linux-kernel - Re: [PATCH 08/16] perf tools: Increase debug level of SDT debug messages

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Message-ID: <eb9902fe-d9a4-af00-c8a1-8c1cfbd2cb62@intel.com>
Date:   Mon, 26 Sep 2016 10:27:41 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/16] perf tools: Increase debug level of SDT debug
 messages

On 24/09/16 03:15, Masami Hiramatsu wrote:
> On Fri, 23 Sep 2016 17:38:40 +0300
> Adrian Hunter <adrian.hunter@...el.com> wrote:
> 
>> Two SDT debug messages can occur for every DSO which is too noisy.
>> Consequently, increase debug level of SDT messages.
> 
> OK, but why "4" would you choose?

2 is used for displaying the event attributes, so it needs to be 3 or 4.  I
chose 4 because of the large number of messages and that the same messages
appear every time.

> 
> Thanks,
> 
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
>> ---
>>  tools/perf/util/build-id.c   | 4 ++--
>>  tools/perf/util/probe-file.c | 2 +-
>>  2 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
>> index 5651f3c12f93..e528c40739cc 100644
>> --- a/tools/perf/util/build-id.c
>> +++ b/tools/perf/util/build-id.c
>> @@ -620,7 +620,7 @@ static int build_id_cache__add_sdt_cache(const char *sbuild_id,
>>  
>>  	ret = probe_cache__scan_sdt(cache, realname);
>>  	if (ret >= 0) {
>> -		pr_debug("Found %d SDTs in %s\n", ret, realname);
>> +		pr_debug4("Found %d SDTs in %s\n", ret, realname);
>>  		if (probe_cache__commit(cache) < 0)
>>  			ret = -1;
>>  	}
>> @@ -691,7 +691,7 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
>>  
>>  	/* Update SDT cache : error is just warned */
>>  	if (build_id_cache__add_sdt_cache(sbuild_id, realname) < 0)
>> -		pr_debug("Failed to update/scan SDT cache for %s\n", realname);
>> +		pr_debug4("Failed to update/scan SDT cache for %s\n", realname);
>>  
>>  out_free:
>>  	if (!is_kallsyms)
>> diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
>> index 6f931e442f14..436b64731f65 100644
>> --- a/tools/perf/util/probe-file.c
>> +++ b/tools/perf/util/probe-file.c
>> @@ -699,7 +699,7 @@ int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname)
>>  	INIT_LIST_HEAD(&sdtlist);
>>  	ret = get_sdt_note_list(&sdtlist, pathname);
>>  	if (ret < 0) {
>> -		pr_debug("Failed to get sdt note: %d\n", ret);
>> +		pr_debug4("Failed to get sdt note: %d\n", ret);
>>  		return ret;
>>  	}
>>  	list_for_each_entry(note, &sdtlist, note_list) {
>> -- 
>> 1.9.1
>>
> 
>