Re: [PATCH] sched/deadline: No need to check NULL later_mask

[Peter Zijlstra]

On Sat, Apr 02, 2016 at 06:14:28PM +0800, Xunlei Pang wrote:
> Your proposal is very nice!
> 
> At the sched_init() stage we only have one (to be "idle") task and with irq disabled,
> no scheduling will happen, and the cpu_possible_mask was already initiated, so it's
> safe to simply move them there.
> 
> Also, how about rt&deadline sharing a percpu mask? Because only one of them can
> use the mask at a moment, operations are always under some spin_lock_irqsave().
> 
> I made a new patch below, slightly tested by running tens of rt&dl tasks for a while,
> are you fine with it?

Yep, looks fine. Please submit as a proper patch.

Thanks!