linux-kernel - Re: [stable-6.6.y] mm: khugepaged refuses to freeze

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Message-ID: <af21afa0-2a30-478e-ac9f-6bd431af6502@kernel.org>
Date: Fri, 6 Feb 2026 10:00:25 +0100
From: "David Hildenbrand (Arm)" <david@...nel.org>
To: Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Zi Yan <ziy@...dia.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Nico Pache <npache@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....com>,
 Barry Song <baohua@...nel.org>, Lance Yang <lance.yang@...ux.dev>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [stable-6.6.y] mm: khugepaged refuses to freeze

>> I recall that there is a notifier when the system is preparing to 
>> sleep (pm notifier or something). Could we simply hook into that to 
>> tell khugepaged to suspend+resume?
> 
> Do you mean “struct dev_pm_ops”, which is used to register PM callbacks 
> for devices? However, I don’t know how to use it with a kernel thread.
> 
> Also look at how kswapd does it, kswapd also uses 
> kthread_freezable_should_stop() to check the freeze state.

Right, mimicking what kswapd does sound reasonable!

-- 
Cheers,

David