From: "David Hildenbrand (Red Hat)" <david@kernel.org>
To: dan.j.williams@intel.com, Jonathan Cameron <jonathan.cameron@huawei.com>
Cc: Li Zhe <lizhe.67@bytedance.com>,
akpm@linux-foundation.org, ankur.a.arora@oracle.com,
fvdl@google.com, joao.m.martins@oracle.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
mhocko@suse.com, mjguzik@gmail.com, muchun.song@linux.dev,
osalvador@suse.de, raghavendra.kt@amd.com,
linux-cxl@vger.kernel.org, Davidlohr Bueso <dave@stgolabs.net>,
Gregory Price <gourry@gourry.net>,
zhanjie9@hisilicon.com, wangzhou1@hisilicon.com
Subject: Re: [PATCH v2 0/8] Introduce a huge-page pre-zeroing mechanism
Date: Thu, 15 Jan 2026 21:22:28 +0100 [thread overview]
Message-ID: <65cdc2fa-b6ba-4422-9537-feb7d3a33210@kernel.org> (raw)
In-Reply-To: <69694b06835e_34d2a100b3@dwillia2-mobl4.notmuch>
On 1/15/26 21:16, dan.j.williams@intel.com wrote:
> David Hildenbrand (Red Hat) wrote:
> [..]
>>> Give me a list of 1Gig pages and this stuff becomes much more efficient
>>> than anything the CPU can do.
>>
>> Right, and ideally we'd implement any such mechanisms in a way that more
>> parts of the kernel can benefit, and not just an unloved in-memory
>> file-system that most people just want to get rid of as soon as we can :)
>
> CPUs have tended to eat the value of simple DMA offload operations like
> copy/zero over time.
>
> In the case of this patch there is no async-offload benefit because
> userspace is already charged with spawning more threads if it wants more
> parallelism.
In this subthread we're discussing handling that in the kernel like
init_on_free. So when user space frees a hugetlb folio (or in the
future, other similarly gigantic folios from another allocator), we'd be
zeroing it.
If it would be freeing multiple such folios, we could pack them and send
them to a DMA engine to zero them for us (concurrently? asynchronously?
I don't know :) )
--
Cheers
David
next prev parent reply other threads:[~2026-01-15 20:22 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-07 11:31 Li Zhe
2026-01-07 11:31 ` [PATCH v2 1/8] mm/hugetlb: add pre-zeroed framework Li Zhe
2026-01-07 11:31 ` [PATCH v2 2/8] mm/hugetlb: convert to prep_account_new_hugetlb_folio() Li Zhe
2026-01-07 11:31 ` [PATCH v2 3/8] mm/hugetlb: move the huge folio to the end of the list during enqueue Li Zhe
2026-01-07 11:31 ` [PATCH v2 4/8] mm/hugetlb: introduce per-node sysfs interface "zeroable_hugepages" Li Zhe
2026-01-07 11:31 ` [PATCH v2 5/8] mm/hugetlb: simplify function hugetlb_sysfs_add_hstate() Li Zhe
2026-01-07 11:31 ` [PATCH v2 6/8] mm/hugetlb: relocate the per-hstate struct kobject pointer Li Zhe
2026-01-07 11:31 ` [PATCH v2 7/8] mm/hugetlb: add epoll support for interface "zeroable_hugepages" Li Zhe
2026-01-07 11:31 ` [PATCH v2 8/8] mm/hugetlb: limit event generation frequency of function do_zero_free_notify() Li Zhe
2026-01-07 16:19 ` [PATCH v2 0/8] Introduce a huge-page pre-zeroing mechanism Andrew Morton
2026-01-12 11:25 ` Li Zhe
2026-01-09 6:05 ` Muchun Song
2026-01-12 11:27 ` Li Zhe
2026-01-12 19:52 ` David Hildenbrand (Red Hat)
2026-01-13 6:37 ` Li Zhe
2026-01-13 10:15 ` David Hildenbrand (Red Hat)
2026-01-13 12:41 ` Li Zhe
2026-01-14 10:41 ` David Hildenbrand (Red Hat)
2026-01-14 11:36 ` Li Zhe
2026-01-14 11:55 ` David Hildenbrand (Red Hat)
2026-01-14 12:11 ` Mateusz Guzik
2026-01-14 12:33 ` David Hildenbrand (Red Hat)
2026-01-14 12:41 ` David Hildenbrand (Red Hat)
2026-01-14 13:06 ` Mateusz Guzik
2026-01-14 17:21 ` David Hildenbrand (Red Hat)
2026-01-15 9:36 ` Li Zhe
2026-01-15 11:08 ` David Hildenbrand (Red Hat)
2026-01-15 11:57 ` Jonathan Cameron
2026-01-15 17:08 ` David Hildenbrand (Red Hat)
2026-01-15 20:16 ` dan.j.williams
2026-01-15 20:22 ` David Hildenbrand (Red Hat) [this message]
2026-01-15 22:30 ` Ankur Arora
2026-01-20 6:27 ` Li Zhe
2026-01-20 9:47 ` David Laight
2026-01-20 10:39 ` Li Zhe
2026-01-20 18:18 ` Gregory Price
2026-01-20 18:38 ` Gregory Price
2026-01-20 19:30 ` David Laight
2026-01-20 19:52 ` Gregory Price
2026-01-21 8:03 ` Li Zhe
2026-01-21 12:41 ` David Hildenbrand (Red Hat)
2026-01-21 12:32 ` David Hildenbrand (Red Hat)
2026-01-12 22:00 ` Ankur Arora
2026-01-13 6:39 ` Li Zhe
2026-01-12 22:01 ` Ankur Arora
2026-01-13 6:41 ` Li Zhe
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