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mm: add folio_test_lazyfree helper

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Add folio_test_lazyfree() function to identify lazy-free folios to improve
code readability.

Link: https://lkml.kernel.org/r/20260221093918.1456187-4-vernon2gm@gmail.com
Signed-off-by: Vernon Yang <yanglincheng@kylinos.cn>
Acked-by: David Hildenbrand (Red Hat) <david@kernel.org>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Barry Song <baohua@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Liam Howlett <Liam.Howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vernon Yang
2026-02-21 17:39:17 +08:00
committed by Andrew Morton
parent 34c1f77e4a
commit 6cc153f90b
3 changed files with 8 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/page-flags.h
View File

@@ -724,6 +724,11 @@ static __always_inline bool folio_test_anon(const struct folio *folio)
return ((unsigned long)folio->mapping & FOLIO_MAPPING_ANON) != 0;
}
static __always_inline bool folio_test_lazyfree(const struct folio *folio)
{
return folio_test_anon(folio) && !folio_test_swapbacked(folio);
}
static __always_inline bool PageAnonNotKsm(const struct page *page)
{
unsigned long flags = (unsigned long)page_folio(page)->mapping;

2
mm/rmap.c
View File

@@ -2060,7 +2060,7 @@ 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_test_lazyfree(folio)) {
if (unmap_huge_pmd_locked(vma, pvmw.address, pvmw.pmd, folio))
goto walk_done;
/*

5
mm/vmscan.c
View File

@@ -963,8 +963,7 @@ 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_test_lazyfree(folio)) {
*dirty = false;
*writeback = false;
return;
@@ -1508,7 +1507,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
}
}
if (folio_test_anon(folio) && !folio_test_swapbacked(folio)) {
if (folio_test_lazyfree(folio)) {
/* follow __remove_mapping for reference */
if (!folio_ref_freeze(folio, 1))
goto keep_locked;