Re: [PATCH v4 07/10] sched/psi: add PSI_IRQ to track IRQ/SOFTIRQ pressure

[Johannes Weiner]

On Fri, Aug 26, 2022 at 12:41:08AM +0800, Chengming Zhou wrote:
> Now PSI already tracked workload pressure stall information for
> CPU, memory and IO. Apart from these, IRQ/SOFTIRQ could have
> obvious impact on some workload productivity, such as web service
> workload.
> 
> When CONFIG_IRQ_TIME_ACCOUNTING, we can get IRQ/SOFTIRQ delta time
> from update_rq_clock_task(), in which we can record that delta
> to CPU curr task's cgroups as PSI_IRQ_FULL status.
> 
> Note we don't use PSI_IRQ_SOME since IRQ/SOFTIRQ always happen in
> the current task on the CPU, make nothing productive could run
> even if it were runnable, so we only use PSI_IRQ_FULL.
> 
> Signed-off-by: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>