Messages in this thread | | | Date | Wed, 17 Jul 2019 12:04:55 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH] arm64: Avoid pointless schedule_preempt_irq() invocations |
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On Wed, 17 Jul 2019, Valentin Schneider wrote:
> On 17/07/2019 09:43, Thomas Gleixner wrote: > > When preempt_count is zero on return from interrupt then > > schedule_preempt_irq() is invoked even if TIF_NEED_RESCHED is not set. > > > > That does not make sense because schedule_preempt_irq() has to go through a > > full __schedule() for nothing in that case. > > > > Check TIF_NEED_RESCHED and invoke schedule_preempt_irq() only if set. > > > > Signed-off-by: Thomas Gleixner <tglx@linutronix.de> > > Don't we have NEED_RESCHED squashed into preempt count? > > 396244692232 ("arm64: preempt: Provide our own implementation of asm/preempt.h") > > So the existing check should cover that, unless I'm missing something?
Right. Ignore me.
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