linux-kernel - Re: [PATCH v2 3/4] sched/fair: Consider SMT in ASYM

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Message-ID: <YI/IQ+LRD/YhgZoN@hirez.programming.kicks-ass.net>
Date:   Mon, 3 May 2021 11:54:11 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...nel.org>, Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.comi>, Mel Gorman <mgorman@...e.de>,
        Len Brown <len.brown@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ricardo Neri <ricardo.neri@...el.com>,
        Quentin Perret <qperret@...gle.com>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        linux-kernel@...r.kernel.org, Aubrey Li <aubrey.li@...el.com>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: Re: [PATCH v2 3/4] sched/fair: Consider SMT in ASYM_PACKING load
 balance

On Tue, Apr 13, 2021 at 07:04:35PM -0700, Ricardo Neri wrote:
> +/**
> + * asym_can_pull_tasks - Check whether the load balancing CPU can pull tasks
> + * @dst_cpu:	CPU doing the load balancing

FWIW, that description isn't correct. dst_cpu does not need to be the
CPU doing the actual balancing. It mostly is, but no guarantees.