From: "David Hildenbrand (Arm)" <david@kernel.org>
To: "Michael S. Tsirkin" <mst@redhat.com>, linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@kernel.org>,
Brendan Jackman <jackmanb@google.com>,
Michal Hocko <mhocko@suse.com>,
Suren Baghdasaryan <surenb@google.com>,
Jason Wang <jasowang@redhat.com>,
Andrea Arcangeli <aarcange@redhat.com>,
linux-mm@kvack.org, virtualization@lists.linux.dev,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Mike Rapoport <rppt@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>, Zi Yan <ziy@nvidia.com>,
Chris Li <chrisl@kernel.org>, Kairui Song <kasong@tencent.com>,
Kemeng Shi <shikemeng@huaweicloud.com>,
Nhat Pham <nphamcs@gmail.com>, Baoquan He <bhe@redhat.com>,
Barry Song <baohua@kernel.org>,
Axel Rasmussen <axelrasmussen@google.com>,
Yuanchu Xie <yuanchu@google.com>, Wei Xu <weixugc@google.com>
Subject: Re: [PATCH RFC v2 17/18] mm: add free_frozen_pages_hint and put_page_hint APIs
Date: Tue, 21 Apr 2026 12:56:00 +0200 [thread overview]
Message-ID: <5f76af6e-9818-42ea-a305-c0fc1d920dca@kernel.org> (raw)
In-Reply-To: <c7094de807c0e963526686e1d245bc76193b1a92.1776689093.git.mst@redhat.com>
On 4/20/26 14:51, Michael S. Tsirkin wrote:
> Add free_frozen_pages_hint(page, order, hints) to free a page
> while marking it as pre-zeroed when PGHINT_ZEROED is set.
> The PG_zeroed flag is set after __free_pages_prepare so it
> survives on the free list.
>
> Add __folio_put_hint(), folio_put_hint(), and put_page_hint()
> wrappers for the put_page path.
Can we defer that change?
Putting a page with a hint, when there might still be other users of the
page is a weird interface.
In the long term, all balloon pages (PG_offline pages) will be frozen
pages, and definitely not folios.
Frozen pages don't have a refcount.
It would then be sufficient to have the single owner of the page call
something like free_frozen_zeroed_page().
Now, to convert balloon pages to be frozen requires some more work,
primarily to balloon migration handling, unfortunately. I have it on my
todo list, but it will take a while.
--
Cheers,
David
next prev parent reply other threads:[~2026-04-21 10:56 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-20 12:51 [PATCH RFC v2 00/18] mm/virtio: skip redundant zeroing of host-zeroed reported pages Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 01/18] mm: page_alloc: propagate PageReported flag across buddy splits Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 02/18] mm: add pghint_t type and vma_alloc_folio_hints API Michael S. Tsirkin
2026-04-21 0:58 ` Huang, Ying
2026-04-20 12:50 ` [PATCH RFC v2 03/18] mm: add PG_zeroed page flag for known-zero pages Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 04/18] mm: page_alloc: track PG_zeroed across buddy merges Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 05/18] mm: page_alloc: preserve PG_zeroed in try_to_claim_block Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 06/18] mm: page_alloc: thread pghint_t through get_page_from_freelist Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 07/18] mm: post_alloc_hook: use PG_zeroed to skip zeroing, return pghint_t Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 08/18] mm: hugetlb: thread pghint_t through buddy allocation chain Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 09/18] mm: hugetlb: use PG_zeroed for pool pages, skip redundant zeroing Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 10/18] mm: page_reporting: support host-zeroed reported pages Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 11/18] mm: skip zeroing in vma_alloc_zeroed_movable_folio for pre-zeroed pages Michael S. Tsirkin
2026-04-21 10:58 ` David Hildenbrand (Arm)
2026-04-21 11:12 ` David Hildenbrand (Arm)
2026-04-21 11:25 ` David Hildenbrand (Arm)
2026-04-20 12:50 ` [PATCH RFC v2 12/18] mm: skip zeroing in alloc_anon_folio " Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 13/18] mm: skip zeroing in vma_alloc_anon_folio_pmd " Michael S. Tsirkin
2026-04-20 12:50 ` [PATCH RFC v2 14/18] mm: memfd: skip zeroing for pre-zeroed hugetlb pages Michael S. Tsirkin
2026-04-20 12:51 ` [PATCH RFC v2 15/18] virtio_balloon: add host_zeroes_pages module parameter Michael S. Tsirkin
2026-04-20 12:51 ` [PATCH RFC v2 16/18] mm: page_reporting: add flush parameter with page budget Michael S. Tsirkin
2026-04-20 12:51 ` [PATCH RFC v2 17/18] mm: add free_frozen_pages_hint and put_page_hint APIs Michael S. Tsirkin
2026-04-21 10:56 ` David Hildenbrand (Arm) [this message]
2026-04-20 12:51 ` [PATCH RFC v2 18/18] virtio_balloon: mark deflated pages as pre-zeroed Michael S. Tsirkin
2026-04-20 18:09 ` [syzbot ci] Re: mm/virtio: skip redundant zeroing of host-zeroed reported pages syzbot ci
2026-04-20 18:20 ` [PATCH RFC v2 00/18] " David Hildenbrand (Arm)
2026-04-20 23:33 ` Michael S. Tsirkin
2026-04-21 2:38 ` Gregory Price
2026-04-21 10:04 ` David Hildenbrand (Arm)
2026-04-21 10:50 ` David Hildenbrand (Arm)
2026-04-21 2:21 ` Gregory Price
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