Re: [PATCH] ring-buffer: Use a housekeeping CPU to wake up waiters

[Steven Rostedt]

On Wed, 7 Jan 2026 11:17:09 -0500
Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> Or we simply change it to:
> 
> static inline void

Actually, the above should be noinline, as it's in a slower path, and
should not be adding logic into the cache of the fast path.

-- Steve


> rb_irq_work_queue(struct rb_irq_work *irq_work)
> {
> 	int cpu;
> 
> 	/* irq_work_queue_on() is not allowed in NMI context */
> 	if (in_nmi()) {
> 		irq_work_queue(&irq_work->work, cpu);
> 		return;
> 	}
> 
> 	cpu = housekeeping_any_cpu(HK_TYPE_KERNEL_NOISE);
> 	/*
> 	 * If CPU isolation is not active, cpu is always the current
> 	 * CPU, and the following is equivallent to irq_work_queue().
> 	 */
> 	irq_work_queue_on(&irq_work->work, cpu);
> }