From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-185.mta0.migadu.com (out-185.mta0.migadu.com [91.218.175.185]) (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 017BD37C915 for ; Fri, 8 May 2026 09:49:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.185 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778233766; cv=none; b=ETlJnJoPJCvU8AvMStIvRqQ2idazpg9UGQeVL3ptBMmivkGX80PpL/USglSIwst/zmHUEvoWT++CPjB/wEwgGVHlmDHipF99DJ+yWwT0n2xdi8Xvkbft3f9qmx4MY8nI/biekN4XDNrxmupGYUNwo2bfOtvzw9DM7F0c6xW/d4E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778233766; c=relaxed/simple; bh=Gu9snaUFg5pUfKE0Mby48zcGZeI/KAashFElf+cKxMw=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=G9mgkkeYj0kCwSJ1bz6JBj0yoh4jfx0zyd2GNnkK2eSKpKwoJnqdM1BIhoubRCeKX7fU4fcj/s+0y3SGgPYzThDlRBRoGPEQB8JqJ4SPpyLAskfZobfGlgvo7sHAvbKnYTN7NMQUrAaZvIyp7F5Cxhhmwo3QB00tCAJpTxxsY5w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; arc=none smtp.client-ip=91.218.175.185 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Hao Ge To: Andrew Morton , David Hildenbrand Cc: linux-mm@kvack.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, Hao Ge Subject: [PATCH v2] mm/balloon: expose per-node balloon pages in node meminfo Date: Fri, 8 May 2026 17:47:36 +0800 Message-Id: <20260508094736.142467-1-hao.ge@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Commit 835de37603ef ("meminfo: add a per node counter for balloon drivers") added NR_BALLOON_PAGES and exposed it in /proc/meminfo. However, the per-node view at /sys/devices/system/node/nodeX/meminfo was not updated, even though the counter is already tracked per-node. Add it to node_read_meminfo() so users can see balloon usage per NUMA node without having to parse the raw vmstat file. Signed-off-by: Hao Ge --- v2: Move Balloon field after Unaccepted to match /proc/meminfo ordering (suggested by David Hildenbrand) --- drivers/base/node.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/base/node.c b/drivers/base/node.c index d7647d077b66..85c20aa3c7f2 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -523,6 +523,7 @@ static ssize_t node_read_meminfo(struct device *dev, #ifdef CONFIG_UNACCEPTED_MEMORY "Node %d Unaccepted: %8lu kB\n" #endif + "Node %d Balloon: %8lu kB\n" , nid, K(node_page_state(pgdat, NR_FILE_DIRTY)), nid, K(node_page_state(pgdat, NR_WRITEBACK)), @@ -556,6 +557,8 @@ static ssize_t node_read_meminfo(struct device *dev, , nid, K(sum_zone_node_page_state(nid, NR_UNACCEPTED)) #endif + , + nid, K(node_page_state(pgdat, NR_BALLOON_PAGES)) ); len += hugetlb_report_node_meminfo(buf, len, nid); return len; -- 2.25.1