From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Kiryl Shutsemau (Meta)" <kas@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Matthew Wilcox <willy@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Lorenzo Stoakes <ljs@kernel.org>, Jan Kara <jack@suse.cz>,
Hugh Dickins <hughd@google.com>,
Christian Brauner <brauner@kernel.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Harry Yoo <harry@kernel.org>, Miklos Szeredi <miklos@szeredi.hu>,
Miaohe Lin <linmiaohe@huawei.com>,
Naoya Horiguchi <nao.horiguchi@gmail.com>,
Oscar Salvador <osalvador@suse.de>,
"Liam R. Howlett" <liam@infradead.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Brendan Jackman <brendan.jackman@linux.dev>,
Johannes Weiner <hannes@cmpxchg.org>, Zi Yan <ziy@nvidia.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Nico Pache <nico.pache@linux.dev>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
Usama Arif <usama.arif@linux.dev>,
Kairui Song <kasong@tencent.com>, Qi Zheng <qi.zheng@linux.dev>,
Shakeel Butt <shakeel.butt@linux.dev>,
Axel Rasmussen <axelrasmussen@google.com>,
Yuanchu Xie <yuanchu@google.com>, Wei Xu <weixugc@google.com>,
Baoquan He <baoquan.he@linux.dev>,
"Paul E. McKenney" <paulmck@kernel.org>,
Pedro Falcato <pfalcato@suse.de>,
Luis Chamberlain <mcgrof@kernel.org>,
Ilya Gladyshev <ilya.gladyshev@linux.dev>,
Jaegeuk Kim <jaegeuk@kernel.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, fuse-devel@lists.linux.dev,
kernel-team@meta.com
Subject: Re: [RFC PATCH v2 03/18] fuse: don't move a folio with PG_rcu_free into a fuse file
Date: Mon, 9 Nov 2026 18:48:39 +0100 [thread overview]
Message-ID: <befbf3e1-d25d-42fc-86df-e4b695b017a2@kernel.org> (raw)
In-Reply-To: <CAHk-=whhp=Q8qR+wPoM9+mxYPQ_OXMOEoKmT7J0JZikFZusuqw@mail.gmail.com>
On 11/9/26 17:35, Linus Torvalds wrote:
> On Mon, 9 Nov 2026 at 08:28, Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
>>
>> On Mon, 9 Nov 2026 at 06:46, David Hildenbrand (Arm) <david@kernel.org> wrote:
>>>
>>> Could we get rid of fuse_try_move_folio() entirely?
>>
>> Please. That would be great.
>
> .. and in a similar vein, we should get rid of splice doing the same entirely.
>
> Kirly's patch to just remove page_cache_pipe_buf_try_steal() entirely
> (ok, it was originally mine, but Kiryl took ownership of that series:
> "Tag, you're it") is worth doing, but I think worth doubling down on.
> I think we sh ould just get rid of 'try_steal' entirely. I don't think
> anybody really uses it. I think it exists in fuse and in the virtio
> console, and neither is worth it.
>
> Removing pipe_buf_try_steal() would basically remove all of
> fuse_try_move_folio().
>
> Conversely, removing fuse_try_move_folio() would make
> pipe_buf_try_steal() even less useful than it is now.
>
> Just remove them both. Good riddance.
Yes, that would be very nice.
