Perf top always show 0.00

[Jason Liu]

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
>
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