linux-kernel - Re: [PATCH] perf tests: Fix complex event name parsing

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Date:   Thu, 26 Jul 2018 10:04:47 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Sandipan Das <sandipan@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, alexey.budankov@...ux.intel.com,
        jolsa@...hat.com, ravi.bangoria@...ux.vnet.ibm.com,
        naveen.n.rao@...ux.vnet.ibm.com
Subject: Re: [PATCH] perf tests: Fix complex event name parsing

Em Thu, Jul 26, 2018 at 04:25:02PM +0530, Sandipan Das escreveu:
> The 'umask' event parameter is unsupported on some architectures
> like powerpc64.
 
> This can be observed on a powerpc64le system running Fedora 27 as
> shown below.
 
>   # perf test "Parse event definition strings" -v
>    6: Parse event definition strings                        :
>   --- start ---
>   test child forked, pid 45915
>   ...
>   running test 3 'cpu/name='COMPLEX_CYCLES_NAME:orig=cycles,desc=chip-clock-ticks',period=0x1,event=0x2,umask=0x3/ukp'Invalid event/parameter 'umask'
>   Invalid event/parameter 'umask'
>   failed to parse event 'cpu/name='COMPLEX_CYCLES_NAME:orig=cycles,desc=chip-clock-ticks',period=0x1,event=0x2,umask=0x3/ukp', err 1, str 'unknown term'
>   event syntax error: '..,event=0x2,umask=0x3/ukp'
>                                     \___ unknown term
 
>   valid terms: event,mark,pmc,cache_sel,pmcxsel,unit,thresh_stop,thresh_start,combine,thresh_sel,thresh_cmp,sample_mode,config,config1,config2,name,period,freq,branch_type,time,call-graph,stack-size,no-inherit,inherit,max-stack,no-overwrite,overwrite,driver-config
 
>   mem_access -> cpu/event=0x10401e0/
>   running test 0 'config=10,config1,config2=3,umask=1'
>   test child finished with 1
>   ---- end ----
>   Parse event definition strings: FAILED!

Thanks, applied, and tested it in a x86_64 fedora 27 machine:

    Committer testing:
    
    After applying the patch these test passes and in verbose mode we get:
    
      # perf test -v "event definition"
       6: Parse event definition strings:
      --- start ---
      test child forked, pid 11061
      running test 0 'syscalls:sys_enter_openat'Using CPUID GenuineIntel-6-9E
      <SNIP>
      running test 53 'cycles/name='COMPLEX_CYCLES_NAME:orig=cycles,desc=chip-clock-ticks'/Duk'
      running test 0 'cpu/config=10,config1,config2=3,period=1000/u'
      running test 1 'cpu/config=1,name=krava/u,cpu/config=2/u'
      running test 2 'cpu/config=1,call-graph=fp,time,period=100000/,cpu/config=2,call-graph=no,time=0,period=2000/'
      running test 3 'cpu/name='COMPLEX_CYCLES_NAME:orig=cycles,desc=chip-clock-ticks',period=0x1,event=0x2/ukp'
      <SNIP>
      test child finished with 0
      ---- end ----
      Parse event definition strings: Ok
      #

- Arnaldo