The patch titled
Subject: vmscan: convert lazy freeing to folios
has been added to the -mm mm-unstable branch. Its filename is
vmscan-convert-lazy-freeing-to-folios.patch
This patch should soon appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: vmscan: convert lazy freeing to folios
Remove a hidden call to compound_head(), and account nr_pages instead of a
single page. This matches the code in lru_lazyfree_fn() that accounts
nr_pages to PGLAZYFREE.
Link: https://lkml.kernel.org/r/20220504182857.4013401-12-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/memcontrol.h | 14 ++++++++++++++
mm/vmscan.c | 18 +++++++++---------
2 files changed, 23 insertions(+), 9 deletions(-)
--- a/include/linux/memcontrol.h~vmscan-convert-lazy-freeing-to-folios
+++ a/include/linux/memcontrol.h
@@ -1057,6 +1057,15 @@ static inline void count_memcg_page_even
count_memcg_events(memcg, idx, 1);
}
+static inline void count_memcg_folio_events(struct folio *folio,
+ enum vm_event_item idx, unsigned long nr)
+{
+ struct mem_cgroup *memcg = folio_memcg(folio);
+
+ if (memcg)
+ count_memcg_events(memcg, idx, nr);
+}
+
static inline void count_memcg_event_mm(struct mm_struct *mm,
enum vm_event_item idx)
{
@@ -1494,6 +1503,11 @@ static inline void count_memcg_page_even
{
}
+static inline void count_memcg_folio_events(struct folio *folio,
+ enum vm_event_item idx, unsigned long nr)
+{
+}
+
static inline
void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx)
{
--- a/mm/vmscan.c~vmscan-convert-lazy-freeing-to-folios
+++ a/mm/vmscan.c
@@ -1902,20 +1902,20 @@ retry:
}
}
- if (PageAnon(page) && !PageSwapBacked(page)) {
+ if (folio_test_anon(folio) && !folio_test_swapbacked(folio)) {
/* follow __remove_mapping for reference */
- if (!page_ref_freeze(page, 1))
+ if (!folio_ref_freeze(folio, 1))
goto keep_locked;
/*
- * The page has only one reference left, which is
+ * The folio has only one reference left, which is
* from the isolation. After the caller puts the
- * page back on lru and drops the reference, the
- * page will be freed anyway. It doesn't matter
- * which lru it goes. So we don't bother checking
- * PageDirty here.
+ * folio back on the lru and drops the reference, the
+ * folio will be freed anyway. It doesn't matter
+ * which lru it goes on. So we don't bother checking
+ * the dirty flag here.
*/
- count_vm_event(PGLAZYFREED);
- count_memcg_page_event(page, PGLAZYFREED);
+ count_vm_events(PGLAZYFREED, nr_pages);
+ count_memcg_folio_events(folio, PGLAZYFREED, nr_pages);
} else if (!mapping || !__remove_mapping(mapping, folio, true,
sc->target_mem_cgroup))
goto keep_locked;
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
shmem-convert-shmem_alloc_hugepage-to-use-vma_alloc_folio.patch
mm-huge_memory-convert-do_huge_pmd_anonymous_page-to-use-vma_alloc_folio.patch
alpha-fix-alloc_zeroed_user_highpage_movable.patch
mm-remove-alloc_pages_vma.patch
vmscan-use-folio_mapped-in-shrink_page_list.patch
vmscan-convert-the-writeback-handling-in-shrink_page_list-to-folios.patch
swap-turn-get_swap_page-into-folio_alloc_swap.patch
swap-convert-add_to_swap-to-take-a-folio.patch
vmscan-convert-dirty-page-handling-to-folios.patch
vmscan-convert-page-buffer-handling-to-use-folios.patch
vmscan-convert-lazy-freeing-to-folios.patch
vmscan-move-initialisation-of-mapping-down.patch
vmscan-convert-the-activate_locked-portion-of-shrink_page_list-to-folios.patch
mm-allow-can_split_folio-to-be-called-when-thp-are-disabled.patch
vmscan-remove-remaining-uses-of-page-in-shrink_page_list.patch
mm-shmem-use-a-folio-in-shmem_unused_huge_shrink.patch
mm-swap-add-folio_throttle_swaprate.patch
mm-shmem-convert-shmem_add_to_page_cache-to-take-a-folio.patch
mm-shmem-turn-shmem_should_replace_page-into-shmem_should_replace_folio.patch
mm-shmem-add-shmem_alloc_folio.patch
mm-shmem-convert-shmem_alloc_and_acct_page-to-use-a-folio.patch
mm-shmem-convert-shmem_getpage_gfp-to-use-a-folio.patch
mm-shmem-convert-shmem_swapin_page-to-shmem_swapin_folio.patch
mm-add-folio_mapping_flags.patch
mm-add-folio_test_movable.patch
mm-migrate-convert-move_to_new_page-into-move_to_new_folio.patch
