Messages in this thread | | | Date | Wed, 25 Apr 2018 08:24:22 -0700 | From | Christoph Hellwig <> | Subject | Re: [PATCH net-next 1/2] tcp: add TCP_ZEROCOPY_RECEIVE support for zerocopy receive |
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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..
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