From: Jonathan Cameron <jonathan.cameron@huawei.com>
To: Ben Horgan <ben.horgan@arm.com>
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>,
<gshan@redhat.com>, <james.morse@arm.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>,
Zeng Heng <zengheng4@huawei.com>
Subject: Re: [PATCH v3 27/47] arm_mpam: resctrl: Add support for 'MB' resource
Date: Tue, 13 Jan 2026 15:06:18 +0000 [thread overview]
Message-ID: <20260113150618.00003829@huawei.com> (raw)
In-Reply-To: <20260112165914.4086692-28-ben.horgan@arm.com>
On Mon, 12 Jan 2026 16:58:54 +0000
Ben Horgan <ben.horgan@arm.com> wrote:
> From: James Morse <james.morse@arm.com>
>
> resctrl supports 'MB', as a percentage throttling of traffic somewhere
> after the L3. This is the control that mba_sc uses, so ideally the class
> chosen should be as close as possible to the counters used for mba_local.
>
> MB's percentage control should be backed either with the fixed point
> fraction MBW_MAX or bandwidth portion bitmaps. The bandwidth portion
> bitmaps is not used as its tricky to pick which bits to use to avoid
> contention, and may be possible to expose this as something other than a
> percentage in the future.
>
> CC: Zeng Heng <zengheng4@huawei.com>
> Co-developed-by: Dave Martin <Dave.Martin@arm.com>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Signed-off-by: James Morse <james.morse@arm.com>>
> Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
next prev parent reply other threads:[~2026-01-13 15:06 UTC|newest]
Thread overview: 160+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-12 16:58 [PATCH v3 00/47] arm_mpam: Add KVM/arm64 and resctrl glue code Ben Horgan
2026-01-12 16:58 ` [PATCH v3 01/47] arm_mpam: Remove duplicate linux/srcu.h header Ben Horgan
2026-01-12 17:13 ` Fenghua Yu
2026-01-15 2:12 ` Gavin Shan
2026-01-12 16:58 ` [PATCH v3 02/47] arm_mpam: Use non-atomic bitops when modifying feature bitmap Ben Horgan
2026-01-15 2:14 ` Gavin Shan
2026-01-16 11:57 ` Catalin Marinas
2026-01-16 12:02 ` Ben Horgan
2026-01-16 12:12 ` Ben Horgan
2026-01-16 15:51 ` Catalin Marinas
2026-01-12 16:58 ` [PATCH v3 03/47] arm64/sysreg: Add MPAMSM_EL1 register Ben Horgan
2026-01-15 2:16 ` Gavin Shan
2026-01-15 17:59 ` Catalin Marinas
2026-01-12 16:58 ` [PATCH v3 04/47] KVM: arm64: Preserve host MPAM configuration when changing traps Ben Horgan
2026-01-15 2:33 ` Gavin Shan
2026-01-12 16:58 ` [PATCH v3 05/47] KVM: arm64: Make MPAMSM_EL1 accesses UNDEF Ben Horgan
2026-01-15 2:34 ` Gavin Shan
2026-01-12 16:58 ` [PATCH v3 06/47] arm64: mpam: Context switch the MPAM registers Ben Horgan
2026-01-15 6:47 ` Gavin Shan
2026-01-15 12:09 ` Jonathan Cameron
2026-01-19 14:00 ` Ben Horgan
2026-01-20 1:42 ` Gavin Shan
2026-01-15 17:58 ` Catalin Marinas
2026-01-19 12:23 ` Ben Horgan
2026-01-23 14:29 ` Catalin Marinas
2026-01-26 14:30 ` Ben Horgan
2026-01-26 14:50 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 07/47] arm64: mpam: Re-initialise MPAM regs when CPU comes online Ben Horgan
2026-01-15 6:50 ` Gavin Shan
2026-01-15 18:14 ` Catalin Marinas
2026-01-19 13:38 ` Ben Horgan
2026-01-19 14:22 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 08/47] arm64: mpam: Advertise the CPUs MPAM limits to the driver Ben Horgan
2026-01-15 18:16 ` Catalin Marinas
2026-01-19 6:37 ` Gavin Shan
2026-01-19 14:49 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 09/47] arm64: mpam: Add cpu_pm notifier to restore MPAM sysregs Ben Horgan
2026-01-15 18:20 ` Catalin Marinas
