The patch titled
Subject: mm: memory_hotplug: remove head variable in do_migrate_range()
has been added to the -mm mm-unstable branch. Its filename is
mm-memory_hotplug-remove-head-variable-in-do_migrate_range.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memory_hotplug-remove-head-variable-in-do_migrate_range.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Subject: mm: memory_hotplug: remove head variable in do_migrate_range()
Date: Fri, 16 Aug 2024 17:04:31 +0800
Patch series "mm: memory_hotplug: improve do_migrate_range()", v2.
Unify hwpoisoned page handling and isolation of HugeTLB/LRU/non-LRU
movable page, also convert to use folios in do_migrate_range().
This patch (of 2):
Directly use a folio for HugeTLB and THP when calculate the next pfn, then
remove unused head variable.
Link: https://lkml.kernel.org/r/20240816090435.888946-1-wangkefeng.wang@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20240816090435.888946-2-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Naoya Horiguchi <nao.horiguchi@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory_hotplug.c | 22 ++++++++++++++--------
1 file changed, 14 insertions(+), 8 deletions(-)
--- a/mm/memory_hotplug.c~mm-memory_hotplug-remove-head-variable-in-do_migrate_range
+++ a/mm/memory_hotplug.c
@@ -1773,7 +1773,7 @@ found:
static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
{
unsigned long pfn;
- struct page *page, *head;
+ struct page *page;
LIST_HEAD(source);
static DEFINE_RATELIMIT_STATE(migrate_rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
@@ -1786,14 +1786,20 @@ static void do_migrate_range(unsigned lo
continue;
page = pfn_to_page(pfn);
folio = page_folio(page);
- head = &folio->page;
- if (PageHuge(page)) {
- pfn = page_to_pfn(head) + compound_nr(head) - 1;
- isolate_hugetlb(folio, &source);
- continue;
- } else if (PageTransHuge(page))
- pfn = page_to_pfn(head) + thp_nr_pages(page) - 1;
+ /*
+ * The folio hold no reference or lock, it might be changed
+ * concurrently(eg, split), folio_nr_pages() may read garbage,
+ * but out loop could handle that as it revisits the split
+ * folio later.
+ */
+ if (folio_test_large(folio)) {
+ pfn = folio_pfn(folio) + folio_nr_pages(folio) - 1;
+ if (folio_test_hugetlb(folio)) {
+ isolate_hugetlb(folio);
+ continue;
+ }
+ }
/*
* HWPoison pages have elevated reference counts so the migration would
_
Patches currently in -mm which might be from wangkefeng.wang@xxxxxxxxxx are
mm-hugetlb-remove-left-over-comment-about-follow_huge_foo.patch
mm-memory_hotplug-remove-head-variable-in-do_migrate_range.patch
mm-memory-failure-add-unmap_posioned_folio.patch
mm-memory_hotplug-check-hwpoisoned-page-firstly-in-do_migrate_range.patch
mm-migrate-add-isolate_folio_to_list.patch
mm-memory_hotplug-unify-huge-lru-non-lru-movable-folio-isolation.patch
