On Sun, 2022-01-09 at 00:49 -0800, Nadav Amit wrote: > > It is possible for instance to get rid of is_lazy, keep the CPU > on mm_cpumask when switching to kernel thread, and then if/when > an IPI is received remove it from cpumask to avoid further > unnecessary TLB shootdown IPIs. > > I do not know whether it is a pure win, but there is a tradeoff. That's not a win at all. It is what we used to have before the lazy mm stuff was re-introduced, and it led to quite a few unnecessary IPIs, which are especially slow on virtual machines, where the target CPU may not be running. -- All Rights Reversed.
Attachment:
signature.asc
Description: This is a digitally signed message part
