linux-kernel - Re: [PATCH v2 06/10] powerpc/smp: Generalize 2nd sched domain

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Message-ID: <20200722074624.GP119549@hirez.programming.kicks-ass.net>
Date:   Wed, 22 Jul 2020 09:46:24 +0200
From:   peterz@...radead.org
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:     Michael Ellerman <michaele@....ibm.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Nick Piggin <npiggin@....ibm.com>,
        Oliver OHalloran <oliveroh@....ibm.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        Michael Neuling <mikey@...ux.ibm.com>,
        Anton Blanchard <anton@....ibm.com>,
        Gautham R Shenoy <ego@...ux.vnet.ibm.com>,
        Vaidyanathan Srinivasan <svaidy@...ux.ibm.com>,
        Jordan Niethe <jniethe5@...il.com>
Subject: Re: [PATCH v2 06/10] powerpc/smp: Generalize 2nd sched domain

On Tue, Jul 21, 2020 at 05:08:10PM +0530, Srikar Dronamraju wrote:
> Currently "CACHE" domain happens to be the 2nd sched domain as per
> powerpc_topology. This domain will collapse if cpumask of l2-cache is
> same as SMT domain. However we could generalize this domain such that it
> could mean either be a "CACHE" domain or a "BIGCORE" domain.

What's the whole smallcore vs bigcore thing?

Would it make sense to have an actual overview of the various topology
layers somewhere? Because I'm getting lost and can't really make sense
of the code due to that.