Re: [PATCH RESEND] x86/split_lock: Make split lock mitigation sleep duration configurable

[Borislav Petkov]

On Tue, Oct 28, 2025 at 05:43:33PM +0800, Fushuai Wang wrote:
> Commit 727209376f49 ("x86/split_lock: Add sysctl to control the misery
> mode") introduce a sysctl 'sysctl_sld_mitigate' to control the misery
> mode for split lock detection (0 to disable, 1 to enable). However,
> when enabled, the sleep duration for split lockers was fixed at 10 ms.
> 
> This patch extands 'sysctl_sld_mitigate' to allow configuring the sleep
> duration in milliseconds. Now, when 'sysctl_sld_mitigate' is set to
> N (N > 0), split lockers will sleep for N milliseconds.

I'm reading this and the only question that pops up in my mind is "why".

Why does the upstream kernel need this?

-- 
Regards/Gruss,
    Boris.

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