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

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Message-ID: <f3cbe339-0daa-054b-4c28-d8f130206a44@huawei.com>
Date:   Thu, 13 Aug 2020 13:08:02 +0100
From:   John Garry <john.garry@...wei.com>
To:     Will Deacon <will@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
CC:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>, Ian Rogers <irogers@...gle.com>,
        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 13/08/2020 12:18, Will Deacon wrote:
> [ Adding John, as I only just realised he wasn't on CC and we were talking
>    about him! ]
> 
> On Thu, Aug 13, 2020 at 10:59:01AM +0100, Will Deacon wrote:
>> 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:
>>>> 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?
>>>
>>> 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?
>>
>> Fine by me. I'll continue to maintain the in-kernel SPE driver, but I'd love
>> to see somebody step up to looking after the userspace code. It's seriously
>> unloved on arm64 :(
>>
>> I'd even be happy to see one or two M: entries added for
>> tools/perf/pmu-events/arch/arm64/. I realistically don't have the time to
>> take that on, but I'd be thrilled if any/all of John, Mathieu and Leo were
>> to be listed there if they are willing to do so and can spare the time to
>> look after it. Even just silly things like making sure the thing
>> cross-compiles have been broken in the recent past, so it's not necessarily
>> about handling huge amounts of incoming patches.
>>
>> In other words, rather than slice up the arm64 parts of the perf tool, I'd
>> argue in favour of a joint maintainership model for all the arm64 bits, if
>> we have a few willing volunteers.

Right, it makes sense not to chop up too much, so happy to see 
"PERFORMANCE EVENTS SUBSYSTEM ARM64 PMU EVENTS" expanded in terms of 
scope and membership.