linux-kernel - Re: [PATCH v3 10/11] mm/vmalloc: Enter lazy mmu mode while manipulating vmalloc ptes

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Message-ID: <Z-7z8MXWJDz3kx2j@arm.com>
Date: Thu, 3 Apr 2025 21:47:44 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Ryan Roberts <ryan.roberts@....com>
Cc: Will Deacon <will@...nel.org>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	David Hildenbrand <david@...hat.com>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Mark Rutland <mark.rutland@....com>,
	Anshuman Khandual <anshuman.khandual@....com>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Kevin Brodsky <kevin.brodsky@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 10/11] mm/vmalloc: Enter lazy mmu mode while
 manipulating vmalloc ptes

On Tue, Mar 04, 2025 at 03:04:40PM +0000, Ryan Roberts wrote:
> Wrap vmalloc's pte table manipulation loops with
> arch_enter_lazy_mmu_mode() / arch_leave_lazy_mmu_mode(). This provides
> the arch code with the opportunity to optimize the pte manipulations.
> 
> Note that vmap_pfn() already uses lazy mmu mode since it delegates to
> apply_to_page_range() which enters lazy mmu mode for both user and
> kernel mappings.
> 
> These hooks will shortly be used by arm64 to improve vmalloc
> performance.
> 
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>