Received: by 2002:a05:6a10:9afc:0:0:0:0 with SMTP id t28csp3734467pxm; Tue, 1 Mar 2022 04:34:31 -0800 (PST) X-Google-Smtp-Source: ABdhPJwtOhiw9k2yPkLLSa22N0jmOuYuuwqAEtcjqsGbW2S5Q2ePBBgQaOmGJt0iGcPrxFTm3mrQ X-Received: by 2002:a05:6a00:26e0:b0:4e1:7131:de2b with SMTP id p32-20020a056a0026e000b004e17131de2bmr27203042pfw.20.1646138071135; Tue, 01 Mar 2022 04:34:31 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1646138071; cv=none; d=google.com; s=arc-20160816; b=qciwu8hQ1LLfgjdu8CkCmg6o7ZJRdq1JYpe39umYH3RAWAumvYCcOfOHVuxQjIIsX9 gDmOrrkVevlMES9d9F3aUuojgjsRTuuOyPdfgJ8G+AJYu6odJNI8t8JBwgjNRGvl+Ge8 4LRpWRiu3qr1eYkeh1lXf0/ayIbDCjgMEbRkx0lSf7sIUpAYa6AiEm92WC/1ZN3d5mlf dePGAnA8fAtjBvwLAZsNgaPWK5XKSLdAFttxbRCoXChgxd4lbDnpdFsD9jBcVdZxSUW9 FER8lg4w8vpD2gtxhXZbXpqXoRGr+K/sdje1PswzXDisAp3fusQGh6sdPKEyCpBZ6qfW xSdQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:feedback-id:content-transfer-encoding :mime-version:references:in-reply-to:message-id:date:subject:cc:to :from; bh=pR3TDR+SRIYeSLxWpkCkrnYTGYJwwW07vJ5fj42zRno=; b=O9D3n7+cEK9qaTv/KC+cuX7ChGZ63VDLiU6kD+CUxUQ4QBxs4YBAebaVxfH4ScBMny zuC+nu/g4hTW1XgKDJxPOpY6drO6TSbAKdVaAD492mqseboV8cDGOpzqo+wso7nmXasp GuiB4zaHAK3THjSl9Z89qCu7cfS+ZXp2NVa3JfUfeau2HFD6CnlbxV6W1dTVFOL/cy7z RZaZD3Jd13PQqoSbRlkeLXOqn/i4RhLGmXXcwC9L0N2Y0IH8jlpy77I+gFwF/zx2zVw4 UC+xtWi/K8YRdPqcMZxkC5UIbc4nOTtk4inUYEU9gXlX9E1trSksKufCaZPvN1qrv/x1 Asxw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id f4-20020a056a00238400b004f38de5b73dsi12824809pfc.344.2022.03.01.04.34.15; Tue, 01 Mar 2022 04:34:31 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234655AbiCALyu (ORCPT + 99 others); Tue, 1 Mar 2022 06:54:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51372 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234647AbiCALyp (ORCPT ); Tue, 1 Mar 2022 06:54:45 -0500 Received: from smtpbg511.qq.com (smtpbg511.qq.com [203.205.250.109]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F3DC8B6CE for ; Tue, 1 Mar 2022 03:54:01 -0800 (PST) X-QQ-mid: bizesmtp74t1646135634tl2iodvi Received: from localhost.localdomain ( [58.240.82.166]) by bizesmtp.qq.com (ESMTP) with id ; Tue, 01 Mar 2022 19:53:52 +0800 (CST) X-QQ-SSF: 01400000002000C0G000B00B0000000 X-QQ-FEAT: P0DaXoo1QzjcMAhnK4u/yQYMF3zXBXRrn0JQ1SpLLeqEqnYuApefM8hFxxdnf 8NQ//F8ooD5ibQr8xHxCd8D3ttwb7A2i8HMMcgJUGJPKOvgGc1ry3juXG5/VyoRg3Bf4ek2 mkpLuL1HBw5FdppUvjmb8HSOQszXGWiZx5uF2MhvkyRu/115m0ZyDnuc5VOq+28FOcXPf95 R/H85R+2NO6Eg8r09JPeZ6bJbGqxaiLY9gM+GfZBsMtgH2VtkyRs+W4lbOQeeqP9K12NKCL UzCffxsHZ7GEKIcOJYne3nHRAO5Bk4QMP0qTXSHBNXzdzryo79wT/EBRxIekdPnZDBEeBKw Yo87KeoxnwQsk1C5zH4Ni1k69XHXsZY4h2YUZUL6DMOQxgKR/A= X-QQ-GoodBg: 2 From: Meng Tang To: mcgrof@kernel.org, keescook@chromium.org, yzaikin@google.com, ebiederm@xmission.com, willy@infradead.org Cc: nixiaoming@huawei.com, nizhen@uniontech.com, zhanglianjie@uniontech.com, sujiaxun@uniontech.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Meng Tang Subject: [PATCH v2 2/2] fs/proc: sysctl: optimize register single one ctl_table Date: Tue, 1 Mar 2022 19:53:41 +0800 Message-Id: <20220301115341.30101-2-tangmeng@uniontech.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220301115341.30101-1-tangmeng@uniontech.com> References: <20220301115341.30101-1-tangmeng@uniontech.