+ mm-mglru-return-for-unavailable-anon-reclaim-earlier.patch added to mm-new branch

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

The patch titled
     Subject: mm/mglru: return for unavailable anon reclaim earlier
has been added to the -mm mm-new branch.  Its filename is
     mm-mglru-return-for-unavailable-anon-reclaim-earlier.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mglru-return-for-unavailable-anon-reclaim-earlier.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
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Kairui Song <kasong@tencent.com>
Subject: mm/mglru: return for unavailable anon reclaim earlier
Date: Sat, 14 Nov 2026 02:55:31 +0800

No feature change, just shuffle some code, prepare for later commits.

Link: https://lore.kernel.org/20261113185541.70203-7-baohua@kernel.org
Signed-off-by: Kairui Song <kasong@tencent.com>
Signed-off-by: Barry Song (Xiaomi) <baohua@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Kunwu Chan <kunwu.chan@gmail.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: <hui.zhu@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: wang lian <lianux.mm@gmail.com>
Cc: <liuxiang.277@bytedance.com>
Cc: <lyugaofei@xiaomi.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Qi Zheng <qi.zheng@linux.dev>
Cc: Ridong Chen <ridong.chen@linux.dev>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Kairui Song <ryncsn@gmail.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: wangzicheng <wangzicheng@honor.com>
Cc: Wei Xu <weixugc@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Cc: Bo Zhang <zhangbo56@xiaomi.com>
Cc: Hui Zhu <zhuhui@kylinos.cn>
Cc: Siddharth Chintamaneni <sidchintamaneni@gmail.com>
Cc: Kunwu Chan <chentao@kylinos.cn>
Cc: Bo Zhang <zhangbo0325@gmail.com>
---

 mm/vmscan.c |   27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

--- a/mm/vmscan.c~mm-mglru-return-for-unavailable-anon-reclaim-earlier
+++ a/mm/vmscan.c
@@ -5060,20 +5060,6 @@ static long get_nr_to_scan(struct lruvec
 			   struct mem_cgroup *memcg, int swappiness)
 {
 	unsigned long nr_to_scan, evictable, sizes[ANON_AND_FILE];
-	struct pglist_data *pgdat = lruvec_pgdat(lruvec);
-
-	/*
-	 * Proactive reclaim initiated by userspace for anonymous memory only.
-	 * SWAPPINESS_ANON_ONLY is set only on the proactive reclaim path, so
-	 * warn if it shows up elsewhere. When anon cannot be reclaimed (e.g.
-	 * no swap), return 0 to skip the scan entirely, avoiding useless scan
-	 * work when there is nothing eligible to reclaim.
-	 */
-	if (swappiness == SWAPPINESS_ANON_ONLY) {
-		WARN_ON_ONCE(!sc->proactive);
-		if (!can_reclaim_anon_pages(memcg, pgdat->node_id, sc))
-			return 0;
-	}
 
 	lruvec_evictable_size(lruvec, swappiness, sizes);
 	evictable = sizes[LRU_GEN_ANON] + sizes[LRU_GEN_FILE];
@@ -5126,6 +5112,19 @@ static bool try_to_shrink_lruvec(struct
 	int swappiness = get_swappiness(lruvec, sc);
 	struct mem_cgroup *memcg = lruvec_memcg(lruvec);
 
+	/*
+	 * Proactive reclaim initiated by userspace for anonymous memory only.
+	 * SWAPPINESS_ANON_ONLY is set only on the proactive reclaim path, so
+	 * warn if it shows up elsewhere. When anon cannot be reclaimed (e.g.
+	 * no swap), return 0 to skip the scan entirely, avoiding useless scan
+	 * work when there is nothing eligible to reclaim.
+	 */
+	if (swappiness == SWAPPINESS_ANON_ONLY) {
+		WARN_ON_ONCE(!sc->proactive);
+		if (!can_reclaim_anon_pages(memcg, lruvec_pgdat(lruvec)->node_id, sc))
+			return false;
+	}
+
 	nr_to_scan = get_nr_to_scan(lruvec, sc, memcg, swappiness);
 	while (nr_to_scan > 0) {
 		int delta;
_

Patches currently in -mm which might be from kasong@tencent.com are

mm-mglru-report-evictable-sizes-per-type.patch
mm-mglru-extract-lruvec_populated_min_seq-helper.patch
mm-mglru-reclaim-from-the-oldest-populated-gen.patch
mm-mglru-lift-the-forced-protection-of-reclaimer.patch
mm-mglru-skip-zones-above-reclaim_idx-instead-of-rotating-them.patch
mm-mglru-return-for-unavailable-anon-reclaim-earlier.patch
mm-mglru-balance-anon-and-file-scan-budget-by-refault-rate.patch
mm-mglru-lift-youngest-gen-protection-for-higher-priority.patch