From: Vernon Yang <vernon2gm@gmail.com>
To: akpm@linux-foundation.org, david@kernel.org
Cc: lorenzo.stoakes@oracle.com, ziy@nvidia.com, dev.jain@arm.com,
baohua@kernel.org, lance.yang@linux.dev, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Vernon Yang <yanglincheng@kylinos.cn>
Subject: [PATCH mm-new v4 4/6] mm: add folio_is_lazyfree helper
Date: Sun, 11 Jan 2026 20:19:07 +0800 [thread overview]
Message-ID: <20260111121909.8410-5-yanglincheng@kylinos.cn> (raw)
In-Reply-To: <20260111121909.8410-1-yanglincheng@kylinos.cn>
Add folio_is_lazyfree() function to identify lazy-free folios to improve
code readability.
Signed-off-by: Vernon Yang <yanglincheng@kylinos.cn>
---
include/linux/mm_inline.h | 5 +++++
mm/rmap.c | 2 +-
mm/vmscan.c | 5 ++---
3 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index fa2d6ba811b5..65a4ae52d915 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -35,6 +35,11 @@ static inline int page_is_file_lru(struct page *page)
return folio_is_file_lru(page_folio(page));
}
+static inline int folio_is_lazyfree(const struct folio *folio)
+{
+ return folio_test_anon(folio) && !folio_test_swapbacked(folio);
+}
+
static __always_inline void __update_lru_size(struct lruvec *lruvec,
enum lru_list lru, enum zone_type zid,
long nr_pages)
diff --git a/mm/rmap.c b/mm/rmap.c
index 336b27e00238..fd335b171ea7 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -2042,7 +2042,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
}
if (!pvmw.pte) {
- if (folio_test_anon(folio) && !folio_test_swapbacked(folio)) {
+ if (folio_is_lazyfree(folio)) {
if (unmap_huge_pmd_locked(vma, pvmw.address, pvmw.pmd, folio))
goto walk_done;
/*
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 81828fa625ed..ad3516ff1381 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -964,8 +964,7 @@ static void folio_check_dirty_writeback(struct folio *folio,
* They could be mistakenly treated as file lru. So further anon
* test is needed.
*/
- if (!folio_is_file_lru(folio) ||
- (folio_test_anon(folio) && !folio_test_swapbacked(folio))) {
+ if (!folio_is_file_lru(folio) || folio_is_lazyfree(folio)) {
*dirty = false;
*writeback = false;
return;
@@ -1506,7 +1505,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
}
}
- if (folio_test_anon(folio) && !folio_test_swapbacked(folio)) {
+ if (folio_is_lazyfree(folio)) {
/* follow __remove_mapping for reference */
if (!folio_ref_freeze(folio, 1))
goto keep_locked;
--
2.51.0
next prev parent reply other threads:[~2026-01-11 12:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-11 12:19 [PATCH mm-new v4 0/6] Improve khugepaged scan logic Vernon Yang
2026-01-11 12:19 ` [PATCH mm-new v4 1/6] mm: khugepaged: add trace_mm_khugepaged_scan event Vernon Yang
2026-01-11 13:49 ` Lance Yang
2026-01-11 12:19 ` [PATCH mm-new v4 2/6] mm: khugepaged: refine scan progress number Vernon Yang
2026-01-11 12:19 ` [PATCH mm-new v4 3/6] mm: khugepaged: just skip when the memory has been collapsed Vernon Yang
2026-01-11 12:19 ` Vernon Yang [this message]
2026-01-11 13:41 ` [PATCH mm-new v4 4/6] mm: add folio_is_lazyfree helper Lance Yang
2026-01-11 12:19 ` [PATCH mm-new v4 5/6] mm: khugepaged: skip lazy-free folios at scanning Vernon Yang
2026-01-11 12:19 ` [PATCH mm-new v4 6/6] mm: khugepaged: set to next mm direct when mm has MMF_DISABLE_THP_COMPLETELY Vernon Yang
2026-01-11 13:44 ` Lance Yang
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