From: sashiko-bot@kernel.org
To: "David Hildenbrand (Arm)" <david@kernel.org>
Cc: linux-s390@vger.kernel.org, "Heiko Carstens" <hca@linux.ibm.com>,
"Vasily Gorbik" <gor@linux.ibm.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>
Subject: Re: [PATCH 05/15] mm/hugetlb: keep surplus folios when the pool shrinks
Date: Thu, 29 Oct 2026 20:16:30 +0000 [thread overview]
Message-ID: <sashiko-outbox-189905@kernel.org> (raw)
In-Reply-To: <20261028-fixes_hugetlb-v1-5-a0a033db180f@kernel.org>
> From: Josef Bacik <josef@toxicpanda.com>
>
> Surplus folios are accounted per node. When shrinking the pool,
> set_max_huge_pages() removes free folios through
> remove_pool_hugetlb_folio() and accounts them as persistent folios.
>
> It can select a node whose folios are all surplus and leave its surplus
> count larger than its total count. Free surplus folios can back
> reservations created by gather_surplus_pages().
>
> For example, with nr_overcommit_hugepages = 8 on two nodes:
>
> (node columns show total/free/surplus)
>
> total free surp node0 node1
> [ ... ]
> Fixes: e4e574b767ba ("hugetlb: Try to grow hugetlb pool for MAP_SHARED mappings")
> Cc: stable@kernel.org
> Signed-off-by: Josef Bacik <josef@toxicpanda.com>
> [ david: cleanup code and description ]
> Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261028-fixes_hugetlb-v1-0-a0a033db180f@kernel.org?part=5
next prev parent reply other threads:[~2026-10-29 20:16 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-28 20:13 [PATCH 00/15] mm/hugetlb: various fixes David Hildenbrand (Arm)
2026-10-28 20:13 ` [PATCH 01/15] hugetlbfs: fix integer overflow in fallocate() David Hildenbrand (Arm)
2026-10-29 3:37 ` Muchun Song
2026-10-29 9:05 ` Oscar Salvador (SUSE)
2026-10-29 20:16 ` sashiko-bot
2026-10-29 20:53 ` Ackerley Tng
2026-10-28 20:13 ` [PATCH 02/15] mm/hugetlb: compare against persistent count when freeing lowmem folios David Hildenbrand (Arm)
2026-10-29 3:39 ` Muchun Song
2026-10-29 20:16 ` sashiko-bot
2026-10-28 20:13 ` [PATCH 03/15] mm/hugetlb: preserve reservations when shrinking on HIGHMEM David Hildenbrand (Arm)
2026-10-29 3:41 ` Muchun Song
2026-10-29 20:16 ` sashiko-bot
2026-10-28 20:13 ` [PATCH 04/15] mm/hugetlb: account temporary folios separately David Hildenbrand (Arm)
2026-10-29 20:16 ` sashiko-bot
2026-10-30 9:07 ` Muchun Song
2026-10-28 20:13 ` [PATCH 05/15] mm/hugetlb: keep surplus folios when the pool shrinks David Hildenbrand (Arm)
2026-10-29 3:51 ` Muchun Song
2026-10-29 20:16 ` sashiko-bot [this message]
2026-10-28 20:13 ` [PATCH 06/15] mm/hugetlb: fix mremap() racing with page migration David Hildenbrand (Arm)
2026-10-29 20:16 ` sashiko-bot
2026-10-30 9:20 ` Muchun Song
2026-10-28 20:13 ` [PATCH 07/15] hugetlbfs: fix unmapping folios from private VMAs David Hildenbrand (Arm)
2026-10-29 20:16 ` sashiko-bot
2026-10-30 9:39 ` Muchun Song
2026-10-28 20:13 ` [PATCH 08/15] mm/hugetlb: serialize page-cache allocations with truncation David Hildenbrand (Arm)
2026-10-29 20:16 ` sashiko-bot
2026-10-28 20:13 ` [PATCH 09/15] mm/memfd: recheck the page cache before allocating a hugetlb folio David Hildenbrand (Arm)
2026-10-29 20:16 ` sashiko-bot
2026-10-28 20:13 ` [PATCH 10/15] mm/hugetlb: count again if the reserve map shrank David Hildenbrand (Arm)
2026-10-29 20:16 ` sashiko-bot
2026-10-28 20:13 ` [PATCH 11/15] hugetlbfs: do not grow a sealed file in mmap() David Hildenbrand (Arm)
2026-10-29 20:16 ` sashiko-bot
2026-10-28 20:13 ` [PATCH 12/15] mm/hugetlb: keep surplus folios that are reserved David Hildenbrand (Arm)
2026-10-29 20:16 ` sashiko-bot
2026-10-28 20:13 ` [PATCH 13/15] mm/hugetlb: fix reservation leak on min_size= mounts David Hildenbrand (Arm)
2026-10-29 20:16 ` sashiko-bot
2026-10-28 20:13 ` [PATCH 14/15] RFC: mm/hugetlb: account restored reservations before freeing folios David Hildenbrand (Arm)
2026-10-29 20:16 ` sashiko-bot
2026-10-28 20:13 ` [PATCH 15/15] RFC: mm/hugetlb: delay anon folio rmap removal until after the TLB flush David Hildenbrand (Arm)
2026-10-29 20:16 ` sashiko-bot
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