linux-kernel - Re: [PATCH v6 1/2] perf: support multiple debug options separated by ','

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Date:   Tue, 26 Nov 2019 22:34:04 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Changbin Du <changbin.du@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/2] perf: support multiple debug options separated by
 ','

On Tue, Nov 26, 2019 at 10:45:08AM +0100, Jiri Olsa wrote:
> On Mon, Nov 25, 2019 at 11:14:45PM +0800, Changbin Du wrote:
> > This patch adds support for multiple debug options separated by ',' and
> > non-int values.
> > 	--debug verbose=2,stderr
> > 
> > Signed-off-by: Changbin Du <changbin.du@...il.com>
> > ---
> >  tools/perf/Documentation/perf.txt | 13 +++--
> >  tools/perf/util/debug.c           | 89 ++++++++++++++++---------------
> >  2 files changed, 53 insertions(+), 49 deletions(-)
> > 
> > diff --git a/tools/perf/Documentation/perf.txt b/tools/perf/Documentation/perf.txt
> > index 3f37ded13f8c..fd8d790f68a7 100644
> > --- a/tools/perf/Documentation/perf.txt
> > +++ b/tools/perf/Documentation/perf.txt
> > @@ -19,13 +19,12 @@ OPTIONS
> >  	  --debug verbose=2 # sets verbose = 2
> >  
> >  	List of debug variables allowed to set:
> > -	  verbose          - general debug messages
> > -	  ordered-events   - ordered events object debug messages
> > -	  data-convert     - data convert command debug messages
> > -	  stderr           - write debug output (option -v) to stderr
> > -	                     in browser mode
> > -	  perf-event-open  - Print perf_event_open() arguments and
> > -			     return value
> > +	  verbose=level		- general debug messages
> > +	  ordered-events=level	- ordered events object debug messages
> > +	  data-convert=level	- data convert command debug messages
> > +	  stderr		- write debug output (option -v) to stderr
> > +	  perf-event-open	- Print perf_event_open() arguments and
> > +	                          return value in browser mode
> 
> it's just the list and the doc says user can use values
> there, so no need for the '=level' there
> 
> also we allow this:
>   perf --debug stderr=9 record ls
> 
> so I thinks we should keep it general in documentation,
> eventhough it will always mean just stderr=true for any
> value
>
I changed them as below. For stderr and perf_event_open, the value is ignored
even it is given.

--debug::
	Setup debug variable (see list below). The range of 'level' value
	is (0, 10). Use like:
	  --debug verbose   # sets verbose = 1
	  --debug verbose=2,file=~/perf.log
	                    # sets verbose = 2 and save log to file

	List of debug variables allowed to set:
	  verbose[=level]	- general debug messages
	  ordered-events[=level]- ordered events object debug messages
	  data-convert[=level]	- data convert command debug messages
	  stderr		- write debug output (option -v) to stderr
	                          in browser mode
	  perf-event-open	- Print perf_event_open() arguments and
	                          return value

> jirka
> 

-- 
Cheers,
Changbin Du