From: Will Deacon <will@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ard Biesheuvel <ardb@kernel.org>,
David Hildenbrand <david@redhat.com>,
Donald Dutile <ddutile@redhat.com>,
Eric Chanudet <echanude@redhat.com>,
Ryan Roberts <ryan.roberts@arm.com>
Cc: kernel-team@android.com, Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 0/3] Speed up boot with faster linear map creation
Date: Fri, 12 Apr 2024 17:06:41 +0100 [thread overview]
Message-ID: <171293670589.3659902.6442840474459477952.b4-ty@kernel.org> (raw)
In-Reply-To: <20240412131908.433043-1-ryan.roberts@arm.com>
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
next prev parent reply other threads:[~2024-04-12 16:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-12 13:19 Ryan Roberts
2024-04-12 13:19 ` [PATCH v3 1/3] arm64: mm: Don't remap pgtables per-cont(pte|pmd) block Ryan Roberts
2024-04-11 14:03 ` Itaru Kitayama
2024-04-12 13:19 ` [PATCH v3 2/3] arm64: mm: Batch dsb and isb when populating pgtables Ryan Roberts
2024-04-12 13:19 ` [PATCH v3 3/3] arm64: mm: Don't remap pgtables for allocate vs populate Ryan Roberts
2024-04-12 14:56 ` [PATCH v3 0/3] Speed up boot with faster linear map creation Mark Rutland
2024-04-12 15:00 ` Ard Biesheuvel
2024-04-12 16:06 ` Will Deacon [this message]
2024-04-10 12:53 ` Itaru Kitayama
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