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=1794694262; b=VgnmWVOZE2VYLVUyg/zRzf/A00BKC7sR/RgkC2JhbbQglTy4tb0F3X7i89rf1MCHHq8h wV3l4AVLPE97tkia0EnKfgja/DOxsSeMyWIMhQmVXDrwRgpLauSNScN7NUMLxTPuIMDbg NmI55XhW2VkPAsj/TQgi9E4w/OhCDF7ElDCk3CatWhLs0/kIn6z5+x3h5VBV6+Kv4DIU/ HKwA+L0A/IngsxXXgiQHwW8RpRMC1mid4imw/zqAj3RCic3FG4Iiedrn19FNqiZPIRr7b oA0AezTJizF9BEPX0osRD6iJXw4ANoWRrkZQ+golni3fpJWeiAbTKxYnXljh3IlTEfA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794694262; h=Received:DKIM-Signature:Date:To:From:Subject:Message-Id; bh=6+8+kRcZXWqZcCOPMqyQRSpT9FY+drQ1MvcJU+1rjBE=; b=yFRvGJygno/jiEX0O4Tp6OnnyW4gdMXvvfICjBfa2Ro0MDj7m9AZmugZZx0iAsjIyjVw 6TWIsEyKZracnNp0a0bg+nbRBTmNNht2Hsjl2B7XLBH04tt0mORwfTQF9ZPlLx0kOVygN i5LAAVqbJWqzH3gPbS4DjQr5Jtf1ZIBHakgtyJz88vvXIvHwzEANcNeYFpAITJ0xCZEp7 y/GC7skUarbkUC+t4WKYXy8YIlZdkVnxwtWoLG1uWogJuWuCERwuonL+6OPbH1pboVR0S 9nv7pUK0pQcg2eSJ/TN2TcKzYtUdYnij1RMSG90mR7I30HtnmJUS2kp7mLvd8qt4xqw== 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=cIruqY8t; 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 A2937606A323 for ; Sat, 14 Nov 2026 22:11:02 +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=cIruqY8t Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6BDEC1F000C4; Sat, 14 Nov 2026 22:11:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1794694262; bh=6+8+kRcZXWqZcCOPMqyQRSpT9FY+drQ1MvcJU+1rjBE=; h=Date:To:From:Subject; b=cIruqY8tjXzFtjwH/ttqYJ070hXSohhJANP9gm4v84EIMwuBCxG8vPuYe3m5sCMW6 cvDy/FC33yeE0vcGh6IMxZ9gsA07dIWCi19aBFmMQKVa35nRdXTjGZ7Z7Vro7sILr2 sNLEl3ruERmWerDXMKqEdX5Jc3Eq8GD0qryBW2SM= Date: Sat, 14 Nov 2026 14:11:02 -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: <20261114221102.6BDEC1F000C4@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: Sun, 15 Nov 2026 04:08:00 +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/20261114200803.23129-14-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 @@ -3914,7 +3914,7 @@ 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-is-drained.patch mm-mglru-run-aging-when-one-type-is-drained-fix.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