Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9BCB7C636D3 for ; Fri, 10 Feb 2023 09:04:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231810AbjBJJEU (ORCPT ); Fri, 10 Feb 2023 04:04:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59776 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231786AbjBJJEA (ORCPT ); Fri, 10 Feb 2023 04:04:00 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 89B016E547; Fri, 10 Feb 2023 01:02:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=qPTq/LqnXV42BTUz+yTlfw4ulY4WgnJd6TzDahbZJ7k=; b=fp0c/opz8ZvY2H4ANOrIyh+vfH GNeaXNOO09goEdxylVRN5vZwzljcYgO3Qm1I3sIT43S3cK8LsRrx/yfiVKp5lvQo/kFtZzKH5em2X NrJ1hLrgRGFYqoJsELBCfUwTJu1Fxgxw6s4RX1zgX9pSuqrmTIBCw4HgEEaE6uJ/Z8hUDkyCIzqlH 9lA7fWlrbRKYd6e7a8NNd8+oaqJaJaRUvYKITTf73kbG5I3GHSJIbYBb0/6bywfkVN02qhyHXB9xj KVSBDzGcrgobBR9wWCZuZx5E4HIIUTRPzqxIvRQdoTlRHi9Qo4JMlHRJn0ZD2I4L4BBT8we9vIbYU jqIDqWkA==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pQPIF-002yAJ-W4; Fri, 10 Feb 2023 09:02:08 +0000 Message-ID: <316d19f15ad98459df920e3bb2657f183c88d647.camel@infradead.org> Subject: Re: [PATCH v8 0/9] Parallel CPU bringup for x86_64 From: David Woodhouse To: paulmck@kernel.org, Usama Arif Cc: tglx@linutronix.de, kim.phillips@amd.com, arjan@linux.intel.com, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com, thomas.lendacky@amd.com, seanjc@google.com, pmenzel@molgen.mpg.de, fam.zheng@bytedance.com, punit.agrawal@bytedance.com, simon.evans@bytedance.com, liangma@liangbit.com Date: Fri, 10 Feb 2023 09:02:06 +0000 In-Reply-To: <20230210041103.GO2948950@paulmck-ThinkPad-P17-Gen-1> References: <20230209154156.266385-1-usama.arif@bytedance.com> <20230210041103.GO2948950@paulmck-ThinkPad-P17-Gen-1> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-de04AGYU3ZL51WF9vLPC" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-de04AGYU3ZL51WF9vLPC Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2023-02-09 at 20:11 -0800, Paul E. McKenney wrote: > On Thu, Feb 09, 2023 at 03:41:47PM +0000, Usama Arif wrote: > > The major change over v7 is fixing CPU0 hotplug not working as reported= by > > Paul E. McKenney using rcu torture tests. This is fixed by setting up t= he > > initial_gs, initial_stack and early_gdt_descr properly for this case. > >=20 > > The improvement in boot time is the same as v7. >=20 > This one passes moderate rcutorture testing. 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