linux-kernel - Re: [PATCH v2] sched_ext: improve WAKE_SYNC behavior for default idle CPU selection

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Message-ID: <ZxLEfqsZJH6Mp1Fd@slm.duckdns.org>
Date: Fri, 18 Oct 2024 10:26:38 -1000
From: Tejun Heo <tj@...nel.org>
To: Andrea Righi <andrea.righi@...ux.dev>
Cc: David Vernet <void@...ifault.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sched_ext: improve WAKE_SYNC behavior for default
 idle CPU selection

On Fri, Oct 18, 2024 at 08:09:51PM +0200, Andrea Righi wrote:
> In the sched_ext built-in idle CPU selection logic, when handling a
> WF_SYNC wakeup, we always attempt to migrate the task to the waker's
> CPU, as the waker is expected to yield the CPU after waking the task.
> 
> However, it may be preferable to keep the task on its previous CPU if
> the waker's CPU is cache-affine.
> 
> The same approach is also used by the fair class and in other scx
> schedulers, like scx_rusty and scx_bpfland.
> 
> Therefore, apply the same logic to the built-in idle CPU selection
> policy as well.
> 
> Signed-off-by: Andrea Righi <andrea.righi@...ux.dev>

Applied to sched_ext/for-6.13.

Thanks.

-- 
tejun