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

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Message-ID: <b927d8be-ff66-457b-957d-4c96821bfd84@igalia.com>
Date: Fri, 17 Jan 2025 16:11:10 +0900
From: Changwoo Min <changwoo@...lia.com>
To: Tejun Heo <tj@...nel.org>
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

Hello,

On 25. 1. 17. 10:37, Tejun Heo wrote:
> 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

Sure. Will change it in the next version.

Regards,
Changwoo Min