From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45476) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRjV9-0007KS-Vq for qemu-devel@nongnu.org; Fri, 05 Feb 2016 11:44:59 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aRjV6-0004tL-Oa for qemu-devel@nongnu.org; Fri, 05 Feb 2016 11:44:55 -0500 Received: from mx1.redhat.com ([209.132.183.28]:34032) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRjV6-0004tB-Ix for qemu-devel@nongnu.org; Fri, 05 Feb 2016 11:44:52 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (Postfix) with ESMTPS id 1F4FF3F3BD for ; Fri, 5 Feb 2016 16:44:52 +0000 (UTC) Date: Fri, 5 Feb 2016 17:44:49 +0100 From: Igor Mammedov Message-ID: <20160205174449.4dd18057@nial.brq.redhat.com> In-Reply-To: <20160205171950.4bf5ea3a@nial.brq.redhat.com> References: <1454586455-10202-1-git-send-email-imammedo@redhat.com> <1454586455-10202-7-git-send-email-imammedo@redhat.com> <20160205153907.GS26314@thinpad.lan.raisama.net> <20160205171950.4bf5ea3a@nial.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 7/9] pc: acpi: drop not needed intermediate bitmap cpu->found_cpus List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Eduardo Habkost Cc: pbonzini@redhat.com, qemu-devel@nongnu.org, mst@redhat.com On Fri, 5 Feb 2016 17:19:50 +0100 Igor Mammedov wrote: > On Fri, 5 Feb 2016 13:39:07 -0200 > Eduardo Habkost wrote: > > > On Thu, Feb 04, 2016 at 12:47:33PM +0100, Igor Mammedov wrote: > > > cpu->found_cpus bitmap is used for setting present > > > flag in CPON AML package at start up. But it takes > > > a bunch of code to fill bitmap and cloud be simplified > > > by calling qemu_get_cpu_by_arch_id(apic_id) directly. > > > > > > Hence do so and remove not used anymore bitmap > > > with related utilities, which saves us ~32LOC > > > and also would simplify consolidating APCI parts > > > of CPU hotplug. > > > > > > Signed-off-by: Igor Mammedov > > > > This makes the code loops through all smp_cpus CPUs max_cpus > > times, instead of just looping through the smp_cpus CPUs once. > Yep, that looks bad. > I'll redo it using possible_cpu_arch_ids(), it is a little > bit bigger refactoring. I think I'll make bitmap local to build_processor_devices() as it's needed only for building CPON package, that way it will go along with related legacy hotplug and won't get in the way of new hotplug. > > > > > I'm all for making the code simpler, and there's an upper bound: > > looking at CPU objects 64k times (because MAX_CPUMASK_BITS is > > 255). But I want to make sure we agree this is an optimization we > > want to drop. > > > >