On 4/28/23 10:29, David Hildenbrand wrote: ... >> Is that an issue with interrupts disabled though? Will block page tables being >> removed and as Kirill says (sorry I maybe misinterpreted you) we should be ok. > > Let's rule out page table freeing. If our VMA only spans a single page > and falls into the same PMD as another VMA, an munmap() would not even > free a single page table. > > However, if unmapping a page (flushing the TLB) would imply an IPI as > Kirill said, we'd be fine. I recall that that's not the case for all > architectures, but I might be just wrong. > Some architectures use IPIs, and others use an RCU-like approach instead. thanks, -- John Hubbard NVIDIA
