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

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Message-ID: <kdg7dlwiec53dqtf37qx4whsra6ahplgxpdc7zg6mpr5eshkvp@wmct3blis2js>
Date: Tue, 13 May 2025 14:40:51 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: linux-kernel@...r.kernel.org, live-patching@...r.kernel.org, 
	Peter Zijlstra <peterz@...radead.org>, 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, jikos@...nel.org, 
	mbenes@...e.cz, pmladek@...e.com, joe.lawrence@...hat.com, 
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2] sched,livepatch: Untangle cond_resched() and
 live-patching

On Fri, May 09, 2025 at 01:36:59PM +0200, 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>

Acked-by: Josh Poimboeuf <jpoimboe@...nel.org>

-- 
Josh