From: Catalin Marinas <catalin.marinas@arm.com>
To: Ryan Roberts <ryan.roberts@arm.com>
Cc: Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Matthew Wilcox <willy@infradead.org>,
Mark Rutland <mark.rutland@arm.com>,
David Hildenbrand <david@redhat.com>,
Kefeng Wang <wangkefeng.wang@huawei.com>,
John Hubbard <jhubbard@nvidia.com>, Zi Yan <ziy@nvidia.com>,
Barry Song <21cnbao@gmail.com>,
Alistair Popple <apopple@nvidia.com>,
Yang Shi <shy828301@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
linux-arm-kernel@lists.infradead.org, x86@kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 14/18] arm64/mm: Implement new [get_and_]clear_full_ptes() batch APIs
Date: Fri, 16 Feb 2024 12:30:48 +0000 [thread overview]
Message-ID: <Zc9VeMJpdpJG9LsH@arm.com> (raw)
In-Reply-To: <20240215103205.2607016-15-ryan.roberts@arm.com>
On Thu, Feb 15, 2024 at 10:32:01AM +0000, Ryan Roberts wrote:
> Optimize the contpte implementation to fix some of the
> exit/munmap/dontneed performance regression introduced by the initial
> contpte commit. Subsequent patches will solve it entirely.
>
> During exit(), munmap() or madvise(MADV_DONTNEED), mappings must be
> cleared. Previously this was done 1 PTE at a time. But the core-mm
> supports batched clear via the new [get_and_]clear_full_ptes() APIs. So
> let's implement those APIs and for fully covered contpte mappings, we no
> longer need to unfold the contpte. This significantly reduces unfolding
> operations, reducing the number of tlbis that must be issued.
>
> Tested-by: John Hubbard <jhubbard@nvidia.com>
> Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2024-02-16 12:30 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-15 10:31 [PATCH v6 00/18] Transparent Contiguous PTEs for User Mappings Ryan Roberts
2024-02-15 10:31 ` [PATCH v6 01/18] mm: Clarify the spec for set_ptes() Ryan Roberts
2024-02-15 10:31 ` [PATCH v6 02/18] mm: thp: Batch-collapse PMD with set_ptes() Ryan Roberts
2024-02-15 10:31 ` [PATCH v6 03/18] mm: Introduce pte_advance_pfn() and use for pte_next_pfn() Ryan Roberts
2024-02-15 10:40 ` David Hildenbrand
2024-02-15 10:31 ` [PATCH v6 04/18] arm64/mm: Convert pte_next_pfn() to pte_advance_pfn() Ryan Roberts
2024-02-15 10:42 ` David Hildenbrand
2024-02-15 11:17 ` Mark Rutland
2024-02-15 18:27 ` Catalin Marinas
2024-02-15 10:31 ` [PATCH v6 05/18] x86/mm: " Ryan Roberts
2024-02-15 10:43 ` David Hildenbrand
2024-02-15 10:31 ` [PATCH v6 06/18] mm: Tidy up pte_next_pfn() definition Ryan Roberts
2024-02-15 10:43 ` David Hildenbrand
2024-02-15 10:31 ` [PATCH v6 07/18] arm64/mm: Convert READ_ONCE(*ptep) to ptep_get(ptep) Ryan Roberts
2024-02-15 11:18 ` Mark Rutland
2024-02-15 18:34 ` Catalin Marinas
2024-02-15 10:31 ` [PATCH v6 08/18] arm64/mm: Convert set_pte_at() to set_ptes(..., 1) Ryan Roberts
2024-02-15 11:19 ` Mark Rutland
2024-02-15 18:34 ` Catalin Marinas
2024-02-15 10:31 ` [PATCH v6 09/18] arm64/mm: Convert ptep_clear() to ptep_get_and_clear() Ryan Roberts
2024-02-15 11:20 ` Mark Rutland
2024-02-15 18:35 ` Catalin Marinas
2024-02-15 10:31 ` [PATCH v6 10/18] arm64/mm: New ptep layer to manage contig bit Ryan Roberts
2024-02-15 11:23 ` Mark Rutland
2024-02-15 19:21 ` Catalin Marinas
2024-02-15 10:31 ` [PATCH v6 11/18] arm64/mm: Split __flush_tlb_range() to elide trailing DSB Ryan Roberts
2024-02-15 11:24 ` Mark Rutland
2024-02-15 19:22 ` Catalin Marinas
2024-02-15 10:31 ` [PATCH v6 12/18] arm64/mm: Wire up PTE_CONT for user mappings Ryan Roberts
2024-02-15 11:27 ` Mark Rutland
2024-02-16 12:25 ` Catalin Marinas
2024-02-16 12:53 ` Ryan Roberts
2024-02-16 16:56 ` Catalin Marinas
2024-02-16 19:54 ` John Hubbard
2024-02-20 19:50 ` Ryan Roberts
2024-02-19 15:18 ` Catalin Marinas
2024-02-20 19:58 ` Ryan Roberts
2024-02-15 10:32 ` [PATCH v6 13/18] arm64/mm: Implement new wrprotect_ptes() batch API Ryan Roberts
2024-02-15 11:28 ` Mark Rutland
2024-02-16 12:30 ` Catalin Marinas
2024-02-15 10:32 ` [PATCH v6 14/18] arm64/mm: Implement new [get_and_]clear_full_ptes() batch APIs Ryan Roberts
2024-02-15 11:28 ` Mark Rutland
2024-02-16 12:30 ` Catalin Marinas [this message]
2024-02-15 10:32 ` [PATCH v6 15/18] mm: Add pte_batch_hint() to reduce scanning in folio_pte_batch() Ryan Roberts
2024-02-15 10:32 ` [PATCH v6 16/18] arm64/mm: Implement pte_batch_hint() Ryan Roberts
2024-02-16 12:34 ` Catalin Marinas
2024-02-15 10:32 ` [PATCH v6 17/18] arm64/mm: __always_inline to improve fork() perf Ryan Roberts
2024-02-16 12:34 ` Catalin Marinas
2024-02-15 10:32 ` [PATCH v6 18/18] arm64/mm: Automatically fold contpte mappings Ryan Roberts
2024-02-15 11:30 ` Mark Rutland
2024-02-16 12:35 ` Catalin Marinas
2024-06-24 14:30 ` Kefeng Wang
2024-06-24 15:56 ` Ryan Roberts
2024-06-25 3:16 ` Kefeng Wang
2024-06-25 7:23 ` Baolin Wang
2024-06-25 11:40 ` Ryan Roberts
2024-06-25 12:37 ` Baolin Wang
2024-06-25 12:41 ` Ryan Roberts
2024-06-25 13:06 ` Matthew Wilcox
2024-06-25 13:41 ` Ryan Roberts
2024-06-25 14:06 ` Matthew Wilcox
2024-06-25 14:45 ` Ryan Roberts
2024-06-25 12:23 ` Kefeng Wang
2024-02-15 11:36 ` [PATCH v6 00/18] Transparent Contiguous PTEs for User Mappings Mark Rutland
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