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-QQ-SENDSIZE: 520 Feedback-ID: bizesmtp:uniontech.com:qybgforeign:qybgforeign2 X-QQ-Bgrelay: 1 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_PASS,T_SCC_BODY_TEXT_LINE, T_SPF_HELO_TEMPERROR autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sysctls are being moved out of kernel/sysctl.c and out to their own respective subsystems / users to help with easier maintance and avoid merge conflicts. But when we move just one entry and to its own new file the last entry for this new file must be empty, so we are essentialy bloating the kernel one extra empty entry per each newly moved sysctl. To help with this, I have added support for registering just one ctl_table, therefore not bloating the kernel when we move a single ctl_table to its own file. The optimization has been implemented in the previous patch, here use register_sysctl_single() to register single one ctl_table. In this modification, I counted the size changes of each object file during the compilation process. When there is no strip, size changes are as follows: before now save space fs/dcache.o 904936 904760 176bytes fs/exec.o 883584 883440 144bytes fs/namespace.o 1614776 1614616 160bytes fs/notify/dnotify/dnotify.o 255992 255872 120bytes init/do_mounts_initrd.o 296552 296392 160bytes kernel/acct.o 459184 459032 152bytes kernel/delayacct.o 208680 208536 144bytes kernel/kprobes.o 794968 794936 32bytes kernel/panic.o 367696 367560 136bytes When there is exec with 'strip -d', size changes are as follows: before now save space fs/dcache.o 79040 78952 88bytes fs/exec.o 57960 57864 96bytes fs/namespace.o 111904 111824 80bytes fs/notify/dnotify/dnotify.o 8816 8736 80bytes init/do_mounts_initrd.o 4872 4760 112bytes kernel/acct.o 18104 18000 104bytes kernel/delayacct.o 8768 8664 104bytes kernel/kprobes.o 63192 63104 88bytes kernel/panic.o 26760 26672 88bytes Suggested-by: Matthew Wilcox Signed-off-by: Meng Tang --- fs/dcache.c | 5 ++--- fs/exec.c | 5 ++--- fs/namespace.c | 5 ++--- fs/notify/dnotify/dnotify.c | 5 ++--- init/do_mounts_initrd.c | 5 ++--- kernel/acct.c | 5 ++--- kernel/delayacct.c | 5 ++--- kernel/kprobes.c | 5 ++--- kernel/panic.c | 5 ++--- 9 files changed, 18 insertions(+), 27 deletions(-) diff --git a/fs/dcache.c b/fs/dcache.c index c84269c6e8bf..29fed2df79d1 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -190,13 +190,12 @@ static struct ctl_table fs_dcache_sysctls[] = { .maxlen = 6*sizeof(long), .mode = 0444, .proc_handler = proc_nr_dentry, - }, - { } + } }; static int __init init_fs_dcache_sysctls(void) { - register_sysctl_init("fs", fs_dcache_sysctls); + register_sysctl_single("fs", fs_dcache_sysctls); return 0; } fs_initcall(init_fs_dcache_sysctls); diff --git a/fs/exec.c b/fs/exec.c index c2586b791b87..58e9e50b9d98 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -2140,13 +2140,12 @@ static struct ctl_table fs_exec_sysctls[] = { .proc_handler = proc_dointvec_minmax_coredump, .extra1 = SYSCTL_ZERO, .extra2 = SYSCTL_TWO, - }, - { } + } }; static int __init init_fs_exec_sysctls(void) { - register_sysctl_init("fs", fs_exec_sysctls); + register_sysctl_single("fs", fs_exec_sysctls); return 0; } diff --git a/fs/namespace.c b/fs/namespace.c index df172818e1f8..1384fa7f8c79 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -4673,13 +4673,12 @@ static struct ctl_table fs_namespace_sysctls[] = { .