On Thu, Jun 22, 2023 at 09:47:22AM -0300, Marcelo Tosatti wrote: > > there's patches that cure the thp abuse of this. > > The other case where the IPI can happen is: > > CPU-0 CPU-1 > > tlb_remove_table > tlb_remove_table_sync_one > IPI > local_irq_disable > gup_fast > local_irq_enable > > > So its not only the THP case.
(your CPU-1 thing is wholly irrelevant) Well, I know, but this case *should* be exceedingly rare. Last time around I asked why you all were tripping this, you pointed at the THP case. The THP case should be fixed along the lines of Jann's original patches. If you can trip this at any significant rate, then we should probably look at a better allocation scheme. It means you're really low on memory.
