The patch titled
Subject: mm: migrate: add isolate_folio_to_list()
has been added to the -mm mm-unstable branch. Its filename is
mm-migrate-add-isolate_folio_to_list.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-migrate-add-isolate_folio_to_list.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: migrate: add isolate_folio_to_list()
Date: Fri, 16 Aug 2024 17:04:34 +0800
Add isolate_folio_to_list() helper to try to isolate HugeTLB, no-LRU
movable and LRU folios to a list, which will be reused by
do_migrate_range() from memory hotplug soon, also drop the
mf_isolate_folio() since we could directly use new helper in the
soft_offline_in_use_page().
Link: https://lkml.kernel.org/r/20240816090435.888946-5-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Acked-by: 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>
---
include/linux/migrate.h | 3 ++
mm/memory-failure.c | 46 +++++++++-----------------------------
mm/migrate.c | 27 ++++++++++++++++++++++
3 files changed, 41 insertions(+), 35 deletions(-)
--- a/include/linux/migrate.h~mm-migrate-add-isolate_folio_to_list
+++ a/include/linux/migrate.h
@@ -70,6 +70,7 @@ int migrate_pages(struct list_head *l, n
unsigned int *ret_succeeded);
struct folio *alloc_migration_target(struct folio *src, unsigned long private);
bool isolate_movable_page(struct page *page, isolate_mode_t mode);
+bool isolate_folio_to_list(struct folio *folio, struct list_head *list);
int migrate_huge_page_move_mapping(struct address_space *mapping,
struct folio *dst, struct folio *src);
@@ -91,6 +92,8 @@ static inline struct folio *alloc_migrat
{ return NULL; }
static inline bool isolate_movable_page(struct page *page, isolate_mode_t mode)
{ return false; }
+static inline bool isolate_folio_to_list(struct folio *folio, struct list_head *list)
+ { return false; }
static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
struct folio *dst, struct folio *src)
--- a/mm/memory-failure.c~mm-migrate-add-isolate_folio_to_list
+++ a/mm/memory-failure.c
@@ -2652,40 +2652,6 @@ EXPORT_SYMBOL(unpoison_memory);
#undef pr_fmt
#define pr_fmt(fmt) "Soft offline: " fmt
-static bool mf_isolate_folio(struct folio *folio, struct list_head *pagelist)
-{
- bool isolated = false;
-
- if (folio_test_hugetlb(folio)) {
- isolated = isolate_hugetlb(folio, pagelist);
- } else {
- bool lru = !__folio_test_movable(folio);
-
- if (lru)
- isolated = folio_isolate_lru(folio);
- else
- isolated = isolate_movable_page(&folio->page,
- ISOLATE_UNEVICTABLE);
-
- if (isolated) {
- list_add(&folio->lru, pagelist);
- if (lru)
- node_stat_add_folio(folio, NR_ISOLATED_ANON +
- folio_is_file_lru(folio));
- }
- }
-
- /*
- * If we succeed to isolate the folio, we grabbed another refcount on
- * the folio, so we can safely drop the one we got from get_any_page().
- * If we failed to isolate the folio, it means that we cannot go further
- * and we will return an error, so drop the reference we got from
- * get_any_page() as well.
- */
- folio_put(folio);
- return isolated;
-}
-
/*
* soft_offline_in_use_page handles hugetlb-pages and non-hugetlb pages.
* If the page is a non-dirty unmapped page-cache page, it simply invalidates.
@@ -2737,7 +2703,7 @@ static int soft_offline_in_use_page(stru
return 0;
}
- if (mf_isolate_folio(folio, &pagelist)) {
+ if (isolate_folio_to_list(folio, &pagelist)) {
ret = migrate_pages(&pagelist, alloc_migration_target, NULL,
(unsigned long)&mtc, MIGRATE_SYNC, MR_MEMORY_FAILURE, NULL);
if (!ret) {
@@ -2759,6 +2725,16 @@ static int soft_offline_in_use_page(stru
pfn, msg_page[huge], page_count(page), &page->flags);
ret = -EBUSY;
}
+
+ /*
+ * If we succeed to isolate the folio, we grabbed another refcount on
+ * the folio, so we can safely drop the one we got from get_any_page().
+ * If we failed to isolate the folio, it means that we cannot go further
+ * and we will return an error, so drop the reference we got from
+ * get_any_page() as well.
+ */
+ folio_put(folio);
+
return ret;
}
--- a/mm/migrate.c~mm-migrate-add-isolate_folio_to_list
+++ a/mm/migrate.c
@@ -137,6 +137,33 @@ static void putback_movable_folio(struct
folio_clear_isolated(folio);
}
+/* Must be called with an elevated refcount on the non-hugetlb folio */
+bool isolate_folio_to_list(struct folio *folio, struct list_head *list)
+{
+ bool isolated = false;
+
+ if (folio_test_hugetlb(folio)) {
+ isolated = isolate_hugetlb(folio, list);
+ } else {
+ bool lru = !__folio_test_movable(folio);
+
+ if (lru)
+ isolated = folio_isolate_lru(folio);
+ else
+ isolated = isolate_movable_page(&folio->page,
+ ISOLATE_UNEVICTABLE);
+
+ if (isolated) {
+ list_add(&folio->lru, list);
+ if (lru)
+ node_stat_add_folio(folio, NR_ISOLATED_ANON +
+ folio_is_file_lru(folio));
+ }
+ }
+
+ return isolated;
+}
+
/*
* Put previously isolated pages back onto the appropriate lists
* from where they were once taken off for compaction/migration.
_
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
