linux-kernel - Re: [PATCH 4/6] sched_ext: idle: introduce SCX_PICK_IDLE_IN

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Message-ID: <Z6aC_7xnfC21Vkcf@slm.duckdns.org>
Date: Fri, 7 Feb 2025 12:02:39 -1000
From: Tejun Heo <tj@...nel.org>
To: Andrea Righi <arighi@...dia.com>
Cc: David Vernet <void@...ifault.com>, Changwoo Min <changwoo@...lia.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>, Ian May <ianm@...dia.com>,
	bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] sched_ext: idle: introduce SCX_PICK_IDLE_IN_NODE

On Fri, Feb 07, 2025 at 09:40:51PM +0100, Andrea Righi wrote:
> Introduce a new flag to restrict the selection of an idle CPU to a
> single specific NUMA node.
> 
> Signed-off-by: Andrea Righi <arighi@...dia.com>
> ---
>  kernel/sched/ext.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
> index 0063a646124bc..8dbe22167c158 100644
> --- a/kernel/sched/ext.c
> +++ b/kernel/sched/ext.c
> @@ -775,6 +775,7 @@ enum scx_deq_flags {
>  
>  enum scx_pick_idle_cpu_flags {
>  	SCX_PICK_IDLE_CORE	= 1LLU << 0,	/* pick a CPU whose SMT siblings are also idle */
> +	SCX_PICK_IDLE_IN_NODE	= 1LLU << 1,	/* pick a CPU in the same target NUMA node */
>  };

Please merge this into the patch which actually uses the flag.

Thanks.

-- 
tejun