From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Byungchul Park <byungchul@sk.com>
Cc: Dragos Tatulea <dtatulea@nvidia.com>,
linux-mm@kvack.org, akpm@linux-foundation.org,
netdev@vger.kernel.org, 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, 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, toke@redhat.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
Subject: Re: [PATCH v4] mm: introduce a new page type for page pool in page type
Date: Mon, 18 May 2026 11:33:59 +0200 [thread overview]
Message-ID: <65d11b12-5696-4403-8062-3ae65ca9113e@kernel.org> (raw)
In-Reply-To: <20260513132636.GA75142@system.software.com>
On 5/13/26 15:26, Byungchul Park wrote:
> On Wed, May 13, 2026 at 03:02:43PM +0200, David Hildenbrand (Arm) wrote:
>> On 5/13/26 14:39, Byungchul Park wrote:
>>> On 5/13/26 14:18, Byungchul Park wrote:
>>>
>>> This is not final patch, but for sharing the rough idea *with code* -
>>> maybe there are more points in code that should be adjusted by the
>>> change. I just typed the draft patch quick just for sharing idea.
>>>
>>> If we should allow pp type pages to be used in mapping as well, then
>>> we should allow a page to keep both its type and mapcount at the same
>>> time. Am I missing something?
>>
>> We don't want code to accidentally overflow mapcounts into these bits and have
>> them wrongly be detected as page types.
>>
>> This is just very fragile.
>
> Okay. Thanks for the explanation. Plus, the adjustment I mentioned
> might not be as simple as I thought it'd be.
>
> So sorry about the noise. I'm a zombie now. I'll think about it after
> some rest.
It's a shame we didn't get reports earlier that we do have some vm_insert_page()
users :(
--
Cheers,
David
next prev parent reply other threads:[~2026-05-18 9:34 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-24 5:13 [PATCH v4] mm: introduce a new page type for page pool in page type Byungchul Park
2026-02-25 7:19 ` Mike Rapoport
2026-02-26 18:49 ` Johannes Weiner
2026-03-16 22:29 ` Byungchul Park
2026-03-16 22:31 ` [PATCH v5] " Byungchul Park
2026-03-17 9:20 ` Jesper Dangaard Brouer
2026-03-17 10:03 ` Ilias Apalodimas
2026-03-17 11:06 ` Dragos Tatulea
2026-03-19 23:31 ` Jakub Kicinski
2026-03-18 2:02 ` Byungchul Park
2026-03-20 11:44 ` Jesper Dangaard Brouer
2026-03-23 12:16 ` Ilias Apalodimas
2026-03-19 23:31 ` Jakub Kicinski
2026-05-13 9:00 ` [PATCH v4] " Dragos Tatulea
2026-05-13 9:12 ` Vlastimil Babka (SUSE)
2026-05-13 9:26 ` Pedro Falcato
2026-05-13 9:36 ` David Hildenbrand (Arm)
2026-05-13 12:06 ` Dragos Tatulea
2026-05-13 12:11 ` David Hildenbrand (Arm)
2026-05-14 8:54 ` Byungchul Park
2026-05-14 9:24 ` Dragos Tatulea
2026-05-15 0:01 ` Byungchul Park
2026-05-13 9:34 ` David Hildenbrand (Arm)
2026-05-13 12:18 ` Byungchul Park
2026-05-13 12:29 ` David Hildenbrand (Arm)
2026-05-13 12:39 ` Byungchul Park
2026-05-13 13:02 ` David Hildenbrand (Arm)
2026-05-13 13:26 ` Byungchul Park
2026-05-18 9:33 ` David Hildenbrand (Arm) [this message]
2026-05-13 9:42 ` Lorenzo Stoakes
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