Perf top always show 0.00

[Jason Liu]

2014-04-23 22:26 GMT+08:00 Frank Li <lznuaa at gmail.com>:
> 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
>

Here is my log:

root at imx6qdlsolo:/# perf --version
perf version 3.10.31

root at imx6qdlsolo:/# perf top

   PerfTop:      66 irqs/sec  kernel:78.8%  exact:  0.0% [4000Hz
cycles],  (all, 1 CPU)
-------------------------------------------------------------------------------

    21.95%  perf            [.] 0x00025b44
    13.73%  [kernel]        [k] cpuidle_enter_state
     5.32%  libc-2.19.so    [.] strstr
     4.64%  libc-2.19.so    [.] 0x000725d0
     3.61%  [kernel]        [k] _raw_spin_unlock_irqrestore
     2.78%  libc-2.19.so    [.] __libc_calloc
     2.41%  libc-2.19.so    [.] strcmp
     2.29%  libbfd-2.24.so  [.] 0x000819d0
     2.17%  libc-2.19.so    [.] memchr
     2.11%  libc-2.19.so    [.] strchr
     1.94%  [kernel]        [k] finish_task_switch
     1.81%  [kernel]        [k] kallsyms_expand_symbol.constprop.7
     1.57%  [kernel]        [k] vsnprintf
     1.46%  [kernel]        [k] __do_softirq
     1.43%  libc-2.19.so    [.] strlen
     1.35%  libc-2.19.so    [.] vfprintf
     1.26%  libc-2.19.so    [.] strncmp
     1.22%  [kernel]        [k] format_decode
     1.21%  [kernel]        [k] number.isra.2
     1.12%  libc-2.19.so    [.] memset
     1.07%  libc-2.19.so    [.] memcpy

You can try 3.10.31 release branch.

Jason Liu

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