linux-kernel - Re: [RFC PATCH 3/4] sched/fair: Calculate the scan depth for idle balance based on system utilization

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Message-ID: <20230621112027.GB2053369@hirez.programming.kicks-ass.net>
Date:   Wed, 21 Jun 2023 13:20:27 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Gautham R. Shenoy" <gautham.shenoy@....com>
Cc:     Chen Yu <yu.c.chen@...el.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Tim Chen <tim.c.chen@...el.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Abel Wu <wuyun.abel@...edance.com>,
        Len Brown <len.brown@...el.com>,
        Chen Yu <yu.chen.surf@...il.com>,
        Yicong Yang <yangyicong@...ilicon.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/4] sched/fair: Calculate the scan depth for idle
 balance based on system utilization

On Thu, Jun 15, 2023 at 11:31:07AM +0530, Gautham R. Shenoy wrote:

> Is there any particular reason why this is being limited only to the
> LLC domain ?

Yeah, agreed, this should be uniform across the domains below NUMA.
Above that we already have SD_SERIALIZE anyway -- and the interval is
fairly high.