--
Cheers,
David
next prev parent reply other threads:[~2026-11-09 17:48 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-04 13:00 [RFC PATCH v2 00/18] mm: read the page cache without folio references Kiryl Shutsemau (Meta)
2026-11-04 13:00 ` [RFC PATCH v2 01/18] mm: free PG_rcu_free folios only after an RCU grace period Kiryl Shutsemau (Meta)
2026-11-05 20:37 ` David Hildenbrand (Arm)
2026-11-06 10:23 ` Kiryl Shutsemau
2026-11-09 14:42 ` David Hildenbrand (Arm)
2026-11-09 15:56 ` Linus Torvalds
2026-11-09 17:23 ` David Hildenbrand (Arm)
2026-11-09 18:01 ` Linus Torvalds
2026-11-11 10:03 ` David Hildenbrand (Arm)
2026-11-12 12:26 ` Kiryl Shutsemau
2026-11-12 12:32 ` David Hildenbrand (Arm)
2026-11-04 13:00 ` [RFC PATCH v2 02/18] splice: don't steal page cache folios Kiryl Shutsemau (Meta)
2026-11-04 16:05 ` David Hildenbrand (Arm)
2026-11-05 14:55 ` Kiryl Shutsemau
2026-11-04 13:00 ` [RFC PATCH v2 03/18] fuse: don't move a folio with PG_rcu_free into a fuse file Kiryl Shutsemau (Meta)
2026-11-09 14:46 ` David Hildenbrand (Arm)
2026-11-09 16:28 ` Linus Torvalds
2026-11-09 16:35 ` Linus Torvalds
2026-11-09 17:48 ` David Hildenbrand (Arm) [this message]
2026-11-10 13:58 ` Kiryl Shutsemau
2026-11-04 13:01 ` [RFC PATCH v2 04/18] mm: count the pages waiting for a grace period Kiryl Shutsemau (Meta)
2026-11-09 14:48 ` David Hildenbrand (Arm)
2026-11-04 13:01 ` [RFC PATCH v2 05/18] mm: expedite the grace period when a CPU has many deferred frees Kiryl Shutsemau (Meta)
2026-11-04 13:01 ` [RFC PATCH v2 06/18] mm: free the pages waiting for a grace period before OOM Kiryl Shutsemau (Meta)
2026-11-05 13:03 ` sashiko-bot
2026-11-12 12:53 ` Kiryl Shutsemau
2026-11-04 13:01 ` [RFC PATCH v2 07/18] mm: free the pages waiting for a grace period before isolation fails Kiryl Shutsemau (Meta)
2026-11-05 13:03 ` sashiko-bot
2026-11-12 14:28 ` Kiryl Shutsemau
2026-11-04 13:01 ` [RFC PATCH v2 08/18] mm/compaction: free the migrated folios that wait for a grace period Kiryl Shutsemau (Meta)
2026-11-05 13:03 ` sashiko-bot
2026-11-12 14:46 ` Kiryl Shutsemau
2026-11-04 13:01 ` [RFC PATCH v2 09/18] mm/memory-failure: handle folios with PG_rcu_free Kiryl Shutsemau (Meta)
2026-11-05 13:03 ` sashiko-bot
2026-11-12 14:59 ` Kiryl Shutsemau
2026-11-04 13:01 ` [RFC PATCH v2 10/18] mm: have folio_mark_accessed() return whether the folio is hot Kiryl Shutsemau (Meta)
2026-11-04 13:01 ` [RFC PATCH v2 11/18] mm/filemap: mark a folio accessed in one place in filemap_read() Kiryl Shutsemau (Meta)
2026-11-04 13:01 ` [RFC PATCH v2 12/18] mm/filemap: set PG_rcu_free on the folios that reads keep coming back to Kiryl Shutsemau (Meta)
2026-11-04 13:01 ` [RFC PATCH v2 13/18] mm/filemap: read from the page cache without folio references Kiryl Shutsemau (Meta)
2026-11-04 13:01 ` [RFC PATCH v2 14/18] mm/filemap: read large folios " Kiryl Shutsemau (Meta)
2026-11-05 13:03 ` sashiko-bot
2026-11-04 13:01 ` [RFC PATCH v2 15/18] mm/filemap: don't store f_ra.prev_pos for FMODE_RANDOM files Kiryl Shutsemau (Meta)
2026-11-04 13:01 ` [RFC PATCH v2 16/18] mm/shmem: count accesses to a folio the way filemap_read() does Kiryl Shutsemau (Meta)
2026-11-04 13:01 ` [RFC PATCH v2 17/18] mm/shmem: read without folio references Kiryl Shutsemau (Meta)
2026-11-05 13:03 ` sashiko-bot
2026-11-04 13:01 ` [RFC PATCH v2 18/18] mm/filemap: add a debugfs switch for lockless page cache reads Kiryl Shutsemau (Meta)
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