSO_BINARY_TYPE__JAVA_JIT:
> +	case DSO_BINARY_TYPE__BPF_PROG_INFO:
>  	case DSO_BINARY_TYPE__NOT_FOUND:
>  		ret = -1;
>  		break;
> diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
> index 8c8a7abe809d..f20d319463f1 100644
> --- a/tools/perf/util/dso.h
> +++ b/tools/perf/util/dso.h
> @@ -14,6 +14,8 @@
>  #include "namespaces.h"
>  #include "build-id.h"
>  
> +struct perf_env;
> +
>  enum dso_binary_type {
>  	DSO_BINARY_TYPE__KALLSYMS = 0,
>  	DSO_BINARY_TYPE__GUEST_KALLSYMS,
> @@ -34,6 +36,7 @@ enum dso_binary_type {
>  	DSO_BINARY_TYPE__KCORE,
>  	DSO_BINARY_TYPE__GUEST_KCORE,
>  	DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
> +	DSO_BINARY_TYPE__BPF_PROG_INFO,
>  	DSO_BINARY_TYPE__NOT_FOUND,
>  };
>  
> @@ -177,17 +180,25 @@ struct dso {
>  	struct auxtrace_cache *auxtrace_cache;
>  	int		 comp;
>  
> -	/* dso data file */
> -	struct {
> -		struct rb_root	 cache;
> -		int		 fd;
> -		int		 status;
> -		u32		 status_seen;
> -		size_t		 file_size;
> -		struct list_head open_entry;
> -		u64		 debug_frame_offset;
> -		u64		 eh_frame_hdr_offset;
> -	} data;
> +	union {
> +		/* dso data file */
> +		struct {
> +			struct rb_root	 cache;
> +			int		 fd;
> +			int		 status;
> +			u32		 status_seen;
> +			size_t		 file_size;
> +			struct list_head open_entry;
> +			u64		 debug_frame_offset;
> +			u64		 eh_frame_hdr_offset;
> +		} data;
> +		/* bpf prog information */
> +		struct {
> +			u32		id;
> +			u32		sub_id;
> +			struct perf_env	*env;
> +		} bpf_prog;
> +	};
>  
>  	union { /* Tool specific area */
>  		void	 *priv;
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index 48efad6d0f90..33ae59e89da2 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1441,6 +1441,7 @@ static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
>  	case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
>  		return true;
>  
> +	case DSO_BINARY_TYPE__BPF_PROG_INFO:
>  	case DSO_BINARY_TYPE__NOT_FOUND:
>  	default:
>  		return false;
> -- 
> 2.17.1
>