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    SubjectRe: Add top down metrics to perf stat
    On Thu, May 05, 2016 at 04:03:57PM -0700, Andi Kleen wrote:

    SNIP

    > The kernel declares the events supported by the current
    > CPU and perf stat then computes the formulas based on the
    > available metrics.
    >
    >
    > Example output:
    >
    > $ perf stat --topdown -I 1000 cmd
    > 1.000735655 frontend bound retiring bad speculation backend bound
    > 1.000735655 S0-C0 2 47.84% 11.69% 8.37% 32.10%
    > 1.000735655 S0-C1 2 45.53% 11.39% 8.52% 34.56%
    > 2.003978563 S0-C0 2 49.47% 12.22% 8.65% 29.66%
    > 2.003978563 S0-C1 2 47.21% 12.98% 8.77% 31.04%
    > 3.004901432 S0-C0 2 49.35% 12.26% 8.68% 29.70%
    > 3.004901432 S0-C1 2 47.23% 12.67% 8.76% 31.35%
    > 4.005766611 S0-C0 2 48.44% 12.14% 8.59% 30.82%
    > 4.005766611 S0-C1 2 46.07% 12.41% 8.67% 32.85%
    > 5.006580592 S0-C0 2 47.91% 12.08% 8.57% 31.44%
    > 5.006580592 S0-C1 2 45.57% 12.27% 8.63% 33.53%
    > 6.007545125 S0-C0 2 47.45% 12.02% 8.57% 31.96%
    > 6.007545125 S0-C1 2 45.13% 12.17% 8.57% 34.14%
    > 7.008539347 S0-C0 2 47.07% 12.03% 8.61% 32.29%


    getting -0% for bad speculation.. im on your perf/top-down-20

    thanks,
    jirka


    [root@ibm-x3650m4-01 perf]# ./perf stat --topdown -a -I 1000
    nmi_watchdog enabled with topdown. May give wrong results.
    Disable with echo 0 > /proc/sys/kernel/nmi_watchdog
    1.002322346 retiring bad speculation frontend bound backend bound
    1.002322346 S0-C0 2 38.3% 0.0% 57.9% 3.8%
    1.002322346 S0-C1 2 38.3% 0.0% 59.1% 2.6%
    1.002322346 S0-C2 2 38.3% 0.0% 59.0% 2.6%
    1.002322346 S0-C3 2 38.3% 0.0% 58.7% 3.0%
    1.002322346 S0-C4 2 38.3% -0.0% 58.6% 3.1%
    1.002322346 S0-C5 2 38.4% -0.0% 58.3% 3.3%
    1.002322346 S1-C0 2 38.3% -0.0% 58.7% 3.0%
    1.002322346 S1-C1 2 38.3% 0.0% 59.7% 2.0%
    1.002322346 S1-C2 2 38.3% -0.0% 59.3% 2.5%
    1.002322346 S1-C3 2 38.3% -0.0% 59.1% 2.5%
    1.002322346 S1-C4 2 38.3% 0.0% 59.1% 2.6%
    1.002322346 S1-C5 2 38.3% -0.0% 59.1% 2.7%
    2.005429451 S0-C0 2 38.3% 0.0% 57.9% 3.8%
    ...

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