Re: [PATCHSET RFC] sched: Implement BPF extensible scheduler class

[Peter Zijlstra]

On Tue, Nov 29, 2022 at 10:22:42PM -1000, Tejun Heo wrote:

> Rolling out kernel upgrades is a slow and iterative process. At a large scale
> it can take months to roll a new kernel out to a fleet of servers. While this
> latency is expected and inevitable for normal kernel upgrades, it can become
> highly problematic when kernel changes are required to fix bugs. Livepatch [9]
> is available to quickly roll out critical security fixes to large fleets, but
> the scope of changes that can be applied with livepatching is fairly limited,
> and would likely not be usable for patching scheduling policies. With
> sched_ext, new scheduling policies can be rapidly rolled out to production
> environments.

I don't think we can or should use this argument to push BPF into ever
more places.