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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-38e2a06c049sm298694a91.0.2026.07.15.03.23.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Jul 2026 03:23:32 -0700 (PDT) Message-ID: <24d5d407-896e-4136-b7c0-91b006670b9a@redhat.com> Date: Wed, 15 Jul 2026 20:23:18 +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 4/5] arm_mpam: resctrl: Add resctrl_arch_cntr_read() & resctrl_arch_reset_cntr() 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> <20260707162440.12132-5-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260707162440.12132-5-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 > > When used in 'mbm_event' mode, ABMC emulation, resctrl uses arch hooks to > read and reset the memory bandwidth utilization (MBWU) counters. > > Add these. > > Signed-off-by: James Morse > Signed-off-by: Ben Horgan > Tested-by: Shaopeng Tan > Tested-by: Fenghua Yu > Reviewed-by: Jonathan Cameron > Reviewed-by: Shaopeng Tan > Reviewed-by: Fenghua Yu > --- > Changes since rfc v1: > Move __reset_mon() and reset_mon_cdp_safe() helpers here > support mbwu in __read_mon() > Mention mbm_event mode in commit message > > Changes since v3: > USE_PREALLOCATED_IDX, separate h/w counters are needed for code and data > when cdp_enabled is true > --- > drivers/resctrl/mpam_resctrl.c | 99 +++++++++++++++++++++++++++++----- > 1 file changed, 86 insertions(+), 13 deletions(-) > Reviewed-by: Gavin Shan