linux-kernel - Re: [PATCH] mm/vma: Do not register private-anon mappings with khugepaged during mmap

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Message-Id: <20250305223856.bc1a0c90339cf0d353e8be34@linux-foundation.org>
Date: Wed, 5 Mar 2025 22:38:56 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Dev Jain <dev.jain@....com>
Cc: Liam.Howlett@...cle.com, lorenzo.stoakes@...cle.com, vbabka@...e.cz,
 jannh@...gle.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 ryan.roberts@....com, anshuman.khandual@....com, aneesh.kumar@...nel.org,
 yang@...amperecomputing.com, david@...hat.com, willy@...radead.org,
 hughd@...gle.com, ziy@...dia.com
Subject: Re: [PATCH] mm/vma: Do not register private-anon mappings with
 khugepaged during mmap

On Thu,  6 Mar 2025 12:00:37 +0530 Dev Jain <dev.jain@....com> wrote:

> We already are registering private-anon VMAs with khugepaged during fault
> time, in do_huge_pmd_anonymous_page(). Commit "register suitable readonly
> file vmas for khugepaged" moved the khugepaged registration logic from
> shmem_mmap to the generic mmap path. Make this logic specific for non-anon
> mappings.

Please fully describe the userspace-visible effects of this bug.

> Fixes: 613bec092fe7 ("mm: mmap: register suitable readonly file vmas for khugepaged")
> Signed-off-by: Dev Jain <dev.jain@....com>

Thanks, I'll add cc:stable.