linux-kernel - Re: [PATCH V2] arm64: add SCHED

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Message-ID: <20220425100635.ig4dxvlflglfagpx@bogus>
Date:   Mon, 25 Apr 2022 11:06:35 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Qing Wang <wangqing@...o.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Sudeep Holla <sudeep.holla@....com>,
        linux-kernel@...r.kernel.org, vincent.guittot@...aro.org,
        peterz@...radead.org, dietmar.eggemann@....com
Subject: Re: [PATCH V2] arm64: add SCHED_CLUSTER's dependency on ACPI

On Sun, Apr 24, 2022 at 07:55:01PM -0700, Qing Wang wrote:
> From: Wang Qing <wangqing@...o.com>
> 
> cluster sched_domain configured by cpu_topology[].cluster_sibling, 
> which is set by cluster_id, cluster_id can only get from ACPI.
> 
> If the system does not enable ACPI, cluster_id is always -1, even enable
> SCHED_CLUSTER is invalid, this is misleading. 
> 
> So we add SCHED_CLUSTER's dependency on ACPI here.
>

Any reason why this can't be extended to support DT based systems via
cpu-map in the device tree. IMO we almost have everything w.r.t topology
in DT and no reason to deviate this feature between ACPI and DT.

-- 
Regards,
Sudeep