linux-kernel - Re: [PATCH 3/7] sched_ext: Add an event, SCX_EVENT_CNTD_RUN_WO

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Message-ID: <Z4m0xAaDoaeIMrK4@slm.duckdns.org>
Date: Thu, 16 Jan 2025 15:39:16 -1000
From: Tejun Heo <tj@...nel.org>
To: Changwoo Min <changwoo@...lia.com>
Cc: void@...ifault.com, arighi@...dia.com, kernel-dev@...lia.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] sched_ext: Add an event, SCX_EVENT_CNTD_RUN_WO_ENQ

On Fri, Jan 17, 2025 at 12:15:39AM +0900, Changwoo Min wrote:
> Add a core event, SCX_EVENT_CNTD_RUN_WO_ENQ, which represents how many
> times a task is continued to run without ops.enqueue() when SCX_OPS_ENQ_LAST
> is not set.
> 
> Signed-off-by: Changwoo Min <changwoo@...lia.com>
> ---
>  kernel/sched/ext.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
> index 8054e4e5ed0c..909f12a41934 100644
> --- a/kernel/sched/ext.c
> +++ b/kernel/sched/ext.c
> @@ -1473,6 +1473,12 @@ struct scx_event_stat {
>  	 * the meantime. In this case, the task is bounced to the global DSQ.
>  	 */
>  	u64		OFFLINE_LOCAL_DSQ;
> +
> +	/*
> +	 * If SCX_OPS_ENQ_LAST is not set, the number of times that a task
> +	 * continued to run because there were no other tasks on the CPU.
> +	 */
> +	u64		CNTD_RUN_WO_ENQ;

DISPATCH_KEEP_LAST?

-- 
tejun