Re: [RFC PATCH 0/6] mm: pass alloc_flags through folio, filemap, and bulk allocators

[Gregory Price]

On Wed, Sep 23, 2026 at 10:42:07PM +0100, Matthew Wilcox wrote:
> On Wed, Sep 23, 2026 at 05:10:34PM -0400, Gregory Price wrote:
> > The folio, filemap, and bulk allocation interfaces currently hard-code
> > ALLOC_DEFAULT before reaching the page allocator. Multiple MM series
> > need to select allocator behavior through these paths, so pulling these
> > changes out ahead helps both series avoid conflicts.
> 
> I really think this 'expose ALLOC flags' idea is wrong.

It is mm/ internal only - to be clear.

It's also already been partially exposed, this just brings the rest of
the interfaces with it.

There are use cases.  I initially only wanted to expose a zonelist
selection rather than alloc flags, but given ALLOC_UNMAPPED was
in-flight it seemed better not to propose different solutions when there
are existing possibilities.

I'm open to options.

~Gregory