On 8/22/22 13:51, Yicong Yang wrote: > +static inline bool arch_tlbbatch_should_defer(struct mm_struct *mm) > +{ > + return true; > +} This needs to be conditional on systems, where there will be performance improvements, and should not just be enabled all the time on all systems. num_online_cpus() > X, which does not hold any cpu hotplug lock would be a good metric ?