linux-kernel - Re: [PATCHSET 00/18] perf tools: Add support for hierachy view (v7)

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Date:	Thu, 25 Feb 2016 11:14:31 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Wang Nan <wangnan0@...wei.com>,
	Don Zickus <dzickus@...hat.com>,
	Pekka Enberg <penberg@...nel.org>,
	Moinuddin Quadri <moin18@...il.com>
Subject: Re: [PATCHSET 00/18] perf tools: Add support for hierachy view (v7)

On Wed, Feb 24, 2016 at 08:29:32PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Feb 25, 2016 at 12:13:32AM +0900, Namhyung Kim escreveu:
> > Hello,
> > 
> > This patchset implements a new feature that collects hist entries in a
> > hierachical manner.  That means lower-level entries belong to an
> > upper-level entry.  The entry hierachy is built on the sort keys
> > given, so users can set it whatever they want.  It only shows
> > top-level entries first, and user can expand/collapse it dynamically.
> > 
> >  * Changes from v6)
> >   - pass srcline, srcfile and trace_output of hist entry properly  (Jiri)
> >   - use hist_entry__snprintf_alignment()  (Jiri)
> 
> Suggestion for further improvement:
> 
> perf top --hierarchy -e sched:sched_switch -s prev_comm,prev_pid,next_comm,next_pid
> 
> Will have four levels, would be nice to have just two, perhaps expressed
> via:
> 
> perf top --hierarchy -e sched:sched_switch -s prev_comm+prev_pid,next_comm+next_pid
> 
> Where '+' would work as sort order separator, just like ',' but would
> have special meaning for --hierarchy.
> 
> What do you think?

Looks like a good addition.  To do that, a hist entry has to have its
own perf_hpp_list instead of a single perf_hpp_fmt.  I'll try to
implement it..

Thanks,
Namhyung