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

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Date:   Tue, 27 Sep 2016 10:42:12 -0700
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
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 Mon, 26 Sep 2016 10:27:41 +0300
Adrian Hunter <adrian.hunter@...el.com> wrote:

> 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.

Hmm, yes, but this message is also useful for checking user to
stack on retrieving SDT or not. I think it is a time to introduce
debug printk like feature to perf, because we need to control on/off
depending on which subcommand we are debugging.

Anyway, at this point it is OK for me.

Acked-by: Masami Hiramatsu <mhiramat@...nel.org>

> 
> > 
> > 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
> >>
> > 
> > 
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>