Re: [PATCH] sched: idle: move need_resched check after function rcu_idle_enter
From: Peter Zijlstra
Date: Mon Nov 23 2015 - 08:05:44 EST
On Sat, Nov 21, 2015 at 01:02:02AM -0800, Lianwei Wang wrote:
> The rcu_idle_endter may call wakeup_softirqd to set the need resched
> flag on idle process. But if we don't check it after that, then the
> cpu will enter idle state with RESCHED flag set and can not be woken
> up by wakeup/resched call anymore.
Fair enough; but which cpuidle driver did you observe that with? All the
ones I checked test for need_resched again after this.
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