Re: [PATCH net-next 1/2] tcp: add TCP_ZEROCOPY_RECEIVE support for zerocopy receive
From: Christoph Hellwig
Date: Wed Apr 25 2018 - 11:24:29 EST
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..