On Tue, Jun 20, 2023 at 05:46:16PM +0300, Yair Podemsky wrote: > Currently the tlb_remove_table_smp_sync IPI is sent to all CPUs > indiscriminately, this causes unnecessary work and delays notable in > real-time use-cases and isolated cpus. > By limiting the IPI to only be sent to cpus referencing the effected > mm. > a config to differentiate architectures that support mm_cpumask from > those that don't will allow safe usage of this feature. > > changes from -v1: > - Previous version included a patch to only send the IPI to CPU's with > context_tracking in the kernel space, this was removed due to race > condition concerns. > - for archs that do not maintain mm_cpumask the mask used should be > cpu_online_mask (Peter Zijlstra). > Would it not be much better to fix the root cause? As per the last time, there's patches that cure the thp abuse of this.
