linux-kernel - Re: [PATCH 4/6] sched_ext: Simplify UP support by enabling sched

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Message-ID: <20240805194913.GF42857@maniforge>
Date: Mon, 5 Aug 2024 14:49:13 -0500
From: David Vernet <void@...ifault.com>
To: Tejun Heo <tj@...nel.org>
Cc: peterz@...radead.org, linux-kernel@...r.kernel.org,
	kernel-team@...a.com, mingo@...hat.com
Subject: Re: [PATCH 4/6] sched_ext: Simplify UP support by enabling
 sched_class->balance() in UP

On Sat, Aug 03, 2024 at 04:40:11PM -1000, Tejun Heo wrote:
> On SMP, SCX performs dispatch from sched_class->balance(). As balance() was
> not available in UP, it instead called the internal balance function from
> put_prev_task_scx() and pick_next_task_scx() to emulate the effect, which is
> rather nasty.
> 
> Enabling sched_class->balance() on UP shouldn't cause any meaningful
> overhead. Enable balance() on UP and drop the ugly workaround.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Suggested-by: Peter Zijlstra <peterz@...radead.org>

Acked-by: David Vernet <void@...ifault.com>

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