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 <rost...@goodmis.org> 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);
> }