linux-kernel - Re: Add top down metrics to perf stat

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Date:	Thu, 12 May 2016 09:47:00 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, peterz@...radead.org, jolsa@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 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@...-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%           
     ...