linux-kernel - Re: [PATCH 2/6] sched_ext: Add scx_enabled() test to @start_class promotion in put_prev_task

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Message-ID: <20240805175733.GD42857@maniforge>
Date: Mon, 5 Aug 2024 12:57:33 -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 2/6] sched_ext: Add scx_enabled() test to @start_class
 promotion in put_prev_task_balance()

On Sat, Aug 03, 2024 at 04:40:09PM -1000, Tejun Heo wrote:
> SCX needs its balance() invoked even when waking up from a lower priority
> sched class (idle) and put_prev_task_balance() thus has the logic to promote
> @start_class if it's lower than ext_sched_class. This is only needed when
> SCX is enabled. Add scx_enabled() test to avoid unnecessary overhead when
> SCX is disabled.
> 
> 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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