linux-kernel - Re: [PATCH v5] page_alloc: allow migration of smaller hugepages during contig

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Message-ID: <aURtJj-krJxqLefP@gourry-fedora-PF4VCD3F>
Date: Thu, 18 Dec 2025 16:07:50 -0500
From: Gregory Price <gourry@...rry.net>
To: Zi Yan <ziy@...dia.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, kernel-team@...a.com,
	akpm@...ux-foundation.org, vbabka@...e.cz, surenb@...gle.com,
	mhocko@...e.com, jackmanb@...gle.com, hannes@...xchg.org,
	richard.weiyang@...il.com, osalvador@...e.de, rientjes@...gle.com,
	david@...hat.com, joshua.hahnjy@...il.com, fvdl@...gle.com
Subject: Re: [PATCH v5] page_alloc: allow migration of smaller hugepages
 during contig_alloc

On Thu, Dec 18, 2025 at 02:45:37PM -0500, Zi Yan wrote:
> On 18 Dec 2025, at 14:08, Gregory Price wrote:
> 
> Why not do hugetlb search when non-hugetlb fails in pfn_range_valid_contig()
> and give hugetlb_search result in an input parameter? Something like
> 

Short discussion with Johannes - it's not worth trying to do any kind of
filtering, but we can at least optimize for the case where we don't
actually find any hugetlb regions (preventing a retry for no reason).

So I'll ship a v6 with a mild improvement.

~Gregory