linux-kernel - Re: [PATCH v2] perf test x86: address multiplexing in rdpmc test

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Message-ID: <20200323122925.GH2452@worktop.programming.kicks-ass.net>
Date:   Mon, 23 Mar 2020 13:29:25 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Ian Rogers <irogers@...gle.com>, Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-kernel@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2] perf test x86: address multiplexing in rdpmc test

On Sun, Mar 22, 2020 at 04:18:20PM -0700, Andi Kleen wrote:
> > Here's something a little better. Much of it copied from linux/math64.h
> > and asm/div64.h.
> 
> Not sure what the point is of micro optimizing a unit test?
> 
> This is never run in production.

People might use it as an example of how to use the stuff.. and then
copy horrendous crap code.