linux-kernel - Re: [RFC/PATCHSET 00/15] perf report: Add support to accumulate hist periods

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Date:	Mon, 29 Oct 2012 20:08:47 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arun Sharma <asharma@...com>, David Ahern <dsahern@...il.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [RFC/PATCHSET 00/15] perf report: Add support to accumulate
 hist periods

On Thu, 2012-09-13 at 16:19 +0900, Namhyung Kim wrote:
> When --cumulate option is given, it'll be shown like this:
> 
>    $ perf report --cumulate
>    (...)
>    +  93.63%  abc  libc-2.15.so        [.] __libc_start_main
>    +  93.35%  abc  abc                 [.] main
>    +  93.35%  abc  abc                 [.] c
>    +  93.35%  abc  abc                 [.] b
>    +  93.35%  abc  abc                 [.] a
>    +   5.17%  abc  ld-2.15.so          [.] _dl_map_object
>    +   5.17%  abc  ld-2.15.so          [.] _dl_map_object_from_fd
>    +   1.13%  abc  ld-2.15.so          [.] _dl_start_user
>    +   1.13%  abc  ld-2.15.so          [.] _dl_start
>    +   0.29%  abc  perf                [.] main
>    +   0.29%  abc  perf                [.] run_builtin
>    +   0.29%  abc  perf                [.] cmd_record
>    +   0.29%  abc  libpthread-2.15.so  [.] __libc_close
>    +   0.07%  abc  ld-2.15.so          [.] _start
>    +   0.07%  abc  [kernel.kallsyms]   [k] page_fault
>    
> (This output came from TUI since stdio bothered by callchains) 

Right, so I tried this and I would expect the callchains to be inverted
too, so that when I expand say 'c' I would see that 'c' calls 'b' for
100% which calls 'a' for 100%.

Instead I get the regular callchains, expanding 'c' gives me main calls
it for 100%.

Adding -G (invert callchains) doesn't make it better, in that case, when
I expand 'c' we start at '__libc_start_main' instead of 'c'.

Is there anything I'm missing?
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