Re: [PATCH net-next v3 2/5] mm: add a signature in struct page

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To: Shakeel Butt <shakeelb@xxxxxxxxxx>
Subject: Re: [PATCH net-next v3 2/5] mm: add a signature in struct page
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Wed, 14 Apr 2021 22:51:59 +0200
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>, Ilias Apalodimas <ilias.apalodimas@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Matteo Croce <mcroce@xxxxxxxxxxxxxxxxxxx>, netdev <netdev@xxxxxxxxxxxxxxx>, Linux MM <linux-mm@xxxxxxxxx>, Ayush Sawal <ayush.sawal@xxxxxxxxxxx>, Vinay Kumar Yadav <vinay.yadav@xxxxxxxxxxx>, Rohit Maheshwari <rohitm@xxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxx>, Marcin Wojtas <mw@xxxxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, Mirko Lindner <mlindner@xxxxxxxxxxx>, Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>, Tariq Toukan <tariqt@xxxxxxxxxx>, Jesper Dangaard Brouer <hawk@xxxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, John Fastabend <john.fastabend@xxxxxxxxx>, Boris Pismenny <borisp@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Yu Zhao <yuzhao@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Michel Lespinasse <walken@xxxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Roman Gushchin <guro@xxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Guoqing Jiang <guoqing.jiang@xxxxxxxxxxxxxxx>, Jonathan Lemon <jonathan.lemon@xxxxxxxxx>, Alexander Lobakin <alobakin@xxxxx>, Cong Wang <cong.wang@xxxxxxxxxxxxx>, wenxu <wenxu@xxxxxxxxx>, Kevin Hao <haokexin@xxxxxxxxx>, Aleksandr Nogikh <nogikh@xxxxxxxxxx>, Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>, Marco Elver <elver@xxxxxxxxxx>, Willem de Bruijn <willemb@xxxxxxxxxx>, Miaohe Lin <linmiaohe@xxxxxxxxxx>, Yunsheng Lin <linyunsheng@xxxxxxxxxx>, Guillaume Nault <gnault@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-rdma <linux-rdma@xxxxxxxxxxxxxxx>, bpf <bpf@xxxxxxxxxxxxxxx>, David Ahern <dsahern@xxxxxxxxx>, Lorenzo Bianconi <lorenzo@xxxxxxxxxx>, Saeed Mahameed <saeedm@xxxxxxxxxx>, Andrew Lunn <andrew@xxxxxxx>, Paolo Abeni <pabeni@xxxxxxxxxx>
In-reply-to: <CALvZod4F8kCQQcK5_3YH=7keqkgY-97g+_OLoDCN7uNJdd61xA@mail.gmail.com>
References: <20210409223801.104657-1-mcroce@linux.microsoft.com> <20210409223801.104657-3-mcroce@linux.microsoft.com> <20210410154824.GZ2531743@casper.infradead.org> <YHHPbQm2pn2ysth0@enceladus> <CALvZod7UUxTavexGCzbKaK41LAW7mkfQrnDhFbjo-KvH9P6KsQ@mail.gmail.com> <YHHuE7g73mZNrMV4@enceladus> <20210414214132.74f721dd@carbon> <CALvZod4F8kCQQcK5_3YH=7keqkgY-97g+_OLoDCN7uNJdd61xA@mail.gmail.com>

On Wed, Apr 14, 2021 at 10:09 PM Shakeel Butt <shakeelb@xxxxxxxxxx> wrote:

>
> I will let TCP RX zerocopy experts respond to this but from my high
> level code inspection, I didn't see page->private usage.

Indeed, we do not use page->private, since we do not own the page(s).

References:
- [PATCH net-next v3 0/5] page_pool: recycle buffers
  - From: Matteo Croce
- Re: [PATCH net-next v3 2/5] mm: add a signature in struct page
  - From: Matthew Wilcox
- Re: [PATCH net-next v3 2/5] mm: add a signature in struct page
  - From: Ilias Apalodimas
- Re: [PATCH net-next v3 2/5] mm: add a signature in struct page
  - From: Shakeel Butt
- Re: [PATCH net-next v3 2/5] mm: add a signature in struct page
  - From: Ilias Apalodimas
- Re: [PATCH net-next v3 2/5] mm: add a signature in struct page
  - From: Jesper Dangaard Brouer
- Re: [PATCH net-next v3 2/5] mm: add a signature in struct page
  - From: Shakeel Butt

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