On Mon, Apr 15, 2013 at 11:04:08AM -0500, Robin Holt wrote:
> 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?
I should have taken a few more minutes. I understand now. Will
do.
Robin
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