linux-kernel - Re: [PATCH v3 0/3] Speed up boot with faster linear map creation

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Message-Id: <171293670589.3659902.6442840474459477952.b4-ty@kernel.org>
Date: Fri, 12 Apr 2024 17:06:41 +0100
From: Will Deacon <will@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ard Biesheuvel <ardb@...nel.org>,
	David Hildenbrand <david@...hat.com>,
	Donald Dutile <ddutile@...hat.com>,
	Eric Chanudet <echanude@...hat.com>,
	Ryan Roberts <ryan.roberts@....com>
Cc: kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/3] Speed up boot with faster linear map creation

On Fri, 12 Apr 2024 14:19:05 +0100, Ryan Roberts wrote:
> It turns out that creating the linear map can take a significant proportion of
> the total boot time, especially when rodata=full. And most of the time is spent
> waiting on superfluous tlb invalidation and memory barriers. This series reworks
> the kernel pgtable generation code to significantly reduce the number of those
> TLBIs, ISBs and DSBs. See each patch for details.
> 
> The below shows the execution time of map_mem() across a couple of different
> systems with different RAM configurations. We measure after applying each patch
> and show the improvement relative to base (v6.9-rc2):
> 
> [...]

Applied to arm64 (for-next/mm), thanks!

[1/3] arm64: mm: Don't remap pgtables per-cont(pte|pmd) block
      https://git.kernel.org/arm64/c/5c63db59c5f8
[2/3] arm64: mm: Batch dsb and isb when populating pgtables
      https://git.kernel.org/arm64/c/1fcb7cea8a5f
[3/3] arm64: mm: Don't remap pgtables for allocate vs populate
      https://git.kernel.org/arm64/c/0e9df1c905d8

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev