From nobody Sun Feb 8 16:32:12 2026 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 907E4C04A94 for ; Mon, 31 Jul 2023 23:17:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231899AbjGaXRq (ORCPT ); Mon, 31 Jul 2023 19:17:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40412 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231898AbjGaXRe (ORCPT ); Mon, 31 Jul 2023 19:17:34 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B3E11170D for ; Mon, 31 Jul 2023 16:17:16 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 02A096134F for ; Mon, 31 Jul 2023 23:17:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74D2BC433CC; Mon, 31 Jul 2023 23:17:07 +0000 (UTC) Received: from rostedt by gandalf with local (Exim 4.96) (envelope-from ) id 1qQc8Q-003fNd-1X; Mon, 31 Jul 2023 19:17:06 -0400 Message-ID: <20230731231706.293833513@goodmis.org> User-Agent: quilt/0.66 Date: Mon, 31 Jul 2023 19:16:41 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Andrew Morton , Ajay Kaher , Ching-lin Yu Subject: [for-next][PATCH 07/15] eventfs: Implement tracefs_inode_cache References: <20230731231634.031452225@goodmis.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ajay Kaher 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() Link: https://lkml.kernel.org/r/1690568452-46553-3-git-send-email-akaher@vm= ware.com Signed-off-by: Ajay Kaher Co-developed-by: Steven Rostedt (VMware) Signed-off-by: Steven Rostedt (VMware) Tested-by: Ching-lin Yu Signed-off-by: Steven Rostedt (Google) --- 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" =20 #define TRACEFS_DEFAULT_MODE 0700 +static struct kmem_cache *tracefs_inode_cachep __ro_after_init; =20 static struct vfsmount *tracefs_mount; static int tracefs_mount_count; static bool tracefs_registered; =20 +static struct inode *tracefs_alloc_inode(struct super_block *sb) +{ + struct tracefs_inode *ti; + + ti =3D kmem_cache_alloc(tracefs_inode_cachep, GFP_KERNEL); + if (!ti) + return NULL; + + ti->flags =3D 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, str= uct dentry *root) } =20 static const struct super_operations tracefs_super_operations =3D { + .alloc_inode =3D tracefs_alloc_inode, + .free_inode =3D tracefs_free_inode, + .drop_inode =3D generic_delete_inode, .statfs =3D simple_statfs, .remount_fs =3D tracefs_remount, .show_options =3D tracefs_show_options, @@ -628,10 +651,26 @@ bool tracefs_initialized(void) return tracefs_registered; } =20 +static void init_once(void *foo) +{ + struct tracefs_inode *ti =3D (struct tracefs_inode *) foo; + + inode_init_once(&ti->vfs_inode); +} + static int __init tracefs_init(void) { int retval; =20 + tracefs_inode_cachep =3D 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 =3D 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 */ --=20 2.40.1