2026-01-19 6:40 ` Gavin Shan
2026-01-19 6:50 ` Gavin Shan
2026-01-19 15:08 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 10/47] arm64: mpam: Initialise and context switch the MPAMSM_EL1 register Ben Horgan
2026-01-15 19:08 ` Catalin Marinas
2026-01-19 13:40 ` Ben Horgan
2026-01-19 6:51 ` Gavin Shan
2026-01-19 15:31 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 11/47] arm64: mpam: Add helpers to change a task or cpu's MPAM PARTID/PMG values Ben Horgan
2026-01-15 19:13 ` Catalin Marinas
2026-01-19 6:56 ` Gavin Shan
2026-01-19 15:47 ` Ben Horgan
2026-01-19 7:01 ` Gavin Shan
2026-01-19 15:49 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 12/47] KVM: arm64: Force guest EL1 to use user-space's partid configuration Ben Horgan
2026-01-13 14:19 ` Jonathan Cameron
2026-01-14 12:06 ` Marc Zyngier
2026-01-14 14:50 ` Ben Horgan
2026-01-15 9:05 ` Marc Zyngier
2026-01-15 11:14 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 13/47] KVM: arm64: Use kernel-space partid configuration for hypercalls Ben Horgan
2026-01-13 14:21 ` Jonathan Cameron
2026-01-13 14:35 ` Ben Horgan
2026-01-14 12:09 ` Marc Zyngier
2026-01-14 14:39 ` Ben Horgan
2026-01-14 16:50 ` Ben Horgan
2026-01-14 17:50 ` Marc Zyngier
2026-01-12 16:58 ` [PATCH v3 14/47] arm_mpam: resctrl: Add boilerplate cpuhp and domain allocation Ben Horgan
2026-01-13 16:49 ` Reinette Chatre
2026-01-19 17:20 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 15/47] arm_mpam: resctrl: Sort the order of the domain lists Ben Horgan
2026-01-12 16:58 ` [PATCH v3 16/47] arm_mpam: resctrl: Pick the caches we will use as resctrl resources Ben Horgan
2026-01-12 16:58 ` [PATCH v3 17/47] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls() Ben Horgan
2026-01-13 14:46 ` Jonathan Cameron
2026-01-13 14:58 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 18/47] arm_mpam: resctrl: Add resctrl_arch_get_config() Ben Horgan
2026-01-12 16:58 ` [PATCH v3 19/47] arm_mpam: resctrl: Implement helpers to update configuration Ben Horgan
2026-01-12 16:58 ` [PATCH v3 20/47] arm_mpam: resctrl: Add plumbing against arm64 task and cpu hooks Ben Horgan
2026-01-12 16:58 ` [PATCH v3 21/47] arm_mpam: resctrl: Add CDP emulation Ben Horgan
2026-01-12 16:58 ` [PATCH v3 22/47] arm_mpam: resctrl: Convert to/from MPAMs fixed-point formats Ben Horgan
2026-01-12 16:58 ` [PATCH v3 23/47] arm_mpam: resctrl: Add kunit test for control format conversions Ben Horgan
2026-01-12 16:58 ` [PATCH v3 24/47] arm_mpam: resctrl: Add rmid index helpers Ben Horgan
2026-01-13 14:55 ` Jonathan Cameron
2026-01-12 16:58 ` [PATCH v3 25/47] arm_mpam: resctrl: Add kunit test for rmid idx conversions Ben Horgan
2026-01-13 14:59 ` Jonathan Cameron
2026-01-12 16:58 ` [PATCH v3 26/47] arm_mpam: resctrl: Wait for cacheinfo to be ready Ben Horgan
2026-01-13 15:01 ` Jonathan Cameron
2026-01-13 15:15 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 27/47] arm_mpam: resctrl: Add support for 'MB' resource Ben Horgan
2026-01-13 15:06 ` Jonathan Cameron [this message]
2026-01-13 22:18 ` Reinette Chatre
2026-01-19 11:53 ` Gavin Shan
2026-01-19 13:53 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 28/47] arm_mpam: resctrl: Add support for csu counters Ben Horgan
2026-01-13 23:14 ` Reinette Chatre
2026-01-15 15:43 ` Ben Horgan
2026-01-15 18:54 ` Reinette Chatre
2026-01-16 10:29 ` Ben Horgan
2026-01-20 15:28 ` Peter Newman
2026-01-21 17:58 ` Reinette Chatre
2026-01-30 11:07 ` Ben Horgan
