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Message-ID: <ZhaL1TABj0Qf7UKR@vm3>
Date: Wed, 10 Apr 2024 21:53:41 +0900
From: Itaru Kitayama <itaru.kitayama@...ux.dev>
To: Will Deacon <will@...nel.org>
Cc: 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>, kernel-team@...roid.com,
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, Apr 12, 2024 at 05:06:41PM +0100, Will Deacon wrote:
> 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
I confirm this series boots the system on FVP (with my .config and my
buildroot rootfs using Shrinkwrap).
Tested-by: Itaru Kitayama <itaru.kitayama@...itsu.com>
Thanks,
Itaru.
>
> Cheers,
> --
> Will
>
> https://fixes.arm64.dev
> https://next.arm64.dev
> https://will.arm64.dev
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