Re: [PATCH v3 perf,bpf 05/11] perf, bpf: save bpf_prog_info in a rbtree in perf_env

[Song Liu]

> On Feb 17, 2019, at 3:05 PM, Jiri Olsa <jolsa@xxxxxxxxxx> wrote:
> 
> On Fri, Feb 15, 2019 at 01:53:48PM -0800, Song Liu wrote:
> 
> SNIP
> 
>> 	info_linear = bpf_program__get_prog_info_linear(fd, arrays);
>> 	if (IS_ERR_OR_NULL(info_linear)) {
>> @@ -151,8 +165,8 @@ static int perf_event__synthesize_one_bpf_prog(struct perf_tool *tool,
>> 						     machine, process);
>> 	}
>> 
>> -	/* Synthesize PERF_RECORD_BPF_EVENT */
>> 	if (opts->bpf_event) {
>> +		/* Synthesize PERF_RECORD_BPF_EVENT */
>> 		*bpf_event = (struct bpf_event){
>> 			.header = {
>> 				.type = PERF_RECORD_BPF_EVENT,
>> @@ -165,6 +179,19 @@ static int perf_event__synthesize_one_bpf_prog(struct perf_tool *tool,
>> 		memcpy(bpf_event->tag, info->tag, BPF_TAG_SIZE);
>> 		memset((void *)event + event->header.size, 0, machine->id_hdr_size);
>> 		event->header.size += machine->id_hdr_size;
>> +
>> +		/* save bpf_prog_info to env */
>> +		info_node = malloc(sizeof(struct bpf_prog_info_node));
>> +		if (info_node) {
>> +			info_node->info_linear = info_linear;
>> +			perf_env__insert_bpf_prog_info(env, info_node);
>> +			info_linear = NULL;
>> +		}
> 
> what if the allocation fails? we don't care?
> 
> jirka

My original plan is to just ignore it and accept that this program
doesn't have annotation. Any suggestion on what would be a better 
approach?

Thanks,
Song