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Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH 30/33] kthread: Add API to update preferred affinity on kthread runtime Message-ID: References: <20251013203146.10162-1-frederic@kernel.org> <20251013203146.10162-31-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251013203146.10162-31-frederic@kernel.org> X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: C0B79A0015 X-Stat-Signature: bx7gmsofya1phkmszmgnbmx3mfh3cgag X-Rspam-User: X-HE-Tag: 1760445352-668990 X-HE-Meta: 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 GgVP1vMV czMHam7TvqKddQS/5t+8KvWuaVHd48Tu5a6m5+QoUFsj8EJzGDnF+300fSOU27LtjWrKDxXk89dApIK1zx/N+YWiA6Iep04vBjVWnBTr3VtfLeEys8JD7EMkh9FZXBOtE+Q/X3S7+xrjQchbx2KXmD7aRz2kPxeg6Q2/hUC+duENJXfluNh+huSvOgzMK4D0cDiDU9wW+vxWaVXCDnKwcC754cNwvaxwXtT6J8S91dVedKU6UuvFDeEwOojJpoJVUnXxh X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Oct 13, 2025 at 10:31:43PM +0200, Frederic Weisbecker wrote: ... > @@ -900,6 +899,46 @@ int kthread_affine_preferred(struct task_struct *p, const struct cpumask *mask) > } > EXPORT_SYMBOL_GPL(kthread_affine_preferred); > > +/** > + * kthread_affine_preferred_update - update a kthread's preferred affinity > + * @p: thread created by kthread_create(). > + * @cpumask: new mask of CPUs (might not be online, must be possible) for @k > + * to run on. nit: @mask: ... Likewise for the documentation of kthread_affine_preferred() in a subsequent patch in this series. > + * > + * Update the cpumask of the desired kthread's affinity that was passed by > + * a previous call to kthread_affine_preferred(). This can be called either > + * before or after the first wakeup of the kthread. > + * > + * Returns 0 if the affinity has been applied. > + */ > +int kthread_affine_preferred_update(struct task_struct *p, > + const struct cpumask *mask) ...