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

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To: "Song Bao Hua (Barry Song)" <song.bao.hua@xxxxxxxxxxxxx>, Dietmar Eggemann <dietmar.eggemann@xxxxxxx>, Morten Rasmussen <morten.rasmussen@xxxxxxx>
Subject: Re: [RFC PATCH v3 0/2] scheduler: expose the topology of clusters and add cluster scheduler
From: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Date: Tue, 13 Apr 2021 12:00:27 -0700
Cc: "valentin.schneider@xxxxxxx" <valentin.schneider@xxxxxxx>, "catalin.marinas@xxxxxxx" <catalin.marinas@xxxxxxx>, "will@xxxxxxxxxx" <will@xxxxxxxxxx>, "rjw@xxxxxxxxxxxxx" <rjw@xxxxxxxxxxxxx>, "vincent.guittot@xxxxxxxxxx" <vincent.guittot@xxxxxxxxxx>, "lenb@xxxxxxxxxx" <lenb@xxxxxxxxxx>, "gregkh@xxxxxxxxxxxxxxxxxxx" <gregkh@xxxxxxxxxxxxxxxxxxx>, Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "peterz@xxxxxxxxxxxxx" <peterz@xxxxxxxxxxxxx>, "juri.lelli@xxxxxxxxxx" <juri.lelli@xxxxxxxxxx>, "rostedt@xxxxxxxxxxx" <rostedt@xxxxxxxxxxx>, "bsegall@xxxxxxxxxx" <bsegall@xxxxxxxxxx>, "mgorman@xxxxxxx" <mgorman@xxxxxxx>, "mark.rutland@xxxxxxx" <mark.rutland@xxxxxxx>, "sudeep.holla@xxxxxxx" <sudeep.holla@xxxxxxx>, "aubrey.li@xxxxxxxxxxxxxxx" <aubrey.li@xxxxxxxxxxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-acpi@xxxxxxxxxxxxxxx" <linux-acpi@xxxxxxxxxxxxxxx>, "linuxarm@xxxxxxxxxxxxx" <linuxarm@xxxxxxxxxxxxx>, "xuwei (O)" <xuwei5@xxxxxxxxxx>, "Zengtao (B)" <prime.zeng@xxxxxxxxxxxxx>, "tiantao (H)" <tiantao6@xxxxxxxxxxxxx>, Guodong Xu <guodong.xu@xxxxxxxxxx>, yangyicong <yangyicong@xxxxxxxxxx>
In-reply-to: <9201b56a29dd4dacb7d9fcbf307ca5ff@hisilicon.com>
References: <20210106083026.40444-1-song.bao.hua@hisilicon.com> <737932c9-846a-0a6b-08b8-e2d2d95b67ce@linux.intel.com> <20210108151241.GA47324@e123083-lin> <99c07bdf-02d1-153a-bd1e-2f4200cc67c5@linux.intel.com> <20210111092811.GB47324@e123083-lin> <4fdc781e-7385-2ae6-d9c9-3ec165f473c4@arm.com> <9201b56a29dd4dacb7d9fcbf307ca5ff@hisilicon.com>
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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

References:
- [RFC PATCH v3 0/2] scheduler: expose the topology of clusters and add cluster scheduler
  - From: Barry Song
- Re: [RFC PATCH v3 0/2] scheduler: expose the topology of clusters and add cluster scheduler
  - From: Tim Chen
- Re: [RFC PATCH v3 0/2] scheduler: expose the topology of clusters and add cluster scheduler
  - From: Morten Rasmussen
- Re: [RFC PATCH v3 0/2] scheduler: expose the topology of clusters and add cluster scheduler
  - From: Tim Chen
- Re: [RFC PATCH v3 0/2] scheduler: expose the topology of clusters and add cluster scheduler
  - From: Morten Rasmussen
- Re: [RFC PATCH v3 0/2] scheduler: expose the topology of clusters and add cluster scheduler
  - From: Dietmar Eggemann
- RE: [RFC PATCH v3 0/2] scheduler: expose the topology of clusters and add cluster scheduler
  - From: Song Bao Hua (Barry Song)

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