[to-be-updated] mm-mglru-extract-lruvec_populated_min_seq-helper.patch removed from -mm tree

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

The quilt patch titled
     Subject: mm/mglru: extract lruvec_populated_min_seq() helper
has been removed from the -mm tree.  Its filename was
     mm-mglru-extract-lruvec_populated_min_seq-helper.patch

This patch was dropped because an updated version will be issued

------------------------------------------------------
From: Kairui Song <kasong@tencent.com>
Subject: mm/mglru: extract lruvec_populated_min_seq() helper
Date: Thu, 12 Nov 2026 07:25:49 +0800

The search for the oldest populated generation of a type, previously
embedded in try_to_inc_min_seq(), is extracted into the new
lruvec_populated_min_seq() helper. It returns the oldest populated seq
of a given type, bounded by the given max_seq so the search never goes
beyond it.

No functional change.

Link: https://lore.kernel.org/20261111232603.9934-3-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@suse.com>
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>
---

 mm/vmscan.c |   43 +++++++++++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 14 deletions(-)

--- a/mm/vmscan.c~mm-mglru-extract-lruvec_populated_min_seq-helper
+++ a/mm/vmscan.c
@@ -3992,30 +3992,45 @@ done:
 	return true;
 }
 
+/* Similar to lruvec_evictable_size, return the oldest populated seq of the type */
+static unsigned long lruvec_populated_min_seq(struct lruvec *lruvec, int type,
+					      unsigned long max_seq)
+{
+	int gen, zone;
+	unsigned long min_seq;
+	struct lru_gen_folio *lrugen = &lruvec->lrugen;
+
+	lockdep_assert_held(&lruvec->lru_lock);
+
+	min_seq = READ_ONCE(lrugen->min_seq[type]);
+	while (min_seq <= max_seq) {
+		gen = lru_gen_from_seq(min_seq);
+		for (zone = 0; zone < MAX_NR_ZONES; zone++) {
+			if (!list_empty(&lrugen->folios[gen][type][zone]))
+				return min_seq;
+		}
+		min_seq++;
+	}
+
+	return max_seq;
+}
+
 static void try_to_inc_min_seq(struct lruvec *lruvec, int swappiness)
 {
-	int gen, type, zone;
+	int type;
 	bool seq_inc_flag = false;
 	struct lru_gen_folio *lrugen = &lruvec->lrugen;
 	DEFINE_MIN_SEQ(lruvec);
+	unsigned long seq;
 
 	VM_WARN_ON_ONCE(!seq_is_valid(lruvec));
 
-	/* find the oldest populated generation */
+	/* Requires at least MIN_NR_GENS gens for basic functionality */
+	seq = lrugen->max_seq - MIN_NR_GENS;
 	for_each_evictable_type(type, swappiness) {
-		while (min_seq[type] + MIN_NR_GENS <= lrugen->max_seq) {
-			gen = lru_gen_from_seq(min_seq[type]);
-
-			for (zone = 0; zone < MAX_NR_ZONES; zone++) {
-				if (!list_empty(&lrugen->folios[gen][type][zone]))
-					goto next;
-			}
-
-			min_seq[type]++;
+		min_seq[type] = lruvec_populated_min_seq(lruvec, type, seq + 1);
+		if (min_seq[type] > lrugen->min_seq[type])
 			seq_inc_flag = true;
-		}
-next:
-		;
 	}
 
 	/*
_

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

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