From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C18E3F106D for ; Fri, 9 Oct 2026 05:56:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791525405; cv=none; b=LrFRtfLThAwVOcjVVdPss0FQ8AEwS9hytyQ3q5HQ5+gbHGqY8yaDCKpW2x72bmE0tZa1Vr4qF3dFMnzMIWcUY2M8T37yS3yuzxcLOGXkaYWUftLcLbHReF/xgdOpmJ7ngQPmpDtwyBbMEJdKLYSFixAWnKzYuHSPBfxEwuNF0jw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791525405; c=relaxed/simple; bh=AYiaabVBXGbxUAte3snGAv8X+JI4d4Ym1JNNrapHL0M=; h=Date:To:From:Subject:Message-Id; b=BB90EaLHh9I9CbxSVM8HO+vFKrE3g8SMAh6ftvFjZ0KXMg7wG11jSbrF0JDNLmxhcTVb6At5Cswct6JvxX7qFPfIIRUNso2j8z8f1Jr3RYdXb5MrkVJO4GBGShJrcqBGK6K+8/qlnrxt1koLqE5DL+X19iMNtS37o/PrffEvxN0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=S4pWrDi1; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="S4pWrDi1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C7D451F00893; Fri, 9 Oct 2026 05:56:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1791525403; bh=43kA5tN3rDzuko1mhaiAsn/jrar0WVQq6ZDDAZr/LfQ=; h=Date:To:From:Subject; b=S4pWrDi1sV/iRv6bmTRez6CfXiy9cPqca1UPvZBgznMH70d+v8uraKdoeJBCalJ3K W3uq1G3DhvAJJA56Wv5QG/TvtaD87QMYspviExBMtVzJDxAN5jEs3GjEvhFyO9ZinT cTzq9nzjVQWd4rt30dBxmjn8eVJG3NJp0KG4L75k= Date: Thu, 08 Oct 2026 22:56:43 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,yuzhao@google.com,yuanchu@google.com,weixugc@google.com,vbabka@kernel.org,shakeel.butt@linux.dev,ryncsn@gmail.com,roman.gushchin@linux.dev,ridong.chen@linux.dev,qi.zheng@linux.dev,muchun.song@linux.dev,mhocko@kernel.org,ljs@kernel.org,lianux.mm@gmail.com,liam@infradead.org,hannes@cmpxchg.org,david@kernel.org,chrisl@kernel.org,baoquan.he@linux.dev,baolin.wang@linux.alibaba.com,baohua@kernel.org,axelrasmussen@google.com,kasong@tencent.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-mglru-use-explicit-tier-range-in-read_ctrl_pos.patch removed from -mm tree Message-Id: <20261009055643.C7D451F00893@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/mglru: use explicit tier range in read_ctrl_pos() has been removed from the -mm tree. Its filename was mm-mglru-use-explicit-tier-range-in-read_ctrl_pos.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Kairui Song Subject: mm/mglru: use explicit tier range in read_ctrl_pos() Date: Sun, 06 Sep 2026 00:51:10 +0800 read_ctrl_pos() encodes the tier range in a single "tier" parameter via "tier % MAX_NR_TIERS" as the start and "min(tier, MAX_NR_TIERS-1)" as the end. This is hard to follow, maintain, or extend. Tier values 0..3 select a single tier, while tier == MAX_NR_TIERS selects the full range. Replace it with explicit (tier_min, tier_max) parameters using a closed [tier_min, tier_max] interval, and add LRU_TIER_MIN and LRU_TIER_MAX for the tier bounds. The call sites now become self-documenting: - get_tier_idx: (LRU_TIER_MIN, LRU_TIER_MIN) for the first tier, (tier, tier) for each subsequent tier - get_type_to_scan: (LRU_TIER_MIN, LRU_TIER_MAX) for the full range No