Re: [PATCH v6] soc: qcom: add l2 cache perf events driver
From: Neil Leeder
Date: Tue Oct 04 2016 - 12:26:01 EST
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@xxxxxxxxxxxxxx>
>> 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 .
> 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  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.
>  http://lists.infradead.org/pipermail/linux-arm-kernel/2016-September/457188.html
>  https://github.com/deater/perf_event_tests
Thanks Mark. I'll move it, rebase on 4.9-rc1 and run perf fuzzer.
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