From: Matthew Wilcox <willy@infradead.org>
To: Kiryl Shutsemau <kas@kernel.org>
Cc: lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org,
x86@kernel.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Mike Rapoport <rppt@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Usama Arif <usama.arif@linux.dev>
Subject: Re: [LSF/MM/BPF TOPIC] 64k (or 16k) base page size on x86
Date: Thu, 19 Feb 2026 17:47:22 +0000 [thread overview]
Message-ID: <aZdMqub5RsukLvnv@casper.infradead.org> (raw)
In-Reply-To: <aZcmlIF4bmG0twkp@thinkstation>
On Thu, Feb 19, 2026 at 03:08:51PM +0000, Kiryl Shutsemau wrote:
> On x86, page tables are allocated from the buddy allocator and if PG_SIZE
> is greater than 4 KB, we need a way to pack multiple page tables into a
> single page. We could use the slab allocator for this, but it would
> require relocating the page-table metadata out of struct page.
Have you looked at the s390/ppc implementations (yes, they're different,
no, that sucks)? slab seems like the wrong approach to me.
There's a third approach that I've never looked at which is to allocate
the larger size, then just use it for N consecutive entries.
next prev parent reply other threads:[~2026-02-19 17:47 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-19 15:08 Kiryl Shutsemau
2026-02-19 15:17 ` Peter Zijlstra
2026-02-19 15:20 ` Peter Zijlstra
2026-02-19 15:27 ` Kiryl Shutsemau
2026-02-19 15:33 ` Pedro Falcato
2026-02-19 15:50 ` Kiryl Shutsemau
2026-02-19 15:53 ` David Hildenbrand (Arm)
2026-02-19 19:31 ` Pedro Falcato
2026-02-19 15:39 ` David Hildenbrand (Arm)
2026-02-19 15:54 ` Kiryl Shutsemau
2026-02-19 16:09 ` David Hildenbrand (Arm)
2026-02-20 2:55 ` Zi Yan
2026-02-19 17:09 ` Kiryl Shutsemau
2026-02-20 10:24 ` David Hildenbrand (Arm)
2026-02-20 12:07 ` Kiryl Shutsemau
2026-02-20 16:30 ` David Hildenbrand (Arm)
2026-02-20 19:33 ` Kalesh Singh
2026-02-19 23:24 ` Kalesh Singh
2026-02-20 12:10 ` Kiryl Shutsemau
2026-02-20 19:21 ` Kalesh Singh
2026-02-19 17:08 ` Dave Hansen
2026-02-19 22:05 ` Kiryl Shutsemau
2026-02-20 3:28 ` Liam R. Howlett
2026-02-20 12:33 ` Kiryl Shutsemau
2026-02-20 15:17 ` Liam R. Howlett
2026-02-20 15:50 ` Kiryl Shutsemau
2026-02-19 17:30 ` Dave Hansen
2026-02-19 22:14 ` Kiryl Shutsemau
2026-02-19 22:21 ` Dave Hansen
2026-02-19 17:47 ` Matthew Wilcox [this message]
2026-02-19 22:26 ` Kiryl Shutsemau
2026-02-20 9:04 ` David Laight
2026-02-20 12:12 ` Kiryl Shutsemau
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