linux-kernel - Re: [PATCH V5 1/6] Sched: Scheduler time slice extension

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Message-ID: <20250604103106.1465f847@gandalf.local.home>
Date: Wed, 4 Jun 2025 10:31:06 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Prakash Sangappa <prakash.sangappa@...cle.com>
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org,
 mathieu.desnoyers@...icios.com, tglx@...utronix.de, bigeasy@...utronix.de,
 kprateek.nayak@....com, vineethr@...ux.ibm.com
Subject: Re: [PATCH V5 1/6] Sched: Scheduler time slice extension

On Tue,  3 Jun 2025 23:36:49 +0000
Prakash Sangappa <prakash.sangappa@...cle.com> wrote:

> @@ -2249,6 +2251,20 @@ static inline bool owner_on_cpu(struct task_struct *owner)
>  unsigned long sched_cpu_util(int cpu);
>  #endif /* CONFIG_SMP */
>  
> +#ifdef CONFIG_RSEQ
> +
> +extern bool rseq_delay_resched(void);
> +extern void rseq_delay_resched_fini(void);
> +extern void rseq_delay_resched_tick(void);
> +
> +#else
> +
> +static inline bool rseq_delay_resched(void) { return false; }
> +static inline void rseq_delay_resched_fini(void) { }
> +static inline void rseq_delay_resched_tick(void) { }
> +
> +#endif
> +

Can we add a config to make this optional. I don't want to allow any task
to have an extended timeslice over RT tasks regardless of how small the
delay is.

-- Steve