On Fri, Oct 21, 2022 at 04:36:20PM +0000, James Houghton wrote: > Currently this check is overly aggressive. For some userfaultfd VMAs, > VMA sharing is disabled, yet we still widen the address range, which is > used for flushing TLBs and sending MMU notifiers. > > This is done now, as HGM VMAs also have sharing disabled, yet would > still have flush ranges adjusted. Overaggressively flushing TLBs and > triggering MMU notifiers is particularly harmful with lots of > high-granularity operations. > > Signed-off-by: James Houghton <jthoughton@xxxxxxxxxx> Acked-by: Peter Xu <peterx@xxxxxxxxxx> -- Peter Xu
