linux-kernel - Re: [patch V6 10/11] entry: Hook up rseq time slice extension

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Message-ID: <d8215f9a-3088-483c-bd96-4058767b886d@efficios.com>
Date: Tue, 16 Dec 2025 10:37:24 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>
Cc: "Paul E. McKenney" <paulmck@...nel.org>, Boqun Feng
 <boqun.feng@...il.com>, Jonathan Corbet <corbet@....net>,
 Prakash Sangappa <prakash.sangappa@...cle.com>,
 Madadi Vineeth Reddy <vineethr@...ux.ibm.com>,
 K Prateek Nayak <kprateek.nayak@....com>,
 Steven Rostedt <rostedt@...dmis.org>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
 Randy Dunlap <rdunlap@...radead.org>, Peter Zijlstra <peterz@...radead.org>,
 Ron Geva <rongevarg@...il.com>, Waiman Long <longman@...hat.com>
Subject: Re: [patch V6 10/11] entry: Hook up rseq time slice extension

On 2025-12-15 13:24, Thomas Gleixner wrote:
> Wire the grant decision function up in exit_to_user_mode_loop()
> 
[...]
>   
> +/* TIF bits, which prevent a time slice extension. */
> +#ifdef CONFIG_PREEMPT_RT
> +# define TIF_SLICE_EXT_SCHED	(_TIF_NEED_RESCHED_LAZY)
> +#else
> +# define TIF_SLICE_EXT_SCHED	(_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)

It would be relevant to explain the difference between RT and non-RT
in the commit message.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com