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

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Date:	Mon, 16 May 2016 14:58:38 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, peterz@...radead.org, jolsa@...nel.org,
	mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: Add top down metrics to perf stat

On Fri, May 13, 2016 at 06:44:49PM -0700, Andi Kleen wrote:

SNIP

>     
> The formulas to compute the metrics are generic, they
> only change based on the availability on the abstracted
> input values.
>     
> 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%           

you've lost first 3 header lines (time/core/cpus):

[jolsa@...-x3650m4-01 perf]$ sudo ./perf stat --per-core -e cycles -I 1000 -a
#           time core         cpus             counts unit events
     1.000310344 S0-C0           2      3,764,470,414      cycles                                                      
     1.000310344 S0-C1           2      3,764,445,293      cycles                                                      
     1.000310344 S0-C2           2      3,764,428,422      cycles                                                      

also I'm still getting -0% as I mentioned in my previous comment:

[jolsa@...-x3650m4-01 perf]$ sudo ./perf stat --topdown -I 1000 -a
nmi_watchdog enabled with topdown. May give wrong results.
Disable with echo 0 > /proc/sys/kernel/nmi_watchdog
     1.001615409                   retiring             bad speculation      frontend bound       backend bound        
     1.001615409 S0-C0           2     38.3%                0.0%               58.4%                3.3%           
     1.001615409 S0-C1           2     38.1%               -0.0%               59.3%                2.6%           
     1.001615409 S0-C2           2     38.1%                0.0%               58.9%                2.9%           
     1.001615409 S0-C3           2     38.1%               -0.0%               58.9%                3.0%           
     1.001615409 S0-C4           2     38.0%                0.0%               59.0%                2.9%           
     1.001615409 S0-C5           2     38.1%               -0.0%               58.6%                3.3%           
     1.001615409 S1-C0           2     49.7%                1.9%               44.7%                3.7%           

thanks,
jirka