linux-kernel - [PATCH v2 0/2] Fix NUMA sched domain build errors for GNR and CWF

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Message-Id: <cover.1757097030.git.tim.c.chen@linux.intel.com>
Date: Fri,  5 Sep 2025 11:36:23 -0700
From: Tim Chen <tim.c.chen@...ux.intel.com>
To: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Tim Chen <tim.c.chen@...el.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Libo Chen <libo.chen@...cle.com>,
	Abel Wu <wuyun.abel@...edance.com>,
	Len Brown <len.brown@...el.com>,
	linux-kernel@...r.kernel.org,
	Chen Yu <yu.c.chen@...el.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	"Gautham R . Shenoy" <gautham.shenoy@....com>,
	Zhao Liu <zhao1.liu@...el.com>,
	Vinicius Costa Gomes <vinicius.gomes@...el.com>,
	Arjan Van De Ven <arjan.van.de.ven@...el.com>
Subject: [PATCH v2 0/2] Fix NUMA sched domain build errors for GNR and CWF

While testing Granite Rapids (GNR) and Clearwater Forest (CWF) in
SNc-3 mode, we encountered sched domain build errors reported in dmesg.
Asymmetric node distances from local node to to nodes in remote package
was not expected by the scheduler domain code and also led to excessive
number of sched domain hierarchy levels.

Simplify the remote node distances for the purpose of building sched
domains for GNR and CWF to fix the domain build errors and reduce
the number of NUMA sched domain levels.

Changes in v2:
- Allow modification of NUMA distances by architecture to be the
  sched domain NUMA distances for building sched domains to
  simplify NUMA domains.
  Maintain separate NUMA distances for the purpose of building
  sched domains from actual NUMA distances.
- Use average remote node distance as the distance to nodes in remote
  packages for GNR and CWF.
- Remove the original fix for topology_span_sane() that's superseded
  by better fix from Pratek.
  https://lore.kernel.org/lkml/175688671425.1920.13690753997160836570.tip-bot2@tip-bot2/.
- Link to v1: https://lore.kernel.org/lkml/cover.1755893468.git.tim.c.chen@linux.intel.com/


Tim Chen (2):
  sched: Create architecture specific sched domain distances
  sched: Fix sched domain build error for GNR, CWF in SNC-3 mode

 arch/x86/kernel/smpboot.c      |  28 ++++++++
 include/linux/sched/topology.h |   2 +
 kernel/sched/topology.c        | 118 ++++++++++++++++++++++++++++-----
 3 files changed, 131 insertions(+), 17 deletions(-)

-- 
2.32.0