On Wed, Apr 25, 2018 at 06:01:02AM -0700, Eric Dumazet wrote: > Thanks Christoph > > Note the high cost of zap_page_range(), needed to avoid -EBUSY being returned > from vm_insert_page() the second time TCP_ZEROCOPY_RECEIVE is used on one VMA. > > Ideally a vm_replace_page() would avoid this cost ? No my area of expertise, I'll defer to the MM folks..