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = SYSCTL_ONE, - }, - { } + } }; static int __init init_fs_namespace_sysctls(void) { - register_sysctl_init("fs", fs_namespace_sysctls); + register_sysctl_single("fs", fs_namespace_sysctls); return 0; } fs_initcall(init_fs_namespace_sysctls); diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c index 829dd4a61b66..813a22825be5 100644 --- a/fs/notify/dnotify/dnotify.c +++ b/fs/notify/dnotify/dnotify.c @@ -28,12 +28,11 @@ static struct ctl_table dnotify_sysctls[] = { .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec, - }, - {} + } }; static void __init dnotify_sysctl_init(void) { - register_sysctl_init("fs", dnotify_sysctls); + register_sysctl_single("fs", dnotify_sysctls); } #else #define dnotify_sysctl_init() do { } while (0) diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c index 327962ea354c..d37f24959aa3 100644 --- a/init/do_mounts_initrd.c +++ b/init/do_mounts_initrd.c @@ -28,13 +28,12 @@ static struct ctl_table kern_do_mounts_initrd_table[] = { .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec, - }, - { } + } }; static __init int kernel_do_mounts_initrd_sysctls_init(void) { - register_sysctl_init("kernel", kern_do_mounts_initrd_table); + register_sysctl_single("kernel", kern_do_mounts_initrd_table); return 0; } late_initcall(kernel_do_mounts_initrd_sysctls_init); diff --git a/kernel/acct.c b/kernel/acct.c index 62200d799b9b..c628808c9213 100644 --- a/kernel/acct.c +++ b/kernel/acct.c @@ -83,13 +83,12 @@ static struct ctl_table kern_acct_table[] = { .maxlen = 3*sizeof(int), .mode = 0644, .proc_handler = proc_dointvec, - }, - { } + } }; static __init int kernel_acct_sysctls_init(void) { - register_sysctl_init("kernel", kern_acct_table); + register_sysctl_single("kernel", kern_acct_table); return 0; } late_initcall(kernel_acct_sysctls_init); diff --git a/kernel/delayacct.c b/kernel/delayacct.c index 2c1e18f7c5cf..6b776cbcb559 100644 --- a/kernel/delayacct.c +++ b/kernel/delayacct.c @@ -73,13 +73,12 @@ static struct ctl_table kern_delayacct_table[] = { .proc_handler = sysctl_delayacct, .extra1 = SYSCTL_ZERO, .extra2 = SYSCTL_ONE, - }, - { } + } }; static __init int kernel_delayacct_sysctls_init(void) { - register_sysctl_init("kernel", kern_delayacct_table); + register_sysctl_single("kernel", kern_delayacct_table); return 0; } late_initcall(kernel_delayacct_sysctls_init); diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 94cab8c9ce56..1cf54662e2ed 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -970,13 +970,12 @@ static struct ctl_table kprobe_sysctls[] = { .proc_handler = proc_kprobes_optimization_handler, .extra1 = SYSCTL_ZERO, .extra2 = SYSCTL_ONE, - }, - {} + } }; static void __init kprobe_sysctls_init(void) { - register_sysctl_init("debug", kprobe_sysctls); + register_sysctl_single("debug", kprobe_sysctls); } #endif /* CONFIG_SYSCTL */ diff --git a/kernel/panic.c b/kernel/panic.c index ae5c0ca86016..90f1a0f25139 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -85,13 +85,12 @@ static struct ctl_table kern_panic_table[] = { .proc_handler = proc_dointvec_minmax, .extra1 = SYSCTL_ZERO, .extra2 = SYSCTL_ONE, - }, - { } + } }; static __init int kernel_panic_sysctls_init(void) { - register_sysctl_init("kernel", kern_panic_table); + register_sysctl_single("kernel", kern_panic_table); return 0; } late_initcall(kernel_panic_sysctls_init); -- 2.20.1