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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 425A9C4332F for ; Thu, 14 Dec 2023 11:38:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1444177AbjLNLig (ORCPT ); Thu, 14 Dec 2023 06:38:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37898 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1444083AbjLNLi0 (ORCPT ); Thu, 14 Dec 2023 06:38:26 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D4CA1181 for ; Thu, 14 Dec 2023 03:38:32 -0800 (PST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 228F211FB; Thu, 14 Dec 2023 03:39:18 -0800 (PST) Received: from [10.1.197.60] (eglon.cambridge.arm.com [10.1.197.60]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 19F123F738; Thu, 14 Dec 2023 03:38:29 -0800 (PST) Message-ID: <08b75c00-0451-e395-4bc7-11eacaf6a5dd@arm.com> Date: Thu, 14 Dec 2023 11:38:28 +0000 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux aarch64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH v7 21/24] x86/resctrl: Allow overflow/limbo handlers to be scheduled on any-but cpu Content-Language: en-GB To: babu.moger@amd.com, x86@kernel.org, linux-kernel@vger.kernel.org Cc: Fenghua Yu , Reinette Chatre , Thomas Gleixner , Ingo Molnar , Borislav Petkov , H Peter Anvin , shameerali.kolothum.thodi@huawei.com, D Scott Phillips OS , carl@os.amperecomputing.com, lcherian@marvell.com, bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com, baolin.wang@linux.alibaba.com, Jamie Iles , Xin Hao , peternewman@google.com, dfustini@baylibre.com, amitsinght@marvell.com References: <20231025180345.28061-1-james.morse@arm.com> <20231025180345.28061-22-james.morse@arm.com> <6f90a9c6-d474-4173-9f74-a51675b10e6f@amd.com> From: James Morse In-Reply-To: <6f90a9c6-d474-4173-9f74-a51675b10e6f@amd.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Babu, On 09/11/2023 20:51, Moger, Babu wrote: > On 10/25/23 13:03, James Morse wrote: >> When a CPU is taken offline resctrl may need to move the overflow or >> limbo handlers to run on a different CPU. >> >> Once the offline callbacks have been split, cqm_setup_limbo_handler() >> will be called while the CPU that is going offline is still present >> in the cpu_mask. >> >> Pass the CPU to exclude to cqm_setup_limbo_handler() and >> mbm_setup_overflow_handler(). These functions can use a variant of >> cpumask_any_but() when selecting the CPU. -1 is used to indicate no CPUs >> need excluding. >> >> A subsequent patch moves these calls to be before CPUs have been removed, >> so this exclude_cpus behaviour is temporary. > Reviewed-by: Babu Moger Thanks! James