From patchwork Thu Jan 28 16:21:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Dumazet X-Patchwork-Id: 373106 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 87611C433E0 for ; Thu, 28 Jan 2021 16:22:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4D62764E14 for ; Thu, 28 Jan 2021 16:22:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232213AbhA1QWj (ORCPT ); Thu, 28 Jan 2021 11:22:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39006 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231148AbhA1QWd (ORCPT ); Thu, 28 Jan 2021 11:22:33 -0500 Received: from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com [IPv6:2607:f8b0:4864:20::102d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DBDB9C061573 for ; Thu, 28 Jan 2021 08:21:52 -0800 (PST) Received: by mail-pj1-x102d.google.com with SMTP id u4so4600070pjn.4 for ; Thu, 28 Jan 2021 08:21:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=+nxsSzios4I+oPIFkvhWEajlhJmnuXBsPeg2HazMxs4=; b=skL3+ZcL+7RJollywvy3MLLsejkCnp+uI8lFJx8I3WVjG+0D1sVHhZNo2axZgqbp6A 8R39XIytXTlM4tAZOqsgb/8TtphV+azxTLbpfI3X2BZ5DW/+U2k2KrA1Gmr7WjK1zBDk 8Vf3QrJF7mC9/Ldw2lVw1t0nDGV7w0OZJWfywKJhHFriC86O5A43WjN9nTu4qJFuUbYG GmIIA1Y3U06lW0jo5QSMJcgfF+oDMgau/RVYL+Yr47ry4Nc92Uc+3I3SI9gum+WBtRlo 30JPuLCdn7fg487QQ8f2JFsbh0FYVVUqAHXhlc1u2rzbTC+sMOOhQ2IIdvAh4whZocLx +aRQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=+nxsSzios4I+oPIFkvhWEajlhJmnuXBsPeg2HazMxs4=; b=IbBiXa0V/a9fwDXl24rd5Ups2P6hRy6Xa7USlynFB/Xdph3HAyz2iduPNYj4OndWmn wNDoZt6KP5yjAiGhB3SldHnDIX8HrPfE+FAD+/LWE15Vae2eEFi7qVltjd9ElZV3RqH/ iMU2lPMw4Qca+uzNu3jXc7pPpOk9PFcky2lbMdyN/cxrAcoea0xUQcVTM3TEZ8lD8swR VGtRD+TUc0Ho22GEGY2p17+dohZr645sfTlq3FliSaG5eLcODf9XeQXJ9wEIwel44Sti w57uywBZ6plPgAT+INqMVvHu2S6yGZhYTu1PdwgZK3EVWQh/f9TxlhaLKdf1J7Nr8PRE 8rAg== X-Gm-Message-State: AOAM531sUu4rYG5dvfF07ZbCmY814hhaUVs8BVnvYxrAuVkSvENCIdTS v3WwYAry2pkT5gwuzyNPIiM= X-Google-Smtp-Source: ABdhPJz12aGRze9krC0TDlo5os1LjbajeByTiZIJ64G6EmMR/7AboO++wqsvXkDQ6JPUgJTfqF1CqQ== X-Received: by 2002:a17:90a:5911:: with SMTP id k17mr155094pji.152.1611850912493; Thu, 28 Jan 2021 08:21:52 -0800 (PST) Received: from edumazet1.svl.corp.google.com ([2620:15c:2c4:201:b957:52cf:4cb2:3a3e]) by smtp.gmail.com with ESMTPSA id x81sm6481609pfc.46.2021.01.28.08.21.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Jan 2021 08:21:51 -0800 (PST) From: Eric Dumazet To: "David S . Miller" , Jakub Kicinski Cc: netdev , Eric Dumazet , Eric Dumazet Subject: [PATCH net-next] net: proc: speedup /proc/net/netstat Date: Thu, 28 Jan 2021 08:21:45 -0800 Message-Id: <20210128162145.1703601-1-eric.dumazet@gmail.com> X-Mailer: git-send-email 2.30.0.280.ga3ce27912f-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Eric Dumazet Use cache friendly helpers to better use cpu caches while reading /proc/net/netstat Tested on a platform with 256 threads (AMD Rome) Before: 305 usec spent in netstat_seq_show() After: 130 usec spent in netstat_seq_show() Signed-off-by: Eric Dumazet --- net/ipv4/proc.c | 48 +++++++++++++++++++++++++++++++++++------------- 1 file changed, 35 insertions(+), 13 deletions(-) diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index 63cd370ea29dbd21bc8d82f726af3e3f76c7f807..6d46297a99f8d94abc27c737a02dea4d64b6c1d6 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -464,30 +464,52 @@ static int snmp_seq_show(struct seq_file *seq, void *v) */ static int netstat_seq_show(struct seq_file *seq, void *v) { - int i; + const int ip_cnt = ARRAY_SIZE(snmp4_ipextstats_list) - 1; + const int tcp_cnt = ARRAY_SIZE(snmp4_net_list) - 1; struct net *net = seq->private; + unsigned long *buff; + int i; seq_puts(seq, "TcpExt:"); - for (i = 0; snmp4_net_list[i].name; i++) + for (i = 0; i < tcp_cnt; i++) seq_printf(seq, " %s", snmp4_net_list[i].name); seq_puts(seq, "\nTcpExt:"); - for (i = 0; snmp4_net_list[i].name; i++) - seq_printf(seq, " %lu", - snmp_fold_field(net->mib.net_statistics, - snmp4_net_list[i].entry)); - + buff = kzalloc(max(tcp_cnt * sizeof(long), ip_cnt * sizeof(u64)), + GFP_KERNEL); + if (buff) { + snmp_get_cpu_field_batch(buff, snmp4_net_list, + net->mib.net_statistics); + for (i = 0; i < tcp_cnt; i++) + seq_printf(seq, " %lu", buff[i]); + } else { + for (i = 0; i < tcp_cnt; i++) + seq_printf(seq, " %lu", + snmp_fold_field(net->mib.net_statistics, + snmp4_net_list[i].entry)); + } seq_puts(seq, "\nIpExt:"); - for (i = 0; snmp4_ipextstats_list[i].name; i++) + for (i = 0; i < ip_cnt; i++) seq_printf(seq, " %s", snmp4_ipextstats_list[i].name); seq_puts(seq, "\nIpExt:"); - for (i = 0; snmp4_ipextstats_list[i].name; i++) - seq_printf(seq, " %llu", - snmp_fold_field64(net->mib.ip_statistics, - snmp4_ipextstats_list[i].entry, - offsetof(struct ipstats_mib, syncp))); + if (buff) { + u64 *buff64 = (u64 *)buff; + memset(buff64, 0, ip_cnt * sizeof(u64)); + snmp_get_cpu_field64_batch(buff64, snmp4_ipextstats_list, + net->mib.ip_statistics, + offsetof(struct ipstats_mib, syncp)); + for (i = 0; i < ip_cnt; i++) + seq_printf(seq, " %llu", buff64[i]); + } else { + for (i = 0; i < ip_cnt; i++) + seq_printf(seq, " %llu", + snmp_fold_field64(net->mib.ip_statistics, + snmp4_ipextstats_list[i].entry, + offsetof(struct ipstats_mib, syncp))); + } + kfree(buff); seq_putc(seq, '\n'); mptcp_seq_show(seq); return 0;