linux-kernel - Re: [tip: x86/mm] x86/uaccess: Improve performance by aligning writes to 8 bytes in copy_user

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Message-ID: <Z-cZAmfQqXi3bw2c@gmail.com>
Date: Fri, 28 Mar 2025 22:47:46 +0100
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: linux-tip-commits@...r.kernel.org,
	Ondrej Lichtner <olichtne@...hat.com>,
	"Herton R. Krzesinski" <herton@...hat.com>, x86@...nel.org
Subject: Re: [tip: x86/mm] x86/uaccess: Improve performance by aligning
 writes to 8 bytes in copy_user_generic(), on non-FSRM/ERMS CPUs


* tip-bot2 for Herton R. Krzesinski <tip-bot2@...utronix.de> wrote:

> The following commit has been merged into the x86/mm branch of tip:
> 
> Commit-ID:     411d2763b3ba0e3a99cd27ce813738d530b2320d
> Gitweb:        https://git.kernel.org/tip/411d2763b3ba0e3a99cd27ce813738d530b2320d
> Author:        Herton R. Krzesinski <herton@...hat.com>
> AuthorDate:    Thu, 20 Mar 2025 11:22:13 -03:00
> Committer:     Ingo Molnar <mingo@...nel.org>
> CommitterDate: Fri, 28 Mar 2025 21:56:49 +01:00
> 
> x86/uaccess: Improve performance by aligning writes to 8 bytes in copy_user_generic(), on non-FSRM/ERMS CPUs
> 
> History of the performance regression:
> ======================================
> 
> Since the a series of user copy updates were merged upstream
        ^^^^^
> ~2 years ago via:

That was my mistake in a last-minute edit to the changelog.
I force-pushed a fix:

  |  Since the following series of user copy updates were merged upstream
  |  ~2 years ago via:

Thanks,

	Ingo