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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84a4f278aecsm2875451b3a.24.2026.07.15.03.12.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Jul 2026 03:12:27 -0700 (PDT) Message-ID: <273ea1c6-0c79-400c-b210-dc44680bd01f@redhat.com> Date: Wed, 15 Jul 2026 20:12:13 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/5] arm_mpam: resctrl: Pick classes for use as MBM counters 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, jic23@kernel.org, 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, zengheng4@huawei.com, x86@kernel.org, leitao@kernel.org, kas@kernel.org, puranjay@kernel.org, usama.arif@linux.dev, kernel-team@meta.com, Shaopeng Tan , Jonathan Cameron References: <20260707162440.12132-1-ben.horgan@arm.com> <20260707162440.12132-2-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260707162440.12132-2-ben.horgan@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 7/8/26 2:24 AM, Ben Horgan wrote: > From: James Morse > > resctrl has two types of bandwidth counters, NUMA-local and global. MPAM > can only count globally; either using MSC at the L3 cache or in the memory > controllers. When global and local equate to the same thing continue just > to call it global. > > Pick the corresponding MPAM classes to back the MBM counters. As resctrl > requires all monitors to be at the L3 cache, we can only use the counters > at the memory controllers when they have the same topology as the L3 cache > and the traffic they see if the same. In particular, for the bandwidth > counters at the memory controllers to be exposed to resctrl it is required > there is a single L3 cache and a single NUMA node as otherwise cross NUMA > traffic will be counted at the wrong instance. > > Signed-off-by: James Morse > Signed-off-by: Ben Horgan > Tested-by: Shaopeng Tan > Tested-by: Zeng Heng > Tested-by: Fenghua Yu > Reviewed-by: Shaopeng Tan > Reviewed-by: Jonathan Cameron > Reviewed-by: Fenghua Yu > --- > Changes since rfc v1: > Move finding any_mon_comp into monitor boilerplate patch > Move mpam_resctrl_get_domain_from_cpu() into monitor boilerplate > Remove free running check > Trim commit message > > Changes since v3: > Extra paragraph in commit message > > Changes since v4: > Commit message tag ordering > New sentence in block comment (Fenghua) > --- > drivers/resctrl/mpam_resctrl.c | 28 ++++++++++++++++++++++++++++ > 1 file changed, 28 insertions(+) > Reviewed-by: Gavin Shan