linux-kernel - Re: [PATCH 05/31] sched: Add sched_class->reweight

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 12 Dec 2022 07:34:27 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     torvalds@...ux-foundation.org, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...nel.org, joshdon@...gle.com, brho@...gle.com,
        pjt@...gle.com, derkling@...gle.com, haoluo@...gle.com,
        dvernet@...a.com, dschatzberg@...a.com, dskarlat@...cmu.edu,
        riel@...riel.com, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH 05/31] sched: Add sched_class->reweight_task()

Hello,

On Mon, Dec 12, 2022 at 12:22:43PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 29, 2022 at 10:22:47PM -1000, Tejun Heo wrote:
> > diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> > index a4a20046e586..08799b2a566e 100644
> > --- a/kernel/sched/sched.h
> > +++ b/kernel/sched/sched.h
> > @@ -2193,6 +2193,8 @@ struct sched_class {
> >  	 */
> >  	void (*switched_from)(struct rq *this_rq, struct task_struct *task);
> >  	void (*switched_to)  (struct rq *this_rq, struct task_struct *task);
> > +	void (*reweight_task)(struct rq *this_rq, struct task_struct *task,
> > +			      int newprio);
> >  	void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
> >  			      int oldprio);
> 
> Hurmph.. this further propagate the existing problem of thinking that
> 'prio' is a useful concept in general (it isn't).

I'm not quite following. Can you please expand on why prio isn't a generally
useful concept?

Thanks.

-- 
tejun