> On May 15, 2023, at 9:43 AM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > > So while ARM32, CSKY, NIOS, PPC (some variants), _should_ arguably have > a fallback to tlb_flush_all() when the range is too large, there is > another issue. I've seen a couple of instances where _vm_unmap_aliases() > collects one page and the actual va list has only 2 pages, which might > be eventually worth to flush one by one. > > I'm not sure whether that's worth it as checking for those gaps might be > too expensive for the case where a large number of va entries needs to > be flushed. I know you were cc’d, but for the record, here's a related discussion: https://lore.kernel.org/all/CA+55aFwVUkdaf0_rBk7uJHQjWXu+OcLTHc6FKuCn0Cb2Kvg9NA@xxxxxxxxxxxxxx/
