From: "Toke Høiland-Jørgensen" <toke@redhat•com>
To: Byungchul Park <byungchul@sk•com>,
linux-mm@kvack•org, netdev@vger•kernel.org
Cc: linux-kernel@vger•kernel.org, kernel_team@skhynix•com,
harry.yoo@oracle•com, ast@kernel•org, daniel@iogearbox•net,
davem@davemloft•net, kuba@kernel•org, hawk@kernel•org,
john.fastabend@gmail•com, sdf@fomichev•me, saeedm@nvidia•com,
leon@kernel•org, tariqt@nvidia•com, mbloch@nvidia•com,
andrew+netdev@lunn•ch, edumazet@google•com, pabeni@redhat•com,
akpm@linux-foundation•org, david@redhat•com,
lorenzo.stoakes@oracle•com, Liam.Howlett@oracle•com,
vbabka@suse•cz, rppt@kernel•org, surenb@google•com,
mhocko@suse•com, horms@kernel•org, jackmanb@google•com,
hannes@cmpxchg•org, ziy@nvidia•com, ilias.apalodimas@linaro•org,
willy@infradead•org, brauner@kernel•org, kas@kernel•org,
yuzhao@google•com, usamaarif642@gmail•com,
baolin.wang@linux•alibaba.com, almasrymina@google•com,
asml.silence@gmail•com, bpf@vger•kernel.org,
linux-rdma@vger•kernel.org, sfr@canb•auug.org.au, dw@davidwei•uk,
ap420073@gmail•com, dtatulea@nvidia•com
Subject: Re: [RFC mm v5 1/2] page_pool: check nmdesc->pp to see its usage as page pool for net_iov not page-backed
Date: Mon, 03 Nov 2025 13:24:39 +0100 [thread overview]
Message-ID: <87ms53pam0.fsf@toke.dk> (raw)
In-Reply-To: <20251103075108.26437-2-byungchul@sk.com>
Byungchul Park <byungchul@sk•com> writes:
> Currently, the condition 'page->pp_magic == PP_SIGNATURE' is used to
> determine if a page belongs to a page pool. However, with the planned
> removal of ->pp_magic, we will instead leverage the page_type in struct
> page, such as PGTY_netpp, for this purpose.
>
> That works for page-backed network memory. However, for net_iov not
> page-backed, the identification cannot be based on the page_type.
> Instead, nmdesc->pp can be used to see if it belongs to a page pool, by
> making sure nmdesc->pp is NULL otherwise.
>
> For net_iov not page-backed, initialize it using nmdesc->pp = NULL in
> net_devmem_bind_dmabuf() and using kvmalloc_array(__GFP_ZERO) in
> io_zcrx_create_area() so that netmem_is_pp() can check if nmdesc->pp is
> !NULL to confirm its usage as page pool.
>
> Signed-off-by: Byungchul Park <byungchul@sk•com>
> Reviewed-by: Mina Almasry <almasrymina@google•com>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat•com>
next prev parent reply other threads:[~2025-11-03 12:24 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-03 7:51 [RFC mm v5 0/2] mm, page_pool: introduce a new page type for page pool in page type Byungchul Park
2025-11-03 7:51 ` [RFC mm v5 1/2] page_pool: check nmdesc->pp to see its usage as page pool for net_iov not page-backed Byungchul Park
2025-11-03 12:24 ` Toke Høiland-Jørgensen [this message]
2025-11-06 11:07 ` Pavel Begunkov
2025-11-07 1:33 ` Jakub Kicinski
2025-11-07 1:59 ` Byungchul Park
2025-11-07 2:08 ` Jakub Kicinski
2025-11-07 4:47 ` Byungchul Park
2025-11-08 1:41 ` Jakub Kicinski
2025-11-08 2:24 ` Byungchul Park
2025-11-08 2:29 ` Byungchul Park
2025-11-08 2:37 ` Jakub Kicinski
2025-11-10 1:09 ` Byungchul Park
2025-11-11 1:40 ` Byungchul Park
2025-11-11 1:56 ` Jakub Kicinski
2025-11-11 2:17 ` Byungchul Park
2025-11-11 2:45 ` Byungchul Park
2025-11-11 12:36 ` Toke Høiland-Jørgensen
2025-11-12 7:41 ` Byungchul Park
2025-11-15 1:23 ` Jakub Kicinski
2025-11-17 4:25 ` Byungchul Park
2025-11-03 7:51 ` [RFC mm v5 2/2] mm: introduce a new page type for page pool in page type Byungchul Park
2025-11-03 12:26 ` Toke Høiland-Jørgensen
2025-11-03 12:39 ` Byungchul Park
2025-11-03 14:50 ` Toke Høiland-Jørgensen
2025-11-06 11:08 ` Pavel Begunkov
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