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 A667DC3A5A1 for ; Wed, 28 Aug 2019 08:47:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 780E923403 for ; Wed, 28 Aug 2019 08:47:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="fF1VTJyo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726378AbfH1IrZ (ORCPT ); Wed, 28 Aug 2019 04:47:25 -0400 Received: from mail-oi1-f193.google.com ([209.85.167.193]:34119 "EHLO mail-oi1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726300AbfH1IrY (ORCPT ); Wed, 28 Aug 2019 04:47:24 -0400 Received: by mail-oi1-f193.google.com with SMTP id g128so1503793oib.1; Wed, 28 Aug 2019 01:47:24 -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=wvXkpVgy6884rDBDub7GSrouN3alYy0RjubNjRU4D8c=; b=fF1VTJyoZfOh/nue2zV6YK0gz/XCdIae5JY/qHfApx9B7F2xZT2NBmDMMpguRZNaZD KPxZJa9DWjfbKJxoKa5zhA3DXFM8IWlFPzwTQ4omHTIo5ZCDmX1QCuQgvNTbo09iOvEp yhAV8mM74MNFpQ8ezqwXpcITtWQAyzmryrBqw0digdqAFDZa0jNCBP9xCDw43BBeKr32 scty0zVhhc/5xdluSu6mvF6iBiSx+SNFOSlFOCmDhAISSHTA2q7YTEAX76RvzgkV93i+ VUUtDnDXVX8C2dqSyd6/tZIjHxJAFnDJqCsLkCK1euNorCqdpODqosOL+9CUkmkk7EXB +NQA== 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=wvXkpVgy6884rDBDub7GSrouN3alYy0RjubNjRU4D8c=; b=qiRrWS/VQ3oYacHXTIkzAZ4LWlHDNbh6lE3kcpSSCdgXmQOHlakU3S/31qJF6Dqyvt Up9eZFf8Nxxq+lu/Zefhj1VoANwk1gT0SYGIzrMSmX8ypqpheSY6cRd0r6sqz2E/0xr7 dNm+h2pTvHVt9r26vPAcUowXECsaIiiW6lWWLSyw8XXCIa7hMWT1Zy4xvGFvnrwYmpSb 0QGeHJ1uxbRJDON1m5gwtu3TAk30zsCuhHynF4+qdi81msPbm7zpZJYwI93mkag4td48 tEaNTym/ZI3XIm/woua71mYsS/nec+CQYf9NGAtU2z1/W3ar6SFi5/AnlSEgwRFro8/q MCHg== X-Gm-Message-State: APjAAAXgPsFUwWMku4hRauOp8Q6PNBGlbjOZvzkv1cvso2Femtg4w6MV ohXhyS43P+YXQNeLMJMSm2iVB7zT3obt+gwRTlg= X-Google-Smtp-Source: APXvYqypLx3K4rWNLLZYA/GQnRqFih0CeElXVoPUwwnmxm+jKccr7fsFsDB0jQwV9ey6FHJU6J/HlaktN6yEMFzdUmE= X-Received: by 2002:aca:d410:: with SMTP id l16mr1887721oig.141.1566982043664; Wed, 28 Aug 2019 01:47:23 -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 16:48:00 +0800 Message-ID: Subject: Re: [PATCH] cpuidle-haltpoll: Enable kvm guest polling when dedicated physical CPUs are available To: "Rafael J. Wysocki" Cc: Marcelo Tosatti , 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: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On Wed, 28 Aug 2019 at 16:45, Rafael J. Wysocki wrote: > > On Wed, Aug 28, 2019 at 10:34 AM Wanpeng Li wrote: > > > > 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 w= rote: > > > > > > > > On Tue, Aug 13, 2019 at 08:55:29AM +0800, Wanpeng Li wrote: > > > > > On Sun, 4 Aug 2019 at 04:21, Marcelo Tosatti wrote: > > > > > > > > > > > > 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 perf= ormed even > > > > > > > >> with other runnable tasks in the host. However, even if po= ll in 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 availab= le. > > > > > > > >> > > > > > > > >> 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. > > I will likely queue it up later today and it will go to linux-next > early next week. Thank you, Rafael. Regards, Wanpeng Li