From: Lance Yang <lance.yang@linux.dev>
To: songmuchun@bytedance.com
Cc: osalvador@suse.de, akpm@linux-foundation.org, rppt@kernel.org,
qi.zheng@linux.dev, lance.yang@linux.dev, jthoughton@google.com,
david@kernel.org, muchun.song@linux.dev, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 04/12] mm: hugetlb_vmemmap: generalize vmemmap page allocation
Date: Thu, 22 Oct 2026 21:54:55 +0800 [thread overview]
Message-ID: <20261022135455.90168-1-lance.yang@linux.dev> (raw)
In-Reply-To: <20261020115824.823278-3-songmuchun@bytedance.com>
On Tue, Oct 20, 2026 at 07:58:16PM +0800, Muchun Song wrote:
>Vmemmap page allocation is currently tied to restoring a virtual range
>and assumes an empty destination list. These constraints prevent it from
>being reused when pages are requested independently of a vmemmap range or
>appended to an existing list.
Yeah, the local list makes sense to me :)
>Generalize the allocator and give it an all-or-nothing list contract so
>the restore and optimization paths can share the same allocation policy.
>This also allows HVO head-page allocation to fail gracefully under memory
>pressure without triggering the OOM killer.
And __GFP_RETRY_MAYFAIL for the head page seems reasonable too. Just skip
the optimization if we can't allocate it.
>Signed-off-by: Muchun Song <songmuchun@bytedance.com>
>---
Reviewed-by: Lance Yang <lance.yang@linux.dev>
next prev parent reply other threads:[~2026-10-22 13:55 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-20 11:52 [PATCH 00/12] mm: Decouple folio-based vmemmap optimization from HugeTLB Muchun Song
2026-10-20 11:52 ` [PATCH 01/12] mm: hugetlb_vmemmap: remove HugeTLB-specific vmemmap optimization macros Muchun Song
2026-10-22 3:43 ` Lance Yang
2026-10-20 11:58 ` [PATCH 02/12] mm: hugetlb_vmemmap: unify VMEMMAP_{SPLIT,REMAP}_NO_TLB_FLUSH Muchun Song
2026-10-20 11:58 ` [PATCH 03/12] mm: hugetlb_vmemmap: simplify vmemmap head page handling Muchun Song
2026-10-22 6:24 ` Lance Yang
2026-10-22 6:27 ` Muchun Song
2026-10-22 7:23 ` Lance Yang
2026-10-20 11:58 ` [PATCH 04/12] mm: hugetlb_vmemmap: generalize vmemmap page allocation Muchun Song
2026-10-22 13:54 ` Lance Yang [this message]
2026-10-20 11:58 ` [PATCH 05/12] mm: hugetlb_vmemmap: unify writable vmemmap page preparation Muchun Song
2026-10-22 14:13 ` Lance Yang
2026-10-20 11:58 ` [PATCH 06/12] mm: hugetlb_vmemmap: rename vmemmap_remap_pte() to vmemmap_optimize_pte() Muchun Song
2026-10-23 0:55 ` Lance Yang
2026-10-20 11:58 ` [PATCH 07/12] mm: hugetlb_vmemmap: simplify shared tail page handling Muchun Song
2026-10-23 2:20 ` Lance Yang
2026-10-23 2:32 ` Muchun Song
2026-10-20 11:58 ` [PATCH 08/12] mm: hugetlb_vmemmap: move alloc_vmemmap_page_list() next to its free helper Muchun Song
2026-10-23 2:47 ` Lance Yang
2026-10-20 11:58 ` [PATCH 09/12] mm: hugetlb_vmemmap: make vmemmap optimization folio-oriented Muchun Song
2026-10-23 3:39 ` Lance Yang
2026-10-20 11:58 ` [PATCH 10/12] mm: hugetlb_vmemmap: make vmemmap restoration folio-oriented Muchun Song
2026-10-23 3:46 ` Lance Yang
2026-10-23 3:58 ` Muchun Song
2026-10-20 11:58 ` [PATCH 11/12] mm: hugetlb_vmemmap: unify vmemmap range restoration Muchun Song
2026-10-23 3:53 ` Lance Yang
2026-10-20 11:58 ` [PATCH 12/12] mm: hugetlb_vmemmap: make vmemmap PTE conversion folio-oriented Muchun Song
2026-10-23 7:33 ` Lance Yang
2026-10-22 3:52 ` [PATCH 02/12] mm: hugetlb_vmemmap: unify VMEMMAP_{SPLIT,REMAP}_NO_TLB_FLUSH Lance Yang
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