linux-kernel - Re: [PATCH v23 00/19] Add support for Sub-NUMA cluster (SNC) systems

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Date: Mon, 1 Jul 2024 09:24:02 -0500
From: "Moger, Babu" <babu.moger@....com>
To: Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
 Reinette Chatre <reinette.chatre@...el.com>,
 Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
 Peter Newman <peternewman@...gle.com>, James Morse <james.morse@....com>,
 Drew Fustini <dfustini@...libre.com>, Dave Martin <Dave.Martin@....com>,
 "bp@...en8.de" <bp@...en8.de>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH v23 00/19] Add support for Sub-NUMA cluster (SNC) systems

Tested the series on AMD systems and ran few basic tests. Everything looks
good.  Thanks.

Tested-by: Babu Moger <babu.moger@....com>


On 6/28/24 16:56, Tony Luck wrote:
> This series based on top of tip x86/cache commit f385f0246394
> ("x86/resctrl: Replace open coded cacheinfo searches")
> 
> The Sub-NUMA cluster feature on some Intel processors partitions the CPUs
> that share an L3 cache into two or more sets. This plays havoc with the
> Resource Director Technology (RDT) monitoring features.  Prior to this
> patch Intel has advised that SNC and RDT are incompatible.
> 
> Some of these CPUs support an MSR that can partition the RMID counters
> in the same way. This allows monitoring features to be used. Legacy
> monitoring files provide the sum of counters from each SNC node for
> backwards compatibility. Additional  files per SNC node provide details
> per node.
> 
> Memory bandwidth allocation features continue to operate at
> the scope of the L3 cache.
> 
> L3 cache occupancy and allocation operate on the portion of
> L3 cache available for each SNC node.
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> 
> ---
> Changes since v21: https://lore.kernel.org/all/20240627203856.66628-1-tony.luck@intel.com/
> 
> No net code changes (final version v23 == v22)
> 
> * Patch 9 split into two (9 & 10 in this series) Added Reinette's Reviewed-by tag to both.
> * Added Reinette's Reviewed-by tag to parts 15 & 16 (were 14, 15 in v22)
> 
> Tony Luck (19):
>   x86/resctrl: Prepare for new domain scope
>   x86/resctrl: Prepare to split rdt_domain structure
>   x86/resctrl: Prepare for different scope for control/monitor
>     operations
>   x86/resctrl: Split the rdt_domain and rdt_hw_domain structures
>   x86/resctrl: Add node-scope to the options for feature scope
>   x86/resctrl: Introduce snc_nodes_per_l3_cache
>   x86/resctrl: Block use of mba_MBps mount option on Sub-NUMA Cluster
>     (SNC) systems
>   x86/resctrl: Prepare for new Sub-NUMA Cluster (SNC) monitor files
>   x86/resctrl: Add a new field to struct rmid_read for summation of
>     domains
>   x86/resctrl: Initialize on-stack struct rmid_read instances
>   x86/resctrl: Refactor mkdir_mondata_subdir() with a helper function
>   x86/resctrl: Allocate a new field in union mon_data_bits
>   x86/resctrl: Create Sub-NUMA Cluster (SNC) monitor files
>   x86/resctrl: Handle removing directories in Sub-NUMA Cluster (SNC)
>     mode
>   x86/resctrl: Fill out rmid_read structure for smp_call*() to read a
>     counter
>   x86/resctrl: Make __mon_event_count() handle sum domains
>   x86/resctrl: Enable shared RMID mode on Sub-NUMA Cluster (SNC) systems
>   x86/resctrl: Sub-NUMA Cluster (SNC) detection
>   x86/resctrl: Update documentation with Sub-NUMA cluster changes
> 
>  Documentation/arch/x86/resctrl.rst        |  27 ++
>  include/linux/resctrl.h                   |  88 ++++--
>  arch/x86/include/asm/msr-index.h          |   1 +
>  arch/x86/kernel/cpu/resctrl/internal.h    | 108 +++++---
>  arch/x86/kernel/cpu/resctrl/core.c        | 312 ++++++++++++++++------
>  arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  89 +++---
>  arch/x86/kernel/cpu/resctrl/monitor.c     | 256 +++++++++++++++---
>  arch/x86/kernel/cpu/resctrl/pseudo_lock.c |  27 +-
>  arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 281 ++++++++++++-------
>  9 files changed, 865 insertions(+), 324 deletions(-)
> 
> 
> base-commit: f385f024639431bec3e70c33cdbc9563894b3ee5

-- 
Thanks
Babu Moger