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Re: [PATCH 0/5] x86: Cleanups around slow_down_io()
- To: Ingo Molnar <mingo@xxxxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Tue, 16 Dec 2025 14:55:54 +0100
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- Cc: linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-hwmon@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>, Alexey Makhalov <alexey.makhalov@xxxxxxxxxxxx>, Broadcom internal kernel review list <bcm-kernel-feedback-list@xxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Jean Delvare <jdelvare@xxxxxxxx>, Guenter Roeck <linux@xxxxxxxxxxxx>, Denis Efremov <efremov@xxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>
- Delivery-date: Tue, 16 Dec 2025 13:56:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.12.25 14:48, Ingo Molnar wrote:
* Jürgen Groß <jgross@xxxxxxxx> wrote:
CPUs anymore. Should it cause any regressions, it's easy to bisect to.
There's been enough changes around all these facilities that the
original timings are probably way off already, so we've just been
cargo-cult porting these to newer kernels essentially.
Fine with me.
Which path to removal of io_delay would you (and others) prefer?
1. Ripping it out immediately.
I'd just rip it out immediately, and see who complains. :-)
I figured this might be a little bit too evil. :-)
I've just sent V2 defaulting to have no delay, so anyone hit by that
can still fix it by applying the "io_delay" boot parameter.
I'll do the ripping out for kernel 6.21 (or whatever it will be called).
Juergen
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