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=-9.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,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 A5F15C433ED for ; Thu, 13 May 2021 12:14:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8C93961285 for ; Thu, 13 May 2021 12:14:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233768AbhEMMPV (ORCPT ); Thu, 13 May 2021 08:15:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40394 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232569AbhEMMOn (ORCPT ); Thu, 13 May 2021 08:14:43 -0400 Received: from mail-ed1-x535.google.com (mail-ed1-x535.google.com [IPv6:2a00:1450:4864:20::535]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC1F0C06174A for ; Thu, 13 May 2021 05:13:31 -0700 (PDT) Received: by mail-ed1-x535.google.com with SMTP id i13so778219edb.9 for ; Thu, 13 May 2021 05:13:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=mWa4cuYWdnztuy24dOOTWOUUVMnygod3WyEh9Qf00zU=; b=We+LLYKoGiersTt6WqDPrcSK51Lc6MXgFTbkzGhFN/ocD0ZXIOw+P17DyD3q67ui5T tqdkSL1/4jjpJArLE4IZ2Oiyx38YYDZd6h1TaDRuqQWCIXYTVLF7AItVBf1albiE7K7D oz+uPCG/JMHz4d9/Is7IPo68AvO7xNtdc5GkTEA3w/fUAjrTSIDocapiUEIL2Mq+nM1C FPPHmdmJoq0fbgPBswCzn44B/OSfkovhqHJ4bSJkYF/XDCZqjBK7c+piSr1G2UGEcJu/ dNmdVOg8ItSd2UdZoE7CGn9Z46gb+xu8lEg6H+943QRn5afJPphnDj6jQa8JClOD+a9W eRKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to; bh=mWa4cuYWdnztuy24dOOTWOUUVMnygod3WyEh9Qf00zU=; b=rkUUu72au98pPdq9250KL/dAHV4bj0axglA85DA23mmuqp8iZZNy4ZkNZdm9QB6K5t BSBnRU8v3ZvdJPipYr9muO//h2JMOuH4uFnQnEfwkF/1kn+SUbnBjSb0DXGUlXBZgpIZ +oP1TG2jtKt0lLN/s+rBfa5ikUsQvoXOpBhm5TLF3KSo7YuPdyB2WuMQmz/ZxWWxDt6+ IsQBrdcUXqIRgaV9acvF/dwIxxy3u0F+Vs3CgNb3osPEDhmZXKgprlUmiANeIbb9TIVh Z+Yd35/pP8VrmiDCRYwJZo/q+4A0YydTmplsWKpNV0SuEaDM/eA7oE64Rw4aUBYHFFZP Pi/w== X-Gm-Message-State: AOAM530Y8O+1auOJtfJ9Go3ma8Z5K5ikc5PdotuRUWTkCJXoegpdXfTx fPWoj8WmlF5IzmAcFSP+iTg= X-Google-Smtp-Source: ABdhPJxAXb2XVYGGSJAAHk6LSo55xCB6vcCI08ADzgATBULwVJ1JBo2q18zAC2ct+yBtfSsyJPBzdA== X-Received: by 2002:aa7:cd0c:: with SMTP id b12mr49659263edw.236.1620908010610; Thu, 13 May 2021 05:13:30 -0700 (PDT) Received: from gmail.com (0526E777.dsl.pool.telekom.hu. [5.38.231.119]) by smtp.gmail.com with ESMTPSA id bn5sm1728174ejb.97.2021.05.13.05.13.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 May 2021 05:13:30 -0700 (PDT) Sender: Ingo Molnar Date: Thu, 13 May 2021 14:13:28 +0200 From: Ingo Molnar To: "Paul E. McKenney" Cc: Paul Gortmaker , linux-kernel@vger.kernel.org, Ingo Molnar , Peter Zijlstra , Frederic Weisbecker Subject: Re: [PATCH] sched/isolation: reconcile rcu_nocbs= and nohz_full= Message-ID: References: <20210419042659.1134916-1-paul.gortmaker@windriver.com> <20210422212448.GJ975577@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210422212448.GJ975577@paulmck-ThinkPad-P17-Gen-1> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Paul E. McKenney wrote: > On Mon, Apr 19, 2021 at 12:26:59AM -0400, Paul Gortmaker wrote: > > We have a mismatch between RCU and isolation -- in relation to what is > > considered the maximum valid CPU number. > > > > This matters because nohz_full= and rcu_nocbs= are joined at the hip; in > > fact the former will enforce the latter. So we don't want a CPU mask to > > be valid for one and denied for the other. > > > > The difference 1st appeared as of v4.15; further details are below. > > I pulled this into -rcu for testing and further review. > > If it should instead go through some other tree: > > Acked-by: Paul E. McKenney Thanks - added this fix to tip:sched/core. Thanks, Ingo