linux-kernel - Re: [PATCH 1/6] sched_ext: idle: Extend topology optimizations to all tasks

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Message-ID: <Z9yR1TYxni6wddnE@gpd3>
Date: Thu, 20 Mar 2025 23:08:21 +0100
From: Andrea Righi <arighi@...dia.com>
To: Tejun Heo <tj@...nel.org>
Cc: David Vernet <void@...ifault.com>, Changwoo Min <changwoo@...lia.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] sched_ext: idle: Extend topology optimizations to
 all tasks

Hi Tejun,

On Thu, Mar 20, 2025 at 06:49:47AM -1000, Tejun Heo wrote:
> On Thu, Mar 20, 2025 at 08:36:41AM +0100, Andrea Righi wrote:
> > +static const struct cpumask *task_cpumask(const struct task_struct *p, const struct cpumask *cpus,
> > +					  struct cpumask *local_cpus)
> > +{
> > +	/*
> > +	 * If the task is allowed to run on all CPUs, simply use the
> > +	 * architecture's cpumask directly. Otherwise, compute the
> > +	 * intersection of the architecture's cpumask and the task's
> > +	 * allowed cpumask.
> > +	 */
> > +	if (!cpus || p->nr_cpus_allowed >= num_possible_cpus() ||
> > +	    cpumask_subset(cpus, p->cpus_ptr))
> > +		return cpus;
> > +
> > +	if (!cpumask_equal(cpus, p->cpus_ptr) &&
> 
> Weren't we talkign about removing this test?

sorry, it's actually removed in PATCH 3/6, but I'll clean it up also in
this one.

Thanks,
-Andrea

> 
> Thanks.
> 
> -- 
> tejun