linux-kernel - Re: [PATCH] tools/perf-bench: Add basic syscall benchmark

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Message-ID: <20200514203942.v2dbjeqrdpuucx5h@treble>
Date:   Thu, 14 May 2020 15:39:42 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Davidlohr Bueso <dave@...olabs.net>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Ingo Molnar <mingo@...nel.org>, mgorman@...hsingularity.net,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>,
        Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] tools/perf-bench: Add basic syscall benchmark

On Fri, Mar 08, 2019 at 10:17:47AM -0800, Davidlohr Bueso wrote:
> On Thu, 07 Mar 2019, Arnaldo Carvalho de Melo wrote:
> > You forgot to update tools/perf/Documentation/perf-bench.txt, and please
> > take a look at tools/perf/util/pmu.c convert_scale() to see how to save
> > the current locale, set the one you want, then restore the previous one,
> > so that at the end of this benchmark the environment is back to where it
> > was.
> 
> Here's an updated version with the corresponding docs, but I removed the
> setlocale() - doesn't seem worth it; I hope Mel has no strong objection.
> 
> Thanks.
> 
> -------8<----------------------------------------------------------
> [PATCH v2] tools/perf-bench: Add basic syscall benchmark
> 
> The usefulness of having a standard way of testing syscall performance
> has come up from time to time[0]. Furthermore, some of our testing
> machinery (such as 'mmtests') already makes use of a simplified version
> of the microbenchmark. This patch mainly takes the same idea to measure
> syscall throughput compatible with 'perf-bench' via getppid(2), yet
> without any of the additional template stuff from Ingo's version (based
> on numa.c). The code is identical to what mmtests uses.
> 
> [0] https://lore.kernel.org/lkml/20160201074156.GA27156@gmail.com/
> 
> Signed-off-by: Davidlohr Bueso <dbueso@...e.de>

It would be nice to see this merged.  I posted something very similar
back in 2016.

-- 
Josh