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

From: Namhyung Kim <namhyung@kernel.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: "Wangnan (F)" <wangnan0@huawei.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Jiri Olsa <jolsa@redhat.com>, LKML <linux-kernel@vger.kernel.org>,
	David Ahern <dsahern@gmail.com>,
	Stephane Eranian <eranian@google.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Subject: Re: [RFC/PATCH] perf report: Show random usage tip on the help line
Date: Wed, 6 Jan 2016 08:37:53 +0900	[thread overview]
Message-ID: <20160105233753.GB18895@sejong> (raw)
In-Reply-To: <20160105205246.GJ15533@two.firstfloor.org>

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

> 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.

Thanks,
Namhyung