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[2620:137:e000::1:20]) by mx.google.com with ESMTP id l17-20020a170906415100b006df76385c57si2232277ejk.247.2022.03.25.03.59.09; Fri, 25 Mar 2022 03:59:34 -0700 (PDT) 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; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=XfO1haCR; 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; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349166AbiCXJQs (ORCPT + 99 others); Thu, 24 Mar 2022 05:16:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349151AbiCXJQl (ORCPT ); Thu, 24 Mar 2022 05:16:41 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 2401F3FD93 for ; Thu, 24 Mar 2022 02:15:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1648113309; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OJgscDC9GXXgE5qcEpR/61U9wQz24uDUwpyxgmBF8s0=; b=XfO1haCR21/PlkUraHDzleOejUpxIvOiFRv3C7o9DyyZM3A+MFIoc9sEwgrjPrsn7LF7Ti 1WzTuUBdvGOw1AGBqBNj+Dvv79hi5P4GqQiF6yot1lVT/zVvSO4TnSq0h4E1QhnQo0RUla vAFpKuEKbbNAZ4LyH5QNlgrKqqZzl1E= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-119-ChabECUPNA6WQ63NdpyE_w-1; Thu, 24 Mar 2022 05:15:04 -0400 X-MC-Unique: ChabECUPNA6WQ63NdpyE_w-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8156F1066559; Thu, 24 Mar 2022 09:15:03 +0000 (UTC) Received: from shodan.usersys.redhat.com (unknown [10.43.17.22]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 31BCB403176; Thu, 24 Mar 2022 09:15:03 +0000 (UTC) Received: by shodan.usersys.redhat.com (Postfix, from userid 1000) id 346E41C02C1; Thu, 24 Mar 2022 10:15:02 +0100 (CET) From: Artem Savkov To: tglx@linutronix.de, jpoimboe@redhat.com, netdev@vger.kernel.org Cc: davem@davemloft.net, yoshfuji@linux-ipv6.org, dsahern@kernel.org, linux-kernel@vger.kernel.org, Artem Savkov Subject: [PATCH v2 0/2] Upper bound mode for kernel timers Date: Thu, 24 Mar 2022 10:14:58 +0100 Message-Id: <20220324091500.2638745-1-asavkov@redhat.com> In-Reply-To: <20220323184026.wkj55y55jbeumngs@treble> References: <20220323184026.wkj55y55jbeumngs@treble> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 X-Spam-Status: No, score=-3.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable 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 As previously discussed [1] we had a report of a regression in TCP keepalive timer where timers were up to 4 minutes late resulting in disconnects. This patchset tries to fix the problem by introducing upper bound kernel timers and making tcp keepalive timer use those. [1] https://lore.kernel.org/all/20210302001054.4qgrvnkltvkgikzr@treble/T/#u --- Changes in v2: - TIMER_UPPER_BOUND flag description added as a comment in timer.h - Code style fixes - More elaborate commit message in timer commit Artem Savkov (2): timer: introduce upper bound timers net: make tcp keepalive timer upper bound include/linux/timer.h | 6 +++++- kernel/time/timer.c | 36 ++++++++++++++++++++------------- net/ipv4/inet_connection_sock.c | 2 +- 3 files changed, 28 insertions(+), 16 deletions(-) -- 2.34.1