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From: Andrew Morton <akpm@linux-foundation.org>
To: Muchun Song <songmuchun@bytedance.com>
Cc: Oscar Salvador <osalvador@suse.de>,
	David Hildenbrand <david@kernel.org>,
	Mike Rapoport <rppt@kernel.org>,
	Vlastimil Babka <vbabka@kernel.org>,
	Lorenzo Stoakes <ljs@kernel.org>, Michal Hocko <mhocko@suse.com>,
	David Laight <david.laight.linux@gmail.com>,
	"Liam R . Howlett" <liam@infradead.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Qi Zheng <qi.zheng@linux.dev>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Muchun Song <muchun.song@linux.dev>
Subject: Re: [PATCH v5 00/17] mm: Introduce section-based vmemmap optimization for HugeTLB
Date: Thu, 27 Aug 2026 21:20:57 -0700	[thread overview]
Message-ID: <20260827212057.37cf374d95450d325e5fce63@linux-foundation.org> (raw)
In-Reply-To: <20260825084608.47437-1-songmuchun@bytedance.com>

On Tue, 25 Aug 2026 16:45:51 +0800 Muchun Song <songmuchun@bytedance.com> wrote:

> HugeTLB vmemmap optimization currently has its own early boot setup
> path. It pre-populates optimized vmemmap mappings before the normal
> sparse-vmemmap population code runs, and sparsemem carries
> SPARSEMEM_VMEMMAP_PREINIT only to support that special case.
> 
> That makes the HugeTLB vmemmap optimization path harder to share with
> other users of sparse-vmemmap optimization and leaves a fair amount of
> HugeTLB-specific boot-time state in the generic memory initialization
> flow.
> 
> This series introduces section-based vmemmap optimization support in
> the sparse-vmemmap code and switches HugeTLB bootmem pages over to it.
> Instead of having HugeTLB pre-populate optimized vmemmap mappings
> itself, HugeTLB now records the compound page order in the corresponding
> memory sections. The generic sparse-vmemmap population path can then
> allocate or reuse shared tail vmemmap pages based on section metadata.

Thanks, I've added this to mm.git's mm-new branch.  After -rc1 I'll
move it into the mm-unstable branch, and thereby into linux-next.


  parent reply	other threads:[~2026-08-28  4:21 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-25  8:45 [PATCH v5 00/17] mm: Introduce section-based vmemmap optimization for HugeTLB Muchun Song
2026-08-25  8:45 ` [PATCH v5 01/17] mm/sparse: relax struct mem_section size constraints Muchun Song
2026-09-09  9:33   ` David Hildenbrand (Arm)
2026-08-25  8:45 ` [PATCH v5 02/17] mm/sparse-vmemmap: rename HVO order macros Muchun Song
2026-08-25 10:05   ` Qi Zheng
2026-08-25  8:45 ` [PATCH v5 03/17] mm/mm_init: skip initializing shared vmemmap tail pages Muchun Song
2026-08-25  9:30   ` Mike Rapoport
2026-08-25 10:15   ` Qi Zheng
2026-09-09  9:36   ` David Hildenbrand (Arm)
2026-09-09 11:30     ` Muchun Song
2026-08-25  8:45 ` [PATCH v5 04/17] mm/sparse-vmemmap: initialize shared tail vmemmap pages on allocation Muchun Song
2026-08-25  9:30   ` Mike Rapoport
2026-08-25 10:40   ` Qi Zheng
2026-09-09  9:39   ` David Hildenbrand (Arm)
2026-09-09 12:49     ` Muchun Song
2026-08-25  8:45 ` [PATCH v5 05/17] mm/sparse-vmemmap: support section-based vmemmap accounting Muchun Song
2026-08-25 10:47   ` Qi Zheng
2026-08-25  8:45 ` [PATCH v5 06/17] mm/mm_init: factor out pfn_to_zone() Muchun Song
2026-08-25 10:51   ` Qi Zheng
2026-08-25  8:45 ` [PATCH v5 07/17] mm/sparse-vmemmap: move helpers ahead of future callers Muchun Song
2026-08-25 10:54   ` Qi Zheng
2026-08-25  8:45 ` [PATCH v5 08/17] mm/sparse-vmemmap: support section-based vmemmap optimization Muchun Song
2026-08-25  9:30   ` Mike Rapoport
2026-08-25 12:38   ` Qi Zheng
2026-08-25  8:46 ` [PATCH v5 09/17] mm/sparse: initialize memory sections earlier Muchun Song
2026-08-25 12:49   ` Qi Zheng
2026-09-09  9:56   ` David Hildenbrand (Arm)
2026-09-09 12:29     ` Muchun Song
2026-09-09 12:48       ` David Hildenbrand (Arm)
2026-09-09 12:58         ` Muchun Song
2026-08-25  8:46 ` [PATCH v5 10/17] mm/hugetlb: switch HugeTLB to section-based vmemmap optimization Muchun Song
2026-08-25 13:12   ` Qi Zheng
2026-08-26  2:38     ` Muchun Song
2026-08-26  3:24       ` Qi Zheng
2026-09-09  9:58   ` David Hildenbrand (Arm)
2026-09-09 13:08     ` Muchun Song
2026-09-09 13:39       ` David Hildenbrand (Arm)
2026-08-25  8:46 ` [PATCH v5 11/17] mm/sparse-vmemmap: remove SPARSEMEM_VMEMMAP_PREINIT support Muchun Song
2026-08-25 13:16   ` Qi Zheng
2026-09-09  9:59   ` David Hildenbrand (Arm)
2026-08-25  8:46 ` [PATCH v5 12/17] mm/sparse: inline usemap allocation into sparse_init_nid() Muchun Song
2026-09-09 10:01   ` David Hildenbrand (Arm)
2026-08-25  8:46 ` [PATCH v5 13/17] mm/sparse: remove section_map_size() Muchun Song
2026-09-09 10:02   ` David Hildenbrand (Arm)
2026-08-25  8:46 ` [PATCH v5 14/17] mm/hugetlb: remove HUGE_BOOTMEM_HVO Muchun Song
2026-08-25 13:28   ` Qi Zheng
2026-08-25  8:46 ` [PATCH v5 15/17] mm/hugetlb: remove HUGE_BOOTMEM_CMA Muchun Song
2026-08-25 13:42   ` Qi Zheng
2026-08-25  8:46 ` [PATCH v5 16/17] mm/hugetlb: localize struct huge_bootmem_page Muchun Song
2026-08-25 13:38   ` Qi Zheng
2026-08-25  8:46 ` [PATCH v5 17/17] mm/hugetlb: localize HUGE_BOOTMEM_ZONES_VALID Muchun Song
2026-08-25 13:40   ` Qi Zheng
2026-08-28  4:20 ` Andrew Morton [this message]
2026-09-09  9:31 ` [PATCH v5 00/17] mm: Introduce section-based vmemmap optimization for HugeTLB David Hildenbrand (Arm)

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