Re: [PATCH 07/11] perf, tools: Collapse identically named events in perf stat

From	Jiri Olsa <jolsa@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 07/11] perf, tools: Collapse identically named events in perf stat
Date	2017-01-18 13:50 +0100
Message-ID	<t0XQC-49m-9@gated-at.bofh.it> (permalink)
References	<sVySR-85Q-27@gated-at.bofh.it> <sVySS-85Q-43@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Tue, Jan 03, 2017 at 07:08:29AM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@linux.intel.com>
> 
> The uncore PMU has a lot of duplicated PMUs for different subsystems.
> When expanding an uncore alias we usually end up with a large
> number of identically named aliases, which makes perf stat
> output difficult to read.
> 
> Automatically sum them up in perf stat, unless --no-merge is specified.
> 
> This can be default because only the uncores generally have duplicated
> aliases. Other PMUs have unique names.
> 
> Before:
> 
> % perf stat --no-merge -a  -e unc_c_llc_lookup.any sleep 1
> 
>  Performance counter stats for 'system wide':
> 
>            694,976 Bytes unc_c_llc_lookup.any
>            706,304 Bytes unc_c_llc_lookup.any
>            956,608 Bytes unc_c_llc_lookup.any
>            782,720 Bytes unc_c_llc_lookup.any
>            605,696 Bytes unc_c_llc_lookup.any
>            442,816 Bytes unc_c_llc_lookup.any
>            659,328 Bytes unc_c_llc_lookup.any
>            509,312 Bytes unc_c_llc_lookup.any
>            263,936 Bytes unc_c_llc_lookup.any
>            592,448 Bytes unc_c_llc_lookup.any
>            672,448 Bytes unc_c_llc_lookup.any
>            608,640 Bytes unc_c_llc_lookup.any
>            641,024 Bytes unc_c_llc_lookup.any
>            856,896 Bytes unc_c_llc_lookup.any
>            808,832 Bytes unc_c_llc_lookup.any
>            684,864 Bytes unc_c_llc_lookup.any
>            710,464 Bytes unc_c_llc_lookup.any
>            538,304 Bytes unc_c_llc_lookup.any
> 
>        1.002577660 seconds time elapsed
> 
> After:
> 
> % perf stat  -a  -e unc_c_llc_lookup.any sleep 1
> 
>  Performance counter stats for 'system wide':
> 
>          2,685,120 Bytes unc_c_llc_lookup.any
> 
>        1.002648032 seconds time elapsed


if one of them is not supported, we get wrong output:


[jolsa@krava perf]$ sudo ./perf stat --no-merge -a  -e clockticks sleep 1

 Performance counter stats for 'system wide':

   <not supported>      clockticks                                                  
         4,925,158      clockticks                                                  

       1.000982200 seconds time elapsed

[jolsa@krava perf]$ sudo ./perf stat  -a  -e clockticks sleep 1

 Performance counter stats for 'system wide':

   <not supported>      clockticks                                                  

       1.000850195 seconds time elapsed

jirka

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH 07/11] perf, tools: Collapse identically named events in  perf stat Jiri Olsa <jolsa@redhat.com> - 2017-01-18 13:50 +0100
  Re: [PATCH 07/11] perf, tools: Collapse identically named events in  perf stat Andi Kleen <ak@linux.intel.com> - 2017-01-18 17:40 +0100
    Re: [PATCH 07/11] perf, tools: Collapse identically named events in  perf stat Jiri Olsa <jolsa@redhat.com> - 2017-01-18 18:00 +0100
      Re: [PATCH 07/11] perf, tools: Collapse identically named events in  perf stat Andi Kleen <ak@linux.intel.com> - 2017-01-18 18:30 +0100

csiph-web