From: Baolin Wang <baolin.wang@linux.alibaba.com>
To: Nico Pache <npache@redhat.com>,
linux-mm@kvack.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org
Cc: david@redhat.com, ziy@nvidia.com, lorenzo.stoakes@oracle.com,
Liam.Howlett@oracle.com, ryan.roberts@arm.com, dev.jain@arm.com,
corbet@lwn.net, rostedt@goodmis.org, mhiramat@kernel.org,
mathieu.desnoyers@efficios.com, akpm@linux-foundation.org,
baohua@kernel.org, willy@infradead.org, peterx@redhat.com,
wangkefeng.wang@huawei.com, usamaarif642@gmail.com,
sunnanyong@huawei.com, vishal.moola@gmail.com,
thomas.hellstrom@linux.intel.com, yang@os.amperecomputing.com,
kirill.shutemov@linux.intel.com, aarcange@redhat.com,
raquini@redhat.com, anshuman.khandual@arm.com,
catalin.marinas@arm.com, tiwai@suse.de, will@kernel.org,
dave.hansen@linux.intel.com, jack@suse.cz, cl@gentwo.org,
jglisse@google.com, surenb@google.com, zokeefe@google.com,
hannes@cmpxchg.org, rientjes@google.com, mhocko@suse.com,
rdunlap@infradead.org
Subject: Re: [PATCH v7 06/12] khugepaged: introduce khugepaged_scan_bitmap for mTHP support
Date: Fri, 16 May 2025 11:20:42 +0800 [thread overview]
Message-ID: <9c54397f-3cbf-4fa2-bf69-ba89613d355f@linux.alibaba.com> (raw)
In-Reply-To: <20250515032226.128900-7-npache@redhat.com>
On 2025/5/15 11:22, Nico Pache wrote:
> khugepaged scans anons PMD ranges for potential collapse to a hugepage.
> To add mTHP support we use this scan to instead record chunks of utilized
> sections of the PMD.
>
> khugepaged_scan_bitmap uses a stack struct to recursively scan a bitmap
> that represents chunks of utilized regions. We can then determine what
> mTHP size fits best and in the following patch, we set this bitmap while
> scanning the anon PMD. A minimum collapse order of 2 is used as this is
> the lowest order supported by anon memory.
>
> max_ptes_none is used as a scale to determine how "full" an order must
> be before being considered for collapse.
>
> When attempting to collapse an order that has its order set to "always"
> lets always collapse to that order in a greedy manner without
> considering the number of bits set.
>
> Signed-off-by: Nico Pache <npache@redhat.com>
Sigh. You still haven't addressed or explained the issues I previously
raised [1], so I don't know how to review this patch again...
[1]
https://lore.kernel.org/all/83a66442-b7c7-42e7-af4e-fd211d8ed6f8@linux.alibaba.com/
next prev parent reply other threads:[~2025-05-16 3:20 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-15 3:22 [PATCH v7 00/12] khugepaged: " Nico Pache
2025-05-15 3:22 ` [PATCH v7 01/12] khugepaged: rename hpage_collapse_* to khugepaged_* Nico Pache
2025-05-16 17:30 ` Liam R. Howlett
2025-06-29 6:48 ` Nico Pache
2025-05-15 3:22 ` [PATCH v7 02/12] introduce khugepaged_collapse_single_pmd to unify khugepaged and madvise_collapse Nico Pache
2025-05-15 5:50 ` Baolin Wang
2025-05-16 11:59 ` Nico Pache
2025-05-16 17:12 ` Liam R. Howlett
2025-07-02 0:00 ` Nico Pache
2025-05-15 3:22 ` [PATCH v7 03/12] khugepaged: generalize hugepage_vma_revalidate for mTHP support Nico Pache
2025-05-16 17:14 ` Liam R. Howlett
2025-06-29 6:52 ` Nico Pache
2025-05-23 6:55 ` Baolin Wang
2025-05-28 6:57 ` Dev Jain
2025-05-29 4:00 ` Nico Pache
2025-05-30 3:02 ` Baolin Wang
2025-05-15 3:22 ` [PATCH v7 04/12] khugepaged: generalize alloc_charge_folio() Nico Pache
2025-05-15 3:22 ` [PATCH v7 05/12] khugepaged: generalize __collapse_huge_page_* for mTHP support Nico Pache
2025-05-15 3:22 ` [PATCH v7 06/12] khugepaged: introduce khugepaged_scan_bitmap " Nico Pache
2025-05-16 3:20 ` Baolin Wang [this message]
2025-05-17 6:47 ` Nico Pache
2025-05-18 3:04 ` Liam R. Howlett
2025-05-20 10:09 ` Baolin Wang
2025-05-20 10:26 ` David Hildenbrand
2025-05-21 1:03 ` Baolin Wang
2025-05-21 10:23 ` Nico Pache
2025-05-22 9:39 ` Baolin Wang
2025-05-28 9:26 ` David Hildenbrand
2025-05-28 14:04 ` Baolin Wang
2025-05-29 4:02 ` Nico Pache
2025-05-29 8:27 ` Baolin Wang
2025-05-15 3:22 ` [PATCH v7 07/12] khugepaged: add " Nico Pache
2025-06-07 6:23 ` Dev Jain
2025-06-07 12:55 ` Nico Pache
2025-06-07 13:03 ` Nico Pache
2025-06-07 14:31 ` Dev Jain
2025-06-07 14:42 ` Dev Jain
2025-05-15 3:22 ` [PATCH v7 08/12] khugepaged: skip collapsing mTHP to smaller orders Nico Pache
2025-05-15 3:22 ` [PATCH v7 09/12] khugepaged: avoid unnecessary mTHP collapse attempts Nico Pache
2025-05-15 3:22 ` [PATCH v7 10/12] khugepaged: improve tracepoints for mTHP orders Nico Pache
2025-05-15 3:22 ` [PATCH v7 11/12] khugepaged: add per-order mTHP khugepaged stats Nico Pache
2025-05-15 3:22 ` [PATCH v7 12/12] Documentation: mm: update the admin guide for mTHP collapse Nico Pache
2025-05-15 4:40 ` Randy Dunlap
2025-06-07 6:44 ` Dev Jain
2025-06-07 12:57 ` Nico Pache
2025-06-07 14:34 ` Dev Jain
2025-06-08 19:50 ` Nico Pache
2025-06-09 3:06 ` Baolin Wang
2025-06-09 5:26 ` Dev Jain
2025-06-09 6:39 ` Baolin Wang
2025-06-09 5:56 ` Nico Pache
2025-05-28 12:31 ` [PATCH 1/2] mm: khugepaged: allow khugepaged to check all anonymous mTHP orders Baolin Wang
2025-05-28 12:31 ` [PATCH 2/2] mm: khugepaged: kick khugepaged for enabling none-PMD-sized mTHPs Baolin Wang
2025-05-28 12:39 ` [PATCH v7 00/12] khugepaged: mTHP support Baolin Wang
2025-05-29 3:52 ` Nico Pache
2025-06-16 3:51 ` Dev Jain
2025-06-16 15:51 ` Nico Pache
2025-06-16 16:35 ` Dev Jain
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