From mboxrd@z Thu Jan 1 00:00:00 1970 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=-3.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=no 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 5432AC18E5B for ; Wed, 1 Apr 2020 12:15:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 18010206F8 for ; Wed, 1 Apr 2020 12:15:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FVv4cRBu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732481AbgDAMPe (ORCPT ); Wed, 1 Apr 2020 08:15:34 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:33262 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727439AbgDAMPe (ORCPT ); Wed, 1 Apr 2020 08:15:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585743332; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=dMRXdlkqaWAJr6EkBSZ3lz8D5ceOHGNbk9wL55ZxWV4=; b=FVv4cRBu9hX+eBF4HJ2lYhSrg677ZTP1zPmWhC04IrY5U0kyhNZqRpbNEqVondP774jkPM byn3pERDIUpkstdO8i4aIIQtsLHkreuC/J+F7QiklyaE7IuH4A9HaAkOYfQRgvXjgq/8Q2 T3ccSgHLNZBa4s37aQXWwNN9eLnMerk= 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-67-s4pZ_xONOt2KeyqqukBeWA-1; Wed, 01 Apr 2020 08:15:31 -0400 X-MC-Unique: s4pZ_xONOt2KeyqqukBeWA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B56B4800D5F; Wed, 1 Apr 2020 12:15:29 +0000 (UTC) Received: from fuller.cnet (ovpn-116-11.gru2.redhat.com [10.97.116.11]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3C8ECDA0F2; Wed, 1 Apr 2020 12:15:29 +0000 (UTC) Received: by fuller.cnet (Postfix, from userid 1000) id B7B7142FDD16; Wed, 1 Apr 2020 09:15:03 -0300 (-03) Message-ID: <20200401121342.930480720@redhat.com> User-Agent: quilt/0.66 Date: Wed, 01 Apr 2020 09:10:20 -0300 From: Marcelo Tosatti To: linux-kernel@vger.kernel.org Cc: Frederic Weisbecker , Chris Friesen , Thomas Gleixner , Peter Zijlstra , Andrew Morton , Jim Somerville , Christoph Lameter , Frederic Weisbecker , Marcelo Tosatti Subject: [patch 2/4] isolation: set HK_FLAG_SCHED on nohz_full CPUs References: <20200401121018.104226700@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Avoid idle load balancing on nohz_full CPUs. This avoids assigning tasks to such CPUs, when they enter idle. Suggested-by: Frederic Weisbecker Signed-off-by: Marcelo Tosatti Index: linux-2.6/kernel/sched/isolation.c =================================================================== --- linux-2.6.orig/kernel/sched/isolation.c +++ linux-2.6/kernel/sched/isolation.c @@ -140,7 +140,8 @@ static int __init housekeeping_nohz_full { unsigned int flags; - flags = HK_FLAG_TICK | HK_FLAG_WQ | HK_FLAG_TIMER | HK_FLAG_RCU | HK_FLAG_MISC; + flags = HK_FLAG_TICK | HK_FLAG_WQ | HK_FLAG_TIMER | HK_FLAG_RCU | + HK_FLAG_MISC | HK_FLAG_SCHED; return housekeeping_setup(str, flags); }