linux-kernel - Re: [PATCH] perf stat: Show percore counts in per CPU output

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Date:   Mon, 10 Feb 2020 09:01:59 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     "Jin, Yao" <yao.jin@...ux.intel.com>, acme@...nel.org,
        jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH] perf stat: Show percore counts in per CPU output

> > With --percore-show-thread, CPU0 and CPU4 have the same counts (CPU0 and
> > CPU4 are siblings, e.g. 2,453,061 in my example). The value is sum of CPU0 +
> > CPU4.
> 
> so it shows percore stats but displays all the cpus? what is this good for?

This is essentially a replacement for the any bit (which is gone in Icelake).
Per core counts are useful for some formulas, e.g. CoreIPC

The original percore version was inconvenient to post process. This
variant matches the output of the any bit.

-Andi