On Fri, Oct 08, 2021 at 04:22:27PM +0100, Valentin Schneider wrote: > So x86 has it default yes, and a lot of others (e.g. arm64) have it default > no. > > IMO you don't gain much by disabling them. SCHED_MC and SCHED_CLUSTER only > control the presence of a sched_domain_topology_level - if it's useless it > gets degenerated at domain build time. Some valid reasons for not using > them is if the architecture defines its own topology table (e.g. powerpc > has CACHE and MC levels which are not gated behind any CONFIG). > > SCHED_SMT has an impact on code generated in sched/core.c, but that is also > gated by a static key. > > So I'd say having them default yes is sensible. I'd even say we should > change the "If unsure say N here." to "Y". Right, so I tend to agree (and also that we should fix that Kconfig help text). But it would be very nice to have feedback from the affected arch maintainers.
