linux-kernel - Re: [PATCHv4 00/27] perf stat: Introduce --per-thread option

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Date:	Tue, 23 Jun 2015 17:08:07 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>
CC:	Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	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>
Subject: Re: [PATCHv4 00/27] perf stat: Introduce --per-thread option

On 23/06/15 17:05, Arnaldo Carvalho de Melo wrote:
> Em Tue, Jun 23, 2015 at 09:22:00AM +0200, Jiri Olsa escreveu:
>> On Mon, Jun 22, 2015 at 08:06:00PM -0300, Arnaldo Carvalho de Melo wrote:
>>> Em Tue, Jun 23, 2015 at 12:36:01AM +0200, Jiri Olsa escreveu:
>>>> adding the possibility to display stat data per thread.
> 
>>>> Allowing following commands and output:
> 
>>>>   $ perf stat  -e cycles,instructions --per-thread -p 30190,30242
> 
>>> While testing Adrian's Intel PT patchkit I realised we have --per-thread
>>> in 'record', wonder if using a long option with the exact same name but
>>> different meanings for 'stat' and 'record'  would cause confusion...
>  
>> I think the name fits for both stat and record.. and both are doing different
> 
> For record it is vague, for stat, it seems to fit.
> 
> For record it really should be --mmap-per-thread, but then we start
> getting what may seem overly long options, but then, its an oddball
> 'record' option...

It is not just the mmap, it is also the perf context. So it is central to
the way perf works.

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