From: "David Hildenbrand (Arm)" <david@kernel.org>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Gregory Price <gourry@gourry.net>,
linux-kernel@vger.kernel.org,
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,
Johannes Weiner <hannes@cmpxchg.org>, Zi Yan <ziy@nvidia.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Mike Rapoport <rppt@kernel.org>,
"Matthew Wilcox (Oracle)" <willy@infradead.org>,
Muchun Song <muchun.song@linux.dev>,
Oscar Salvador <osalvador@suse.de>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Nico Pache <npache@redhat.com>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
Matthew Brost <matthew.brost@intel.com>,
Joshua Hahn <joshua.hahnjy@gmail.com>,
Rakie Kim <rakie.kim@sk.com>, Byungchul Park <byungchul@sk.com>,
Ying Huang <ying.huang@linux.alibaba.com>,
Alistair Popple <apopple@nvidia.com>,
Hugh Dickins <hughd@google.com>,
Christoph Lameter <cl@gentwo.org>,
David Rientjes <rientjes@google.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
Harry Yoo <harry.yoo@oracle.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>,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH RFC v3 01/19] mm: thread user_addr through page allocator for cache-friendly zeroing
Date: Thu, 23 Apr 2026 17:54:26 +0200 [thread overview]
Message-ID: <1ab6e58f-d984-4bae-a343-1b0d3c973ad0@kernel.org> (raw)
In-Reply-To: <20260423104120-mutt-send-email-mst@kernel.org>
On 4/23/26 16:46, Michael S. Tsirkin wrote:
> On Thu, Apr 23, 2026 at 04:13:50PM +0200, David Hildenbrand (Arm) wrote:
>> But really, that hugetlb code is rather messy. I'd vote for leaving hugetlb
>> alone on a v1, and focusing on non-hugetlb first.
>
> I just dislike it when things are non orthogonal.
> People are used to: hugetlb = same perf as THP but more predictable at the cost
> of being harder to use and using more resources.
> Here, suddenly, we have an optimization but only for THP.
Note that we also didn't care about user_alloc_needs_zeroing() with hugetlb so far.
It's not that it cannot be done with hugetlb, it's just a question about how it
can be done more cleanly; and that requires more work to clean the hugetlb part up.
Best done separately.
--
Cheers,
David
next prev parent reply other threads:[~2026-04-23 15:54 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-21 22:01 [PATCH RFC v3 00/19] mm/virtio: skip redundant zeroing of host-zeroed reported pages Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 01/19] mm: thread user_addr through page allocator for cache-friendly zeroing Michael S. Tsirkin
2026-04-22 19:47 ` Gregory Price
2026-04-22 20:32 ` Michael S. Tsirkin
2026-04-22 21:20 ` Michael S. Tsirkin
2026-04-23 4:31 ` Gregory Price
2026-04-23 9:46 ` David Hildenbrand (Arm)
2026-04-23 11:57 ` Michael S. Tsirkin
2026-04-23 13:42 ` Gregory Price
2026-04-23 14:13 ` David Hildenbrand (Arm)
2026-04-23 14:46 ` Michael S. Tsirkin
2026-04-23 15:54 ` David Hildenbrand (Arm) [this message]
2026-04-23 16:13 ` Michael S. Tsirkin
2026-04-23 14:57 ` Gregory Price
2026-04-21 22:01 ` [PATCH RFC v3 02/19] mm: add folio_zero_user stub for configs without THP/HUGETLBFS Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 03/19] mm: page_alloc: move prep_compound_page before post_alloc_hook Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 04/19] mm: use folio_zero_user for user pages in post_alloc_hook Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 05/19] mm: use __GFP_ZERO in vma_alloc_zeroed_movable_folio Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 06/19] mm: use __GFP_ZERO in alloc_anon_folio Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 07/19] mm: use __GFP_ZERO in vma_alloc_anon_folio_pmd Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 08/19] mm: hugetlb: use __GFP_ZERO and skip zeroing for zeroed pages Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 09/19] mm: memfd: skip zeroing for zeroed hugetlb pool pages Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 10/19] mm: remove arch vma_alloc_zeroed_movable_folio overrides Michael S. Tsirkin
2026-04-22 6:54 ` Geert Uytterhoeven
2026-04-22 21:29 ` Greg Ungerer
2026-04-21 22:01 ` [PATCH RFC v3 11/19] mm: page_alloc: propagate PageReported flag across buddy splits Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 12/19] mm: page_reporting: skip redundant zeroing of host-zeroed reported pages Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 13/19] virtio_balloon: a hack to enable host-zeroed page optimization Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 14/19] mm: page_reporting: add flush parameter with page budget Michael S. Tsirkin
2026-04-21 22:01 ` [PATCH RFC v3 15/19] mm: add free_frozen_pages_zeroed Michael S. Tsirkin
2026-04-21 22:02 ` [PATCH RFC v3 16/19] mm: add put_page_zeroed and folio_put_zeroed Michael S. Tsirkin
2026-04-21 22:02 ` [PATCH RFC v3 17/19] mm: page_alloc: clear PG_zeroed on buddy merge if not both zero Michael S. Tsirkin
2026-04-21 22:02 ` [PATCH RFC v3 18/19] mm: page_alloc: preserve PG_zeroed in page_del_and_expand Michael S. Tsirkin
2026-04-21 22:02 ` [PATCH RFC v3 19/19] virtio_balloon: mark deflated pages as zeroed Michael S. Tsirkin
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