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=0.3 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, URG_BIZ 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 E69FFC43A1D for ; Thu, 12 Jul 2018 12:00:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8A3152086E for ; Thu, 12 Jul 2018 12:00:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="edicngku" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8A3152086E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732579AbeGLMKE (ORCPT ); Thu, 12 Jul 2018 08:10:04 -0400 Received: from twosheds.infradead.org ([90.155.92.209]:42296 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726701AbeGLMKE (ORCPT ); Thu, 12 Jul 2018 08:10:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=twosheds.20170209; h=Mime-Version:Date:Content-Type: References:In-Reply-To:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=9xAT8AqGWH18zuxQmZenqCk43rq/cIuD4j4bOxhcYuk=; b=edicngku313aeGZwGgbGjUWeO Ff1veN/TXeYs35V0cQ6bUe4DGWBl1Zkti2AULcTF5YNlmSjtNBviTMgZ9dTMcP8Ddzk6FCii+1Vlo OEhvKQGJzpUOozUb6cw3zm6EpN2PJ6XYnSS/TZ4n4M4MYOYa08hyMH1Chx1x24Vghu2li/6LdaO2j 76g2ZSjMLGG62Bkgpu3nt0dQ/Zn2IVSPSTV8UIVlI5UohMp4NYKdTt+6Xv9APesCww44tg4m1Dxwl nOVt3972ruOb6P3AN3jUPjLGOMy3gAxeiancTK2gCQL/V+2gKJkVqhuOy0bpCFUhSq3ZsBRsBjL/v S0ryLlRMw==; Received: from [2001:8b0:10b:1::2fb] by twosheds.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fdaH5-00035a-2r; Thu, 12 Jul 2018 12:00:43 +0000 Message-ID: <1531396842.8759.125.camel@infradead.org> Subject: Re: [RFC] Make need_resched() return true when rcu_urgent_qs requested From: David Woodhouse To: paulmck@linux.vnet.ibm.com Cc: Christian Borntraeger , Peter Zijlstra , mhillenb@amazon.de, linux-kernel , kvm In-Reply-To: <20180711210828.GD3593@linux.vnet.ibm.com> References: <1531169145.26547.8.camel@infradead.org> <20180709210532.GH3593@linux.vnet.ibm.com> <20180709220823.GA18045@linux.vnet.ibm.com> <1531319025.8759.57.camel@infradead.org> <20180711144303.GQ3593@linux.vnet.ibm.com> <20180711164952.GA29994@linux.vnet.ibm.com> <9ee4d6fd-02e2-2c73-36a7-36ef4f6413b0@de.ibm.com> <20180711201759.GB3593@linux.vnet.ibm.com> <1531340384.8759.86.camel@infradead.org> <20180711210828.GD3593@linux.vnet.ibm.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-MMD/6LSnZj1kTWtQSDpD" Date: Thu, 12 Jul 2018 13:00:42 +0100 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-MMD/6LSnZj1kTWtQSDpD Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2018-07-11 at 14:08 -0700, Paul E. McKenney wrote: >=20 > > Also... why in $DEITY's name was the existing > > rcu_virt_note_context_switch() not actually sufficient? If we had that > > there, why did we need an additional explicit calls to rcu_all_qs() in > > the KVM loop, or the more complex fixes to need_resched() which > > ultimately had the same effect, to avoid ten-second latencies? >=20 > My guess is that this was because control passed through the > rcu_virt_note_context_switch() only once, and then subsequent > scheduling-clock interrupts bypassed this code.=C2=A0 But that is just a = guess. > I need to defer to someone who understands the KVM code better than I do. I think it's more likely that we just never happened at all. It's conditional. From the latest patch iteration (see it being removed): @@ -118,12 +118,12 @@ static inline void guest_enter_irqoff(void) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0* one time slice). Le= ts treat guest mode as quiescent state, just like =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0* we do with user-mod= e execution. =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0*/ -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (!context_tracking_cpu_is_ena= bled()) -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0rcu_virt_note_context_switch(smp_processor_id()); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0rcu_kvm_enter(); =C2=A0} Given the vmexit overhead, I don't think we can do the currently- proposed rcu_kvm_enter() thing except for CONFIG_NO_HZ_FULL where it's really necessary. I'll make that conditional, but probably on the RCU side. Without CONFIG_NO_HZ_FULL, rcu_kvm_exit() can do nothing, and rcu_kvm_enter() can do rcu_virt_note_context_switch(). 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