[to-be-updated] mm-mglru-avoid-prolonged-anon-reclaim-with-swappiness=200.patch removed from -mm tree

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

The quilt patch titled
     Subject: mm/mglru: avoid prolonged anon reclaim with swappiness=200
has been removed from the -mm tree.  Its filename was
     mm-mglru-avoid-prolonged-anon-reclaim-with-swappiness=200.patch

This patch was dropped because an updated version will be issued

------------------------------------------------------
From: Gaofei Lyu <lyugaofei@xiaomi.com>
Subject: mm/mglru: avoid prolonged anon reclaim with swappiness=200
Date: Sat, 14 Nov 2026 02:55:39 +0800

It has been observed that swappiness=200 can significantly slow down
reclaim on some machines, with some workloads running 3x slower under
MGLRU than under CLRU.

This is because swappiness=200 currently results in file_factor=0.  Give
file reclaim a small factor at lower priorities, for example, when
sc->priority < DEF_PRIORITY / 2.

Link: https://lore.kernel.org/20261113185541.70203-15-baohua@kernel.org
Signed-off-by: Gaofei Lyu <lyugaofei@xiaomi.com>
Signed-off-by: Barry Song (Xiaomi) <baohua@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Co-developed-by: Barry Song (Xiaomi) <baohua@kernel.org>
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: Kairui Song <kasong@tencent.com>
Cc: Kunwu Chan <kunwu.chan@gmail.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: wang lian <lianux.mm@gmail.com>
Cc: <liuxiang.277@bytedance.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: 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: Bo Zhang <zhangbo0325@gmail.com>
---

 mm/vmscan.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

--- a/mm/vmscan.c~mm-mglru-avoid-prolonged-anon-reclaim-with-swappiness=200
+++ a/mm/vmscan.c
@@ -4899,8 +4899,8 @@ static int get_tier_idx(struct lruvec *l
  * We don't calculate the scan cost, MGLRU uses lazy promotion, which will
  * cancel the scan budget natually.
  */
-static void lru_gen_balance_scan(struct lruvec *lruvec, int swappiness,
-		unsigned long total_scan, unsigned long nr[])
+static void lru_gen_balance_scan(struct lruvec *lruvec, struct scan_control *sc,
+		int swappiness, unsigned long total_scan, unsigned long nr[])
 {
 	struct lru_gen_folio *lrugen = &lruvec->lrugen;
 	u64 refault_rate[ANON_AND_FILE], anon_factor, file_factor;
@@ -4957,7 +4957,12 @@ static void lru_gen_balance_scan(struct
 	file_weight = nr[LRU_GEN_FILE] + nr[LRU_GEN_ANON] / size_bias;
 
 	anon_factor = (u64)swappiness * refault_rate[LRU_GEN_FILE] * anon_weight;
-	file_factor = (u64)(MAX_SWAPPINESS - swappiness) * refault_rate[LRU_GEN_ANON] * file_weight;
+	if (swappiness == MAX_SWAPPINESS)
+		file_factor = sc->priority < DEF_PRIORITY / 2 ?
+			      refault_rate[LRU_GEN_ANON] * file_weight : 0;
+	else
+		file_factor = (u64)(MAX_SWAPPINESS - swappiness) *
+			      refault_rate[LRU_GEN_ANON] * file_weight;
 
 	/* Cross-multiply the ratio above. */
 	anon_scan = mul_u64_u64_div_u64(total_scan, anon_factor, anon_factor + file_factor);
@@ -5154,7 +5159,7 @@ static void lru_gen_prepare_scan(struct
 
 	total = apply_proportional_protection(memcg, sc, total);
 	total >>= sc->priority;
-	lru_gen_balance_scan(lruvec, swappiness, total, nr_to_scan);
+	lru_gen_balance_scan(lruvec, sc, swappiness, total, nr_to_scan);
 }
 
 static bool should_abort_scan(struct lruvec *lruvec, struct scan_control *sc)
@@ -5914,7 +5919,7 @@ static int run_eviction(struct lruvec *l
 			return 0;
 
 		lruvec_evictable_size(lruvec, sc, swappiness, nr_to_scan);
-		lru_gen_balance_scan(lruvec, swappiness,
+		lru_gen_balance_scan(lruvec, sc, swappiness,
 				     nr_to_reclaim - sc->nr_reclaimed, nr_to_scan);
 
 		if (!evict_folio_lists(nr_to_scan, lruvec, sc, swappiness, MAX_LRU_BATCH))
_

Patches currently in -mm which might be from lyugaofei@xiaomi.com are