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

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Message-ID: <aFQ0v0DfWgUvqK6L@casper.infradead.org>
Date: Thu, 19 Jun 2025 17:03:11 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Shivank Garg <shivankg@....com>
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Subject: Re: [RFC PATCH v8 3/7] mm/filemap: Add mempolicy support to the
 filemap layer

On Wed, Jun 18, 2025 at 11:29:31AM +0000, 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()

You don't use these APIs in this series, so I can't evaludate whether
any of my suggestiosn for improving this patch would actually work.
NACK.  Introduce the APIs *with a user*.  Come on, this isn't a new
requirement.