From: David Hildenbrand <david@redhat.com>
To: "Christoph Lameter (Ampere)" <cl@gentwo.org>,
Nico Pache <npache@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-doc@vger.kernel.org, ziy@nvidia.com,
baolin.wang@linux.alibaba.com, lorenzo.stoakes@oracle.com,
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sunnanyong@huawei.com, vishal.moola@gmail.com,
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richard.weiyang@gmail.com, lance.yang@linux.dev, vbabka@suse.cz,
rppt@kernel.org, jannh@google.com, pfalcato@suse.de,
Bagas Sanjaya <bagasdotme@gmail.com>
Subject: Re: [PATCH v12 mm-new 15/15] Documentation: mm: update the admin guide for mTHP collapse
Date: Wed, 22 Oct 2025 22:22:08 +0200 [thread overview]
Message-ID: <ed0887eb-6124-44ab-9d1f-1e87e9640e14@redhat.com> (raw)
In-Reply-To: <bba40f08-1b87-6b57-0e10-6e96e4d7bde6@gentwo.org>
On 22.10.25 21:52, Christoph Lameter (Ampere) wrote:
> On Wed, 22 Oct 2025, Nico Pache wrote:
>
>> Currently, madvise_collapse only supports collapsing to PMD-sized THPs +
>> and does not attempt mTHP collapses. +
>
> madvise collapse is frequently used as far as I can tell from the THP
> loads being tested. Could we support madvise collapse for mTHP?
The big question is still how user space can communicate the desired
order, and how we can not break existing users.
So I guess there will definitely be some support to trigger collapse to
mTHP in the future, the big question is through which interface. So it
will happen after this series.
Maybe through process_madvise() where we have an additional parameter, I
think that was what people discussed in the past.
--
Cheers
David / dhildenb
next prev parent reply other threads:[~2025-10-22 20:22 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-22 18:37 [PATCH v12 mm-new 00/15] khugepaged: mTHP support Nico Pache
2025-10-22 18:37 ` [PATCH v12 mm-new 01/15] khugepaged: rename hpage_collapse_* to collapse_* Nico Pache
2025-11-08 1:42 ` Wei Yang
2025-10-22 18:37 ` [PATCH v12 mm-new 02/15] introduce collapse_single_pmd to unify khugepaged and madvise_collapse Nico Pache
2025-10-27 9:00 ` Lance Yang
2025-10-27 15:44 ` Lorenzo Stoakes
2025-11-08 1:44 ` Wei Yang
2025-10-22 18:37 ` [PATCH v12 mm-new 03/15] khugepaged: generalize hugepage_vma_revalidate for mTHP support Nico Pache
2025-10-27 9:02 ` Lance Yang
2025-11-08 1:54 ` Wei Yang
2025-10-22 18:37 ` [PATCH v12 mm-new 04/15] khugepaged: generalize alloc_charge_folio() Nico Pache
2025-10-27 9:05 ` Lance Yang
2025-11-08 2:34 ` Wei Yang
2025-10-22 18:37 ` [PATCH v12 mm-new 05/15] khugepaged: generalize __collapse_huge_page_* for mTHP support Nico Pache
2025-10-27 9:17 ` Lance Yang
2025-10-27 16:00 ` Lorenzo Stoakes
2025-11-08 3:01 ` Wei Yang
2025-10-22 18:37 ` [PATCH v12 mm-new 06/15] khugepaged: introduce collapse_max_ptes_none helper function Nico Pache
