linux-kernel - Re: [PATCH v2 05/19] perf, tools: Support weak groups

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Date:   Tue, 22 Aug 2017 14:00:43 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Andi Kleen <andi@...stfloor.org>, acme@...nel.org,
        jolsa@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/19] perf, tools: Support weak groups

> also if I put 'cycles' instead of the l2_rqsts.all_code_rd,
> I get clean open but 'not counted' as result.. I wonder
> there's some counter scheduling issue
> 
> [root@...va perf]# ./perf stat -v -e '{branches,branch-misses,l1d.replacement,l2_lines_in.all,cycles}:W' -a sleep 1
> Using CPUID GenuineIntel-6-3D
> l1d.replacement -> cpu/umask=0x1,period=2000003,event=0x51/
> l2_lines_in.all -> cpu/umask=0x7,period=100003,event=0xf1/
> branches: 0 4004293853 0
> branch-misses: 0 4004293853 0
> l1d.replacement: 0 4004293853 0
> l2_lines_in.all: 0 4004293853 0
> cycles: 0 4004293853 0
> 
>  Performance counter stats for 'system wide':
> 
>      <not counted>      branches                                                      (0.00%)
>      <not counted>      branch-misses                                                 (0.00%)
>      <not counted>      l1d.replacement                                               (0.00%)
>      <not counted>      l2_lines_in.all                                               (0.00%)
>      <not counted>      cycles                                                        (0.00%)
> 
>        1.001088589 seconds time elapsed

Cannot reproduce on my system

Does it work without group or a normal group?

./perf stat -v -e '{branches,branch-misses,l1d.replacement,l2_lines_in.all,cycles}:W'
Using CPUID GenuineIntel-6-3E
l1d.replacement -> cpu/umask=0x1,period=2000003,event=0x51/
l2_lines_in.all -> cpu/umask=0x7,period=100003,event=0xf1/
^Cbranches: 105004611 27393959413 27393959413
branch-misses: 5854172 27393959413 27393959413
l1d.replacement: 13935607 27393959413 27393959413
l2_lines_in.all: 24987238 27393959413 27393959413
cycles: 1259015810 27393959413 27393959413

 Performance counter stats for 'system wide':

       105,004,611      branches                                                    
         5,854,172      branch-misses             #    5.58% of all branches        
        13,935,607      l1d.replacement                                             
        24,987,238      l2_lines_in.all                                             
     1,259,015,810      cycles                                                      

       2.282966609 seconds time elapsed