From: "Vishal Moola (Oracle)" <vishal.moola@gmail.com>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>,
linux-mm@kvack.org
Subject: Re: [PATCH 1/4] mm: Use frozen pages for page tables
Date: Thu, 13 Nov 2025 10:24:27 -0800 [thread overview]
Message-ID: <aRYiW91uAGH02UGL@fedora> (raw)
In-Reply-To: <20251113140448.1814860-2-willy@infradead.org>
On Thu, Nov 13, 2025 at 02:04:43PM +0000, Matthew Wilcox (Oracle) wrote:
> Page tables do not use the reference count. That means we can avoid
> two atomic operations (one on alloc, one on free) by allocating frozen
> pages here. This does not interfere with compaction as page tables are
> non-movable allocations.
>
> pagetable_alloc() and pagetable_free() need to move out of line to make
> this work as alloc_frozen_page() and free_frozen_page() are not exported
Nit: s/page/pages/g
> outside the mm for now. We'll want them out of line anyway soon.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
LGTM.
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
next prev parent reply other threads:[~2025-11-13 18:24 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-13 14:04 [PATCH 0/4] Convert pgtable to use frozen pages Matthew Wilcox (Oracle)
2025-11-13 14:04 ` [PATCH 1/4] mm: Use frozen pages for page tables Matthew Wilcox (Oracle)
2025-11-13 18:24 ` Vishal Moola (Oracle) [this message]
2025-11-13 19:14 ` Vishal Moola (Oracle)
2025-11-14 13:45 ` Matthew Wilcox
2025-11-14 14:31 ` Will Deacon
2025-11-17 14:38 ` kernel test robot
2025-11-18 0:44 ` Vishal Moola (Oracle)
2025-11-19 15:46 ` Chih-En Lin
2025-11-20 13:55 ` David Hildenbrand (Red Hat)
2025-11-13 14:04 ` [PATCH 2/4] mm: Account pagetable memory when allocated Matthew Wilcox (Oracle)
2025-11-13 19:39 ` Vishal Moola (Oracle)
2025-11-13 14:04 ` [PATCH 3/4] mm: Mark " Matthew Wilcox (Oracle)
2025-11-18 17:00 ` David Hildenbrand (Red Hat)
2025-11-13 14:04 ` [PATCH 4/4] pgtable: Remove uses of page->lru Matthew Wilcox (Oracle)
2025-11-20 13:56 ` David Hildenbrand (Red Hat)
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