linux-kernel - Re: [GIT pull] x86/urgent for v5.9-rc2

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Message-ID: <CAHk-=wiQQRS1f0qMwVVWKd6YHJ9K3bUK4BR2zoeGeCWRpTM3aw@mail.gmail.com>
Date:   Sun, 23 Aug 2020 11:29:19 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [GIT pull] x86/urgent for v5.9-rc2

On Sun, Aug 23, 2020 at 1:26 AM Thomas Gleixner <tglx@...utronix.de> 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.

                   Linus