Tony Luck wrote:
>
> Cc: linux-kernel for generic bit of this change. Rest of patch was
> posted to linux-ia64: http://marc.theaimsgroup.com/?l=linux-ia64&m=116070997529216&w=2
>
> On Thu, Oct 12, 2006 at 10:25:58PM -0500, Russ Anderson wrote:
> > int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls)
> > {
> > - int err = 0;
> > + int err = 0, c;
> >
> > #ifdef CONFIG_SCHED_SMT
> > - if (smt_capable())
> > - err = sysfs_create_file(&cls->kset.kobj,
> > + for_each_online_cpu(c)
> > + if (smt_capable(c)) {
> > + err = sysfs_create_file(&cls->kset.kobj,
> > &attr_sched_smt_power_savings.attr);
> > + break;
> > + }
> > #endif
>
> What if you booted an all-Madison system, and then hot-plugged some
> Montecitos later? Either we'd need the hotplug cpu code to run through
> this routine again to re-test whether any cpu has multi-thread support
> (it doesn't look like it does that now).
>
> Or perhaps it would be simpler to dispense with this test and always
> call sysfs_create_file() here (still inside CONFIG_SCHED_SMT) so that
> the hook is always present to tune the scheduler (even if it may be
> ineffective on a no-smt system)?
I like that idea. Any objections or comments?
--
Russ Anderson, OS RAS/Partitioning Project Lead
SGI - Silicon Graphics Inc [email protected]
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