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From: Christoph Hellwig <hch@infradead.org>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Eric Dumazet <edumazet@google.com>,
"David S . Miller" <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>,
Andy Lutomirski <luto@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Soheil Hassas Yeganeh <soheil@google.com>
Subject: Re: [PATCH net-next 1/2] tcp: add TCP_ZEROCOPY_RECEIVE support for zerocopy receive
Date: Wed, 25 Apr 2018 08:24:22 -0700 [thread overview]
Message-ID: <20180425152422.GB27076@infradead.org> (raw)
In-Reply-To: <5cd31eba-63b5-9160-0a2e-f441340df0d3@gmail.com>
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..
next prev parent reply other threads:[~2018-04-25 15:24 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-25 5:27 [PATCH net-next 0/2] tcp: mmap: rework " Eric Dumazet
2018-04-25 5:27 ` [PATCH net-next 1/2] tcp: add TCP_ZEROCOPY_RECEIVE support for " Eric Dumazet
2018-04-25 6:28 ` Christoph Hellwig
2018-04-25 13:01 ` Eric Dumazet
2018-04-25 15:24 ` Christoph Hellwig [this message]
2018-04-25 16:04 ` Matthew Wilcox
2018-04-25 16:20 ` Eric Dumazet
2018-04-25 16:30 ` Matthew Wilcox
2018-04-25 16:22 ` Andy Lutomirski
2018-04-25 16:35 ` Eric Dumazet
2018-04-25 16:44 ` Eric Dumazet
2018-04-25 13:42 ` Eric Dumazet
2018-04-25 5:27 ` [PATCH net-next 2/2] selftests: net: tcp_mmap must use TCP_ZEROCOPY_RECEIVE Eric Dumazet
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