linux-kernel - RE: [PATCH 1/3] perf bench futex: benchmark only online CPUs

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Date:   Fri, 24 Nov 2017 21:30:23 +0000
From:   James Yang <James.Yang@....com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Davidlohr Bueso <dave@...olabs.net>
CC:     Kim Phillips <Kim.Phillips@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        "Namhyung Kim" <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Darren Hart <dvhart@...radead.org>,
        Colin Ian King <colin.king@...onical.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/3] perf bench futex: benchmark only online CPUs

> -----Original Message-----
> From: Arnaldo Carvalho de Melo [mailto:acme@...nel.org]
> Sent: Friday, November 24, 2017 1:09 PM
> To: Davidlohr Bueso <dave@...olabs.net>
> Cc: James Yang <James.Yang@....com>; Kim Phillips <Kim.Phillips@....com>;
> Peter Zijlstra <peterz@...radead.org>; Ingo Molnar <mingo@...hat.com>;
> Alexander Shishkin <alexander.shishkin@...ux.intel.com>; Jiri Olsa
> <jolsa@...hat.com>; Namhyung Kim <namhyung@...nel.org>; Thomas Gleixner
> <tglx@...utronix.de>; Darren Hart <dvhart@...radead.org>; Colin Ian King
> <colin.king@...onical.com>; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 1/3] perf bench futex: benchmark only online CPUs
>
> I try not to ask too much from people, i.e. their work already improves
> the current situation, for their use case, so could be applied, but
> yeah, it would be better, if James (or somebody else) is willing to try
> and use the perf cpumap infrastructure to reduce the bloat and actually
> validate even more it, James?
>
> - Arnaldo

Sorry for the delayed response.  We are on holiday.

These patches were written over a year ago.  I did not send it to lkml.

I did not continue development because I remember seeing an equivalent fix in another patch or a newer kernel than the one against which I wrote the patch.

I am busy with other things at this time, so if Kim (or someone else) wants to rewrite the patch to use cpumap, he should do it because I don't have the time to do it.
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