linux-kernel - Re: (subset) [PATCH v2] KVM: arm64: Move data barrier to end of split walk

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Message-Id: <172433664072.3702537.8419277728828269501.b4-ty@kernel.org>
Date: Thu, 22 Aug 2024 15:25:08 +0100
From: Marc Zyngier <maz@...nel.org>
To: kvm@...r.kernel.org,
	Colton Lewis <coltonlewis@...gle.com>
Cc: Oliver Upton <oliver.upton@...ux.dev>,
	Ricardo Koller <ricarkol@...gle.com>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: (subset) [PATCH v2] KVM: arm64: Move data barrier to end of split walk

On Thu, 08 Aug 2024 17:42:43 +0000, Colton Lewis wrote:
> This DSB guarantees page table updates have been made visible to the
> hardware table walker. Moving the DSB from stage2_split_walker() to
> after the walk is finished in kvm_pgtable_stage2_split() results in a
> roughly 70% reduction in Clear Dirty Log Time in
> dirty_log_perf_test (modified to use eager page splitting) when using
> huge pages. This gain holds steady through a range of vcpus
> used (tested 1-64) and memory used (tested 1-64GB).
> 
> [...]

Applied to next, thanks!

[1/1] KVM: arm64: Move data barrier to end of split walk
      commit: 38753cbc4dca431d4354319c7481f6bd1a212baf

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.