linux-kernel - Re: [RFC PATCH v8 3/7] mm/filemap: Add mempolicy support to the filemap layer

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Message-ID: <7f917d34-5724-41ff-b904-0ad4598db3b3@suse.cz>
Date: Thu, 19 Jun 2025 17:08:32 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Shivank Garg <shivankg@....com>, seanjc@...gle.com, david@...hat.com,
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Subject: Re: [RFC PATCH v8 3/7] mm/filemap: Add mempolicy support to the
 filemap layer

On 6/18/25 13:29, Shivank Garg wrote:
> From: Shivansh Dhiman <shivansh.dhiman@....com>
> 
> Add NUMA mempolicy support to the filemap allocation path by introducing
> new APIs that take a mempolicy argument:
> - filemap_grab_folio_mpol()
> - filemap_alloc_folio_mpol()
> - __filemap_get_folio_mpol()
> 
> These APIs allow callers to specify a NUMA policy during page cache
> allocations, enabling fine-grained control over memory placement. This is
> particularly needed by KVM when using guest-memfd memory backends, where
> the guest memory needs to be allocated according to the NUMA policy
> specified by VMM.
> 
> The existing non-mempolicy APIs remain unchanged and continue to use the
> default allocation behavior.
> 
> Signed-off-by: Shivansh Dhiman <shivansh.dhiman@....com>
> Co-developed-by: Shivank Garg <shivankg@....com>
> Signed-off-by: Shivank Garg <shivankg@....com>

I think __filemap_get_folio() could become a static inline wrapper for
__filemap_get_folio_mpol in pagemap.h.
Otherwise,

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