linux-kernel - Re: [RFC/PATCH] perf report: Show random usage tip on the help line

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Date:	Tue, 5 Jan 2016 22:51:26 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Wangnan (F)" <wangnan0@...wei.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [RFC/PATCH] perf report: Show random usage tip on the help line

Em Wed, Jan 06, 2016 at 08:37:53AM +0900, Namhyung Kim escreveu:
> On Tue, Jan 05, 2016 at 09:52:46PM +0100, Andi Kleen wrote:
> > > Btw, does anyone have some tips to add? :)

> > Use perf script to show individual samples
> > Use perf report --percent-limit 5 to only show entires above 5%
> > Use perf record -b -g / perf report --branch-history to show branch events
> > Use perf record -b / perf report to show branch mispredictions
> > Use perf report -M intel to show Intel style assembler 
> > Use perf report --sort srcfile to sort by source file
> > Use perf report --sort symbol,srcline to sort by source line
> > Use perf record -e '{cycles,cache-misses}:S' / perf report --group to associate events
 
> We should enable --group by default if recorded data file has groups IMHO.
 
> Arnaldo, could you please take this?
 
>   https://lkml.org/lkml/2015/11/29/76

Sure, I thought I had merged that already, even noticed that yesterday,
when testing some stuff... Will do tomorrow.
 
> > Use perf mem record / perf mem report for memory address profiling
> > Use perf stat -I 1000 to count events in intervals
> > Use perf stat -I 1000 -x, to count events and output as CSV
> > Use perf timechart record / report to generate high level time line
> > Use perf probe --add kfunc / perf record -e kfunc to trace a custom trace point
 
> Thanks for sharing!
 
> > You may also want to adapt some of Brendan's one liners:

> > http://www.brendangregg.com/perf.html

> Will take a look.

Yeah, that is another source, maybe Brendan can put those together in a
brendan.tips.txt that we could put in the /usr/lib/perf/tips/ directory?
;-) :-)

- Arnaldo
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