linux-kernel - Re: [PATCH 1/6] perf mem: Add --ldlat option

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Date:	Thu, 7 Apr 2016 15:58:52 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/6] perf mem: Add --ldlat option

On Sat, Mar 26, 2016 at 05:06:38PM +0100, Jiri Olsa wrote:
> On Thu, Mar 24, 2016 at 12:57:58PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Mar 24, 2016 at 01:52:15PM +0100, Jiri Olsa escreveu:
> > > Adding --ldlat option to specify desired latency
> > > for loads event.
> > > 
> > > Specify 50 as loads event latency:
> > > 
> > >   $ perf mem record -e ldlat-loads -v --ldlat 50 true
> > >   calling: record -W -d -e cpu/mem-loads,ldlat=50/P true
> > 
> > We have all this infrastructure to set per-event settings, on the
> > command line, and here we end up adding a separate command line option
> > to do that? Why not something like:
> > 
> > 	perf mem record -e ldlat-loads/lat=50/ true
> 
> will check ;-)

sry for delay..

the thing is, that we can already do that via record command:
  perf record -e "cpu/mem-loads,ldlat=30/" ls

but this option is in perf mem command, which provides
the way to use short config:
   $ perf mem record --ldlat 50 ls

and adds also '-W -d' options for record command:

  $ ./perf mem record -v --ldlat 50 ls 
  calling: record -W -d -e cpu/mem-loads,ldlat=50/P ls 

jirka