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=-3.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 0CB53C3A5A1 for ; Wed, 28 Aug 2019 08:35:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D4B53214DA for ; Wed, 28 Aug 2019 08:34:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="TP06DYbD" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726571AbfH1Iez (ORCPT ); Wed, 28 Aug 2019 04:34:55 -0400 Received: from mail-oi1-f194.google.com ([209.85.167.194]:38477 "EHLO mail-oi1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726253AbfH1Iey (ORCPT ); Wed, 28 Aug 2019 04:34:54 -0400 Received: by mail-oi1-f194.google.com with SMTP id q8so1460302oij.5; Wed, 28 Aug 2019 01:34:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=U8FH7AFxalfo9kXqgzeqBM8w1kp/vA0EX4/dnehxzF8=; b=TP06DYbD3V6ERHTB3g0KbjtgqWL9TuvRo0wmUzXGiDGjXKb3S3L4Mb2a/jtVlf2VmP wioNJCGVxlZITAL0k7PPNPIdAr/7KSa7wvD2FvKUEaPfPJ4gFF46ZnXi49F+MOwodDHE odc7xsPY51gjFc+ghK+35ZpYlu5JymD7y5dT9LxeZQJPCr5D45k+sUBfS7tgfeTCuuB5 b4BfOVEE7RxQAv/GGMsa3dRqzx8EaBvDD9rQ6Sw6rTuB9kj/+Dr+G8ORrBzRHG0ZMoWB EEHYTIAdYESfcYmwuq272GcfrQmwEIxFkYSDbrQsqGTXXjdimdbmA8emXt+v76vaDsTN hdOw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=U8FH7AFxalfo9kXqgzeqBM8w1kp/vA0EX4/dnehxzF8=; b=Ri9P7KNua3Xts6sgt7uNghB3hrfmn3j/UrWKi5potBso8GTK4IJdl+HNU8L5wYu4l2 FNX9PpDjxocl12w5yy3zWfleFWtsi/I3n0rIVPtroEbUFmEzhaw1+nJyBpcb616azkbu LSIinBNAjqs84D2dLMDnkMc0x3Ufa51S2BnELjVp7uwCEXnPrcGhyfcI5reoRNmw42bY NzVGOpoaM5H/QkEDUctX++NlgxuYRzXJzuCV0xI8oSTDdagBkCxgb6w6vRTR+ClN80ei 4PxVqfLmbtPIl/6e90qPBwZnvHHea521b+4VlXK2EUTMM5mElxgdjtPs+7uMlzi4EFe4 p7zw== X-Gm-Message-State: APjAAAXGjZwYLsUnwk2dS9wap9z/W7DlRBR5WWt/lyzZ5DkBlIdiXKbf GaaA8VQvKbisl5gyx/fkMGLkjSGo0sDBcJJcU5E= X-Google-Smtp-Source: APXvYqzmD3lOi71p/BZRzvw9jM1MKLJ3Zwe/887SQPAbbvl+RMdE0RaTkaVm1kIc+BH0REmOSCceeJdskb95k+RqEqI= X-Received: by 2002:a54:488e:: with SMTP id r14mr1922852oic.174.1566981293845; Wed, 28 Aug 2019 01:34:53 -0700 (PDT) MIME-Version: 1.0 References: <1564643196-7797-1-git-send-email-wanpengli@tencent.com> <7b1e3025-f513-7068-32ac-4830d67b65ac@intel.com> <20190803202058.GA9316@amt.cnet> <20190826204045.GA24697@amt.cnet> In-Reply-To: From: Wanpeng Li Date: Wed, 28 Aug 2019 16:35:30 +0800 Message-ID: Subject: Re: [PATCH] cpuidle-haltpoll: Enable kvm guest polling when dedicated physical CPUs are available To: Marcelo Tosatti Cc: Paolo Bonzini , "Rafael J. Wysocki" , LKML , kvm , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Linux PM , "Michael S. Tsirkin" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Tue, 27 Aug 2019 at 08:43, Wanpeng Li wrote: > > Cc Michael S. Tsirkin, > On Tue, 27 Aug 2019 at 04:42, Marcelo Tosatti wrote= : > > > > On Tue, Aug 13, 2019 at 08:55:29AM +0800, Wanpeng Li wrote: > > > On Sun, 4 Aug 2019 at 04:21, Marcelo Tosatti wr= ote: > > > > > > > > On Thu, Aug 01, 2019 at 06:54:49PM +0200, Paolo Bonzini wrote: > > > > > On 01/08/19 18:51, Rafael J. Wysocki wrote: > > > > > > On 8/1/2019 9:06 AM, Wanpeng Li wrote: > > > > > >> From: Wanpeng Li > > > > > >> > > > > > >> The downside of guest side polling is that polling is performe= d even > > > > > >> with other runnable tasks in the host. However, even if poll i= n kvm > > > > > >> can aware whether or not other runnable tasks in the same pCPU= , it > > > > > >> can still incur extra overhead in over-subscribe scenario. Now= we can > > > > > >> just enable guest polling when dedicated pCPUs are available. > > > > > >> > > > > > >> Cc: Rafael J. Wysocki > > > > > >> Cc: Paolo Bonzini > > > > > >> Cc: Radim Kr=C4=8Dm=C3=A1=C5=99 > > > > > >> Cc: Marcelo Tosatti > > > > > >> Signed-off-by: Wanpeng Li > > > > > > > > > > > > Paolo, Marcelo, any comments? > > > > > > > > > > Yes, it's a good idea. > > > > > > > > > > Acked-by: Paolo Bonzini Hi Marcelo, If you don't have more concern, I guess Rafael can apply this patch now since the merge window is not too far. Regards, Wanpeng Li