+ mm-mglru-update-mg-lru-proactive-reclaim-statistics-only-to-memcg.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/mglru: update MG-LRU proactive reclaim statistics only to memcg
has been added to the -mm mm-new branch.  Its filename is
     mm-mglru-update-mg-lru-proactive-reclaim-statistics-only-to-memcg.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mglru-update-mg-lru-proactive-reclaim-statistics-only-to-memcg.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
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fixup patches in mm-new.

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------------------------------------------------------
From: Hao Jia <jiahao1@lixiang.com>
Subject: mm/mglru: update MG-LRU proactive reclaim statistics only to memcg
Date: Thu, 17 Jul 2025 16:28:45 +0800

Users can use /sys/kernel/debug/lru_gen to trigger proactive memory
reclaim of a specified memcg.  Currently, statistics such as pgrefill,
pgscan and pgsteal will be updated to the /proc/vmstat system memory
statistics.

This will confuse some system memory pressure monitoring tools, making it
difficult to determine whether pgscan and pgsteal are caused by
system-level pressure or by proactive memory reclaim of some specific
memory cgroup.

Therefore, make this interface behave similarly to memory.reclaim.  Update
proactive memory reclaim statistics only to its memory cgroup.

Link: https://lkml.kernel.org/r/20250717082845.34673-1-jiahao.kernel@gmail.com
Signed-off-by: Hao Jia <jiahao1@lixiang.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kinsey Ho <kinseyho@google.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Yuanchu Xie <yuanchu@google.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmscan.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/mm/vmscan.c~mm-mglru-update-mg-lru-proactive-reclaim-statistics-only-to-memcg
+++ a/mm/vmscan.c
@@ -5561,6 +5561,7 @@ static int run_cmd(char cmd, int memcg_i
 	if (memcg_id != mem_cgroup_id(memcg))
 		goto done;
 
+	sc->target_mem_cgroup = memcg;
 	lruvec = get_lruvec(memcg, nid);
 
 	if (swappiness < MIN_SWAPPINESS)
@@ -5597,6 +5598,7 @@ static ssize_t lru_gen_seq_write(struct
 		.may_swap = true,
 		.reclaim_idx = MAX_NR_ZONES - 1,
 		.gfp_mask = GFP_KERNEL,
+		.proactive = true,
 	};
 
 	buf = kvmalloc(len + 1, GFP_KERNEL);
_

Patches currently in -mm which might be from jiahao1@lixiang.com are

mm-mglru-stop-try_to_inc_min_seq-if-min_seq-has-not-increased.patch
mm-mglru-update-mg-lru-proactive-reclaim-statistics-only-to-memcg.patch