From: Thomas Gleixner <tglx@kernel.org>
To: Chen Yu <yu.c.chen@intel.com>,
tony.luck@intel.com, reinette.chatre@intel.com
Cc: x86@kernel.org, linux-kernel@vger.kernel.org, bp@alien8.de,
mingo@redhat.com, dave.hansen@linux.intel.com, hpa@zytor.com,
dave.martin@arm.com, james.morse@arm.com, fenghuay@nvidia.com,
babu.moger@amd.com, anil.keshavamurthy@broadcom.com
Subject: Re: [PATCH v3 6/6] x86/resctrl: Add support for L3 occupancy monitoring via RMID MMIO read
Date: Mon, 08 Jun 2026 10:33:28 +0200 [thread overview]
Message-ID: <87y0gp4ejr.ffs@fw13> (raw)
In-Reply-To: <8d3ae8b7f66f4ed2765cbe9c18d1d831ed28b894.1780710620.git.yu.c.chen@intel.com>
On Sat, Jun 06 2026 at 10:38, Chen Yu wrote:
> The CMRC (Cache Monitoring Registers for CPU Agents Description)
> ACPI sub-table provides the MMIO address used to read the LLC
> occupancy counter for each RMID. When ERDT is enabled on the
> platform, use this MMIO interface instead of the legacy MSR read
> to obtain the L3 occupancy value.
>
> Introduce erdt_mon_read(), a helper that retrieves monitoring
> data for a given RMID and event ID from an ERDT domain. Initial
> support is added for the L3 occupancy monitoring event
> (QOS_L3_OCCUP_EVENT_ID).
>
> If the platform supports ERDT, CMRC-based MMIO access is used by
> default. If ERDT is unavailable, the implementation is to use
> MSR-based operations.
>
> Suggested-by: Tony Luck <tony.luck@intel.com>
> Co-developed-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
> Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
> Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Reviewed-by: Thomas Gleixner <tglx@kernel.org>
prev parent reply other threads:[~2026-06-08 8:33 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-06 2:31 [PATCH v3 0/6] Introduce MMIO-based CMT access for Enhanced RDT Chen Yu
2026-06-06 2:32 ` [PATCH v3 1/6] x86/resctrl: Parse ACPI ERDT table and map RMDD domains by L3 cache ID Chen Yu
2026-06-08 8:59 ` Thomas Gleixner
2026-06-08 11:20 ` Chen, Yu C
2026-06-06 2:33 ` [PATCH v3 2/6] x86/resctrl: Parse ACPI CMRC table Chen Yu
2026-06-08 8:30 ` Thomas Gleixner
2026-06-06 2:35 ` [PATCH v3 3/6] x86/resctrl: Rename prev_msr to prev_mon_val Chen Yu
2026-06-08 8:32 ` Thomas Gleixner
2026-06-06 2:38 ` [PATCH v3 4/6] x86/resctrl: Refactor the monitor read function Chen Yu
2026-06-06 2:38 ` [PATCH v3 5/6] fs/resctrl: Do not invoke smp_processor_id() in preemptible context Chen Yu
2026-06-08 8:36 ` Thomas Gleixner
2026-06-08 11:26 ` Chen, Yu C
2026-06-08 15:10 ` Reinette Chatre
2026-06-08 16:45 ` Chen, Yu C
2026-06-08 15:32 ` Luck, Tony
2026-06-08 16:54 ` Chen, Yu C
2026-06-06 2:38 ` [PATCH v3 6/6] x86/resctrl: Add support for L3 occupancy monitoring via RMID MMIO read Chen Yu
2026-06-08 8:33 ` Thomas Gleixner [this message]
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