functional change. Link: https://lore.kernel.org/20260906-mglru-flags-cleanup-v6-5-9aacbd77d4ca@tencent.com Signed-off-by: Kairui Song Signed-off-by: Andrew Morton Reviewed-by: Baolin Wang Reviewed-by: Baoquan He Reviewed-by: Barry Song Reviewed-by: Ridong Chen Cc: Axel Rasmussen Cc: Chris Li Cc: David Hildenbrand (Arm) Cc: Johannes Weiner Cc: Kairui Song Cc: Liam R. Howlett Cc: Lian Wang Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Muchun Song Cc: Qi Zheng Cc: Roman Gushchin Cc: Shakeel Butt Cc: Vlastimil Babka Cc: Wei Xu Cc: Yuanchu Xie Cc: Yu Zhao Cc: Zi Yan --- include/linux/mmzone.h | 2 ++ mm/vmscan.c | 18 ++++++++++-------- 2 files changed, 12 insertions(+), 8 deletions(-) --- a/include/linux/mmzone.h~mm-mglru-use-explicit-tier-range-in-read_ctrl_pos +++ a/include/linux/mmzone.h @@ -495,6 +495,8 @@ enum lruvec_flags { * folio->flags, masked by LRU_REFS_MASK. */ #define MAX_NR_TIERS 4U +#define LRU_TIER_MIN 0U +#define LRU_TIER_MAX (MAX_NR_TIERS - 1) #ifndef __GENERATING_BOUNDS_H --- a/mm/vmscan.c~mm-mglru-use-explicit-tier-range-in-read_ctrl_pos +++ a/mm/vmscan.c @@ -3223,8 +3223,8 @@ struct ctrl_pos { int gain; }; -static void read_ctrl_pos(struct lruvec *lruvec, int type, int tier, int gain, - struct ctrl_pos *pos) +static void read_ctrl_pos(struct lruvec *lruvec, int type, int tier_min, + int tier_max, int gain, struct ctrl_pos *pos) { int i; struct lru_gen_folio *lrugen = &lruvec->lrugen; @@ -3233,7 +3233,7 @@ static void read_ctrl_pos(struct lruvec pos->gain = gain; pos->refaulted = pos->total = 0; - for (i = tier % MAX_NR_TIERS; i <= min(tier, MAX_NR_TIERS - 1); i++) { + for (i = tier_min; i <= tier_max; i++) { pos->refaulted += lrugen->avg_refaulted[type][i] + atomic_long_read(&lrugen->refaulted[hist][type][i]); pos->total += lrugen->avg_total[type][i] + @@ -4879,9 +4879,9 @@ static int get_tier_idx(struct lruvec *l * This value is chosen because any other tier would have at least twice * as many refaults as the first tier. */ - read_ctrl_pos(lruvec, type, 0, 2, &sp); - for (tier = 1; tier < MAX_NR_TIERS; tier++) { - read_ctrl_pos(lruvec, type, tier, 3, &pv); + read_ctrl_pos(lruvec, type, LRU_TIER_MIN, LRU_TIER_MIN, 2, &sp); + for (tier = LRU_TIER_MIN + 1; tier <= LRU_TIER_MAX; tier++) { + read_ctrl_pos(lruvec, type, tier, tier, 3, &pv); if (!positive_ctrl_err(&sp, &pv)) break; } @@ -4902,8 +4902,10 @@ static int get_type_to_scan(struct lruve * Compare the sum of all tiers of anon with that of file to determine * which type to scan. */ - read_ctrl_pos(lruvec, LRU_GEN_ANON, MAX_NR_TIERS, swappiness, &sp); - read_ctrl_pos(lruvec, LRU_GEN_FILE, MAX_NR_TIERS, MAX_SWAPPINESS - swappiness, &pv); + read_ctrl_pos(lruvec, LRU_GEN_ANON, LRU_TIER_MIN, LRU_TIER_MAX, + swappiness, &sp); + read_ctrl_pos(lruvec, LRU_GEN_FILE, LRU_TIER_MIN, LRU_TIER_MAX, + MAX_SWAPPINESS - swappiness, &pv); return positive_ctrl_err(&sp, &pv); } _ Patches currently in -mm which might be from kasong@tencent.com are