From: Catalin Marinas <catalin.marinas@arm.com>
To: Ryan Roberts <ryan.roberts@arm.com>
Cc: Will Deacon <will@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@redhat.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Yang Shi <yang@os.amperecomputing.com>,
Ard Biesheuvel <ardb@kernel.org>, Dev Jain <dev.jain@arm.com>,
scott@os.amperecomputing.com, cl@gentwo.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v7 6/6] arm64: mm: Optimize linear_map_split_to_ptes()
Date: Thu, 4 Sep 2025 18:00:22 +0100 [thread overview]
Message-ID: <aLnFpndf-XikPPFf@arm.com> (raw)
In-Reply-To: <20250829115250.2395585-7-ryan.roberts@arm.com>
On Fri, Aug 29, 2025 at 12:52:47PM +0100, Ryan Roberts wrote:
> When splitting kernel leaf mappings, either via
> split_kernel_leaf_mapping_locked() or linear_map_split_to_ptes(),
> previously a leaf mapping was always split to the next size down. e.g.
> pud -> contpmd -> pmd -> contpte -> pte. But for
> linear_map_split_to_ptes() we can avoid the contpmd and contpte states
> because we know we want to split all the way down to ptes.
>
> This avoids visiting all the ptes in a table if it was created by
> splitting a pmd, which is noticible on systems with a lot of memory.
>
> Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2025-09-04 17:00 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-29 11:52 [PATCH v7 0/6] arm64: support FEAT_BBM level 2 and large block mapping when rodata=full Ryan Roberts
2025-08-29 11:52 ` [PATCH v7 1/6] arm64: Enable permission change on arm64 kernel block mappings Ryan Roberts
[not found] ` <7705c29b-4f08-4b56-aab3-024795ee9124@huawei.com>
2025-09-04 11:06 ` Ryan Roberts
[not found] ` <a985c9f0-1561-45d7-860f-2717a0a72d9e@huawei.com>
2025-09-04 13:21 ` Ryan Roberts
2025-08-29 11:52 ` [PATCH v7 2/6] arm64: cpufeature: add AmpereOne to BBML2 allow list Ryan Roberts
2025-08-29 22:08 ` Yang Shi
2025-09-04 11:07 ` Ryan Roberts
2025-09-03 17:24 ` Catalin Marinas
2025-09-04 0:49 ` Yang Shi
2025-08-29 11:52 ` [PATCH v7 3/6] arm64: mm: support large block mapping when rodata=full Ryan Roberts
2025-09-03 19:15 ` Catalin Marinas
2025-09-04 0:52 ` Yang Shi
2025-09-04 11:09 ` Ryan Roberts
2025-09-04 11:15 ` Ryan Roberts
2025-09-04 14:57 ` Yang Shi
2025-08-29 11:52 ` [PATCH v7 4/6] arm64: mm: Optimize split_kernel_leaf_mapping() Ryan Roberts
2025-08-29 22:11 ` Yang Shi
2025-09-03 19:20 ` Catalin Marinas
2025-09-04 11:09 ` Ryan Roberts
2025-08-29 11:52 ` [PATCH v7 5/6] arm64: mm: split linear mapping if BBML2 unsupported on secondary CPUs Ryan Roberts
2025-09-04 16:59 ` Catalin Marinas
2025-09-04 17:54 ` Yang Shi
2025-08-29 11:52 ` [PATCH v7 6/6] arm64: mm: Optimize linear_map_split_to_ptes() Ryan Roberts
2025-08-29 22:27 ` Yang Shi
2025-09-04 11:10 ` Ryan Roberts
2025-09-04 14:58 ` Yang Shi
2025-09-04 17:00 ` Catalin Marinas [this message]
2025-09-01 5:04 ` [PATCH v7 0/6] arm64: support FEAT_BBM level 2 and large block mapping when rodata=full Dev Jain
2025-09-01 8:03 ` Ryan Roberts
2025-09-03 0:21 ` Yang Shi
2025-09-03 0:50 ` Yang Shi
2025-09-04 13:14 ` Ryan Roberts
2025-09-04 13:16 ` Ryan Roberts
2025-09-04 17:47 ` Yang Shi
2025-09-04 21:49 ` Yang Shi
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