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=1794439639; b=vAEFFNOf8WolMnZjXm3Zfiv+kfO1pfl01AnFCxASKv/KGmF2mrlvS0IQwra73E65B40R ExEnf1BKejaFKXbysMSeT6kpkOBKjXvgpXptq1crUThiQFK1HsvhQhJgR7WQxGfNWIUDP THt/bZRH56pESaJAZNMDzRa1V/yos46tKxeyONNYTMWOBNMZ3VAmb4OYrOdExbmhQLjak hPdbpC/FXHUJQHOA/yf5n3mHml5qyvbcwswA1aYk7nGzMWrD22wVBgRK52gtfAst4nPet GUxGePm4vpD8XOXYATUE/RrVMHkPnJWqn+i/YOHmqR+R9At1mJpXOa9Ytx/0YQotApA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794439639; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-Id:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=Sz+akw3wpRLgZUlPI2FoNb4TEGhdSTFiLZleLq7ib24=; b=NQUUfQjIJZvMgh8HcXGDT3pCk9ImRtcs2janwOOiKc7xyWy5uku7zzCEvfR/eYqKgHtr ES/uLWeLd1Gov59rriYdQBg0jhfDTsQZ/SgswMrIfiX3d/IHLS7q2jv9fiwR3YXrgchB4 jimxENKQMNprnehIqSlakjkxZPlV1Xq92viEGuQDP6YQjYIMuoIQMEK5PdvtFwzrDWY2q 5mua25LdIz5BlBeLZlRUOsM6rjJXx3zyAdFzYEtYuw71y3lei0VO/50YUUFgTmRqaxZvc ++gSkKgvEAYPr4IjE6mymXdqlvTPaiT2qSznfo/RsQHne1UCmf1mv3A1sM3tGBziIOA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=CrJBR+If; 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 26D3560A2625 for ; Wed, 11 Nov 2026 23:27:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=CrJBR+If Received: by smtp.kernel.org (Postfix) with ESMTPSA id 17C6C1F00A09; Wed, 11 Nov 2026 23:27:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794439638; bh=Sz+akw3wpRLgZUlPI2FoNb4TEGhdSTFiLZleLq7ib24=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=CrJBR+IfaqoyJNKdiShU+ukvgr5AzAPtScOFfDV3LMtgKdH/z91frdPGeNlFOl9CU W1tVXZv9mF8cyKGslV4MuftKxocEVdH6+HpLBhqimecDB5SESeUJ/Eu3FqPYVZlOS/ ubrgq+nH9EtIPP5BDkwMvtwWQk9pq2iukmv5Ndd+x2YddhaIJdqNA06uZvkkJHxqtS gBYvdO+kFNGBgujvuacy7FIYZyeExvxaRJgMoTVXxlgf66+3IuA7OqgqMwDPmJ8444 fG3xW3uewZ8dBA4IYizJr/3VBTho09J3y24rUh4q+7hG6KlQXI4WfZKNLjWe6ifJRn 4w2Aez6EAP7lQ== From: "Barry Song (Xiaomi)" To: akpm@linux-foundation.org Cc: axelrasmussen@google.com, baolin.wang@linux.alibaba.com, baoquan.he@linux.dev, hannes@cmpxchg.org, hui.zhu@linux.dev, kasong@tencent.com, kunwu.chan@gmail.com, liam@infradead.org, lianux.mm@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, liuxiang.277@bytedance.com, lyugaofei@xiaomi.com, mhocko@kernel.org, mhocko@suse.com, qi.zheng@linux.dev, ridong.chen@linux.dev, rppt@kernel.org, ryncsn@gmail.com, shakeel.butt@linux.dev, surenb@google.com, wangzicheng@honor.com, weixugc@google.com, yuanchu@google.com, zhangbo56@xiaomi.com, zhuhui@kylinos.cn, sidchintamaneni@gmail.com, "Barry Song (Xiaomi)" Subject: [PATCH v7 13/16] mm/mglru: Reduce LRU lock contention by shrinking folio batches in inc_min_seq Date: Thu, 12 Nov 2026 07:26:00 +0800 Message-Id: <20261111232603.9934-14-baohua@kernel.org> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20261111232603.9934-1-baohua@kernel.org> References: <20261111232603.9934-1-baohua@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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. Signed-off-by: Barry Song (Xiaomi) --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 7a48b82ea4c1..6315edf50376 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3911,7 +3911,7 @@ static inline void flush_lru_batch(struct list_head *head, struct list_head **ba 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]); -- 2.34.1