linux-kernel - Re: [PATCH RFC 08/12] kcompactd: Add housekeeping notifier for dynamic mask update

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Message-ID: <96511BC8-1A04-40FA-B49F-59A5FB702C73@nvidia.com>
Date: Fri, 06 Feb 2026 10:09:31 -0500
From: Zi Yan <ziy@...dia.com>
To: Qiliang Yuan <realwujing@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Dietmar Eggemann <dietmar.eggemann@....com>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
 Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
 Thomas Gleixner <tglx@...nel.org>, "Paul E. McKenney" <paulmck@...nel.org>,
 Frederic Weisbecker <frederic@...nel.org>,
 Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
 Joel Fernandes <joelagnelf@...dia.com>,
 Josh Triplett <josh@...htriplett.org>, Boqun Feng <boqun.feng@...il.com>,
 Uladzislau Rezki <urezki@...il.com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Lai Jiangshan <jiangshanlai@...il.com>, Zqiang <qiang.zhang@...ux.dev>,
 Tejun Heo <tj@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>,
 Vlastimil Babka <vbabka@...e.cz>, Suren Baghdasaryan <surenb@...gle.com>,
 Michal Hocko <mhocko@...e.com>, Brendan Jackman <jackmanb@...gle.com>,
 Johannes Weiner <hannes@...xchg.org>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
 rcu@...r.kernel.org, linux-mm@...ck.org,
 Qiliang Yuan <yuanql9@...natelecom.cn>
Subject: Re: [PATCH RFC 08/12] kcompactd: Add housekeeping notifier for
 dynamic mask update

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@...il.com>
> Signed-off-by: Qiliang Yuan <yuanql9@...natelecom.cn>
> ---
>  mm/compaction.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>

Best Regards,
Yan, Zi