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Message-ID: <d5c4af97791e12a3431556fce1c9ec1de066c597.camel@linux.intel.com>
Subject: Re: [Patch v2 1/6] sched/fair: Determine active load balance for
 SMT sched groups
From:   Tim Chen <tim.c.chen@linux.intel.com>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Juri Lelli <juri.lelli@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Ricardo Neri <ricardo.neri@intel.com>,
        "Ravi V . Shankar" <ravi.v.shankar@intel.com>,
        Ben Segall <bsegall@google.com>,
        Daniel Bristot de Oliveira <bristot@redhat.com>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Len Brown <len.brown@intel.com>, Mel Gorman <mgorman@suse.de>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Valentin Schneider <vschneid@redhat.com>,
        Ionela Voinescu <ionela.voinescu@arm.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org,
        Shrikanth Hegde <sshegde@linux.vnet.ibm.com>,
        Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
        naveen.n.rao@linux.vnet.ibm.com,
        Yicong Yang <yangyicong@hisilicon.com>,
        Barry Song <v-songbaohua@oppo.com>,
        Chen Yu <yu.c.chen@intel.com>, Hillf Danton <hdanton@sina.com>
Date:   Mon, 12 Jun 2023 13:12:35 -0700
In-Reply-To: <20230612111602.GJ4253@hirez.programming.kicks-ass.net>
References: <cover.1686263351.git.tim.c.chen@linux.intel.com>
         <253f5272200d3cec3f24427262bb4e95244f681c.1686263351.git.tim.c.chen@linux.intel.com>
         <20230612111602.GJ4253@hirez.programming.kicks-ass.net>
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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;
> > =20
> > +		if (busiest->group_type =3D=3D 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 <=3D (busiest->idle_cpus + 1))
> >  			/*
>=20
> Could you please add {} for all of them? The comment makes them all
> multi-line.

Will do.

Tim