linux-kernel - Re: [PATCH] kernel/sched: Update schedstats when migrating threads

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Date:   Tue, 22 Feb 2022 12:15:46 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Carlos Bilbao <carlos.bilbao@....com>
Cc:     peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, mingo@...hat.com,
        dietmar.eggemann@....com, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/sched: Update schedstats when migrating threads

On Tue, 22 Feb 2022 10:32:32 -0600
Carlos Bilbao <carlos.bilbao@....com> wrote:

> > @@ -8765,7 +8766,14 @@ int migrate_task_to(struct task_struct *p, int target_cpu)
> >  	if (!cpumask_test_cpu(target_cpu, p->cpus_ptr))
> >  		return -EINVAL;
> >  
> > -	/* TODO: This is not properly updating schedstats */
> > +	if (schedstat_enabled()) {
> > +		forced_migrations = schedstat_val(p->stats.nr_forced_migrations);
> > +		migrations_cold = schedstat_val(p->stats.nr_migrations_cold);
> > +		memset(&p->stats, 0, sizeof(p->stats));
> > +		schedstat_set(p->stats.nr_forced_migrations, forced_migrations);
> > +		schedstat_set(p->stats.nr_migrations_cold, migrations_cold);
> > +		schedstat_inc(p->stats.nr_migrations_cold);
> > +	}
> >  
> >  	trace_sched_move_numa(p, curr_cpu, target_cpu);
> >  	return stop_one_cpu(curr_cpu, migration_cpu_stop, &arg);  
> 
> 
> I would love to hear some thoughts on this. 

I have no issues with this.

Peter?

-- Steve