linux-kernel - Re: [RFCv2 6/6] sched/fair: Bound non idle core search by DIE domain

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Message-ID: <20190515164414.GY2589@hirez.programming.kicks-ass.net>
Date:   Wed, 15 May 2019 18:44:14 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Parth Shah <parth@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        mingo@...hat.com, dietmar.eggemann@....com, dsmythies@...us.net
Subject: Re: [RFCv2 6/6] sched/fair: Bound non idle core search by DIE domain

On Wed, May 15, 2019 at 07:23:22PM +0530, Parth Shah wrote:
> This patch specifies the sched domain to search for a non idle core.
> 
> The select_non_idle_core searches for the non idle cores across whole
> system. But in the systems with multiple NUMA domains, the Turbo frequency
> can be sustained within the NUMA domain without being affected from other
> NUMA.
> 
> This patch provides an architecture specific implementation for defining
> the turbo domain to make searching of the core to be bound within the NUMA.

NAK, this is insane. You don't need arch hooks to find the numa domain.