Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems

On Wed, Aug 18, 2021 at 01:53:28PM +0200, Peter Zijlstra wrote:

On Wed, Aug 18, 2021 at 12:56:41PM +0200, Peter Zijlstra wrote:

quoted

On Wed, Aug 18, 2021 at 11:42:28AM +0100, Will Deacon wrote:

quoted

quoted

I think the idea looks good, but perhaps we could wrap things up a bit:

/* Comment about why this is useful with RT */
static cpumask_t *clear_user_cpus_ptr(struct task_struct *p)
{
	struct cpumask *user_mask = NULL;

	swap(user_mask, p->user_cpus_ptr);
	return user_mask;
}

void release_user_cpus_ptr(struct task_struct *p)
{
	kfree(clear_user_cpus_ptr(p));
}

Then just use clear_user_cpus_ptr() in sched/core.c where we know what
we're doing (well, at least one of us does!).

OK, I'll go make it like that.

Something like so then?

Looks good to me, thanks!

Will

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