From patchwork Fri Jul 28 18:20:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ajay Kaher X-Patchwork-Id: 707770 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3AEF4C0015E for ; Fri, 28 Jul 2023 18:21:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235967AbjG1SVY (ORCPT ); Fri, 28 Jul 2023 14:21:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60946 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235923AbjG1SVW (ORCPT ); Fri, 28 Jul 2023 14:21:22 -0400 Received: from CY4PR02CU008.outbound.protection.outlook.com (mail-westcentralusazon11012009.outbound.protection.outlook.com [40.93.200.9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9B728422A; Fri, 28 Jul 2023 11:21:21 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=AbHXSB6lK+GYztEgq1esT45tQ+bSTT+z4FBsKiNEIN8vN+DhptNlA1AbSN0qlJw/Mmdb+HdHC6yp5Wy95eIakQwmVI48gWQSUAgBYtuBxoMckcACyk5fmgnSGvXpN7bTrqXcyo4hnUFv95xgyF4Hj7lsy2mV5RGKagX72FvNk4twihzSgUmH7xh4PZZVOHFdyujU0m3pKPDUBh9JI08s0kzbQRKAGjxWyke7CDlpCgVro2JZGfnZl6M75jcfe9OnhCOoTRGB8Vll3U0xqrkbtrfInS1oed+Cfmolt/39FDIZaLTx2O1vjiuhjIjm1Ntw5mnS27B3Z7JHDSrYWWVDmQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=h9dr8VcqHnHafKIs/SE0VyRBuRoqJbRFE8lhfXDwGdY=; b=Kj9GTXmM1o/Rs1Wr7xYcDP+UW0KHfR2yh2u+P87TysT8l1uJ9pM1rVPuu9gqVSF744RVUQ/AUDpfrN954nweaYZSbaG+fOimbUYRzZowtVyKRYLk5xj5GsjRq7LcJ7PeAHL5AR1oPJRA+EyNcABW20E5MbUleayV65eumt1I3r9x3u8CVgzEM3udran7Cog1OrGfE55z7Q68XrgmlhM3fQbc2mLRvInU/1bN2GeaySLW0AQIFKAuk+eyOnvlTtrB+gH9SbCkJO4B8Yqcb36rBJR2AvEc6a4DYOlNrMd6lQlKM84qoBMUtr8mXy95z1FEsUxEY+xigzkudN+s8roBSg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=vmware.com; dmarc=pass action=none header.from=vmware.com; dkim=pass header.d=vmware.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vmware.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=h9dr8VcqHnHafKIs/SE0VyRBuRoqJbRFE8lhfXDwGdY=; b=g/xUxHe1wz1UZCEchaoEwf4bzJvDxOQZv0jVH0wWj8QLmB3AhfRc9zrt/f9cLrclFD47LLSWpJ6sWmQmcF94C/1yXCCZpoLbSYrJ02YExP0XHGoL3K5ZhwBu45Un2BTTJDIX50AqWhMc5VvRPTowe8eYZu1A9wSx2oxPYcpiNwg= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=vmware.com; Received: from PH0PR05MB8703.namprd05.prod.outlook.com (2603:10b6:510:bd::5) by SN7PR05MB9264.namprd05.prod.outlook.com (2603:10b6:806:26c::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6631.29; Fri, 28 Jul 2023 18:21:19 +0000 Received: from PH0PR05MB8703.namprd05.prod.outlook.com ([fe80::b5d8:98b9:6ca7:94f0]) by PH0PR05MB8703.namprd05.prod.outlook.com ([fe80::b5d8:98b9:6ca7:94f0%6]) with mapi id 15.20.6631.026; Fri, 28 Jul 2023 18:21:19 +0000 From: Ajay Kaher To: rostedt@goodmis.org, shuah@kernel.org, mhiramat@kernel.org Cc: chinglinyu@google.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-trace-kernel@vger.kernel.org, lkp@intel.com, namit@vmware.com, oe-lkp@lists.linux.dev, akaher@vmware.com, amakhalov@vmware.com, er.ajay.kaher@gmail.com, srivatsa@csail.mit.edu, tkundu@vmware.com, vsirnapalli@vmware.com Subject: [PATCH v6 02/10] eventfs: Implement tracefs_inode_cache Date: Fri, 28 Jul 2023 23:50:44 +0530 Message-Id: <1690568452-46553-3-git-send-email-akaher@vmware.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1690568452-46553-1-git-send-email-akaher@vmware.com> References: <1690568452-46553-1-git-send-email-akaher@vmware.com> X-ClientProxiedBy: BYAPR11CA0090.namprd11.prod.outlook.com (2603:10b6:a03:f4::31) To PH0PR05MB8703.namprd05.prod.outlook.com (2603:10b6:510:bd::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH0PR05MB8703:EE_|SN7PR05MB9264:EE_ X-MS-Office365-Filtering-Correlation-Id: ad2bbd36-b5c7-4bb0-64e5-08db8f977027 X-LD-Processed: b39138ca-3cee-4b4a-a4d6-cd83d9dd62f0,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:PH0PR05MB8703.namprd05.