linux-kernel - Re: [PATCH 5/6] perf tools: Add dynamic sort key for tracepoint events

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Date:	Tue, 15 Dec 2015 21:07:03 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 5/6] perf tools: Add dynamic sort key for tracepoint
 events

On Tue, Dec 15, 2015 at 09:53:09AM +0100, Jiri Olsa wrote:
> On Tue, Dec 15, 2015 at 12:46:12AM +0900, Namhyung Kim wrote:
> 
> SNIP
> 
> > 
> >   $ perf report -s comm,sched:sched_switch.next_pid,sched:sched_switch.next_comm --stdio
> >   ...
> >   # Overhead  Command            next_pid         next_comm
> >   # ........  ...............  ..........  ................
> >   #
> >       20.86%  swapper               17773   transmission-gt
> >        9.64%  transmission-gt           0         swapper/0
> >        9.16%  transmission-gt           0         swapper/2
> >        5.25%  swapper                 109      kworker/0:1H
> >        5.21%  kworker/0:1H              0         swapper/0
> >        2.14%  netctl-auto               0         swapper/2
> >        1.98%  netctl-auto               0         swapper/0
> >        1.98%  swapper                6524            Xephyr
> >        1.98%  swapper               27478       netctl-auto
> >        1.78%  transmission-gt           0         swapper/3
> >        1.53%  Xephyr                    0         swapper/0
> >        1.29%  netctl-auto               0         swapper/1
> >        1.29%  swapper               27476       netctl-auto
> >        1.21%  netctl-auto               0         swapper/3
> >        1.17%  swapper                 233    irq/33-iwlwifi
> > 
> > Note that pid 0 exists for each cpu so have comm of 'swapper/N'.
> 
> could we also add by default all tracepoint fields in case none
> is specified and the event to display is tracepoint?

Seems like a good suggestion.  We can check if there's only one
tracepoint event, then use dynamic sort keys for all fields.  But I
think we should skip common fields in that case.

> 
> also an extra field that would hold/show the 'print fmt' display ? 

Do you want a single extra field per event or per field?

Thanks,
Namhyung
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