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 913D3ECDFBB for ; Wed, 18 Jul 2018 19:44:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 304072084E for ; Wed, 18 Jul 2018 19:44:11 +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="mZz8tMVl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 304072084E 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 S1729974AbeGRUW3 (ORCPT ); Wed, 18 Jul 2018 16:22:29 -0400 Received: from twosheds.infradead.org ([90.155.92.209]:39588 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726633AbeGRUW2 (ORCPT ); Wed, 18 Jul 2018 16:22:28 -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=7mXLcHEvxVKPwSf+qxnzujv6CDAExPZ5vAl0WPsUmug=; b=mZz8tMVljUTBi7MELT10EyEve lekGPxD2pU2DR+liPwo14iIMmjlyY8pEQPK91HQEBjZkJgsaU4ghz418+3R7KmChnXkUsQxewsV9s ZVRNfEexN3XxWY0LQOP0CMVKtSlQXW+3s5F9mpaGqJEKgZ1Co0sXaCtToB96sm/0YYmyItlA4Ifoj brzqe1ykrf5ix+rY4H0jNPLY9Aa/rDmmFDPdpOe2NWqPqQazu99ZAsDNLeEtMiEOMm2f0SzhGX275 3utANE5A0X6Z2BFxht77Rdxdb8e/1SV3ozz0zlvItT9ZpHSTSTIwK9Jojw2DYYs45e2U/wZx4HSGA VymhYJPTw==; Received: from [54.239.6.185] (helo=vpn-10-85-97-114.fra54.corp.amazon.com) by twosheds.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1ffsLl-001nQo-KE; Wed, 18 Jul 2018 19:43:02 +0000 Message-ID: <1531942865.3414.35.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: <20180718163712.GB12945@linux.vnet.ibm.com> References: <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> <1531815548.19223.23.camel@infradead.org> <20180717125653.GH12945@linux.vnet.ibm.com> <20180718153628.GA24359@linux.vnet.ibm.com> <1531929711.3414.29.camel@infradead.org> <20180718163712.GB12945@linux.vnet.ibm.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-SoUW9WE2FHcFsQ6+2KNn" Date: Wed, 18 Jul 2018 21:41:05 +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 --=-SoUW9WE2FHcFsQ6+2KNn Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2018-07-18 at 09:37 -0700, Paul E. McKenney wrote: > On Wed, Jul 18, 2018 at 06:01:51PM +0200, David Woodhouse wrote: > >=20 > > On Wed, 2018-07-18 at 08:36 -0700, Paul E. McKenney wrote: > > >=20 > > > And I finally did get some near misses from an earlier commit, so we > > > should consider your patch to be officially off the hook. > > > > Yay, I like it when it's not my fault. I'll redo it with the ifdef > > CONFIG_NO_HZ_FULL. > > Hey, I didn't say it wasn't your fault, only that it -officially- wasn't > your fault.=C2=A0=C2=A0;-) I can live with being innocent until proven guilty. > >=20 > > What should it do for the !CONFIG_NO_HZ_FULL case? The existing call in > > guest_enter_irqoff() clearly wasn't actually doing the right thing > > anyway, hence the need for the need_resched() patch in $SUBJECT... so > > should I just leave it doing nothing in guest_enter_irqoff()?=C2=A0 > > One starting point would be the combination of your patch and my > patch, with -rcu commit IDs and diff below.=C2=A0=C2=A0But yes, it needs = to be > !CONFIG_NO_HZ_FULL.=C2=A0=C2=A0And no, I am not at all confident that I a= ctually > found all the places needing change in the core code, so this needs some > serious review both by the KVM guys and the NO_HZ_FULL guys. Right, that looks fairly much like the version I'd ended up with. So my question was... > --- a/include/linux/context_tracking.h > +++ b/include/linux/context_tracking.h > @@ -118,12 +118,12 @@ static inline void guest_enter_irqoff(void) > =C2=A0 =C2=A0* one time slice). Lets treat guest mode as quiescent state,= just like > =C2=A0 =C2=A0* we do with user-mode execution. > =C2=A0 =C2=A0*/ ...if we change this to something like... #ifdef CONFIG_NO_HZ_FULL > + rcu_kvm_enter(); #else > if (!context_tracking_cpu_is_enabled()) > rcu_virt_note_context_switch(smp_processor_id()); #endif ... do you actually want me to keep the #else case there? It blatantly wasn't working anyway for us, perhaps because the condition was false? That's why I started fixing need_resched() in the first place, and that fix ought to cover whatever this call to rcu_virt_note_context_switch() was supposed to be doing? --=-SoUW9WE2FHcFsQ6+2KNn 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 hETscxI/Hj6UZ4a7sHm5BkVjlsB1Af2Za/PXUt8MmLAcPMHkMPGunvkUibEvblDvpqMkQZlaZM+t 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