From: Zi Yan <ziy@nvidia.com>
To: Qiliang Yuan <realwujing@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
Thomas Gleixner <tglx@kernel.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
Frederic Weisbecker <frederic@kernel.org>,
Neeraj Upadhyay <neeraj.upadhyay@kernel.org>,
Joel Fernandes <joelagnelf@nvidia.com>,
Josh Triplett <josh@joshtriplett.org>,
Boqun Feng <boqun.feng@gmail.com>,
Uladzislau Rezki <urezki@gmail.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Zqiang <qiang.zhang@linux.dev>, Tejun Heo <tj@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Brendan Jackman <jackmanb@google.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Anna-Maria Behnsen <anna-maria@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
linux-kernel@vger.kernel.org, rcu@vger.kernel.org,
linux-mm@kvack.org, Qiliang Yuan <yuanql9@chinatelecom.cn>
Subject: Re: [PATCH RFC 08/12] kcompactd: Add housekeeping notifier for dynamic mask update
Date: Fri, 06 Feb 2026 10:09:31 -0500 [thread overview]
Message-ID: <96511BC8-1A04-40FA-B49F-59A5FB702C73@nvidia.com> (raw)
In-Reply-To: <20260206-feature-dynamic_isolcpus_dhei-v1-8-00a711eb0c74@gmail.com>
On 6 Feb 2026, at 2:04, Qiliang Yuan wrote:
> The kcompactd threads should respect the housekeeping mask for kthreads
> (HK_TYPE_KTHREAD) to avoid running on isolated CPUs. Currently, they
> are created without explicit affinity constraints beyond the node
> preference.
>
> Add housekeeping_affine() to kcompactd_run() to set initial affinity,
> and register a housekeeping notifier to update kcompactd affinity
> when the HK_TYPE_KTHREAD mask is changed at runtime.
>
How about khugepaged and kswapd?
khugepaged thread is created in start_stop_khugepaged() from mm/khugepaged.c.
kswapd threads are created in kswapd_init() from mm/vmscan.c.
> Signed-off-by: Qiliang Yuan <realwujing@gmail.com>
> Signed-off-by: Qiliang Yuan <yuanql9@chinatelecom.cn>
> ---
> mm/compaction.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
Best Regards,
Yan, Zi
next prev parent reply other threads:[~2026-02-06 15:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-06 7:04 [PATCH RFC 00/12] Implementation of Dynamic Housekeeping & Enhanced Isolation (DHEI) Qiliang Yuan
2026-02-06 7:04 ` [PATCH RFC 01/12] sched/isolation: Remove __init restriction from housekeeping cores Qiliang Yuan
2026-02-06 7:04 ` [PATCH RFC 02/12] sched/isolation: Introduce reconfiguration notifier chain Qiliang Yuan
2026-02-06 7:04 ` [PATCH RFC 03/12] genirq: Implement dynamic migration for Managed IRQs Qiliang Yuan
2026-02-06 12:24 ` Thomas Gleixner
2026-02-06 7:04 ` [PATCH RFC 04/12] rcu: Sync RCU housekeeping mask on notification Qiliang Yuan
2026-02-06 7:04 ` [PATCH RFC 05/12] sched/core: Dynamic update housekeeping_cpumask(HK_TYPE_DOMAIN) Qiliang Yuan
2026-02-06 7:04 ` [PATCH RFC 06/12] watchdog: Allow runtime toggle of hardlockup detector on CPUs Qiliang Yuan
2026-02-06 7:04 ` [PATCH RFC 07/12] workqueue: Dynamic housekeeping mask update support Qiliang Yuan
2026-02-06 7:04 ` [PATCH RFC 08/12] kcompactd: Add housekeeping notifier for dynamic mask update Qiliang Yuan
2026-02-06 15:09 ` Zi Yan [this message]
2026-02-06 7:04 ` [PATCH RFC 09/12] sched/isolation: Separate housekeeping types and add sysfs interface Qiliang Yuan
2026-02-06 7:04 ` [PATCH RFC 10/12] tick/nohz: Implement dynamic nohz_full state update Qiliang Yuan
2026-02-06 7:04 ` [PATCH RFC 11/12] sched/isolation: Implement SMT sibling auto-isolation and safety check Qiliang Yuan
2026-02-06 7:04 ` [PATCH RFC 12/12] sched/isolation: Bridge isolcpus and support runtime tick offload init Qiliang Yuan
2026-02-20 19:07 ` [PATCH RFC 00/12] Implementation of Dynamic Housekeeping & Enhanced Isolation (DHEI) Joel Fernandes
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