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SubjectRe: [PATCH net-next 1/2] tcp: add TCP_ZEROCOPY_RECEIVE support for zerocopy receive
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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