From: Catalin Marinas <catalin.marinas@arm.com>
To: Linus Walleij <linusw@kernel.org>
Cc: Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Oliver Upton <oupton@kernel.org>, Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev
Subject: Re: [PATCH] arm64: clear_page[s] using memset
Date: Tue, 7 Apr 2026 14:47:45 +0100 [thread overview]
Message-ID: <adULAT2xus5z3HdQ@arm.com> (raw)
In-Reply-To: <CAD++jL=G81=ueo7djqUETToE459kpFGniWvBwnYbJtmXrm8MFw@mail.gmail.com>
On Tue, Apr 07, 2026 at 11:25:55AM +0200, Linus Walleij wrote:
> Quoting my own commit message hehe:
>
> > No performance regressions can be seen, the fastpath
> > benchmarks differences are in the noise.
>
> This was tested on hardware with Ryan Robert's fastpath tool.
BTW, have you tried the perf bench mmap test again with the new
clear_page? Both with single page and multiple pages scenarios. And
ideally on more than one platform.
Will pointed out (in a private chat) that current clear_page() uses
non-temporal stores while memset() doesn't. It may not make any
difference in practice but it would be good to have some numbers.
--
Catalin
prev parent reply other threads:[~2026-04-07 13:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-06 8:57 [PATCH] arm64: clear_page[s] using memset Linus Walleij
2026-04-02 20:57 ` Catalin Marinas
2026-04-07 9:25 ` Linus Walleij
2026-04-07 9:42 ` Catalin Marinas
2026-04-07 13:47 ` Catalin Marinas [this message]
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