Perf top always show 0.00

[Frank Li]

On Wed, Apr 23, 2014 at 4:15 AM, Jason Liu <liu.h.jason at gmail.com> wrote:
> Frank,
>
> 2014-04-19 1:00 GMT+08:00 Frank Li <lznuaa at gmail.com>:
>> I use mx6dq platform. Found below problem.
>>
>> Run Perf top. First column always 0, but order look like correct.
>>
>>    0.00%  perf          [.] 0x00049420
>>      0.00%  [kernel]      [k] kallsyms_expand_symbol.constprop.5
>>      0.00%  [kernel]      [k] vsnprintf
>>      0.00%  [kernel]      [k] arch_cpu_idle
>>      0.00%  [kernel]      [k] format_decode
>>      0.00%  [kernel]      [k] number.isra.2
>>      0.00%  libc-2.19.so  [.] strstr
>>      0.00%  libc-2.19.so  [.] 0x00072498
>>      0.00%  libc-2.19.so  [.] memchr
>>      0.00%  [kernel]      [k] _raw_spin_unlock_irqrestore
>>      0.00%  [kernel]      [k] string.isra.4
>>      0.00%  [kernel]      [k] strnlen
>>      0.00%  libc-2.19.so  [.] getdelim
>>      0.00%  libc-2.19.so  [.] memcpy
>>      0.00%  [kernel]      [k] lock_acquire
>>      0.00%  libc-2.19.so  [.] strchr
>>      0.00%  libc-2.19.so  [.] strcmp
>>      0.00%  [kernel]      [k] _raw_spin_unlock_irq
>>      0.00%  libc-2.19.so  [.] __libc_calloc
>>      0.00%  libc-2.19.so  [.] _IO_feof
>>      0.00%  [kernel]      [k] pointer.isra.15
>
> This issue has been resolved by the following commit:
>
> commit 9dfd005a3f4e1c648cb4aa1dc70604bb370c5e7b
> Author: Michael Hudson-Doyle <michael.hudson at linaro.org>
> Date:   Thu Oct 31 16:47:45 2013 -0700
>
>     perf tools: Remove cast of non-variadic function to variadic
>
>     commit 53805eca3d89b095062c11a6798689bb0af09216 upstream.
>
>     The 4fb71074a570 (perf ui/hist: Consolidate hpp helpers) cset introduced
>     a cast of percent_color_snprintf to a function pointer type with
>     varargs.  Change percent_color_snprintf to be variadic and remove the
>     cast.
>
>     The symptom of this was all percentages being reported as 0.00% in perf
>     report --stdio output on the armhf arch.
>
>     Signed-off-by: Michael Hudson-Doyle <michael.hudson at linaro.org>
>     Acked-by: Namhyung Kim <namhyung at kernel.org>
>     Acked-by: Will Deacon <will.deacon at arm.com>
>     Cc: Jean Pihet <jean.pihet at linaro.org>
>     Cc: Jiri Olsa <jolsa at redhat.com>
>     Cc: Will Deacon <will.deacon at arm.com>
>     Link: http://lkml.kernel.org/r/87zjppvw7y.fsf@canonical.com
>     Signed-off-by: Arnaldo Carvalho de Melo <acme at redhat.com>
>     Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
>
>
> Jason Liu

I tested it. still 0.00%
0.00%  perf          [.] 0x000494a0
     0.00%  [kernel]      [k] cpuidle_enter_state
     0.00%  [kernel]      [k] kallsyms_expand_symbol.constprop.7
     0.00%  libc-2.19.so  [.] 0x0006f6a4
     0.00%  [kernel]      [k] vsnprintf
     0.00%  libc-2.19.so  [.] strstr
     0.00%  [kernel]      [k] format_decode
     0.00%  libc-2.19.so  [.] memchr
     0.00%  [kernel]      [k] number.isra.2
     0.00%  libc-2.19.so  [.] memcpy
     0.00%  libc-2.19.so  [.] getdelim
     0.00%  libc-2.19.so  [.] __libc_calloc
     0.00%  [kernel]      [k] _raw_spin_unlock_irq
     0.00%  libc-2.19.so  [.] strchr
     0.00%  [kernel]      [k] strnlen
     0.00%  [kernel]      [k] _raw_spin_unlock_irqrestore
     0.00%  libc-2.19.so  [.] strcmp
     0.00%  [kernel]      [k] __do_softirq
     0.00%  [kernel]      [k] string.isra.4
     0.00%  libc-2.19.so  [.] _IO_feof
     0.00%  [kernel]      [k] tick_nohz_idle_enter

>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel