netdev - Re: [PATCH net] ipvs: Fix estimator kthreads preferred affinity

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Message-ID: <20250827104819.GA26074@horms.kernel.org>
Date: Wed, 27 Aug 2025 11:48:19 +0100
From: Simon Horman <horms@...nel.org>
To: Frederic Weisbecker <frederic@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>, Julian Anastasov <ja@....bg>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Jozsef Kadlecsik <kadlec@...filter.org>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org
Subject: Re: [PATCH net] ipvs: Fix estimator kthreads preferred affinity

On Tue, Jul 29, 2025 at 02:06:59PM +0200, Frederic Weisbecker wrote:
> The estimator kthreads' affinity are defined by sysctl overwritten
> preferences and applied through a plain call to the scheduler's affinity
> API.
> 
> However since the introduction of managed kthreads preferred affinity,
> such a practice shortcuts the kthreads core code which eventually
> overwrites the target to the default unbound affinity.
> 
> Fix this with using the appropriate kthread's API which will carry the
> desired affinity and maintain it across CPU hotplug events and CPU
> isolation constraints.
> 
> Fixes: d1a89197589c ("kthread: Default affine kthread to its preferred NUMA node")
> Signed-off-by: Frederic Weisbecker <frederic@...nel.org>

Acked-by: Simon Horman <horms@...nel.org>