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 27F44C468C6 for ; Thu, 19 Jul 2018 07:36:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C3552206B7 for ; Thu, 19 Jul 2018 07:36:16 +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="Ndv2o7Nj" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C3552206B7 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 S1731402AbeGSISB (ORCPT ); Thu, 19 Jul 2018 04:18:01 -0400 Received: from twosheds.infradead.org ([90.155.92.209]:54496 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727288AbeGSIR7 (ORCPT ); Thu, 19 Jul 2018 04:17:59 -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=taB8ixhDfDhC3LeJZd4osUG0hboYP7Pg0Af1/M2mJj8=; b=Ndv2o7NjJ+MXLWcTta02KH5Xn 4mSaa+BH3TGQcTO51YkH6hIke8tVYqe34JAO44bBUdKlXRiyPMyIMyIfQVdDNf5X1yV3/xp5hB34b L2XlJIOvCJYXd+JPd0N6pDYJqZOW/gd8jmhaagGxaqAKFgeVwxJh7YvRjLD2Q0Whjm3WsrlQEnb/d ch3LuvAZ8aUXkSCx103SFwgJypEvOXjXNIHDx+bcGfeJORF/rQhRTS9WW+/Y0o8TsVkQfpNp/NNvO heq5+3BF5Aoz4j26NYI06xDhzy0H/CjiHjeDh+Q4JgqHdr8k18o0ksLH/v4kbgFZ42rQx0qGuH48X jzge+rxrg==; Received: from [54.239.6.185] (helo=uc8d3ff76b9bc5848a9cc.ant.amazon.com) by twosheds.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fg3Ts-001zWD-Pd; Thu, 19 Jul 2018 07:36:08 +0000 Message-ID: <1531984833.12620.16.camel@infradead.org> Subject: Re: [RFC] Make need_resched() return true when rcu_urgent_qs requested From: David Woodhouse To: Christian Borntraeger , paulmck@linux.vnet.ibm.com Cc: Peter Zijlstra , mhillenb@amazon.de, linux-kernel , kvm , Frederic Weisbecker In-Reply-To: <86d12d1a-46dd-d82a-96c2-e842ac5a2a6c@de.ibm.com> References: <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> <1531942865.3414.35.camel@infradead.org> <20180718201700.GN12945@linux.vnet.ibm.com> <86d12d1a-46dd-d82a-96c2-e842ac5a2a6c@de.ibm.com> Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAAG1BMVEUHBwcUFBQpKSlGRkZhYWF9fX2Xl5eysrLMzMxFF+rXAAACaElEQVQ4y21UQXbbIBQE9wJALmAg6ToWON22FrhZthHgbvssUPathC7QWMful2JHSmtWwGg+zPxBCE0DU4QoJQgRgsg4w2gJjBNE8PjFBZgnQMBs+uZ1NQNQjZO3BV4AGDFC0f+l4DBG0VUAM4yv7SO8IgRdHXQ+A78HKL5OAeCfNQV5cHX8DsBUyIJKtYbt98BKaGNCKjfgFVkqYVLbkHKsRsbSCSa0T6npIqLrpRBgQKHUpQmgs9eEKaiUcooE8WWfCGVnBiUcn1uF2XhbfmN9apKnmMP2K4kizKkQWxuaVNOpU2cACIyxO1Po8ETHcXEDMVnozcejkAYA9iaD4pU0ZvNQ8VurNnTuFAYVtuIPUZW25PjDIjQAlGyffIiRQxoWAZBmJ0LTdW2Nyc0iP3DqRhxizvGJkBWZmyFVyZkddWzmBoIBVMpCCJ1CFzl98xav4VJKSSD45KbUT75ixikTphDSRh8+Uz7JLgUTAgAFwzqzjxc/nDY7WUApqY0OMdTwCKZSXplSKkgIRCHElCp8ZnhnKqXuwcNbk1L0VXE+I9alUXoHlLHl3mv7/dWQlJwtjREC7mu9L/U2jQyMUuO2EDS4q9Kl2ddm232bxIE5pjJuVwiljNn/Cfv25/T0cu5cZbwHGVq7h/zp0B4n3S99V/utD+Uo8BiGx9xCsOAV5z7/tjo4Z4z1Lvb90KZ7eFOoOeXOukqF2seo234YYuaQPpRP+cVZU5adT1Edun5Iz3z8fTz3+eSDh0Ip1c7zx1MaijGzTd/3MbRuBHz8cvcVgCMBRpOHvgu59WDhoat+nIZm+LWm9C/aaaGq5DCP9QAAAABJRU5ErkJggg== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-Lw4VHMnSdxkBpk9JJ92r" Date: Thu, 19 Jul 2018 09:20:33 +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 --=-Lw4VHMnSdxkBpk9JJ92r Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-07-19 at 08:45 +0200, Christian Borntraeger wrote: >=20 > > My thought would be something like this: > >=C2=A0 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (context_tracking_cpu_is_en= abled()) > >=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_kvm_enter(); > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0else > >=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()); >=20 > In the past we needed that (when we introduced that). At least with every > host interrupt we called this making an rcu event at least every HZ. > Will the changes in need_resched make this part unnecessary? Yes, the change in need_resched() should make this part unnecessary. Unless your architecture's version of the vcpu_run() loop just loops forever even when TIF_NEED_RESCHED is set? :) I'm not sure about the context tracking condition in the code snippet cited above, though. I think that's what caused my problem in the first place =E2=80=94 I have CONTEXT_TRACKING_FORCE && !NO_HZ_FULL. So in 4.15, t= hat means rcu_user_enter() did nothing and rcu_virt_note_context_switch() wasn't called. Hence the observed stalls. Should rcu_user_enter() itself be conditional on CONTEXT_TRACKING not NO_HZ_FULL?=C2=A0 --=-Lw4VHMnSdxkBpk9JJ92r 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 5PqFmWkbehLaEvbpNY7dmEAAeKh4klTzJzrr5AAzaCQ32cA2e3+DEIv5O5l9ViMIjy/JM+xMQrfX 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