Re: [PATCH] sched: optimize __cond_resched_lock()

[Peter Zijlstra]

On Tue, Dec 21, 2021 at 03:23:16PM +0800, xuhaifeng wrote:
> if the kernel is preemptible(CONFIG_PREEMPTION=y), schedule()may be
> called twice, once via spin_unlock, once via preempt_schedule_common.
> 
> we can add one conditional, check TIF_NEED_RESCHED flag again,
> to avoid this.

You can also make it more similar to __cond_resched() instead of making
it more different.