From mboxrd@z Thu Jan 1 00:00:00 1970 From: agustinv@codeaurora.org (Agustin Vega-Frias) Date: Fri, 17 Mar 2017 10:30:33 -0400 Subject: [PATCH V4] perf: qcom: Add L3 cache PMU driver In-Reply-To: <1489760657-26961-1-git-send-email-agustinv@codeaurora.org> References: <1489760657-26961-1-git-send-email-agustinv@codeaurora.org> Message-ID: <74bb476166cc6b7f378de337cfd4bfe7@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 2017-03-17 10:24, Agustin Vega-Frias wrote: > This adds a new dynamic PMU to the Perf Events framework to program > and control the L3 cache PMUs in some Qualcomm Technologies SOCs. > > The driver supports a distributed cache architecture where the overall > cache for a socket is comprised of multiple slices each with its own > PMU. > Access to each individual PMU is provided even though all CPUs share > all > the slices. User space needs to aggregate to individual counts to > provide > a global picture. > > The driver exports formatting and event information to sysfs so it can > be used by the perf user space tools with the syntaxes: > perf stat -a -e l3cache_0_0/read-miss/ > perf stat -a -e l3cache_0_0/event=0x21/ > > Signed-off-by: Agustin Vega-Frias > --- > Documentation/perf/qcom_l3_pmu.txt | 25 ++ > drivers/perf/Kconfig | 10 + > drivers/perf/Makefile | 1 + > drivers/perf/qcom_l3_pmu.c | 825 > +++++++++++++++++++++++++++++++++++++ > include/linux/cpuhotplug.h | 1 + > 5 files changed, 862 insertions(+) > create mode 100644 Documentation/perf/qcom_l3_pmu.txt > create mode 100644 drivers/perf/qcom_l3_pmu.c This was built and tested on top of v4.11-rc2. The perf fuzzer was run overnight and no stability issues were found. -- Qualcomm Datacenter Technologies, Inc. on behalf of the Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.