linux-kernel - RE: [PATCH] irq_work: Add event-tracing points for irq

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Date:   Fri, 15 Apr 2022 03:02:43 +0000
From:   "Zhang, Qiang1" <qiang1.zhang@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "peterz@...radead.org" <peterz@...radead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] irq_work: Add event-tracing points for irq_work


On Thu, Apr 14 2022 at 14:38, Zqiang wrote:
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/irq_work.h>
> +
>  static DEFINE_PER_CPU(struct llist_head, raised_list);  static 
> DEFINE_PER_CPU(struct llist_head, lazy_list);  static 
> DEFINE_PER_CPU(struct task_struct *, irq_workd); @@ -81,7 +84,9 @@ 
> static void __irq_work_queue_local(struct irq_work *work)
>  	bool rt_lazy_work = false;
>  	bool lazy_work = false;
>  	int work_flags;
> +	int cpu = smp_processor_id();
>  
> +	trace_irq_work_queue_on(cpu, work);

>What about work_flags to see on which list this ends up?

The tracepoint have been record 'work->node.a_flags'  through check it to sure 
this irq-wrok is queued on which list

Thanks
Zqiang

>Thanks,
>
>        tglx