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 81221ECDFB3 for ; Tue, 17 Jul 2018 08:19:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1175F20862 for ; Tue, 17 Jul 2018 08:19:27 +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="uk0ehYht" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1175F20862 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 S1729718AbeGQIut (ORCPT ); Tue, 17 Jul 2018 04:50:49 -0400 Received: from twosheds.infradead.org ([90.155.92.209]:49266 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728067AbeGQIut (ORCPT ); Tue, 17 Jul 2018 04:50:49 -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=3TaDpCfjsF7vGlXk/prDN9a1e0QKlHJljMPHJg05rHA=; b=uk0ehYht5PQ8C97swkvJGiGt8 KPlHidwS1HXZyzNK2Y6gsEZ/gJzmRTNm1uAGpvPKCIDe/n/nF/3CZ4kogqAUv4LhIJwrb2uNrUML8 Dm8ttq0qO+k6WNEvaj/l5o4o7ww0UZMzXuSaRifMS+xshtQMtv6oteZLaQaUmDp21jXE5PPnSoJKE 0Ns8uvq2CUspvO9+kz4dri153yEGCSrjMRzbaHyzGBNn9vC8piAZtxaPXTdVbRPMtyjEc3XQwZusJ B8BGDeer/R6mdevx02A4r8J+W+fF/GJDOdDSpgk1cqunJkaDWo5cgSllmpeZn9ohJacPCrooDPckN yL4/dImnQ==; Received: from [54.239.6.185] (helo=uc8d3ff76b9bc5848a9cc.drs10.amazon.com) by twosheds.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1ffLCZ-0017wd-5M; Tue, 17 Jul 2018 08:19:19 +0000 Message-ID: <1531815548.19223.23.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: <20180716154015.GA21419@linux.vnet.ibm.com> References: <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> <1531396842.8759.125.camel@infradead.org> <20180712125351.GP3593@linux.vnet.ibm.com> <20180712161704.GA20726@linux.vnet.ibm.com> <20180716154015.GA21419@linux.vnet.ibm.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-P55jpeUI2TAQBVf8txhx" Date: Tue, 17 Jul 2018 10:19:08 +0200 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 --=-P55jpeUI2TAQBVf8txhx Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2018-07-16 at 08:40 -0700, Paul E. McKenney wrote: > Most of the weekend was devoted to testing today's upcoming pull request, > but I did get a bit more testing done on this. >=20 > I was able to make this happen more often by tweaking rcutorture a > bit, but I still do not yet have statistically significant results. > Nevertheless, I have thus far only seen failures with David's patch or > with both David's and my patch.=C2=A0=C2=A0And I actually got a full-up r= cutorture > failure (a too-short grace period) in addition to the aforementioned > close calls. >=20 > Over this coming week I expect to devote significant testing time to > the commit just prior to David's in my stack.=C2=A0=C2=A0If I don't see f= ailures > on that commit, we will need to spent some quality time with the KVM > folks on whether or not kvm_x86_ops->run() and friends have the option of > failing to return, but instead causing control to pop up somewhere else. > Or someone could tell me how I am being blind to some obvious bug in > the two commits that allow RCU to treat KVM guest-OS execution as an > extended quiescent state.=C2=A0=C2=A0;-) One thing we can try, if my patch is implicated, is moving the calls to rcu_kvm_en{ter,xit} closer to the actual VM entry. Let's try putting them around the large asm block in arch/x86/kvm/vmx.c::vmx_vcpu_run() for example. If that fixes it, then we know we've missed something else interesting that's happening in the middle. Testing on Skylake shows a guest CPUID goes from ~3000 cycles to ~3500 with this patch, so in the next iteration it definitely needs to be ifdef CONFIG_NO_HZ_FULL anyway, because it's actually required there (AFAICT) and it's too expensive otherwise as Christian pointed out. --=-P55jpeUI2TAQBVf8txhx Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQDgzLNWa18DNpGUj/ZeH0Sgz53ESIbzdPw3OJeuNP6jZhxZojbyfxbM 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