On Sat, Apr 13, 2013 at 06:30:22PM +0200, Oleg Nesterov wrote:
> On 04/12, Robin Holt wrote:
> >
> > +void migrate_to_boot_cpu(void)
> > +{
> > + /* The boot cpu is always logical cpu 0 */
> > + int reboot_cpu_id = 0;
> > +
> > + /* Make certain the cpu I'm about to reboot on is online */
> > + if (!cpu_online(reboot_cpu_id))
> > + reboot_cpu_id = smp_processor_id();
> > +
> > + /* Make certain I only run on the appropriate processor */
> > + set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
>
> This is only theoretical, but perhaps it makes sense to set
> PF_THREAD_BOUND before set_cpus_allowed_ptr() ? To prevent the
> race with another thread doing sched_setaffinity().
I don't quite understand this comment. We are migrating our own thread.
How does setting PF_THREAD_BOUND have any effect?
Robin
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