linux-kernel - Re: [PATCH v2] sched,livepatch: Untangle cond

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Message-ID: <87tt5nikby.ffs@tglx>
Date: Wed, 14 May 2025 11:59:45 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 linux-kernel@...r.kernel.org, live-patching@...r.kernel.org
Cc: Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf
 <jpoimboe@...hat.com>, mingo@...nel.com, juri.lelli@...hat.com,
 vincent.guittot@...aro.org, dietmar.eggemann@....com, rostedt@...dmis.org,
 bsegall@...gle.com, mgorman@...e.de, vschneid@...hat.com,
 jpoimboe@...nel.org, jikos@...nel.org, mbenes@...e.cz, pmladek@...e.com,
 joe.lawrence@...hat.com
Subject: Re: [PATCH v2] sched,livepatch: Untangle cond_resched() and
 live-patching

On Fri, May 09 2025 at 13:36, Sebastian Andrzej Siewior wrote:
> From: Peter Zijlstra <peterz@...radead.org>
>
> With the goal of deprecating / removing VOLUNTARY preempt, live-patch
> needs to stop relying on cond_resched() to make forward progress.
>
> Instead, rely on schedule() with TASK_FREEZABLE set. Just like
> live-patching, the freezer needs to be able to stop tasks in a safe /
> known state.
>
> Compile tested only.
>
> [bigeasy: use likely() in __klp_sched_try_switch() and update comments]
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>