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=1794600354; b=zsaBjVSgiklseYDgJttwBI0OODPHQyg/4YUKXHw4VYmoyXlVrkA5koQYHHk+4dFvfiWx cRYoXxDTMi2POwqXEokUqW6FP0PRwMfGhmkotA+CKo0uFQQRagobGhTt/dcZRTbmpmFZD 8cSehKAR3ONiVfGqHmEAn+UNctkRGU/CpJil47OCpe6DQdNnz1Vrbry7QIa4VCvPJX+vx MuD9cGIk0QpJmXOOZfbqMKPakmninOkE/b85E02TWqwRfG3ROYbFotQggwC0AcNfZ5fBI CPUHV9SrQM4S6ZQQw0zblxoxTftVx3ufuiTJEwiGcJA6M/ENfxCNCEli9YFhJ5s4cjg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794600354; h=Received:DKIM-Signature:Date:To:From:Subject:Message-Id; bh=s5hbjcPIzfCKxcPQZJsm1jHZm8K1OW+95XGD9NeFi/o=; b=uX8Hw2wg/LX3+v6iFEdsrjzesY20G/GtDVdt7P4IhDFnYWRQE135n7Poadx+ejpnJcxY hMbyRzqza5bGmR5cOvtd+B2cSn4ekppfat8WItnYZL3JuUyNVdB4Ykall9nbKJSj0rc4C 4JgRjGttoDSi/ILYHEuuvlbrX1gTY5IoynR+TS2318JAgph0p7/wqOz+UZCCtYRgnGYHs QV6AACrCWa+g0fO4+SfgjMA4Lk6oSsyFOa+kwcm43LZrppdQk/EqGZQO8lh4gqlVqA8+9 maDnzkAyf0a2gCdjfXLGrN0N6fr6DKyxvcCP2w2PBY9OWREk9S/LmDG8LdED/kIvNKA== 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=uO2oRJJq; 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 E0745606A331 for ; Fri, 13 Nov 2026 20:05:53 +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=uO2oRJJq Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9726F1F000C4; Fri, 13 Nov 2026 20:05:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1794600353; bh=s5hbjcPIzfCKxcPQZJsm1jHZm8K1OW+95XGD9NeFi/o=; h=Date:To:From:Subject; b=uO2oRJJqZ7p7szewF2x8mtm6d7HHuLeIPqS++F6KbtIBg77tqNMPv8vecBsLECgNz +LxIkAa5E7ecOBs/kHoPn8prx79cxed8VH/TEXUtNJ1wS0dCzDkm1exnSMh08AQRad xPSXiJ+GOnMXYBdzNTCHhuJr2fOvlTLHspBmBW6g= Date: Fri, 13 Nov 2026 12:05:53 -0800 To: mm-commits@vger.kernel.org,baohua@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-mglru-reduce-lru-lock-contention-by-shrinking-folio-batches-in-inc_min_seq.patch added to mm-new branch Message-Id: <20261113200553.9726F1F000C4@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: reduce LRU lock contention by shrinking folio batches in inc_min_seq has been added to the -mm mm-new branch. Its filename is mm-mglru-reduce-lru-lock-contention-by-shrinking-folio-batches-in-inc_min_seq.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mglru-reduce-lru-lock-contention-by-shrinking-folio-batches-in-inc_min_seq.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: "Barry Song (Xiaomi)" Subject: mm/mglru: reduce LRU lock contention by shrinking folio batches in inc_min_seq Date: Sat, 14 Nov 2026 02:55:38 +0800 Reduce the number of folios moved from the oldest generation to the second-oldest generation in each batch. This shortens the time the lruvec lock is held, allowing concurrent LRU operations to make progress and significantly reducing LRU lock contention. Link: https://lore.kernel.org/20261113185541.70203-14-baohua@kernel.org Signed-off-by: Barry Song (Xiaomi) Signed-off-by: Andrew Morton Cc: Axel Rasmussen Cc: Baolin Wang Cc: Baoquan He Cc: Johannes Weiner Cc: Cc: Kairui Song Cc: Kunwu Chan Cc: Liam R. Howlett Cc: wang lian Cc: Cc: Cc: Michal Hocko Cc: Qi Zheng Cc: Ridong Chen Cc: Mike Rapoport Cc: Shakeel Butt Cc: Suren Baghdasaryan Cc: wangzicheng Cc: Wei Xu Cc: Yuanchu Xie Cc: Bo Zhang Cc: Hui Zhu Cc: Siddharth Chintamaneni Cc: Bo Zhang --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/vmscan.c~mm-mglru-reduce-lru-lock-contention-by-shrinking-folio-batches-in-inc_min_seq +++ a/mm/vmscan.c @@ -3912,7 +3912,7 @@ static inline void flush_lru_batch(struc static bool inc_min_seq(struct lruvec *lruvec, int type, int swappiness) { int zone; - int remaining = MAX_LRU_BATCH; + int remaining = MIN_LRU_BATCH; struct lru_gen_folio *lrugen = &lruvec->lrugen; int hist = lru_hist_from_seq(lrugen->min_seq[type]); int new_gen, old_gen = lru_gen_from_seq(lrugen->min_seq[type]); _ Patches currently in -mm which might be from baohua@kernel.org are arm64-vmalloc-allow-arch_vmap_pte_range_map_size-to-batch-multiple-cont_pte.patch mm-vmalloc-extend-page-table-walk-to-support-larger-page_shift-sizes-and-eliminate-page-table-rewalk.patch mm-vmalloc-map-contiguous-pages-in-batches-for-vmap-if-possible.patch mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch mm-mglru-avoid-placing-rejected-folios-below-populated-gen.patch mm-mglru-run-aging-when-one-type-has-no-populatable-folios.patch mm-mglru-restrict-eviction-accounting-to-eligible-zones.patch mm-mglru-reduce-lru-lock-contention-by-shrinking-folio-batches-in-inc_min_seq.patch mm-mglru-make-swappiness=1-file-reclaim-more-aggressive.patch