linux-kernel - Re: [PATCH sched_ext/for-6.15] sched_ext: idle: Introduce node-aware idle cpu kfunc helpers

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Message-ID: <Z7TZIvaxzEDD2u9A@slm.duckdns.org>
Date: Tue, 18 Feb 2025 09:01:54 -1000
From: Tejun Heo <tj@...nel.org>
To: Andrea Righi <arighi@...dia.com>
Cc: David Vernet <void@...ifault.com>, Changwoo Min <changwoo@...lia.com>,
	Yury Norov <yury.norov@...il.com>,
	Joel Fernandes <joelagnelf@...dia.com>, Ian May <ianm@...dia.com>,
	bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH sched_ext/for-6.15] sched_ext: idle: Introduce node-aware
 idle cpu kfunc helpers

On Tue, Feb 18, 2025 at 07:04:41PM +0100, Andrea Righi wrote:
> Introduce a new kfunc to retrieve the node associated to a CPU:
> 
>  int scx_bpf_cpu_node(s32 cpu)
> 
> Add the following kfuncs to provide BPF schedulers direct access to
> per-node idle cpumasks information:
> 
>  const struct cpumask *scx_bpf_get_idle_cpumask_node(int node)
>  const struct cpumask *scx_bpf_get_idle_smtmask_node(int node)
>  s32 scx_bpf_pick_idle_cpu_node(const cpumask_t *cpus_allowed,
>  				int node, u64 flags)
>  s32 scx_bpf_pick_any_cpu_node(const cpumask_t *cpus_allowed,
>  			       int node, u64 flags)
> 
> Moreover, trigger an scx error when any of the non-node aware idle CPU
> kfuncs are used when SCX_OPS_BUILTIN_IDLE_PER_NODE is enabled.
> 
> Cc: Yury Norov [NVIDIA] <yury.norov@...il.com>
> Signed-off-by: Andrea Righi <arighi@...dia.com>

Applied to sched_ext/for-6.15.

Thanks.

-- 
tejun