linux-kernel - Re: [RFC PATCH v3 0/2] scheduler: expose the topology of clusters and add cluster scheduler

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Date:   Tue, 13 Apr 2021 12:00:27 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>
Cc:     "valentin.schneider@....com" <valentin.schneider@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "juri.lelli@...hat.com" <juri.lelli@...hat.com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "bsegall@...gle.com" <bsegall@...gle.com>,
        "mgorman@...e.de" <mgorman@...e.de>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "sudeep.holla@....com" <sudeep.holla@....com>,
        "aubrey.li@...ux.intel.com" <aubrey.li@...ux.intel.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linuxarm@...neuler.org" <linuxarm@...neuler.org>,
        "xuwei (O)" <xuwei5@...wei.com>,
        "Zengtao (B)" <prime.zeng@...ilicon.com>,
        "tiantao (H)" <tiantao6@...ilicon.com>,
        Guodong Xu <guodong.xu@...aro.org>,
        yangyicong <yangyicong@...wei.com>
Subject: Re: [RFC PATCH v3 0/2] scheduler: expose the topology of clusters and
 add cluster scheduler



On 4/13/21 3:45 AM, Song Bao Hua (Barry Song) wrote:
> 
> 
>
> Right now in the main cases of using wake_affine to achieve
> better performance, processes are actually bound within one
> numa which is also a LLC in kunpeng920. 
> 
> Probably LLC=NUMA is also true for X86 Jacobsville, Tim?

In general for x86, LLC is partitioned at the sub-numa cluster level.  
LLC could be divided between sub-numa cluster within a NUMA node.
That said, for Jacobsville, we don't have sub-numa clusters
so LLC=NUMA is true for that platform. 

Tim