The patch titled
Subject: mm/shmem: shmem_replace_page() remember NR_SHMEM
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-shmem-shmem_replace_page-remember-nr_shmem.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-shmem-shmem_replace_page-remember-nr_shmem.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Hugh Dickins <hughd@xxxxxxxxxx>
Subject: mm/shmem: shmem_replace_page() remember NR_SHMEM
Date: Wed, 10 Aug 2022 22:06:33 -0700 (PDT)
Elsewhere, NR_SHMEM is updated at the same time as shmem NR_FILE_PAGES;
but shmem_replace_page() was forgetting to do that - so NR_SHMEM stats
could grow too big or too small, in those unusual cases when it's used.
Link: https://lkml.kernel.org/r/cec7c09d-5874-e160-ada6-6e10ee48784@xxxxxxxxxx
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: "Darrick J. Wong" <djwong@xxxxxxxxxx>
Cc: Radoslaw Burny <rburny@xxxxxxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/shmem.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/shmem.c~mm-shmem-shmem_replace_page-remember-nr_shmem
+++ a/mm/shmem.c
@@ -1659,7 +1659,9 @@ static int shmem_replace_page(struct pag
new = page_folio(newpage);
mem_cgroup_migrate(old, new);
__inc_lruvec_page_state(newpage, NR_FILE_PAGES);
+ __inc_lruvec_page_state(newpage, NR_SHMEM);
__dec_lruvec_page_state(oldpage, NR_FILE_PAGES);
+ __dec_lruvec_page_state(oldpage, NR_SHMEM);
}
xa_unlock_irq(&swap_mapping->i_pages);
_
Patches currently in -mm which might be from hughd@xxxxxxxxxx are
mm-shmem-fix-chattr-fsflags-support-in-tmpfs.patch
mm-shmem-tmpfs-fallocate-use-file_modified.patch
mm-shmem-shmem_replace_page-remember-nr_shmem.patch
