From: Steven Rostedt <rostedt@goodmis.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Carsten Emde <C.Emde@osadl.org>,
Linux RT Users <linux-rt-users@vger.kernel.org>
Subject: Re: [OSADL QA 3.18.9-rt5 #1]
Date: Wed, 13 May 2015 11:23:56 -0400 [thread overview]
Message-ID: <20150513112356.1e1ebfb8@gandalf.local.home> (raw)
In-Reply-To: <20150513081236.GA21106@linutronix.de>
On Wed, 13 May 2015 10:12:36 +0200
Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:
> * Steven Rostedt | 2015-05-11 20:15:06 [-0400]:
>
> >I'm backporting this to the stable releases, and I'm a bit worried
> >about the above comment. The new Scheduler IPI code uses work queues and
> >requires it to be done in a hard irq.
>
> The IPI part is only done for the high-prio which is only used by NOHZ.
> Everyone else gets in via softiq as we did it before.
>
My push/pull RT tasks via IPI, uses the irq_work to do this. It has
nothing to do with NOHZ, and will cause serious latencies if it is done
by softirq.
-- Steve
next prev parent reply other threads:[~2015-05-13 15:24 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-07 22:52 [OSADL QA 3.18.9-rt5 #1] Carsten Emde
2015-04-09 12:37 ` Sebastian Andrzej Siewior
2015-04-09 16:53 ` Sebastian Andrzej Siewior
2015-04-10 12:36 ` Sebastian Andrzej Siewior
2015-04-11 1:35 ` Carsten Emde
2015-04-20 21:22 ` [RESOLVED OSADL " Carsten Emde
2015-05-12 0:15 ` [OSADL " Steven Rostedt
2015-05-13 8:12 ` Sebastian Andrzej Siewior
2015-05-13 15:23 ` Steven Rostedt [this message]
2015-05-13 16:34 ` Steven Rostedt
2015-06-11 15:27 ` Sebastian Andrzej Siewior
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