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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
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