From: Dev Jain <dev.jain@arm.com>
To: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org,
chrisl@kernel.org, kasong@tencent.com, hughd@google.com,
liam@infradead.org
Cc: riel@surriel.com, vbabka@kernel.org, harry@kernel.org,
jannh@google.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, rppt@kernel.org, surenb@google.com,
mhocko@suse.com, qi.zheng@linux.dev, shakeel.butt@linux.dev,
baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com,
weixugc@google.com, shikemeng@huaweicloud.com, nphamcs@gmail.com,
bhe@redhat.com, youngjun.park@lge.com,
baolin.wang@linux.alibaba.com, pfalcato@suse.de,
ryan.roberts@arm.com, anshuman.khandual@arm.com
Subject: Re: [PATCH v4 00/12] Optimize anonymous large folio unmapping
Date: Thu, 28 May 2026 22:20:02 +0530 [thread overview]
Message-ID: <f8d10097-95d9-446c-bf9b-6590c543370c@arm.com> (raw)
In-Reply-To: <20260526063635.61721-1-dev.jain@arm.com>
Sashiko:
Patch 9:
About anon-exclusivity: At this point, the batched helper is not
called with nr_pages > 1. Later, anon-exclusive uniformity is
handled.
On PUD folio: that is never passed to folio_try_share_anon_rmap.
I was following the pattern followed elsewhere, given that
PUD THP is not supported yet. Although there is no harm in
changing the check to (level != PGTABLE_LEVEL_PTE).
On hugetlb folio: that is never passed.
Patch 11:
Existing bug: doesn't look like it. uffd-wp is not there for
a migration-writable softleaf entry.
Patch 12:
ABout sparc64: Yep I'll change this to #ifdef or something. Apparently
is_defined() doesn't work in case the macro doesn't have a value.
About dirty young and uffd-wp bits: we don't care about dirty and young
bits since we are converting to swap ptes. uff-wp uniformity is preserved
through folio_pte_batch.
About stale nr_pages: The patch initializing nr_pages = 1 at the start of
the loop is already in mm-hotfixes.
About O(N): Yes I will update this to retain the nr_pages == folio_nr_pages()
early bail out.
next prev parent reply other threads:[~2026-05-28 16:50 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-26 6:36 Dev Jain
2026-05-26 6:36 ` [PATCH v4 01/12] mm/rmap: convert page -> folio for hwpoison checks Dev Jain
2026-06-09 13:44 ` David Hildenbrand (Arm)
2026-06-10 7:02 ` Dev Jain
2026-06-10 12:13 ` David Hildenbrand (Arm)
2026-05-26 6:36 ` [PATCH v4 02/12] mm/rmap: Add try_to_unmap_hugetlb_one Dev Jain
2026-06-09 14:16 ` David Hildenbrand (Arm)
2026-06-18 7:44 ` Lance Yang
2026-06-18 7:55 ` David Hildenbrand (Arm)
2026-06-18 9:09 ` Lance Yang
2026-06-18 9:43 ` David Hildenbrand (Arm)
2026-06-18 10:01 ` Lance Yang
2026-06-22 8:13 ` Dev Jain
2026-06-22 8:14 ` Lance Yang
2026-06-22 8:14 ` Dev Jain
2026-06-22 8:17 ` David Hildenbrand (Arm)
2026-06-24 5:50 ` Dev Jain
2026-06-24 6:58 ` Lance Yang
2026-06-23 8:40 ` Dev Jain
2026-06-23 11:49 ` David Hildenbrand (Arm)
2026-07-09 7:16 ` Garg, Shivank
2026-07-09 8:58 ` Dev Jain
2026-07-09 9:20 ` Garg, Shivank
2026-07-09 9:24 ` Dev Jain
2026-05-26 6:36 ` [PATCH v4 03/12] mm/rmap: refactor some code around lazyfree folio unmapping Dev Jain
2026-06-09 14:20 ` David Hildenbrand (Arm)
2026-06-23 8:42 ` Dev Jain
2026-06-29 12:30 ` David Hildenbrand (Arm)
2026-05-26 6:36 ` [PATCH v4 04/12] mm/memory: Batch set uffd-wp markers during zapping Dev Jain
2026-06-16 13:43 ` David Hildenbrand (Arm)
2026-06-23 10:01 ` Dev Jain
2026-06-27 9:00 ` Dev Jain
2026-07-07 13:47 ` David Hildenbrand (Arm)
2026-05-26 6:36 ` [PATCH v4 05/12] mm/rmap: batch unmap folios belonging to uffd-wp VMAs Dev Jain
2026-05-26 6:36 ` [PATCH v4 06/12] mm/swap: rename subpage->page in folio_dup_swap/folio_put_swap Dev Jain
2026-06-16 13:47 ` David Hildenbrand (Arm)
2026-05-26 6:36 ` [PATCH v4 07/12] mm/swapfile: Add batched version of folio_dup_swap Dev Jain
2026-06-16 13:50 ` David Hildenbrand (Arm)
2026-06-16 13:51 ` David Hildenbrand (Arm)
2026-05-26 6:36 ` [PATCH v4 08/12] mm/swapfile: Add batched version of folio_put_swap Dev Jain
2026-06-16 13:54 ` David Hildenbrand (Arm)
2026-06-23 10:03 ` Dev Jain
2026-05-26 6:36 ` [PATCH v4 09/12] mm/rmap: Add batched version of folio_try_share_anon_rmap_pte Dev Jain
2026-06-16 14:04 ` David Hildenbrand (Arm)
2026-06-23 10:05 ` Dev Jain
2026-05-26 6:36 ` [PATCH v4 10/12] mm/rmap: refactor anon folio unmap in try_to_unmap_one Dev Jain
2026-06-16 14:10 ` David Hildenbrand (Arm)
2026-06-23 11:01 ` Dev Jain
2026-05-26 6:36 ` [PATCH v4 11/12] mm/mprotect: drop 'sub' from page_anon_exclusive_sub_batch Dev Jain
2026-06-16 14:12 ` David Hildenbrand (Arm)
2026-06-23 11:02 ` Dev Jain
2026-05-26 6:36 ` [PATCH v4 12/12] mm/rmap: enable batch unmapping of anonymous folios Dev Jain
2026-05-28 16:50 ` Dev Jain [this message]
2026-06-09 13:24 ` [PATCH v4 00/12] Optimize anonymous large folio unmapping David Hildenbrand (Arm)
2026-06-09 14:18 ` David Hildenbrand (Arm)
2026-06-23 11:04 ` Dev Jain
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