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

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH] sched/deadline: No need to check NULL later_mask
Date	2016-04-06 11:40 +0200
Message-ID	<rkS6m-1Kx-15@gated-at.bofh.it> (permalink)
References	<rj5ho-3uY-11@gated-at.bofh.it> <rj5r5-3yN-23@gated-at.bofh.it> <rj6ds-46Z-7@gated-at.bofh.it> <rja7o-70D-3@gated-at.bofh.it> <rjqOS-2eO-3@gated-at.bofh.it>
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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!

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Re: [PATCH] sched/deadline: No need to check NULL later_mask Peter Zijlstra <peterz@infradead.org> - 2016-04-06 11:40 +0200
  Re: [PATCH] sched/deadline: No need to check NULL later_mask Xunlei Pang <xpang@redhat.com> - 2016-04-06 15:10 +0200

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