linux-kernel - Re: [RFC/PATCHSET 00/17] perf tools: Add support for hierachy view (v2)

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Date:	Tue, 19 Jan 2016 23:12:04 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	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>,
	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: [RFC/PATCHSET 00/17] perf tools: Add support for hierachy view
 (v2)

> > Now we only need a better percent-limit that handles all
> > leaves correctly...
> 
> Hmm.. could you tell me where the percent-limit doesn't work
> correctly?

It doesn't work well together with call chains.

It only considers the hits on the leaf function, but doesn't hide
the individual call chains leading to that function which are below
the limit.

So if you have a lot of different cold callers you still end up
with far too much output.

Also would be nice to be able to set it dynamically from the UI.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.