linux-kernel - Re: [PATCH v3] topology: make core_mask include at least cluster

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Date:   Mon, 14 Mar 2022 09:56:24 -0700
From:   Darren Hart <darren@...amperecomputing.com>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        Will Deacon <will@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Arm <linux-arm-kernel@...ts.infradead.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Catalin Marinas <Catalin.Marinas@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Barry Song <song.bao.hua@...ilicon.com>,
        Valentin Schneider <Valentin.Schneider@....com>,
        "D . Scott Phillips" <scott@...amperecomputing.com>,
        Ilkka Koskinen <ilkka@...amperecomputing.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v3] topology: make core_mask include at least
 cluster_siblings

On Mon, Mar 14, 2022 at 10:37:21AM +0100, Dietmar Eggemann wrote:
> On 09/03/2022 19:26, Darren Hart wrote:
> > On Wed, Mar 09, 2022 at 01:50:07PM +0100, Dietmar Eggemann wrote:
> >> On 08/03/2022 18:49, Darren Hart wrote:
> >>> On Tue, Mar 08, 2022 at 05:03:07PM +0100, Dietmar Eggemann wrote:
> >>>> On 08/03/2022 12:04, Vincent Guittot wrote:
> >>>>> On Tue, 8 Mar 2022 at 11:30, Will Deacon <will@...nel.org> wrote:
> >>
> >> [...]
> >>
> >>>> IMHO, if core_mask weight is 1, MC will be removed/degenerated anyway.
> >>>>
> >>>> This is what I get on my Ampere Altra (I guess I don't have the ACPI
> >>>> changes which would let to a CLS sched domain):
> >>>>
> >>>> # cat /sys/kernel/debug/sched/domains/cpu0/domain*/name
> >>>> DIE
> >>>> NUMA
> >>>> root@...-altra01:~# zcat /proc/config.gz | grep SCHED_CLUSTER
> >>>> CONFIG_SCHED_CLUSTER=y
> >>>
> >>> I'd like to follow up on this. Would you share your dmidecode BIOS
> >>> Information section?
> >>
> >> # dmidecode -t 0
> >> # dmidecode 3.2
> >> Getting SMBIOS data from sysfs.
> >> SMBIOS 3.2.0 present.
> >>
> >> Handle 0x0000, DMI type 0, 26 bytes
> >> BIOS Information
> >> 	Vendor: Ampere(TM)
> >> 	Version: 0.9.20200724
> >> 	Release Date: 2020/07/24
> >> 	ROM Size: 7680 kB
> >> 	Characteristics:
> >> 		PCI is supported
> >> 		BIOS is upgradeable
> >> 		Boot from CD is supported
> >> 		Selectable boot is supported
> >> 		ACPI is supported
> >> 		UEFI is supported
> >> 	BIOS Revision: 5.15
> >> 	Firmware Revision: 0.6
> >>
> > 
> > Thank you, I'm following internally and will get with you.
> 
> Looks like in my PPTT, the `Processor Hierarchy Nodes` which represents
> cluster nodes have no valid `ACPI Processor ID`.

Thanks, I'm looking for the right person to get us the latest information
available this. Will follow up once I have.

-- 
Darren Hart
Ampere Computing / OS and Kernel