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From: Ingo Molnar <mingo@kernel.org>
To: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Borislav Petkov <bp@suse.de>,
	Chandler Carruth <chandlerc@gmail.com>,
	David Ahern <dsahern@gmail.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Stephane Eranian <eranian@google.com>,
	Wang Nan <wangnan0@huawei.com>
Subject: Re: [PATCH 13/16] perf callchain: Switch default to 'graph,0.5,caller'
Date: Wed, 21 Oct 2015 10:06:45 +0200	[thread overview]
Message-ID: <20151021080645.GA9318@gmail.com> (raw)
In-Reply-To: <20151020120033.GB5119@kernel.org>


* Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com> wrote:

> Indeed, finding a default that is deemed adequate for most people is, ho-hum, 
> difficult 8-)
> 
> Ingo, what do you think?

So I think the new default is a lot more intuitive, because it starts with a high 
level top-down 'overview' kind of output, allowing one to drill down to the 
details.

That's what most other tools do as well by default, and people migrating to perf 
found it pretty confusing that we do a bottom-up kind of callgraph.

To people using perf for the first time it does not matter nearly as much, but 
intuitiveness is still a factor.

The new default requires good call-chains and good symbol resolution to be 
maximally effective, but we want perfect callchains and symbols in any case, 
right?

Thanks,

	Ingo

  parent reply	other threads:[~2015-10-21  8:06 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-05 21:03 [GIT PULL 00/16] perf/core improvements and fixes Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 01/16] tools lib api fs: No need to use PATH_MAX + 1 Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 02/16] perf evlist: Display DATA_SRC sample type bit Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 03/16] perf annotate: Fix sizeof_sym_hist overflow issue Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 04/16] perf tools: Export perf_event_attr__set_max_precise_ip() Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 05/16] perf tools: Introduce 'P' modifier to request max precision Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 06/16] perf tests: Add parsing test for 'P' modifier Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 07/16] perf tools: Add support for sorting on the iaddr Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 08/16] perf tools: Setup proper width for symbol_iaddr field Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 09/16] perf tools: Handle -h and -v options Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 10/16] perf tests: Add arch tests Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 11/16] perf tests: Move x86 tests into arch directory Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 12/16] perf tests: Add Intel CQM test Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 13/16] perf callchain: Switch default to 'graph,0.5,caller' Arnaldo Carvalho de Melo
2015-10-09 20:34   ` Brendan Gregg
2015-10-09 21:56     ` Arnaldo Carvalho de Melo
2015-10-09 22:10       ` Brendan Gregg
2015-10-09 22:25         ` Arnaldo Carvalho de Melo
2015-10-20  0:16           ` Brendan Gregg
2015-10-20 12:00             ` Arnaldo Carvalho de Melo
2015-10-20 12:19               ` Frederic Weisbecker
2015-10-20 13:06                 ` Arnaldo Carvalho de Melo
2015-10-20 17:21                   ` Frederic Weisbecker
2015-10-20 18:44                     ` Arnaldo Carvalho de Melo
2015-10-21  1:21                       ` Namhyung Kim
2015-10-21 13:24                         ` Arnaldo Carvalho de Melo
2015-10-21  8:09                     ` Namhyung Kim
2015-10-21 11:57                       ` Wangnan (F)
2015-10-21 16:35                       ` Frederic Weisbecker
     [not found]                   ` <CAAwGriEtYeBytGt9x24=uUqSEy5oJ2HigfA2KXnKyrAioKrtNg@mail.gmail.com>
2015-10-21 16:27                     ` Frederic Weisbecker
2015-10-21 18:28                     ` Brendan Gregg
2015-10-21 19:23                       ` Arnaldo Carvalho de Melo
2015-10-22  0:44                         ` Brendan Gregg
2015-10-21  8:06               ` Ingo Molnar [this message]
2015-10-21 13:21                 ` Arnaldo Carvalho de Melo
2015-10-21 19:18                 ` Brendan Gregg
2015-10-10  7:09         ` Ingo Molnar
2015-10-10  7:34           ` Brendan Gregg
2015-10-10  9:07             ` Ingo Molnar
2015-10-12 15:27   ` Frederic Weisbecker
2015-10-13  4:26   ` Namhyung Kim
2015-10-19 23:50     ` Brendan Gregg
2015-10-21  7:29       ` Namhyung Kim
2015-10-20 13:23   ` Wangnan (F)
2015-10-20 13:38     ` Arnaldo Carvalho de Melo
2015-10-21  1:44       ` Namhyung Kim
2015-10-21  8:48       ` Ingo Molnar
2015-10-21 13:43         ` Arnaldo Carvalho de Melo
2015-10-21 13:46           ` Arnaldo Carvalho de Melo
2015-10-22  8:46           ` Ingo Molnar
2015-10-22 12:36             ` Namhyung Kim
2015-10-05 21:03 ` [PATCH 14/16] perf ui browser: Optional horizontal scrolling key binding Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 15/16] perf hists browser: Implement horizontal scrolling Arnaldo Carvalho de Melo
2015-10-05 21:03 ` [PATCH 16/16] perf tools: Fail properly in case pattern matching fails to find tracepoint Arnaldo Carvalho de Melo
2015-10-06  7:09 ` [GIT PULL 00/16] perf/core improvements and fixes Ingo Molnar

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