From patchwork Wed Sep 23 18:11:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nitesh Narayan Lal X-Patchwork-Id: 260315 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=-11.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS 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 F38F9C2D0A8 for ; Wed, 23 Sep 2020 18:17:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9C38D20791 for ; Wed, 23 Sep 2020 18:17:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ZXLonv/6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726748AbgIWSRr (ORCPT ); Wed, 23 Sep 2020 14:17:47 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:28914 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726667AbgIWSRl (ORCPT ); Wed, 23 Sep 2020 14:17:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600885060; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:in-reply-to:in-reply-to:references:references; bh=0T1Uh3UwpP4BgdwzDRoRFpQxgh2o5L+P6husKrn72sA=; b=ZXLonv/6mMeyq8A8sZHsbLO2IN29o66hDnZkbPEZ5RCrSZP7VX6+Xs5X3Uoch0C8bJV+Z2 qhIncgtGzSnyejapbsOMu3SO+cPf7KhDYVslmKtYe+AJJZIS6XBNeAoKj4jUTI84cCEFz1 PqSBN46gW+HMDWoNyArJla7uyPJPXIk= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-107-0cfgVWp3PuyEcRa8Ao44zg-1; Wed, 23 Sep 2020 14:17:37 -0400 X-MC-Unique: 0cfgVWp3PuyEcRa8Ao44zg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C5F3164094; Wed, 23 Sep 2020 18:17:34 +0000 (UTC) Received: from virtlab719.virt.lab.eng.bos.redhat.com (virtlab719.virt.lab.eng.bos.redhat.com [10.19.153.15]) by smtp.corp.redhat.com (Postfix) with ESMTP id EE4DD5C1C7; Wed, 23 Sep 2020 18:17:32 +0000 (UTC) From: Nitesh Narayan Lal To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, intel-wired-lan@lists.osuosl.org, frederic@kernel.org, mtosatti@redhat.com, sassmann@redhat.com, jesse.brandeburg@intel.com, lihong.yang@intel.com, helgaas@kernel.org, nitesh@redhat.com, jeffrey.t.kirsher@intel.com, jacob.e.keller@intel.com, jlelli@redhat.com, hch@infradead.org, bhelgaas@google.com, mike.marciniszyn@intel.com, dennis.dalessandro@intel.com, thomas.lendacky@amd.com, jerinj@marvell.com, mathias.nyman@intel.com, jiri@nvidia.com, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org Subject: [PATCH v2 2/4] sched/isolation: Extend nohz_full to isolate managed IRQs Date: Wed, 23 Sep 2020 14:11:24 -0400 Message-Id: <20200923181126.223766-3-nitesh@redhat.com> In-Reply-To: <20200923181126.223766-1-nitesh@redhat.com> References: <20200923181126.223766-1-nitesh@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Extend nohz_full feature set to include isolation from managed IRQS. This is required specifically for setups that only uses nohz_full and still requires isolation for maintaining lower latency for the listed CPUs. Having this change will ensure that the kernel functions that were using HK_FLAG_MANAGED_IRQ to derive cpumask for pinning various jobs/IRQs do not enqueue anything on the CPUs listed under nohz_full. Suggested-by: Frederic Weisbecker Signed-off-by: Nitesh Narayan Lal --- kernel/sched/isolation.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c index 5a6ea03f9882..9df9598a9e39 100644 --- a/kernel/sched/isolation.c +++ b/kernel/sched/isolation.c @@ -141,7 +141,7 @@ static int __init housekeeping_nohz_full_setup(char *str) unsigned int flags; flags = HK_FLAG_TICK | HK_FLAG_WQ | HK_FLAG_TIMER | HK_FLAG_RCU | - HK_FLAG_MISC | HK_FLAG_KTHREAD; + HK_FLAG_MISC | HK_FLAG_KTHREAD | HK_FLAG_MANAGED_IRQ; return housekeeping_setup(str, flags); }