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=-7.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 50230C433B4 for ; Wed, 14 Apr 2021 17:31:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2DDE961179 for ; Wed, 14 Apr 2021 17:31:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233568AbhDNRbx (ORCPT ); Wed, 14 Apr 2021 13:31:53 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:54748 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350698AbhDNRbo (ORCPT ); Wed, 14 Apr 2021 13:31:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1618421482; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Pwu8ITVpaktX/oaFXebOFcED+CIuIn8065SfkxgfWGI=; b=foQvjc3s0ZEtrldIiYePQl5xO747Hgz0vu3XoGP1TESxsTOaU0pU4qU6w9KNZzl+jEFwxl 83ed0eLAcxRthubRE+GmYpo+2WGg9UYKaDYLdc+ZUfqtu8cjb8/5JYHTOJGtJ8Wt/hO77O mhgfRvLkrafo9ddZhkIFTWT38lA+cM0= Received: from mail-qk1-f197.google.com (mail-qk1-f197.google.com [209.85.222.197]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-183-CQdCdmyNPYaUUY8SfeIT7A-1; Wed, 14 Apr 2021 13:31:21 -0400 X-MC-Unique: CQdCdmyNPYaUUY8SfeIT7A-1 Received: by mail-qk1-f197.google.com with SMTP id o4so4954878qkg.2 for ; Wed, 14 Apr 2021 10:31:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:subject:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=Pwu8ITVpaktX/oaFXebOFcED+CIuIn8065SfkxgfWGI=; b=fyyIkFgT8BjKok7FLE9VEriiPvKZhbB4J0L5v+ulojfr39RyptSqy8GA8yHUVzYJbV xD2P01jPXI/5qAz1MO1JAoXOctUCicv4vyTMg5qFE05LVKXI+88VJaWK9WMcPxOv9jCD Jv5e0TQ8d1n9BhpeP2iO2URGIAtn8bVmN35abiZs05Wc4JeRQLELlGzdYTSfY8PCY2sQ 0T+56pLeAuOIlREpPgOaF1Nwct/jWRXYwBZoOD8HNq9hglSf/MpEEiGKTKz1t4pj8GBK ZFrbMwYEcjmyYjg7LUKUNh2nCIK3xqBW90rHvo+6WKrhQ4lzAbCA7USlWbbGcdAq22Km G4HQ== X-Gm-Message-State: AOAM530X/S0RyeFzfURVw2y/4GqVRt+mIbu//PBzEgZ1K3xSEXPU83eu rq7gzQHCbiTRsKuc8c46J+nwyyRF+6gTia+TEzWw4Uy8VQyQD07irXCRhUXg0b1jZskebXzI6O5 pKxl0zb1IubPAyo3yoHG4oq0H X-Received: by 2002:ae9:dcc1:: with SMTP id q184mr6147240qkf.482.1618421480631; Wed, 14 Apr 2021 10:31:20 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyRXvclwrtNw0vyg4pKHWPDmETRkr+Mf1wxudR7KTzhxmhPecsOFB7lkLfuIC0V32mXc/loLw== X-Received: by 2002:ae9:dcc1:: with SMTP id q184mr6147223qkf.482.1618421480434; Wed, 14 Apr 2021 10:31:20 -0700 (PDT) Received: from llong.remote.csb ([2601:191:8500:76c0::cdbc]) by smtp.gmail.com with ESMTPSA id t17sm18505qtr.42.2021.04.14.10.31.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Apr 2021 10:31:19 -0700 (PDT) From: Waiman Long X-Google-Original-From: Waiman Long Subject: Re: [External] : Re: [PATCH v14 4/6] locking/qspinlock: Introduce starvation avoidance into CNA To: Andi Kleen , Waiman Long Cc: Alex Kogan , linux@armlinux.org.uk, Peter Zijlstra , Ingo Molnar , will.deacon@arm.com, arnd@arndb.de, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, bp@alien8.de, hpa@zytor.com, x86@kernel.org, guohanjun@huawei.com, jglauber@marvell.com, steven.sistare@oracle.com, daniel.m.jordan@oracle.com, dave.dice@oracle.com References: <20210401153156.1165900-1-alex.kogan@oracle.com> <20210401153156.1165900-5-alex.kogan@oracle.com> <87mtu2vhzz.fsf@linux.intel.com> <4a9dbfa7-db68-a2dc-9018-a5b74f0f421c@redhat.com> <20210414172602.GW3762101@tassilo.jf.intel.com> Message-ID: <6c968acd-dda2-ed1f-6582-b7811030761e@redhat.com> Date: Wed, 14 Apr 2021 13:31:17 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: <20210414172602.GW3762101@tassilo.jf.intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/14/21 1:26 PM, Andi Kleen wrote: >> The CNA code, if enabled, will be in vmlinux, not in a kernel module. As a >> result, I think a module parameter will be no different from a kernel >> command line parameter in this regard. > You can still change it in /sys at runtime, even if it's in the vmlinux. I see, thank for the clarification. Cheers, Longman