Re: [RFC] Perfomance varies according to sysctl_sched_migration_cost

[Peter Zijlstra]

On Tue, Sep 14, 2021 at 03:27:09PM +0800, Yicong Yang wrote:
> 2. The ABI now has been removed from sysctl and moved to debugfs. As tuning this can improve the performance
>    of some workloads on some platforms, maybe it's better to make it a formal sysctl again with docs?

It never was an ABI, there is nothing to restore. It has always been
CONFIG_SCHED_DEBUG.

I'm open to topology based improvements to the code, but I don't think
user tunables are a good way.