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Date:   Sun, 23 Aug 2020 11:29:19 -0700
From:   Linus Torvalds <>
To:     Thomas Gleixner <>
Cc:     Linux Kernel Mailing List <>,
        "the arch/x86 maintainers" <>
Subject: Re: [GIT pull] x86/urgent for v5.9-rc2

On Sun, Aug 23, 2020 at 1:26 AM Thomas Gleixner <> wrote:
> Remove the RDPID optimization, which is not even
> backed by numbers from the paranoid entry path instead.

Ugh, that's sad. I'd expect the LSL to be quite a bit slower than the
RDPID on raw hardware, since LSL has to go out to the GDT.

And I don't think we need the GDT for anything else normally, so it's
not even going to be cached.

Oh well.


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