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

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Date:	Tue, 08 Apr 2014 16:37:12 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Don Zickus <dzickus@...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

Hi Jiri,

On Sun, 6 Apr 2014 15:14:22 +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:
>> > On Mon, Mar 24, 2014 at 03:36:57PM -0400, Don Zickus wrote:
>> > > Modified the code to allow latency settings to be tweaked on the command line
>> > > and also the ability to dynamically profile stores (or disable using stores).
>> > > 
>> > > This allows the tool to be used on older Intel platforms like Westmere.
>> > > 
>> > > Signed-off-by: Don Zickus <dzickus@...hat.com>
>> > > ---
>> > 
>> > SNIP
>> > 
>> > > @@ -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.. 

Why?  I think the -a option behavior is orthogonal to the user/kernel
modifier behavior, no?  Do the mem-loads/stores events have any
restriction on 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

Agreed.

Thanks,
Namhyung
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