linux-kernel - Re: [PATCH v3] sched_ext: Introduce LLC awareness to the default idle selection policy

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Message-ID: <ZxlNwjogmNHQi7Se@slm.duckdns.org>
Date: Wed, 23 Oct 2024 09:25:54 -1000
From: Tejun Heo <tj@...nel.org>
To: Andrea Righi <arighi@...dia.com>
Cc: David Vernet <void@...ifault.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] sched_ext: Introduce LLC awareness to the default
 idle selection policy

On Wed, Oct 23, 2024 at 01:47:18AM +0200, Andrea Righi wrote:
> Rely on the scheduler topology information to implement basic LLC
> awareness in the sched_ext build-in idle selection policy.
> 
> This allows schedulers using the built-in policy to make more informed
> decisions when selecting an idle CPU in systems with multiple LLCs, such
> as NUMA systems or chiplet-based architectures, and it helps keep tasks
> within the same LLC domain, thereby improving cache locality.
> 
> For efficiency, LLC awareness is applied only to tasks that can run on
> all the CPUs in the system for now. If a task's affinity is modified
> from user space, it's the responsibility of user space to choose the
> appropriate optimized scheduling domain.
> 
> Signed-off-by: Andrea Righi <arighi@...dia.com>

Applied to sched_ext/for-6.13.

Thanks.

-- 
tejun