linux-kernel - Re: [PATCH 4/4] mm: khugepaged: set to next mm direct when mm has MMF_DISABLE_THP

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Message-ID: <11025f1c-88d3-41a9-8290-21a9565e9bc3@kernel.org>
Date: Thu, 18 Dec 2025 10:33:16 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Vernon Yang <vernon2gm@...il.com>, akpm@...ux-foundation.org,
 lorenzo.stoakes@...cle.com
Cc: ziy@...dia.com, npache@...hat.com, baohua@...nel.org,
 lance.yang@...ux.dev, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 Vernon Yang <yanglincheng@...inos.cn>
Subject: Re: [PATCH 4/4] mm: khugepaged: set to next mm direct when mm has
 MMF_DISABLE_THP_COMPLETELY

On 12/15/25 10:04, Vernon Yang wrote:
> When an mm with the MMF_DISABLE_THP_COMPLETELY flag is detected during
> scanning, directly set khugepaged_scan.mm_slot to the next mm_slot,
> reduce redundant operation.

That conceptually makes sense to me. How much does that safe in 
practice? Do you have some performance numbers for processes with rather 
large number of VMAs?

-- 
Cheers

David