linux-kernel - Re: [RFC PATCH v4 3/3] scheduler: Add cluster scheduler level for x86

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Date:   Tue, 2 Mar 2021 11:30:43 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Barry Song <song.bao.hua@...ilicon.com>
Cc:     tim.c.chen@...ux.intel.com, catalin.marinas@....com,
        will@...nel.org, rjw@...ysocki.net, vincent.guittot@...aro.org,
        bp@...en8.de, tglx@...utronix.de, mingo@...hat.com,
        lenb@...nel.org, dietmar.eggemann@....com, rostedt@...dmis.org,
        bsegall@...gle.com, mgorman@...e.de, msys.mizuma@...il.com,
        valentin.schneider@....com, gregkh@...uxfoundation.org,
        jonathan.cameron@...wei.com, juri.lelli@...hat.com,
        mark.rutland@....com, sudeep.holla@....com,
        aubrey.li@...ux.intel.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        x86@...nel.org, xuwei5@...wei.com, prime.zeng@...ilicon.com,
        guodong.xu@...aro.org, yangyicong@...wei.com,
        liguozhu@...ilicon.com, linuxarm@...neuler.org, hpa@...or.com
Subject: Re: [RFC PATCH v4 3/3] scheduler: Add cluster scheduler level for x86

On Tue, Mar 02, 2021 at 11:59:40AM +1300, Barry Song wrote:
> From: Tim Chen <tim.c.chen@...ux.intel.com>
> 
> There are x86 CPU architectures (e.g. Jacobsville) where L2 cahce
> is shared among a cluster of cores instead of being exclusive
> to one single core.

Isn't that most atoms one way or another? Tremont seems to have it per 4
cores, but earlier it was per 2 cores.