linux-kernel - Re: [PATCH v2 01/13] mm/Kconfig: CONFIG_PGTABLE_HAS_HUGE

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Message-ID: <20240115173737.GO734935@nvidia.com>
Date: Mon, 15 Jan 2024 13:37:37 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: peterx@...hat.com
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	James Houghton <jthoughton@...gle.com>,
	David Hildenbrand <david@...hat.com>,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	Yang Shi <shy828301@...il.com>, linux-riscv@...ts.infradead.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
	Rik van Riel <riel@...riel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	Mike Rapoport <rppt@...nel.org>, John Hubbard <jhubbard@...dia.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Michael Ellerman <mpe@...erman.id.au>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Andrew Jones <andrew.jones@...ux.dev>,
	linuxppc-dev@...ts.ozlabs.org,
	Mike Kravetz <mike.kravetz@...cle.com>,
	Muchun Song <muchun.song@...ux.dev>,
	linux-arm-kernel@...ts.infradead.org,
	Christoph Hellwig <hch@...radead.org>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2 01/13] mm/Kconfig: CONFIG_PGTABLE_HAS_HUGE_LEAVES

On Wed, Jan 03, 2024 at 05:14:11PM +0800, peterx@...hat.com wrote:
> From: Peter Xu <peterx@...hat.com>
> 
> Introduce a config option that will be selected as long as huge leaves are
> involved in pgtable (thp or hugetlbfs).  It would be useful to mark any
> code with this new config that can process either hugetlb or thp pages in
> any level that is higher than pte level.
> 
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  mm/Kconfig | 3 +++
>  1 file changed, 3 insertions(+)

So you mean anything that supports page table entires > PAGE_SIZE ?

Makes sense to me, though maybe add a comment in the kconfig?

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason