Re: [Qemu-devel] [PATCH 7/9] pc: acpi: drop not needed intermediate bitmap cpu->found_cpus

[Igor Mammedov <imammedo@redhat.com>]

On Thu, 11 Feb 2016 13:59:33 -0200
Eduardo Habkost <ehabkost@redhat.com> wrote:

> On Fri, Feb 05, 2016 at 05:44:49PM +0100, Igor Mammedov wrote:
> > On Fri, 5 Feb 2016 17:19:50 +0100
> > Igor Mammedov <imammedo@redhat.com> wrote:
> >   
> > > On Fri, 5 Feb 2016 13:39:07 -0200
> > > Eduardo Habkost <ehabkost@redhat.com> 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 <imammedo@redhat.com>      
> > > > 
> > > > 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.  
> 
> What about pc_possible_cpu_arch_ids() itself? It has exactly the
> same problem: it looks at CPU objects smp_cpus*max_cpus times, to
> fill the CPUArchId.cpu field. If that's a problem for
> build_processor_devices(), I assume that's a problem for all
> other possible_cpu_arch_ids() callers?
pls see v2
https://www.mail-archive.com/qemu-devel@nongnu.org/msg351298.html