linux-kernel - Re: [PATCH v6] soc: qcom: add l2 cache perf events driver

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Date:   Tue, 4 Oct 2016 12:25:54 -0400
From:   Neil Leeder <nleeder@...eaurora.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Mark Langsdorf <mlangsdo@...hat.com>,
        Mark Salter <msalter@...hat.com>, Jon Masters <jcm@...hat.com>,
        Timur Tabi <timur@...eaurora.org>, cov@...eaurora.org,
        nleeder@...eaurora.org
Subject: Re: [PATCH v6] soc: qcom: add l2 cache perf events driver


On 10/4/2016 11:53 AM, Mark Rutland wrote:
> Hi Neil,
> 
> On Wed, Sep 21, 2016 at 05:12:54PM -0400, Neil Leeder wrote:
>> Adds perf events support for L2 cache PMU.
>>
>> The L2 cache PMU driver is named 'l2cache_0' and can be used
>> with perf events to profile L2 events such as cache hits
>> and misses.
>>
>> Signed-off-by: Neil Leeder <nleeder@...eaurora.org>
>> ---
> 
>>  drivers/soc/qcom/Kconfig         |   9 +
>>  drivers/soc/qcom/Makefile        |   1 +
>>  drivers/soc/qcom/perf_event_l2.c | 948 +++++++++++++++++++++++++++++++++++++++
>>  include/linux/cpuhotplug.h       |   1 +
>>  4 files changed, 959 insertions(+)
>>  create mode 100644 drivers/soc/qcom/perf_event_l2.c
> 
> Apologies for the delay; this has been on my todo list, but I've been a
> little distracted and haven't had the time necessary to devote to this.
> It's somewhat unusual given the constraint logic and the percpu uncore
> component, so there's more to consider than usual.
> 
> At a high level, this will need to be moved to drivers/perf/, per [1].
> 
> Can you move the driver there, and post the result atop of v4.8-rc1 at
> the end of the merge window? Until then, I can't guarantee that I'll
> have the time to look at this.
> 
> Can you also give Vince's perf fuzzer [2] a spin against the driver? I
> can't recall if we covered that previously, and in practice it's found a
> number of issues in drivers that have otherwise looked fine. If you've
> done so, it'd be worth noting in the cover.
> 
> Thanks,
> Mark.
> 
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-September/457188.html
> [2] https://github.com/deater/perf_event_tests
> 

Thanks Mark. I'll move it, rebase on 4.9-rc1 and run perf fuzzer.

Neil
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