linux-kernel - Re: [Patch v2 1/6] sched/fair: Determine active load balance for SMT sched groups

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Message-ID: <d5c4af97791e12a3431556fce1c9ec1de066c597.camel@linux.intel.com>
Date:   Mon, 12 Jun 2023 13:12:35 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Ricardo Neri <ricardo.neri@...el.com>,
        "Ravi V . Shankar" <ravi.v.shankar@...el.com>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Len Brown <len.brown@...el.com>, Mel Gorman <mgorman@...e.de>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Valentin Schneider <vschneid@...hat.com>,
        Ionela Voinescu <ionela.voinescu@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Shrikanth Hegde <sshegde@...ux.vnet.ibm.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        naveen.n.rao@...ux.vnet.ibm.com,
        Yicong Yang <yangyicong@...ilicon.com>,
        Barry Song <v-songbaohua@...o.com>,
        Chen Yu <yu.c.chen@...el.com>, Hillf Danton <hdanton@...a.com>
Subject: Re: [Patch v2 1/6] sched/fair: Determine active load balance for
 SMT sched groups

On Mon, 2023-06-12 at 13:16 +0200, Peter Zijlstra wrote:
> On Thu, Jun 08, 2023 at 03:32:27PM -0700, Tim Chen wrote:
> > @@ -10371,6 +10436,11 @@ static struct sched_group *find_busiest_group(struct lb_env *env)
> >  			 */
> >  			goto out_balanced;
> >  
> > +		if (busiest->group_type == group_smt_balance &&
> > +		    smt_vs_nonsmt_groups(sds.local, sds.busiest))
> > +			/* Let non SMT CPU pull from SMT CPU sharing with sibling */
> > +			goto force_balance;
> > +
> >  		if (busiest->group_weight > 1 &&
> >  		    local->idle_cpus <= (busiest->idle_cpus + 1))
> >  			/*
> 
> Could you please add {} for all of them? The comment makes them all
> multi-line.

Will do.

Tim