linux-kernel - Re: [PATCH 06/15 V3] perf, c2c: Add in new options to configure latency and stores

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Date:	Wed, 09 Apr 2014 09:17:04 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, acme@...stprotocols.net,
	LKML <linux-kernel@...r.kernel.org>, jmario@...hat.com,
	fowles@...each.com, peterz@...radead.org, eranian@...gle.com,
	andi.kleen@...el.com
Subject: Re: [PATCH 06/15 V3] perf, c2c: Add in new options to configure latency and stores

On Mon, 7 Apr 2014 14:16:18 -0400, Don Zickus wrote:
> On Sun, Apr 06, 2014 at 03:14:22PM +0200, Jiri Olsa wrote:
>> On Mon, Mar 31, 2014 at 10:55:35PM -0400, Don Zickus wrote:
>> > On Sat, Mar 29, 2014 at 06:11:38PM +0100, Jiri Olsa wrote:
>> > > > @@ -316,6 +369,12 @@ int cmd_c2c(int argc, const char **argv, const char *prefix __maybe_unused)
>> > > >  	};
>> > > >  	const struct option c2c_options[] = {
>> > > >  	OPT_BOOLEAN('r', "raw_records", &c2c.raw_records, "dump raw events"),
>> > > > +	OPT_INTEGER('l', "latency-level", &lat_level,
>> > > > +		 "specify the latency threshold for loads [default=30]"),
>> > > > +	OPT_INTEGER('p', "precision-level", &prec_level,
>> > > > +		 "specify the precision level of events (0,1,2,3) [default=1]"),
>> > > 
>> > > could we get also option for user space modifier?
>> > 
>> > You mean the 'u' modifier, ie cpu/mem-loads/u ?  If so, then I can do that
>> > but will that work with the -a option (which is hardcoded in the c2c
>> > tool [system-wide mode])?
>> 
>> right, forgot about that.. could the -a option be optional as well?
>> probably the same way as for record would be the best:
>> 
>>   perf c2c record ./foo       # workload specific
>>   perf c2c record -a sleep 3  # system wide
>
> I understand what you are saying, but our tool was written to find cache
> contention across the system, so -a is usually implied.  Most of our
> profiling is done system-wide.

Hmm.. any chance it can be used for non-system-wide analysis?  I think
tool should provide a way to do it if it's a valid usecase.  And adding
-a option when recording doesn't look too hard. :)


> I would rather implement the opposite option --no-system-wide, if that
> is ok.

Please just add -a/--system-wide (maybe use can make it default if no
argument/workload is given like perf top does) then tool will provide
the --no-* option automatically.

Thanks,
Namhyung
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