Re: [PATCHSET 00/18] perf tools: Add support for hierachy view (v7)

[Arnaldo Carvalho de Melo]

Em Thu, Feb 25, 2016 at 12:13:32AM +0900, Namhyung Kim escreveu:
> Hello,
> 
> This patchset implements a new feature that collects hist entries in a
> hierachical manner.  That means lower-level entries belong to an
> upper-level entry.  The entry hierachy is built on the sort keys
> given, so users can set it whatever they want.  It only shows
> top-level entries first, and user can expand/collapse it dynamically.

Some oddity: look at the line with 3.92%, it shows just the DSO... Ok, there
probably are no symbols above the specified threshold (--percent-limit 1), but
it is strange none the less, perhaps we can add something like:

#       Overhead  Command / Shared Object / Symbol      
# ..............  ..............................................................................................................................................
#
    72.83%        cc1       
       60.88%        cc1                    
           1.92%        [.] bitmap_set_bit
        7.37%        libc-2.22.so           
           2.90%        [.] _int_malloc
            |          
             --2.04%--0
                       _int_malloc

           1.13%        [.] _int_free
        3.92%        [kernel.vmlinux]       
           (no symbols >= 1%)


Original output:


[acme@jouet linux]$ perf report --hierarchy --percent-limit 1 | head -30
no symbols found in /usr/bin/gcc, maybe install a debug package?
# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 10K of event 'cycles:ppp'
# Event count (approx.): 6703622666
#
#       Overhead  Command / Shared Object / Symbol      
# ..............  ..............................................................................................................................................
#
    72.83%        cc1       
       60.88%        cc1                    
           1.92%        [.] bitmap_set_bit
        7.37%        libc-2.22.so           
           2.90%        [.] _int_malloc
            |          
             --2.04%--0
                       _int_malloc

           1.13%        [.] _int_free
        3.92%        [kernel.vmlinux]       
     5.96%        as        
        3.19%        [kernel.vmlinux]       
        1.31%        as                     
     5.33%        conf      
        2.39%        conf                   
        1.52%        libc-2.22.so           
        1.37%        [kernel.vmlinux]       
     4.88%        ld        
[acme@jouet linux]$