Re: [tip: sched/core] sched/debug: Remove CONFIG_SCHED_DEBUG

[Peter Zijlstra]

On Thu, Mar 20, 2025 at 08:59:56AM -0000, tip-bot2 for Ingo Molnar wrote:
> The following commit has been merged into the sched/core branch of tip:
> 
> Commit-ID:     b52173065e0aad82a31863bb5f63ebe46f7eb657
> Gitweb:        https://git.kernel.org/tip/b52173065e0aad82a31863bb5f63ebe46f7eb657
> Author:        Ingo Molnar <mingo@xxxxxxxxxx>
> AuthorDate:    Mon, 17 Mar 2025 11:42:56 +01:00
> Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
> CommitterDate: Wed, 19 Mar 2025 22:23:24 +01:00
> 
> sched/debug: Remove CONFIG_SCHED_DEBUG
> 
> For more than a decade, CONFIG_SCHED_DEBUG=y has been enabled
> in all the major Linux distributions:
> 
>    /boot/config-6.11.0-19-generic:CONFIG_SCHED_DEBUG=y
> 
> The reason is that while originally CONFIG_SCHED_DEBUG started
> out as a debugging feature, over the years (decades ...) it has
> grown various bits of statistics, instrumentation and
> control knobs that are useful for sysadmin and general software
> development purposes as well.
> 
> But within the kernel we still pretend that there's a choice,
> and sometimes code that is seemingly 'debug only' creates overhead
> that should be optimized in reality.
> 
> So make it all official and make CONFIG_SCHED_DEBUG unconditional.
> 
> Now that all uses of CONFIG_SCHED_DEBUG are removed from
> the code by previous patches, remove the Kconfig option as well.


I really don't much like this :-(