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

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

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?