linux-kernel - Re: [PATCH 1/4] perf trace-event-info: Add tracepoint_id_to

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Date:   Wed, 10 May 2023 16:09:37 +0800
From:   Yang Jihong <yangjihong1@...wei.com>
To:     Adrian Hunter <adrian.hunter@...el.com>, <peterz@...radead.org>,
        <mingo@...hat.com>, <acme@...nel.org>, <mark.rutland@....com>,
        <alexander.shishkin@...ux.intel.com>, <jolsa@...nel.org>,
        <namhyung@...nel.org>, <irogers@...gle.com>,
        <anshuman.khandual@....com>, <jesussanp@...gle.com>,
        <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] perf trace-event-info: Add tracepoint_id_to_name()
 helper

Hello,

On 2023/5/10 15:48, Adrian Hunter wrote:
> On 19/04/23 15:29, Yang Jihong wrote:
>> Add tracepoint_id_to_name() helper to search for the trace events directory
>> by given event id and return the corresponding tracepoint.
>>
>> Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
>> ---
>>   tools/perf/util/trace-event-info.c | 13 +++++++++++++
>>   tools/perf/util/trace-event.h      |  6 ++++++
>>   2 files changed, 19 insertions(+)
>>
>> diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
>> index c24b3a15e319..79907caaf0ca 100644
>> --- a/tools/perf/util/trace-event-info.c
>> +++ b/tools/perf/util/trace-event-info.c
>> @@ -466,6 +466,19 @@ static struct tracepoint_path *tracepoint_id_to_path(u64 config)
>>   	return NULL;
>>   }
>>   
>> +char *tracepoint_id_to_name(u64 config)
>> +{
>> +	char buf[MAX_EVENT_LENGTH];
>> +	struct tracepoint_path *path = NULL;
> 
> Initializer should be tracepoint_id_to_path(config) i.e.
> 
OK, will fix in next version.

> 	struct tracepoint_path *path = tracepoint_id_to_path(config);
> 
>> +
>> +	path = tracepoint_id_to_path(config);
>> +	if (path == NULL)
>> +		return NULL;
>> +
>> +	snprintf(buf, sizeof(buf), "%s:%s", path->system, path->name);
> 
> asprintf() can be used then buf and strdup() are not needed.
> 
OK, will fix in next version.

Thanks for correcting.

Thanks,
Yang