2026-01-30 11:19 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 29/47] arm_mpam: resctrl: Pick classes for use as mbm counters Ben Horgan
2026-01-15 15:49 ` Peter Newman
2026-01-19 12:04 ` James Morse
2026-01-19 12:47 ` Peter Newman
2026-01-26 16:00 ` Ben Horgan
2026-01-30 13:04 ` Peter Newman
2026-01-30 14:38 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 30/47] arm_mpam: resctrl: Pre-allocate free running monitors Ben Horgan
2026-01-13 15:10 ` Jonathan Cameron
2026-01-19 11:57 ` Gavin Shan
2026-01-19 20:27 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 31/47] arm_mpam: resctrl: Pre-allocate assignable monitors Ben Horgan
2026-01-16 10:34 ` Shaopeng Tan (Fujitsu)
2026-01-16 11:04 ` Ben Horgan
2026-01-19 20:34 ` Ben Horgan
2026-01-12 16:58 ` [PATCH v3 32/47] arm_mpam: resctrl: Add kunit test for ABMC/CDP interactions Ben Horgan
2026-01-13 15:26 ` Jonathan Cameron
2026-01-12 16:59 ` [PATCH v3 33/47] arm_mpam: resctrl: Add resctrl_arch_config_cntr() for ABMC use Ben Horgan
2026-01-12 16:59 ` [PATCH v3 34/47] arm_mpam: resctrl: Allow resctrl to allocate monitors Ben Horgan
2026-01-12 16:59 ` [PATCH v3 35/47] arm_mpam: resctrl: Add resctrl_arch_rmid_read() and resctrl_arch_reset_rmid() Ben Horgan
2026-01-12 16:59 ` [PATCH v3 36/47] arm_mpam: resctrl: Add resctrl_arch_cntr_read() & resctrl_arch_reset_cntr() Ben Horgan
2026-01-12 16:59 ` [PATCH v3 37/47] arm_mpam: resctrl: Update the rmid reallocation limit Ben Horgan
2026-01-15 10:05 ` Shaopeng Tan (Fujitsu)
2026-01-15 16:02 ` Ben Horgan
2026-01-12 16:59 ` [PATCH v3 38/47] arm_mpam: resctrl: Add empty definitions for assorted resctrl functions Ben Horgan
2026-01-12 16:59 ` [PATCH v3 39/47] arm64: mpam: Select ARCH_HAS_CPU_RESCTRL Ben Horgan
2026-01-15 19:16 ` Catalin Marinas
2026-01-12 16:59 ` [PATCH v3 40/47] arm_mpam: resctrl: Call resctrl_init() on platforms that can support resctrl Ben Horgan
2026-01-12 16:59 ` [PATCH v3 41/47] arm_mpam: Generate a configuration for min controls Ben Horgan
2026-01-13 15:39 ` Jonathan Cameron
2026-01-30 14:17 ` Ben Horgan
2026-01-31 2:30 ` Shanker Donthineni
2026-02-02 10:21 ` Ben Horgan
2026-02-02 16:34 ` Shanker Donthineni
2026-02-03 9:33 ` Ben Horgan
2026-01-12 16:59 ` [PATCH v3 42/47] arm_mpam: resctrl: Add kunit test for mbw min control generation Ben Horgan
2026-01-13 15:43 ` Jonathan Cameron
2026-01-12 16:59 ` [PATCH v3 43/47] arm_mpam: Add quirk framework Ben Horgan
2026-01-19 12:14 ` Gavin Shan
2026-01-19 20:48 ` Ben Horgan
2026-01-12 16:59 ` [PATCH v3 44/47] arm_mpam: Add workaround for T241-MPAM-1 Ben Horgan
2026-01-19 12:16 ` Gavin Shan
2026-01-19 20:54 ` Ben Horgan
2026-01-12 16:59 ` [PATCH v3 45/47] arm_mpam: Add workaround for T241-MPAM-4 Ben Horgan
2026-01-15 23:20 ` Fenghua Yu
2026-01-19 20:56 ` Ben Horgan
2026-01-29 22:14 ` Fenghua Yu
2026-01-30 12:21 ` Ben Horgan
2026-01-12 16:59 ` [PATCH v3 46/47] arm_mpam: Add workaround for T241-MPAM-6 Ben Horgan
2026-01-12 16:59 ` [PATCH v3 47/47] arm_mpam: Quirk CMN-650's CSU NRDY behaviour Ben Horgan
2026-01-19 12:18 ` Gavin Shan
2026-01-19 20:58 ` Ben Horgan
2026-01-14 6:51 ` [PATCH RESEND v2 0/45] arm_mpam: Add KVM/arm64 and resctrl glue code Zeng Heng
2026-01-15 14:37 ` Ben Horgan
2026-01-15 11:14 ` [PATCH v3 00/47] " Peter Newman
2026-01-15 11:36 ` Ben Horgan
2026-01-16 10:47 ` Shaopeng Tan (Fujitsu)
2026-01-16 11:05 ` Ben Horgan
2026-01-16 15:47 ` (subset) " Catalin Marinas
2026-01-19 1:30 ` Gavin Shan
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