linux-kernel - Re: [PATCH 2/5] sched: Add Lazy preemption model

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Message-ID: <20241009085021.cw9147B8@linutronix.de>
Date: Wed, 9 Oct 2024 10:50:21 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Peter Zijlstra <peterz@...radead.org>
Cc: tglx@...utronix.de, mingo@...nel.org, linux-kernel@...r.kernel.org,
	juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
	mgorman@...e.de, vschneid@...hat.com, ankur.a.arora@...cle.com,
	efault@....de
Subject: Re: [PATCH 2/5] sched: Add Lazy preemption model

On 2024-10-07 09:46:11 [+0200], Peter Zijlstra wrote:
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1103,6 +1106,32 @@ void resched_curr(struct rq *rq)
…
> +static __always_inline int tif_need_resched_lazy(void)

The naming is a bit confusing here because tif_need_resched() checks if
the TIF_NEED_RESCHED is set while this returns the proper TIF bit
instead.

> +{
> +	if (dynamic_preempt_lazy())
> +		return TIF_NEED_RESCHED_LAZY;
> +
> +	return TIF_NEED_RESCHED;
> +}

Sebastian