linux-kernel - Re: [PATCH V3 1/4] Sched: Scheduler time slice extension

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Message-ID: <20250502123433.AHDVLZdY@linutronix.de>
Date: Fri, 2 May 2025 14:34:33 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Prakash Sangappa <prakash.sangappa@...cle.com>
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org, rostedt@...dmis.org,
	mathieu.desnoyers@...icios.com, tglx@...utronix.de,
	kprateek.nayak@....com
Subject: Re: [PATCH V3 1/4] Sched: Scheduler time slice extension

On 2025-05-02 01:59:52 [+0000], Prakash Sangappa wrote:
> diff --git a/kernel/entry/common.c b/kernel/entry/common.c
> index 20154572ede9..b26adccb32df 100644
> --- a/kernel/entry/common.c
> +++ b/kernel/entry/common.c
> @@ -98,8 +99,12 @@ __always_inline unsigned long exit_to_user_mode_loop(struct pt_regs *regs,
>  
>  		local_irq_enable_exit_to_user(ti_work);
>  
> -		if (ti_work & (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY))
> -			schedule();
> +		if (ti_work & (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)) {

I asked to limit this to LAZY only.

> +		       if (irq && rseq_delay_resched())
> +			       clear_tsk_need_resched(current);
> +		       else
> +			       schedule();
> +		}
>  
>  		if (ti_work & _TIF_UPROBE)
>  			uprobe_notify_resume(regs);

Sebastian