linux-kernel - Re: [PATCH v5 1/5] sched/fair: Ignore SIS

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Date:   Wed, 14 Sep 2022 14:58:44 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Abel Wu <wuyun.abel@...edance.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mel Gorman <mgorman@...e.de>,
        Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Josh Don <joshdon@...gle.com>, Chen Yu <yu.c.chen@...el.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        "Gautham R . Shenoy" <gautham.shenoy@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/5] sched/fair: Ignore SIS_UTIL when has idle core

On Fri, 2022-09-09 at 13:53 +0800, Abel Wu wrote:
> When SIS_UTIL is enabled, SIS domain scan will be skipped if the
> LLC is overloaded even the has_idle_core hint is true. Since idle
> load balancing is triggered at tick boundary, the idle cores can
> stay cold for the whole tick period wasting time meanwhile some
> of other cpus might be overloaded.
> 
> Give it a chance to scan for idle cores if the hint implies a
> worthy effort.

Reviewed-by: Tim Chen <tim.c.chen@...ux.intel.com>
>