On 10/21/22 16:36, 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. Yes, the userfaultfd check is missing in the code today. > 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> > --- > mm/hugetlb.c | 21 +++++++++++++++------ > 1 file changed, 15 insertions(+), 6 deletions(-) Thanks, Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> -- Mike Kravetz
