linux-kernel - Re: [PATCH v2 1/4] mm: ksm: have KSM VMA checks not require a VMA pointer

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Message-ID: <4bead2e4-a00e-447d-a117-934190858673@suse.cz>
Date: Thu, 29 May 2025 15:59:29 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Alexander Viro <viro@...iv.linux.org.uk>,
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
 "Liam R . Howlett" <Liam.Howlett@...cle.com>, Jann Horn <jannh@...gle.com>,
 Pedro Falcato <pfalcato@...e.de>, David Hildenbrand <david@...hat.com>,
 Xu Xin <xu.xin16@....com.cn>, Chengming Zhou <chengming.zhou@...ux.dev>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, Stefan Roesch <shr@...kernel.io>
Subject: Re: [PATCH v2 1/4] mm: ksm: have KSM VMA checks not require a VMA
 pointer

On 5/21/25 20:20, Lorenzo Stoakes wrote:
> In subsequent commits we are going to determine KSM eligibility prior to a
> VMA being constructed, at which point we will of course not yet have access
> to a VMA pointer.
> 
> It is trivial to boil down the check logic to be parameterised on
> mm_struct, file and VMA flags, so do so.
> 
> As a part of this change, additionally expose and use file_is_dax() to
> determine whether a file is being mapped under a DAX inode.
> 
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> Acked-by: David Hildenbrand <david@...hat.com>
> Reviewed-by: Chengming Zhou <chengming.zhou@...ux.dev>

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>