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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 51276C433EF for ; Wed, 20 Oct 2021 12:04:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2929661212 for ; Wed, 20 Oct 2021 12:04:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230217AbhJTMGo (ORCPT ); Wed, 20 Oct 2021 08:06:44 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:56707 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230111AbhJTMGn (ORCPT ); Wed, 20 Oct 2021 08:06:43 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1634731469; 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=UE/l4uetJOxWMqc3F4JFjX4DgIjZidmlZiM6BKW1Wgs=; b=X1O7AK1csLIoX3t+oSNx69w/PFb+PY9fpyHKJvJMGCJGJIuMRF5CMdXn7neaUdHWznP08+ CaAd5brTvBCJgBTwMpGGPa19fbkcoDmaLs7SHqXDWOtKgKGV+/k5w9frcsbrFbTrtJBkaN GvVAVXsM3vV8XSTqfMfJ9qpBbyTuTHI= Received: from mail-ed1-f72.google.com (mail-ed1-f72.google.com [209.85.208.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-344-4l3KnLdPPFinRtFuRT-xHw-1; Wed, 20 Oct 2021 08:04:27 -0400 X-MC-Unique: 4l3KnLdPPFinRtFuRT-xHw-1 Received: by mail-ed1-f72.google.com with SMTP id c25-20020a056402143900b003dc19782ea8so17301615edx.3 for ; Wed, 20 Oct 2021 05:04:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=UE/l4uetJOxWMqc3F4JFjX4DgIjZidmlZiM6BKW1Wgs=; b=U8Qs+0gK5oxO32+7L20SRl3/ij0pk4DANy2wUd6grez4BXywe9sJzmjndRoqFBic/p D978yKdrLYHwPo36EuCxBo8n+Zgh5SqmODvH8r1kXnv5rkUQV7wtla6m19MlFCjUtulY gBeMBP1aC2Tot8LxVHQyOICvDxq5z5iiTMUJ7X8L1zkUNpBW/SdXlLeBkd+PW7aAFMDS E15Sd5gQYHmsZaHLYhVEEDCgdBB+ZdmCQVF/7uMDCxfOOgGr4Fj/1oEU29GQlbSrQcbx CZHazV1LRM6Nj4okFJlXkrafX75B/n3YEvghNXUKP+lFRpBFNre/a171wZzhtvZYJb2H 0xaQ== X-Gm-Message-State: AOAM532fVYLwIKWD/TfIFbXXlAtGymBnvHqUzdItIVYIDF/u54AL+r50 LzUMwBNnIzstzOAmU30f9AgOakYziFPCD5z/zOCiU77bkmjLfjZLVXBYyt0Yf4xae2weprkzkqG c4MHxb3YPNBop X-Received: by 2002:a50:e1c4:: with SMTP id m4mr61532600edl.307.1634731466550; Wed, 20 Oct 2021 05:04:26 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyZ5C06nGEqIWM/xJH71Ww90rK/u6cjEMP7r0VYOQvRtgXosZQm6GVJfl1z5ecQizV7PxnNyw== X-Received: by 2002:a50:e1c4:: with SMTP id m4mr61532568edl.307.1634731466289; Wed, 20 Oct 2021 05:04:26 -0700 (PDT) Received: from ?IPV6:2001:b07:6468:f312:c8dd:75d4:99ab:290a? ([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id rk9sm955443ejb.31.2021.10.20.05.04.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 20 Oct 2021 05:04:25 -0700 (PDT) Message-ID: Date: Wed, 20 Oct 2021 14:04:23 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.1.0 Subject: Re: [PATCH] rcuwait: do not enter RCU protection unless a wakeup is needed Content-Language: en-US To: Wanpeng Li Cc: Peter Zijlstra , LKML , kvm , Davidlohr Bueso , Oleg Nesterov , Ingo Molnar , "Paul E . McKenney" , Wanpeng Li References: <20211020110638.797389-1-pbonzini@redhat.com> <98a72081-6a2b-b644-d029-edd03da84135@redhat.com> From: Paolo Bonzini In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 20/10/21 14:01, Wanpeng Li wrote: > Yes, in the attachment. > > Wanpeng This one does not have CONFIG_PREEMPT=y, let alone CONFIG_PREEMPT_RCU. It's completely impossible that this patch has an effect without those options. Paolo