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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, 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 BE571C34026 for ; Tue, 18 Feb 2020 16:31:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 946D82067D for ; Tue, 18 Feb 2020 16:31:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="G3iP1uQl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727648AbgBRQbO (ORCPT ); Tue, 18 Feb 2020 11:31:14 -0500 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:26791 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726557AbgBRQbM (ORCPT ); Tue, 18 Feb 2020 11:31:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1582043471; 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=1wux/ShdRZLS6eqfJ1i2bb+05bcGXuWlAmnT6X3Ge3Y=; b=G3iP1uQlW8oxKIQdN6bVlx605MVQ0K+Ld9qEIduHcQj64krHjUC8j5u5rvOc5tFcbV3x0h 9XxYgxuScuGHj7YQtZzbjQEpOwrhCA6wtO5zSVwXASQi0CRy3XR21ZmujKKJ8vMR3Fzpx0 pxBLyT4ZFzkf3gIYaXVnd6NMPXQ2N2E= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-63-PV7vvRLNMn6yMlwRiqpgTg-1; Tue, 18 Feb 2020 11:31:06 -0500 X-MC-Unique: PV7vvRLNMn6yMlwRiqpgTg-1 Received: by mail-wm1-f69.google.com with SMTP id u11so286487wmb.4 for ; Tue, 18 Feb 2020 08:31:06 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=1wux/ShdRZLS6eqfJ1i2bb+05bcGXuWlAmnT6X3Ge3Y=; b=Oi9fLPMvv/X6D6xn3bfD8fWJl13cl5IK+3blym7/8NnlJHLKC8qkF+CK/JIvxO6zLO kyhcFO4UwZIFCwZQd76GtmlXACN76UQmQcmX2wKbmMrGK5zlfGuVizsvo1KZ8T6SLIi3 oFjTWrpkun+bKBCrfqZmzoh+Pt/OP/PLG0P0MOGXUzJoOJvh2DUVSSbyRDKIhDAs6FeM whmyDtEVSdmAEdaXX1ZuhqPzUz+n3g0QhLIHLSBT+G6IBa8s3aDI+wbbMf8gWgRRuVmr +zAH67l0yKFbT5Mya1lV3oDL3LjqaGozyT7rx4Qwl5lK7E35/76oH3hKvtTp0u/UasKc BtvQ== X-Gm-Message-State: APjAAAX4lZ4sk3Z0PU0rd6KolGPBlXCRKLLktHGaozH3Jb9WCDHUZkpL phi4n1X7f/i8kqUVibGIMSm3OM6+hrdjz0tzRdtLx3bsM5zFtWZN82cF9s1YXVOlmcx5kwmfrEj C6dWFzdV5URbNKP0TDynfehwX X-Received: by 2002:a1c:8055:: with SMTP id b82mr4053688wmd.127.1582043465300; Tue, 18 Feb 2020 08:31:05 -0800 (PST) X-Google-Smtp-Source: APXvYqxcbLjDdl8yYBOLssLztWaiKZt1qolfF/drqUpVyQbR31GyH51q/Z7meOxgMs3aCiblWpkLYA== X-Received: by 2002:a1c:8055:: with SMTP id b82mr4053661wmd.127.1582043465086; Tue, 18 Feb 2020 08:31:05 -0800 (PST) Received: from ?IPv6:2001:b07:6468:f312:59c7:c3ee:2dec:d2b4? ([2001:b07:6468:f312:59c7:c3ee:2dec:d2b4]) by smtp.gmail.com with ESMTPSA id e6sm4179931wme.3.2020.02.18.08.31.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Feb 2020 08:31:04 -0800 (PST) Subject: Re: [PATCH v4 1/2] KVM: X86: Less kvmclock sync induced vmexits after VM boots To: Vitaly Kuznetsov , Wanpeng Li Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Joerg Roedel , linux-kernel@vger.kernel.org, kvm@vger.kernel.org References: <1581988630-19182-1-git-send-email-wanpengli@tencent.com> <87r1ys7xpk.fsf@vitty.brq.redhat.com> <87mu9f97uv.fsf@vitty.brq.redhat.com> From: Paolo Bonzini Message-ID: <8804030e-db83-d212-d712-807833f9fd7e@redhat.com> Date: Tue, 18 Feb 2020 17:31:03 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <87mu9f97uv.fsf@vitty.brq.redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 18/02/20 17:29, Vitaly Kuznetsov wrote: >> No, it executes after 5 minutes. I agree that the patch shouldn't be >> really necessary, though you do save on cacheline bouncing due to >> test_and_set_bit. > > True, but the changelog should probably be updated then. Yes, I agree. Paolo