From: Matteo Croce <mcroce@linux.microsoft.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: netdev@vger.kernel.org, linux-mm@kvack.org,
Ayush Sawal <ayush.sawal@chelsio.com>,
Vinay Kumar Yadav <vinay.yadav@chelsio.com>,
Rohit Maheshwari <rohitm@chelsio.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Marcin Wojtas <mw@semihalf.com>,
Russell King <linux@armlinux.org.uk>,
Mirko Lindner <mlindner@marvell.com>,
Stephen Hemminger <stephen@networkplumber.org>,
Tariq Toukan <tariqt@nvidia.com>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
Boris Pismenny <borisp@nvidia.com>, Arnd Bergmann <arnd@arndb.de>,
Andrew Morton <akpm@linux-foundation.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Vlastimil Babka <vbabka@suse.cz>, Yu Zhao <yuzhao@google.com>,
Will Deacon <will@kernel.org>, Fenghua Yu <fenghua.yu@intel.com>,
Roman Gushchin <guro@fb.com>, Hugh Dickins <hughd@google.com>,
Peter Xu <peterx@redhat.com>, Jason Gunthorpe <jgg@ziepe.ca>,
Jonathan Lemon <jonathan.lemon@gmail.com>,
Alexander Lobakin <alobakin@pm.me>,
Cong Wang <cong.wang@bytedance.com>, wenxu <wenxu@ucloud.cn>,
Kevin Hao <haokexin@gmail.com>,
Jakub Sitnicki <jakub@cloudflare.com>,
Marco Elver <elver@google.com>,
Willem de Bruijn <willemb@google.com>,
Miaohe Lin <linmiaohe@huawei.com>,
Yunsheng Lin <linyunsheng@huawei.com>,
Guillaume Nault <gnault@redhat.com>,
linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
bpf@vger.kernel.org, Eric Dumazet <edumazet@google.com>,
David Ahern <dsahern@gmail.com>,
Lorenzo Bianconi <lorenzo@kernel.org>,
Saeed Mahameed <saeedm@nvidia.com>, Andrew Lunn <andrew@lunn.ch>,
Paolo Abeni <pabeni@redhat.com>,
Sven Auhagen <sven.auhagen@voleatech.de>
Subject: Re: [PATCH net-next v7 1/5] mm: add a signature in struct page
Date: Mon, 7 Jun 2021 15:58:23 +0200 [thread overview]
Message-ID: <CAFnufp1fF5NtM_NzhVG6MmRwkvDot+usPdAOhHdfQUVCHhV75w@mail.gmail.com> (raw)
In-Reply-To: <YL4kpntfzMBXGSfV@casper.infradead.org>
On Mon, Jun 7, 2021 at 3:53 PM Matthew Wilcox <willy@infradead.org> wrote:
>
> On Sun, Jun 06, 2021 at 03:50:54AM +0200, Matteo Croce wrote:
> > And change all the *_pfmemalloc functions to use page->lru.next like this?
> >
> > @@ -1668,10 +1668,12 @@ struct address_space *page_mapping(struct page *page);
> > static inline bool page_is_pfmemalloc(const struct page *page)
> > {
> > /*
> > - * Page index cannot be this large so this must be
> > - * a pfmemalloc page.
> > + * This is not a tail page; compound_head of a head page is unused
> > + * at return from the page allocator, and will be overwritten
> > + * by callers who do not care whether the page came from the
> > + * reserves.
> > */
>
> The comment doesn't make a lot of sense if we're switching to use
> lru.next. How about:
>
> /*
> * lru.next has bit 1 set if the page is allocated from the
> * pfmemalloc reserves. Callers may simply overwrite it if
> * they do not need to preserve that information.
> */
Sounds good!
--
per aspera ad upstream
next prev parent reply other threads:[~2021-06-07 13:59 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-04 18:33 [PATCH net-next v7 0/5] page_pool: recycle buffers Matteo Croce
2021-06-04 18:33 ` [PATCH net-next v7 1/5] mm: add a signature in struct page Matteo Croce
2021-06-04 19:07 ` Matthew Wilcox
2021-06-04 22:59 ` Matteo Croce
2021-06-05 14:32 ` Matthew Wilcox
2021-06-06 1:50 ` Matteo Croce
2021-06-07 13:52 ` Matthew Wilcox
2021-06-07 13:58 ` Matteo Croce [this message]
2021-06-04 18:33 ` [PATCH net-next v7 2/5] skbuff: add a parameter to __skb_frag_unref Matteo Croce
2021-06-04 18:33 ` [PATCH net-next v7 3/5] page_pool: Allow drivers to hint on SKB recycling Matteo Croce
2021-06-04 19:41 ` Matthew Wilcox
2021-06-07 4:51 ` Ilias Apalodimas
2021-06-07 14:55 ` Matteo Croce
2021-06-04 18:33 ` [PATCH net-next v7 4/5] mvpp2: recycle buffers Matteo Croce
2021-06-04 19:48 ` Matthew Wilcox
2021-06-06 1:59 ` Matteo Croce
2021-06-04 18:33 ` [PATCH net-next v7 5/5] mvneta: " Matteo Croce
2021-06-04 18:57 ` [PATCH net-next v7 0/5] page_pool: " Matthew Wilcox
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