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

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Message-ID: <alpine.LSU.2.21.2505131604530.19621@pobox.suse.cz>
Date: Tue, 13 May 2025 16:05:51 +0200 (CEST)
From: Miroslav Benes <mbenes@...e.cz>
To: Peter Zijlstra <peterz@...radead.org>
cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
    linux-kernel@...r.kernel.org, live-patching@...r.kernel.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, 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 Tue, 13 May 2025, Peter Zijlstra wrote:

> On Tue, May 13, 2025 at 03:34:50PM +0200, Miroslav Benes wrote:
> > Hi,
> > 
> > thanks for the updated version.
> > 
> > On Fri, 9 May 2025, 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.
> > 
> > livepatch selftests pass and I also ran some more.
> >  
> > > [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: Miroslav Benes <mbenes@...e.cz>
> > 
> > A nit below if there is an another version, otherwise Petr might fix it 
> > when merging.
> 
> Petr or Peter?
> 
> That is, who are we expecting to merge this :-)

Petr Mladek if it goes through the live patching tree, you if tip. Feel 
free to pick it up :).

> Anyway, I've zapped the line in my copy.

Thanks!

Miroslav