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

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Date:	Tue, 19 Jan 2016 18:07:25 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Andi Kleen <andi@...stfloor.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)

Em Tue, Jan 19, 2016 at 06:03:39PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Jan 19, 2016 at 07:45:06PM +0900, Namhyung Kim escreveu:
> > On Sun, Jan 17, 2016 at 08:31:53PM +0100, Andi Kleen wrote:
> > > 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?

> Yeah, please elaborate, I'm testing:

> perf top -s comm,dso,sym --hierarchy --percent-limit 0.5
> 
> And it seems to work...

For instance, running that top command above, then expanding some of the
callchains and pressing 'P' to generate a perf.hist.0 output file, all
obey the 0.5 threshold for discading entries with less than that
percentage, what is the problem you're noticing? Is it only in stdio or
what?

-  76.76%            cc1
   -  62.43%            cc1
          2.82%            [.] _cpp_lex_token
          1.59%            [.] ht_lookup_with_hash
          1.23%            [.] ggc_internal_alloc
          0.85%            [.] bitmap_set_bit
          0.53%            [.] cpp_get_token_with_location
          0.51%            [.] ht_lookup
   -   7.77%            libc-2.22.so
          2.06%            [.] _int_malloc
          0.84%            [.] _int_free
          0.57%            [.] _IO_putc
          0.55%            [.] malloc_consolidate
   -   5.86%            [kernel]
-   9.38%            as
   +   6.03%            as
   +   1.39%            [kernel]
   +   1.28%            libc-2.22.so
-   3.41%            gcc
   +   1.63%            [kernel]
   +   0.64%            [unknown]
   -   0.52%            ccache
+   2.28%            ld
+   1.85%            perf
+   1.45%            sh
+   1.16%            perl
+   0.55%            make