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230028)(4636009)(39860400002)(376002)(396003)(346002)(136003)(366004)(451199021)(2906002)(316002)(7416002)(8676002)(86362001)(8936002)(41300700001)(36756003)(6512007)(5660300002)(107886003)(26005)(6506007)(6666004)(6486002)(52116002)(83380400001)(478600001)(38350700002)(186003)(38100700002)(4326008)(66556008)(66946007)(66476007)(2616005); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: vmware.com X-MS-Exchange-CrossTenant-Network-Message-Id: ad2bbd36-b5c7-4bb0-64e5-08db8f977027 X-MS-Exchange-CrossTenant-AuthSource: PH0PR05MB8703.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Jul 2023 18:21:18.9072 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: b39138ca-3cee-4b4a-a4d6-cd83d9dd62f0 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ckH8W+j2TocyhhE8cWr03ICvNYJh5h9KNKjUquNF2vjOk+oIv65/6kmik5lOL+G66uAVz6I3ea8wY5htajpnzg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR05MB9264 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Create a kmem cache of tracefs_inodes. To be more efficient, as there are lots of tracefs inodes, create its own cache. This also allows to see how many tracefs inodes have been created. Add helper functions: tracefs_alloc_inode() tracefs_free_inode() get_tracefs() Signed-off-by: Ajay Kaher Co-developed-by: Steven Rostedt (VMware) Signed-off-by: Steven Rostedt (VMware) Tested-by: Ching-lin Yu --- fs/tracefs/inode.c | 39 +++++++++++++++++++++++++++++++++++++++ fs/tracefs/internal.h | 15 +++++++++++++++ 2 files changed, 54 insertions(+) create mode 100644 fs/tracefs/internal.h diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c index 57ac8aa4a724..2508944cc4d8 100644 --- a/fs/tracefs/inode.c +++ b/fs/tracefs/inode.c @@ -21,13 +21,33 @@ #include #include #include +#include "internal.h" #define TRACEFS_DEFAULT_MODE 0700 +static struct kmem_cache *tracefs_inode_cachep __ro_after_init; static struct vfsmount *tracefs_mount; static int tracefs_mount_count; static bool tracefs_registered; +static struct inode *tracefs_alloc_inode(struct super_block *sb) +{ + struct tracefs_inode *ti; + + ti = kmem_cache_alloc(tracefs_inode_cachep, GFP_KERNEL); + if (!ti) + return NULL; + + ti->flags = 0; + + return &ti->vfs_inode; +} + +static void tracefs_free_inode(struct inode *inode) +{ + kmem_cache_free(tracefs_inode_cachep, get_tracefs(inode)); +} + static ssize_t default_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos) { @@ -346,6 +366,9 @@ static int tracefs_show_options(struct seq_file *m, struct dentry *root) } static const struct super_operations tracefs_super_operations = { + .alloc_inode = tracefs_alloc_inode, + .free_inode = tracefs_free_inode, + .drop_inode = generic_delete_inode, .statfs = simple_statfs, .remount_fs = tracefs_remount, .show_options = tracefs_show_options, @@ -628,10 +651,26 @@ bool tracefs_initialized(void) return tracefs_registered; } +static void init_once(void *foo) +{ + struct tracefs_inode *ti = (struct tracefs_inode *) foo; + + inode_init_once(&ti->vfs_inode); +} + static int __init tracefs_init(void) { int retval; + tracefs_inode_cachep = kmem_cache_create("tracefs_inode_cache", + sizeof(struct tracefs_inode), + 0, (SLAB_RECLAIM_ACCOUNT| + SLAB_MEM_SPREAD| + SLAB_ACCOUNT), + init_once); + if (!tracefs_inode_cachep) + return -ENOMEM; + retval = sysfs_create_mount_point(kernel_kobj, "tracing"); if (retval) return -EINVAL; diff --git a/fs/tracefs/internal.h b/fs/tracefs/internal.h new file mode 100644 index 000000000000..954ea005632b --- /dev/null +++ b/fs/tracefs/internal.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _TRACEFS_INTERNAL_H +#define _TRACEFS_INTERNAL_H + +struct tracefs_inode { + unsigned long flags; + void *private; + struct inode vfs_inode; +}; + +static inline struct tracefs_inode *get_tracefs(const struct inode *inode) +{ + return container_of(inode, struct tracefs_inode, vfs_inode); +} +#endif /* _TRACEFS_INTERNAL_H */