From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794694234; b=RHI2wmvhIAVaxOVUSnYA+UYYi79jTQ4JytvKl8R6qn6aoWHb7s24ePBFaW2V94hFYMAn 85WN4Fbgo32xB5lIp5pZkbGVhQi0sTBDog3BPIJwW3DX2lmUyyzmDVfmbGwBSYp/x1T4u xd0QDFVHLANWVJVPIXiXHx4baDq2Bch3i4romorPIYhxVoaLqIY9hSYvTlskwRmATQDWs SyNSkvcgfR3g3/sT18cU9MelyQFXSNKK6ZRlF0JOK10Nn+70F7QDVoZDOGA/4gfv+2Qmm 7UgUtOA3qILrmKA6un2I7JxHOTb7/CJJFsSLB2rYzkZL/BFQPagZ67b97SExqb6K9Fg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794694234; h=Received:DKIM-Signature:Date:To:From:Subject:Message-Id; bh=7cS1yav6M0VE54x8r24JeerCsDqtj2Eo53GxdZKGKBQ=; b=rmbsf4PKIAht317mOhe4F+zSwcG7v3pqlH0k7qHoMIRPLkYnGeDgcioGNjefACFI869E H7fQDfe2rLorHgPHr1ez1C7v5Pytp0vu9YkMe6i60UgGdoqOCaV5NNElEsZc3ZDdyHtiL nMh7KraP4yDbjepYHjLltN7vfIpcrG5ASDeHHLBUfJTAf/6R2+2VM8dsEHJHdHKSLkWoG 4aX8tbQhXOsfQTZjjT8xSTZD8U16Sn8q43JSzJoNRCl411k9Tpd9BB5C58i8U4BsglfQB LrFng2AvsmqTC+Av+cqbQc5nnRkMg6uK3F19Cq++Jdo4dH1AcXaZ7/dYpFv3SY+Nlrw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=xAwIpJWS; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9B83E606A338 for ; Sat, 14 Nov 2026 22:10:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=xAwIpJWS Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3FC2E1F000C6; Sat, 14 Nov 2026 22:10:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1794694234; bh=7cS1yav6M0VE54x8r24JeerCsDqtj2Eo53GxdZKGKBQ=; h=Date:To:From:Subject; b=xAwIpJWS6mzYT4QPWkAXXBzGcGjBhoLlZu9Vk7ziuu8R0+npSZVgjgoisUC8C4kEl zZBygOoab+t+JQxXM2OjccKJHf9sT/SsyMPJ8scP5NolAhLXtk8KnDRsaW9WElRlM5 oUCh9Ende+QBTuEdBHAXZ/cS615kpD4DRn4FdHVI= Date: Sat, 14 Nov 2026 14:10:33 -0800 To: mm-commits@vger.kernel.org,kasong@tencent.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-mglru-extract-lruvec_populated_min_seq-helper.patch added to mm-new branch Message-Id: <20261114221034.3FC2E1F000C6@smtp.kernel.org> X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list The patch titled Subject: mm/mglru: extract lruvec_populated_min_seq() helper has been added to the -mm mm-new branch. Its filename is mm-mglru-extract-lruvec_populated_min_seq-helper.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mglru-extract-lruvec_populated_min_seq-helper.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 Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Kairui Song Subject: mm/mglru: extract lruvec_populated_min_seq() helper Date: Sun, 15 Nov 2026 04:07:49 +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/20261114200803.23129-3-baohua@kernel.org Signed-off-by: Kairui Song Signed-off-by: Barry Song (Xiaomi) Signed-off-by: Andrew Morton Reviewed-by: Kunwu Chan Cc: Axel Rasmussen Cc: Baolin Wang Cc: Baoquan He Cc: Johannes Weiner Cc: Cc: Liam R. Howlett Cc: wang lian Cc: Cc: Cc: Michal Hocko Cc: Qi Zheng Cc: Ridong Chen Cc: Mike Rapoport Cc: Kairui Song Cc: Shakeel Butt Cc: Suren Baghdasaryan Cc: wangzicheng Cc: Wei Xu Cc: Yuanchu Xie Cc: Bo Zhang Cc: Hui Zhu Cc: Siddharth Chintamaneni Cc: Kunwu Chan Cc: Bo Zhang mm/vmscan.c | 45 +++++++++++++++++++++++++++++---------------- 1 file changed, 29 insertions(+), 16 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: - ; } /* @@ -4027,8 +4042,6 @@ next: /* see the comment on lru_gen_folio */ if (swappiness && swappiness <= MAX_SWAPPINESS) { - unsigned long seq = lrugen->max_seq - MIN_NR_GENS; - if (min_seq[LRU_GEN_ANON] > seq && min_seq[LRU_GEN_FILE] < seq) min_seq[LRU_GEN_ANON] = seq; else if (min_seq[LRU_GEN_FILE] > seq && min_seq[LRU_GEN_ANON] < seq) _ 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