linux-kernel - Re: [patch V3 23/40] x86/cpu: Provide cpu_init/parse

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Date:   Mon, 14 Aug 2023 07:11:37 +0000
From:   "Zhang, Rui" <rui.zhang@...el.com>
To:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Brown, Len" <len.brown@...el.com>,
        "Gross, Jurgen" <jgross@...e.com>,
        "mikelley@...rosoft.com" <mikelley@...rosoft.com>,
        "arjan@...ux.intel.com" <arjan@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "ray.huang@....com" <ray.huang@....com>,
        "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>,
        "Sivanich, Dimitri" <dimitri.sivanich@....com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "Luck, Tony" <tony.luck@...el.com>
Subject: Re: [patch V3 23/40] x86/cpu: Provide cpu_init/parse_topology()

On Mon, 2023-08-14 at 08:26 +0200, Thomas Gleixner wrote:
> On Sat, Aug 12 2023 at 08:00, Rui Zhang wrote:
> > On Sat, 2023-08-12 at 14:38 +0800, Zhang Rui wrote:
> > BTW, can we consider using system wide unique core_id instead?
> > 
> > There are a couple of advantages by using this.
> > CC Len, who can provide detailed justifications for this.
> 
> I have no problem with that. But as I said before we need a
> discussion
> about the ID representation in general so it becomes a consistent
> view
> at all levels.

Agreed.
And I think Len will be back online and propose something soon and we
can start with that. :)

> 
> The other thing to think about is whether we really need all these
> IDs
> explicitly stored in cpu_info::topo... The vast majority of usage
> sites
> is in some slow path (setup, cpu hotplug, proc, sysfs ...).
> 

I don't have a strong preference here. With the new framework, this
info is really handy even if we don't cache it somewhere.

thanks,
rui