Re: [PATCH v4 3/4] lazy tlb: shoot lazies, a non-refcounting lazy tlb option

Excerpts from Nicholas Piggin's message of June 5, 2021 11:42 am: > On big systems, the mm refcount can become highly contented when doing > a lot of context switching with threaded applications (particularly > switching between the idle thread and an application thread). > > Abandoning lazy tlb s

[PATCH v4 3/4] lazy tlb: shoot lazies, a non-refcounting lazy tlb option

On big systems, the mm refcount can become highly contented when doing a lot of context switching with threaded applications (particularly switching between the idle thread and an application thread). Abandoning lazy tlb slows switching down quite a bit in the important user->idle->user cases, so