The patch titled
Subject: mm: fix shmem THP counters on migration
has been added to the -mm mm-unstable branch. Its filename is
mm-fix-shmem-thp-counters-on-migration.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-fix-shmem-thp-counters-on-migration.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: Jan Glauber <jglauber@xxxxxxxxxxxxxxxx>
Subject: mm: fix shmem THP counters on migration
Date: Mon, 19 Jun 2023 12:33:51 +0200
The per node numa_stat values for shmem don't change on
page migration for THP:
grep shmem /sys/fs/cgroup/machine.slice/.../memory.numa_stat:
shmem N0=1092616192 N1=10485760
shmem_thp N0=1092616192 N1=10485760
migratepages 9181 0 1:
shmem N0=0 N1=1103101952
shmem_thp N0=1092616192 N1=10485760
Fix that by updating shmem_thp counters likewise to shmem counters
on page migration.
Link: https://lkml.kernel.org/r/20230619103351.234837-1-jglauber@xxxxxxxxxxxxxxxx
Signed-off-by: Jan Glauber <jglauber@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/mm/migrate.c~mm-fix-shmem-thp-counters-on-migration
+++ a/mm/migrate.c
@@ -486,6 +486,11 @@ int folio_migrate_mapping(struct address
if (folio_test_swapbacked(folio) && !folio_test_swapcache(folio)) {
__mod_lruvec_state(old_lruvec, NR_SHMEM, -nr);
__mod_lruvec_state(new_lruvec, NR_SHMEM, nr);
+
+ if (folio_test_transhuge(folio)) {
+ __mod_lruvec_state(old_lruvec, NR_SHMEM_THPS, -nr);
+ __mod_lruvec_state(new_lruvec, NR_SHMEM_THPS, nr);
+ }
}
#ifdef CONFIG_SWAP
if (folio_test_swapcache(folio)) {
_
Patches currently in -mm which might be from jglauber@xxxxxxxxxxxxxxxx are
mm-fix-shmem-thp-counters-on-migration.patch
