linux-kernel - Re: [PATCH v2 0/4] Initial BBML2 support for contpte

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Message-ID: <8609f693-0786-40bd-9136-3a8f9ee9304b@redhat.com>
Date: Mon, 3 Mar 2025 10:14:21 +0100
From: David Hildenbrand <david@...hat.com>
To: Mikołaj Lenczewski <miko.lenczewski@....com>,
 ryan.roberts@....com, suzuki.poulose@....com, yang@...amperecomputing.com,
 catalin.marinas@....com, will@...nel.org, joro@...tes.org,
 jean-philippe@...aro.org, mark.rutland@....com, joey.gouly@....com,
 oliver.upton@...ux.dev, james.morse@....com, broonie@...nel.org,
 maz@...nel.org, akpm@...ux-foundation.org, jgg@...pe.ca,
 nicolinc@...dia.com, mshavit@...gle.com, jsnitsel@...hat.com,
 smostafa@...gle.com, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, iommu@...ts.linux.dev
Subject: Re: [PATCH v2 0/4] Initial BBML2 support for contpte_convert()

On 28.02.25 19:24, Mikołaj Lenczewski wrote:
> Hi All,
> 
> This patch series adds adding initial support for eliding
> break-before-make requirements on systems that support BBML2 and
> additionally guarantee to never raise a conflict abort.
> 
> This support reorders and optionally elides a TLB invalidation in
> contpte_convert(). The elision of said invalidation leads to a 12%
> improvement when executing a microbenchmark designed to force the
> pathological path where contpte_convert() gets called. This
> represents an 80% reduction in the cost of calling contpte_convert().

Just a general comment: Nice! :)

-- 
Cheers,

David / dhildenb