From patchwork Fri May 5 11:33:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "liujian (CE)" X-Patchwork-Id: 13232469 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 A9A63C77B7F for ; Fri, 5 May 2023 11:25:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231811AbjEELYr (ORCPT ); Fri, 5 May 2023 07:24:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33760 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231751AbjEELYl (ORCPT ); Fri, 5 May 2023 07:24:41 -0400 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B4CB1A12A; Fri, 5 May 2023 04:24:35 -0700 (PDT) Received: from canpemm500010.china.huawei.com (unknown [172.30.72.55]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4QCSwr195CzpW6K; Fri, 5 May 2023 19:23:24 +0800 (CST) Received: from huawei.com (10.175.101.6) by canpemm500010.china.huawei.com (7.192.105.118) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Fri, 5 May 2023 19:24:31 +0800 From: Liu Jian To: , , , , , , , , , , , , , , , , , , , , CC: , , , , Subject: [PATCH 7/9] softirq,net: Use softirq_needs_break() Date: Fri, 5 May 2023 19:33:13 +0800 Message-ID: <20230505113315.3307723-8-liujian56@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230505113315.3307723-1-liujian56@huawei.com> References: <20230505113315.3307723-1-liujian56@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To canpemm500010.china.huawei.com (7.192.105.118) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: Peter Zijlstra SoftIRQs provide their own timeout/break code now, use that. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Liu Jian --- Documentation/admin-guide/sysctl/net.rst | 11 +---------- net/core/dev.c | 6 +----- net/core/dev.h | 1 - net/core/sysctl_net_core.c | 8 -------- 4 files changed, 2 insertions(+), 24 deletions(-) diff --git a/Documentation/admin-guide/sysctl/net.rst b/Documentation/admin-guide/sysctl/net.rst index 466c560b0c30..095c60788c61 100644 --- a/Documentation/admin-guide/sysctl/net.rst +++ b/Documentation/admin-guide/sysctl/net.rst @@ -267,16 +267,7 @@ netdev_budget Maximum number of packets taken from all interfaces in one polling cycle (NAPI poll). In one polling cycle interfaces which are registered to polling are -probed in a round-robin manner. Also, a polling cycle may not exceed -netdev_budget_usecs microseconds, even if netdev_budget has not been -exhausted. - -netdev_budget_usecs ---------------------- - -Maximum number of microseconds in one NAPI polling cycle. Polling -will exit when either netdev_budget_usecs have elapsed during the -poll cycle or the number of packets processed reaches netdev_budget. +probed in a round-robin manner. netdev_max_backlog ------------------ diff --git a/net/core/dev.c b/net/core/dev.c index 735096d42c1d..70b6726beee6 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4321,7 +4321,6 @@ int netdev_tstamp_prequeue __read_mostly = 1; unsigned int sysctl_skb_defer_max __read_mostly = 64; int netdev_budget __read_mostly = 300; /* Must be at least 2 jiffes to guarantee 1 jiffy timeout */ -unsigned int __read_mostly netdev_budget_usecs = 2 * USEC_PER_SEC / HZ; int weight_p __read_mostly = 64; /* old backlog weight */ int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */ int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */ @@ -6659,8 +6658,6 @@ static int napi_threaded_poll(void *data) static __latent_entropy void net_rx_action(struct softirq_action *h) { struct softnet_data *sd = this_cpu_ptr(&softnet_data); - unsigned long time_limit = jiffies + - usecs_to_jiffies(READ_ONCE(netdev_budget_usecs)); int budget = READ_ONCE(netdev_budget); LIST_HEAD(list); LIST_HEAD(repoll); @@ -6699,8 +6696,7 @@ static __latent_entropy void net_rx_action(struct softirq_action *h) * Allow this to run for 2 jiffies since which will allow * an average latency of 1.5/HZ. */ - if (unlikely(budget <= 0 || - time_after_eq(jiffies, time_limit))) { + if (unlikely(budget <= 0 || softirq_needs_break(h))) { sd->time_squeeze++; break; } diff --git a/net/core/dev.h b/net/core/dev.h index e075e198092c..e64a60c767ab 100644 --- a/net/core/dev.h +++ b/net/core/dev.h @@ -39,7 +39,6 @@ void dev_addr_check(struct net_device *dev); /* sysctls not referred to from outside net/core/ */ extern int netdev_budget; -extern unsigned int netdev_budget_usecs; extern unsigned int sysctl_skb_defer_max; extern int netdev_tstamp_prequeue; extern int netdev_unregister_timeout_secs; diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c index 782273bb93c2..59765c805f5b 100644 --- a/net/core/sysctl_net_core.c +++ b/net/core/sysctl_net_core.c @@ -595,14 +595,6 @@ static struct ctl_table net_core_table[] = { .extra1 = SYSCTL_ONE, .extra2 = &max_skb_frags, }, - { - .procname = "netdev_budget_usecs", - .data = &netdev_budget_usecs, - .maxlen = sizeof(unsigned int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = SYSCTL_ZERO, - }, { .procname = "fb_tunnels_only_for_init_net", .data = &sysctl_fb_tunnels_only_for_init_net,