The patch titled
Subject: mm/vmscan: fix pgdemote_* accounting with lru_gen_enabled
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-vmscan-fix-pgdemote_-accounting-with-lru_gen_enabled.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmscan-fix-pgdemote_-accounting-with-lru_gen_enabled.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: Li Zhijian <lizhijian@xxxxxxxxxxx>
Subject: mm/vmscan: fix pgdemote_* accounting with lru_gen_enabled
Date: Fri, 10 Jan 2025 20:21:33 +0800
Commit f77f0c751478 ("mm,memcg: provide per-cgroup counters for NUMA
balancing operations") moved the accounting of PGDEMOTE_* statistics to
shrink_inactive_list(). However, shrink_inactive_list() is not called
when lrugen_enabled is true, leading to incorrect demotion statistics
despite actual demotion events occurring.
Add the PGDEMOTE_* accounting in evict_folios(), ensuring that demotion
statistics are correctly updated regardless of the lru_gen_enabled state.
This fix is crucial for systems that rely on accurate NUMA balancing
metrics for performance tuning and resource management.
Link: https://lkml.kernel.org/r/20250110122133.423481-2-lizhijian@xxxxxxxxxxx
Fixes: f77f0c751478 ("mm,memcg: provide per-cgroup counters for NUMA balancing operations")
Signed-off-by: Li Zhijian <lizhijian@xxxxxxxxxxx>
Cc: Kaiyang Zhao <kaiyang2@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/vmscan.c~mm-vmscan-fix-pgdemote_-accounting-with-lru_gen_enabled
+++ a/mm/vmscan.c
@@ -4649,6 +4649,8 @@ retry:
__mod_lruvec_state(lruvec, PGDEMOTE_KSWAPD + reclaimer_offset(),
stat.nr_demoted);
+ __mod_lruvec_state(lruvec, PGDEMOTE_KSWAPD + reclaimer_offset(),
+ stat.nr_demoted);
item = PGSTEAL_KSWAPD + reclaimer_offset();
if (!cgroup_reclaim(sc))
__count_vm_events(item, reclaimed);
_
Patches currently in -mm which might be from lizhijian@xxxxxxxxxxx are
mm-vmscan-accumulate-nr_demoted-for-accurate-demotion-statistics.patch
mm-vmscan-fix-pgdemote_-accounting-with-lru_gen_enabled.patch
selftests-mm-add-a-few-missing-gitignore-files.patch
