linux-kernel - Re: [PATCH 2/7] sched_ext: Add an event, SCX_EVENT_OFFLINE_LOCAL

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Message-ID: <Z4m0XLq_EsECnAl2@slm.duckdns.org>
Date: Thu, 16 Jan 2025 15:37:32 -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 2/7] sched_ext: Add an event, SCX_EVENT_OFFLINE_LOCAL_DSQ

On Fri, Jan 17, 2025 at 12:15:38AM +0900, Changwoo Min wrote:
...
> diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
> index 7e12d5b8322e..8054e4e5ed0c 100644
> --- a/kernel/sched/ext.c
> +++ b/kernel/sched/ext.c
> @@ -1467,6 +1467,12 @@ struct scx_event_stat {
>  	 * the core scheduler code silently picks a fallback CPU.
>  	 */
>  	u64		INVAL_SELECT_CPU;
> +
> +	/*
> +	 * When dispatching to a local DSQ, the CPU may have gone offline in
> +	 * the meantime. In this case, the task is bounced to the global DSQ.
> +	 */
> +	u64		OFFLINE_LOCAL_DSQ;

Let's do components in descending order + event:

- SELECT_CPU_INVAL (or SELECT_CPU_FALLBACK)
- DISPATCH_LOCAL_DSQ_OFFLINE

Thanks.

-- 
tejun