From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f72.google.com (mail-pj1-f72.google.com [209.85.216.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 934963BB693 for ; Thu, 6 Aug 2026 01:12:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785978727; cv=none; b=KrG7GR2BO7NmFeVMFSdryghD3iX8HefhnjOzv8qNqrSuW7luGmztV1CfMv4jj3HLbCqioIYNGviluc+KfFNwUp2NFCJ2G5Z7lozhoVXY7UMXqeZxhACcz+AgoGVxcDE9/t3AJHA4L5FSNDxmwY8R+c1DFEAIT4VAkm5hrEhLLAY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785978727; c=relaxed/simple; bh=oA6KMU/tTZ7Iaatxo4FA4Ou6R4KKrl+H8HaLX0yIX28=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=BV/ylP5dPyAl+YJBbd+SuvVftXbA8Om73bciOJVBYaLfEg5jOcu2x908+9boeZSe6wnsGcKi5VQmaK0MfNkCiM1sPZNBJaseUWlX8fZZNPSn1Fmudu7c0I+KcivWv28BWIlTAj35PFEKxy+YIeYT5n1SviXDKLRl7h9vT8s8IFg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jyescas.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=ricwGQMQ; arc=none smtp.client-ip=209.85.216.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jyescas.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ricwGQMQ" Received: by mail-pj1-f72.google.com with SMTP id 98e67ed59e1d1-38ec0f510a9so3547381a91.2 for ; Wed, 05 Aug 2026 18:12:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1785978726; x=1786583526; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=8g9EMe09F+Ayx5LYmfEKiyWcm3g2pLNQKJ+H2xPNgqI=; b=ricwGQMQ1u4fEvgeNsYHw4GDsjyEiUdDyv/VbeccH9SwlCtbut1wzdm2MqgX8c44QM EdKcPxbykJSHI+TWIWMIZMDNgQtdR1Hc8uMkwoPlHNUndjXOlSHIzmOt+oiUCGhA1KmG PmCu4OUxavCUGtRTtBn17Jwn6AiIWs70fDahyW7Uvhg9xjSHDRzOet3C2avBgHtlOzzv 7YMvSQfnJgj56/c4BBRLScZdi3+HZ2lChZCkZk6bvqMc6xLWhP9IlLlEmUf96iRD3IiI qnUVuMjrpmSEgm4nRhboBjwXGJPVaORRNiHq5NmfENC+XZDpdJxTNWJPzcbd/z3j8sTD wIDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785978726; x=1786583526; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=8g9EMe09F+Ayx5LYmfEKiyWcm3g2pLNQKJ+H2xPNgqI=; b=KdLjwomdF41fMX6H/q8qL41HInzD7BdscMcqusU9vOJihmiamuSy4ex8QpXQ5Oim4L 9jn2qHfzAeGNbdIK/RGELR6WbBWTpKaIcvpWkB3w1Vlf0HMHXASKD34m5J0kUowHfIXp leEOLc94GuRChWChMCC8jZlb+u0CKeWdSlbIjWbYxJBvib18CvBKGxqBrnpPJFmDblmJ ZEsNrZSHPi8jEN70AykwuIgZoLnx/Gysdf3IscFue551UC62NBTK2y3xFUdD8t+UzLNp RIG7tNuB20ia7yAb4DYYWXvGDkXmZL0kDiDUfNU6fZdiaT5M2G4VkeqFpFzlZIp7FarF ygxg== X-Forwarded-Encrypted: i=1; AHgh+Rqvf0olcRFeLEi+Qruoj2XlswHRqr88mtPzJr9L/7YLqaHaZSstOi6Twl2s/zSZ0JpeIXi2Yp4VuSA9NGc=@vger.kernel.org X-Gm-Message-State: AOJu0Yy+Ez8Gb2Or6KIuGCzzkE8pF2BJzvIcvUNggt3AyPCszRmW2bws Atu5wOLI5PMDW1vdXLF0LAVIFYQN76/cf419oQ5KvL4nGl+Jvtp4EI04MdTTKvxwuYWTDzYoklc yqu7SEkkzLA== X-Received: from dlah18.prod.google.com ([2002:a05:701b:2612:b0:13f:a0ee:666f]) (user=jyescas job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90a:c88e:b0:38e:488f:7068 with SMTP id 98e67ed59e1d1-3903c5373b4mr12668555a91.2.1785978725605; Wed, 05 Aug 2026 18:12:05 -0700 (PDT) Date: Wed, 5 Aug 2026 18:09:06 -0700 In-Reply-To: <20260806011048.517229-1-jyescas@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260806011048.517229-1-jyescas@google.com> X-Mailer: git-send-email 2.55.0.629.g250fe7f194-goog Message-ID: <20260806011048.517229-6-jyescas@google.com> Subject: [RFC PATCH v2 05/16] mm: Define function to create a dir for populated zone From: Juan Yescas To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , open list , "open list:MEMORY MANAGEMENT - CORE" Cc: jyescas@google.com, android-mm@google.com, ljs@kernel.org, fvdl@google.com, tkjos@google.com, minchan@google.com, dskiba@google.com, open list , "open list:MEMORY MANAGEMENT - CORE" Content-Type: text/plain; charset="UTF-8" This change creates a directory for each populated zone in the node. Note: ZONE_DEVICE pages won't be exposed in this driver due they are not managed by the Buddy Allocator. Signed-off-by: Juan Yescas --- Changes in v2: - Update comments. - Remove unused variables. mm/page_alloc_hogger.c | 46 ++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 44 insertions(+), 2 deletions(-) diff --git a/mm/page_alloc_hogger.c b/mm/page_alloc_hogger.c index 5765ecc43567..e8944080e82e 100644 --- a/mm/page_alloc_hogger.c +++ b/mm/page_alloc_hogger.c @@ -88,6 +88,7 @@ #include #include #include +#include #include #include #include @@ -126,21 +127,62 @@ struct page_alloc { static struct kmem_cache *req_alloc_cache; static struct kmem_cache *page_alloc_cache; + +/** + * create_zones_subdirs() - Creates a directory for each populated zone in the + * node. + * + * Note: ZONE_DEVICE pages won't be allocated using this driver. The main reason + * is because they are not managed by the Buddy Allocator or CMA allocator. + */ +static inline int create_zones_subdirs(struct dentry *nodedir, + struct pglist_data *pgdata) +{ + struct dentry *zonedir; + struct zone *zone; + struct zone *node_zones = pgdata->node_zones; + char dirname[24]; + + for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { + if (!populated_zone(zone)) + continue; + + /* ZONE_DEVICE pages won't be allocated using this driver. */ + if (zone_is_zone_device(zone)) + continue; + + snprintf(dirname, sizeof(dirname), "zone-%s", zone->name); + zonedir = debugfs_create_dir(dirname, nodedir); + if (IS_ERR(zonedir)) + return PTR_ERR(zonedir); + } + + return 0; +} + /** * create_nodes_subdirs() - Creates a directory for each node that contains - * memory. + * memory. Once that the node directory is created, it creates a directory for + * each zone in the node. */ static inline int create_nodes_subdirs(struct dentry *mmdir) { struct dentry *nodedir; - int nid; char dirname[12]; + int nid; + int ret; for_each_node_state(nid, N_MEMORY) { + struct pglist_data *pgdata = NODE_DATA(nid); + snprintf(dirname, sizeof(dirname), "node-%d", nid); nodedir = debugfs_create_dir(dirname, mmdir); if (IS_ERR(nodedir)) return PTR_ERR(nodedir); + + ret = create_zones_subdirs(nodedir, pgdata); + if (ret) + return ret; } return 0; -- 2.55.0.629.g250fe7f194-goog