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

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Message-ID: <20241009091929.pB3mjZZd@linutronix.de>
Date: Wed, 9 Oct 2024 11:19:29 +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 2024-10-09 11:14:01 [+0200], Peter Zijlstra wrote:
> On Wed, Oct 09, 2024 at 10:50:21AM +0200, Sebastian Andrzej Siewior wrote:
> > 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.
> 
> Right you are; naming things be hard. How about: get_lazy_tif_bit() ?
> There's only the single user anyway.

perfect.

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

Sebastian