linux-kernel - Re: [PATCH v2 0/4] Perf tool: Enable Arm arch timer counter and arm-spe's timestamp

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Date:   Thu, 13 Aug 2020 09:54:10 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Ian Rogers <irogers@...gle.com>, Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....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>,
        Kemeng Shi <shikemeng@...wei.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Igor Lubashev <ilubashe@...mai.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        James Clark <james.clark@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] Perf tool: Enable Arm arch timer counter and
 arm-spe's timestamp

On Wed, Aug 12, 2020 at 03:53:34PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Aug 12, 2020 at 10:06:53AM -0600, Mathieu Poirier escreveu:
> > Hi Arnaldo,
> > 
> > On Fri, 7 Aug 2020 at 01:16, Leo Yan <leo.yan@...aro.org> wrote:
> > >
> > > This patch set is to enable Arm arch timer counter and Arm SPE is the
> > > first customer to use arch timer counter for its timestamp.
> > >
> > > Patches 01 ~ 03 enables Arm arch timer counter in Perf tool; patch 01 is
> > > to retrieve arch timer's parameters from mmaped page; patch 02 provides
> > > APIs for the conversion between arch timer's counter and time; patch 03
> > > adds a test for patches 01 and 02.
> > >
> > > As the first customer to use Arm arch timer counter in perf tool, patch
> > > 04 is to generate sample's timestamp for ARM SPE AUX trace data.
> > >
> > > This patch set has been rebased on perf/core branch with the latest
> > > commit c4735d990268 ("perf evsel: Don't set
> > > sample_regs_intr/sample_regs_user for dummy event").
> > 
> > The ARM SPE perf tools code is orphan and I don't have the cycles to
> > pick it up.  Leo has spent a lot of time in that code and as such I
> > suggest that he starts maintaining it, probably following the same
> > kind of arrangement you and I have for coresight.
> 
> Thats ok with me, I think we should reflect that on the MAINTAINERS
> file, right?

Very appreciate for the promoting, Mathieu and Arnaldo.

> We have this already:
> 
> PERFORMANCE EVENTS SUBSYSTEM ARM64 PMU EVENTS
> R:      John Garry <john.garry@...wei.com>
> R:      Will Deacon <will@...nel.org>
> L:      linux-arm-kernel@...ts.infradead.org (moderated for non-subscribers)
> S:      Supported
> F:      tools/perf/pmu-events/arch/arm64/
> 
> I think we should have entries for CoreSight and ARM SPE, one listing
> you as the maintainer and the other listing Leo, right?
> 
> Leo, it would be good for you to try and find someone at your
> organization or elsewhere that could help with this, this way I would
> wait a bit, see if someone else Acks it, and collect those, processing
> it from you after a while if nobody chimes in.

I will follow up this and might offline to check with relevant
maintainers (Will and John) for what's good way to proceed.

> Please continue providing 'perf test' regression tests, etc, to help
> with maintaining this code being checked.

Sure, I'm glad to continue the maintaining and testing works :)

Thanks,
Leo