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

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Date:	Wed, 24 Feb 2016 22:22:07 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	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>,
	Andi Kleen <andi@...stfloor.org>,
	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: [PATCHSET 00/18] perf tools: Add support for hierachy view (v7)

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@...et 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@...et linux]$