2025-10-27 17:53 ` Lorenzo Stoakes
2025-10-28 10:09 ` Baolin Wang
2025-10-28 13:57 ` Nico Pache
2025-10-28 17:07 ` Lorenzo Stoakes
2025-10-28 17:56 ` David Hildenbrand
2025-10-28 18:09 ` Lorenzo Stoakes
2025-10-28 18:17 ` David Hildenbrand
2025-10-28 18:41 ` Lorenzo Stoakes
2025-10-29 15:04 ` David Hildenbrand
2025-10-29 18:41 ` Lorenzo Stoakes
2025-10-29 21:10 ` Nico Pache
2025-10-30 18:03 ` Lorenzo Stoakes
2025-10-29 20:45 ` Nico Pache
2025-10-28 13:36 ` Nico Pache
2025-10-28 14:15 ` David Hildenbrand
2025-10-28 17:29 ` Lorenzo Stoakes
2025-10-28 17:36 ` Lorenzo Stoakes
2025-10-28 18:08 ` David Hildenbrand
2025-10-28 18:59 ` Lorenzo Stoakes
2025-10-28 19:08 ` Lorenzo Stoakes
2025-10-29 2:09 ` Baolin Wang
2025-10-29 2:49 ` Nico Pache
2025-10-29 18:55 ` Lorenzo Stoakes
2025-10-29 21:14 ` Nico Pache
2025-10-30 1:15 ` Baolin Wang
2025-10-29 2:47 ` Nico Pache
2025-10-29 18:58 ` Lorenzo Stoakes
2025-10-29 21:23 ` Nico Pache
2025-10-30 10:15 ` Lorenzo Stoakes
2025-10-31 11:12 ` David Hildenbrand
2025-10-28 16:57 ` Lorenzo Stoakes
2025-10-28 17:49 ` David Hildenbrand
2025-10-28 17:59 ` Lorenzo Stoakes
2025-10-22 18:37 ` [PATCH v12 mm-new 07/15] khugepaged: generalize collapse_huge_page for mTHP collapse Nico Pache
2025-10-27 3:25 ` Baolin Wang
2025-11-06 18:14 ` Lorenzo Stoakes
2025-11-07 3:09 ` Dev Jain
2025-11-07 9:18 ` Lorenzo Stoakes
2025-11-07 19:33 ` Nico Pache
2025-10-22 18:37 ` [PATCH v12 mm-new 08/15] khugepaged: skip collapsing mTHP to smaller orders Nico Pache
2025-10-22 18:37 ` [PATCH v12 mm-new 09/15] khugepaged: add per-order mTHP collapse failure statistics Nico Pache
2025-11-06 18:45 ` Lorenzo Stoakes
2025-11-07 17:14 ` Nico Pache
2025-10-22 18:37 ` [PATCH v12 mm-new 10/15] khugepaged: improve tracepoints for mTHP orders Nico Pache
2025-10-22 18:37 ` [PATCH v12 mm-new 11/15] khugepaged: introduce collapse_allowable_orders helper function Nico Pache
2025-11-06 18:49 ` Lorenzo Stoakes
2025-11-07 18:01 ` Nico Pache
2025-10-22 18:37 ` [PATCH v12 mm-new 12/15] khugepaged: Introduce mTHP collapse support Nico Pache
2025-10-27 6:28 ` Baolin Wang
2025-11-09 2:08 ` Wei Yang
2025-10-22 18:37 ` [PATCH v12 mm-new 13/15] khugepaged: avoid unnecessary mTHP collapse attempts Nico Pache
2025-11-09 2:40 ` Wei Yang
2025-10-22 18:37 ` [PATCH v12 mm-new 14/15] khugepaged: run khugepaged for all orders Nico Pache
2025-10-22 18:37 ` [PATCH v12 mm-new 15/15] Documentation: mm: update the admin guide for mTHP collapse Nico Pache
2025-10-22 19:52 ` Christoph Lameter (Ampere)
2025-10-22 20:22 ` David Hildenbrand [this message]
2025-10-23 8:00 ` Lorenzo Stoakes
2025-10-23 8:44 ` Pedro Falcato
2025-10-24 13:54 ` Zach O'Keefe
2025-10-23 23:41 ` Christoph Lameter (Ampere)
2025-10-22 20:13 ` [PATCH v12 mm-new 00/15] khugepaged: mTHP support Andrew Morton
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