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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82b03bbebbfsm9997455b3a.18.2026.03.22.23.51.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 22 Mar 2026 23:52:12 -0700 (PDT) Message-ID: <98e46fa1-8e33-4288-9894-e1756da113e2@redhat.com> Date: Mon, 23 Mar 2026 16:51:56 +1000 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 18/40] arm_mpam: resctrl: Implement helpers to update configuration To: Ben Horgan Cc: amitsinght@marvell.com, baisheng.gao@unisoc.com, baolin.wang@linux.alibaba.com, carl@os.amperecomputing.com, dave.martin@arm.com, david@kernel.org, dfustini@baylibre.com, fenghuay@nvidia.com, james.morse@arm.com, jonathan.cameron@huawei.com, kobak@nvidia.com, lcherian@marvell.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, peternewman@google.com, punit.agrawal@oss.qualcomm.com, quic_jiles@quicinc.com, reinette.chatre@intel.com, rohit.mathew@arm.com, scott@os.amperecomputing.com, sdonthineni@nvidia.com, tan.shaopeng@fujitsu.com, xhao@linux.alibaba.com, catalin.marinas@arm.com, will@kernel.org, corbet@lwn.net, maz@kernel.org, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, kvmarm@lists.linux.dev, zengheng4@huawei.com, linux-doc@vger.kernel.org, Shaopeng Tan References: <20260313144617.3420416-1-ben.horgan@arm.com> <20260313144617.3420416-19-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260313144617.3420416-19-ben.horgan@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 3/14/26 12:45 AM, Ben Horgan wrote: > From: James Morse > > resctrl has two helpers for updating the configuration. > resctrl_arch_update_one() updates a single value, and is used by the > software-controller to apply feedback to the bandwidth controls, it has to > be called on one of the CPUs in the resctrl:domain. > > resctrl_arch_update_domains() copies multiple staged configurations, it can > be called from anywhere. > > Both helpers should update any changes to the underlying hardware. > > Implement resctrl_arch_update_domains() to use > resctrl_arch_update_one(). Neither need to be called on a specific CPU as > the mpam driver will send IPIs as needed. > > Tested-by: Gavin Shan > Tested-by: Shaopeng Tan > Tested-by: Peter Newman > Tested-by: Zeng Heng > Tested-by: Punit Agrawal > Reviewed-by: Zeng Heng > Reviewed-by: Shaopeng Tan > Reviewed-by: Jonathan Cameron > Signed-off-by: James Morse > Signed-off-by: Ben Horgan > --- > Changes since rfc: > list_for_each_entry -> list_for_each_entry_rcu > return 0 > Restrict scope of local variables > > Changes since v2: > whitespace fix > --- > drivers/resctrl/mpam_resctrl.c | 70 ++++++++++++++++++++++++++++++++++ > 1 file changed, 70 insertions(+) > Reviewed-by: Gavin Shan