From: Juri Lelli <juri.lelli@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: bigeasy@linutronix.de, linux-rt-users@vger.kernel.org,
peterz@infradead.org, linux-kernel@vger.kernel.org,
bristot@redhat.com, Anna-Maria Behnsen <anna-maria@linutronix.de>
Subject: Re: [RFC PATCH RT v2 1/2] time/hrtimer: Add PINNED_HARD mode for realtime hrtimers
Date: Mon, 21 Jun 2021 07:35:55 +0200 [thread overview]
Message-ID: <YNAlO4CScpaj65HG@localhost.localdomain> (raw)
In-Reply-To: <87bl82e19d.ffs@nanos.tec.linutronix.de>
Hi,
On 19/06/21 09:56, Thomas Gleixner wrote:
> On Sat, Jun 19 2021 at 01:35, Thomas Gleixner wrote:
> > The wild west of anything which scratches 'my itch' based on 'my use
> > case numbers' in Linux ended many years ago and while RT was always a
> > valuable playground for unthinkable ideas we definitely tried hard not
> > to accept use case specific hacks wihtout a proper justification that it
> > makes sense in general.
> >
> > So why are you even trying to sell this to me?
>
> I wouldn't have been that grumpy if you'd at least checked whether the
> task is pinned. Still I would have told you that you "fix" it at the
> wrong place.
Ah, indeed. Pulled the trigger too early it seems. I'll ponder more.
> Why on earth is that nohz heuristic trainwreck not even checking that?
> It's not a RT problem and it's not a problem restricted to RT tasks
> either. If a task is pinned then arming the timer on a random other CPU
> is blatant nonsense independent of the scheduling class.
Agree. Lemme look more into it.
Thanks for the comments!
Best,
Juri
next prev parent reply other threads:[~2021-06-21 5:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-16 7:17 [RFC PATCH RT v2 0/2] Add PINNED_HARD mode to hrtimers Juri Lelli
2021-06-16 7:17 ` [RFC PATCH RT v2 1/2] time/hrtimer: Add PINNED_HARD mode for realtime hrtimers Juri Lelli
2021-06-18 23:35 ` Thomas Gleixner
2021-06-19 7:56 ` Thomas Gleixner
2021-06-21 5:35 ` Juri Lelli [this message]
2021-06-16 7:17 ` [RFC PATCH RT v2 2/2] time/hrtimer: Embed hrtimer mode into hrtimer_sleeper Juri Lelli
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