linux-kernel - Re: [PATCH] RFC: Set irq thread to RT priority on creation

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Message-ID: <1369925681.26799.6.camel@gandalf.local.home>
Date:	Thu, 30 May 2013 10:54:41 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ivo Sieben <meltedpianoman@...il.com>,
	RT <linux-rt-users@...r.kernel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] RFC: Set irq thread to RT priority on creation

On Thu, 2013-05-30 at 16:07 +0200, Thomas Gleixner wrote:

> > This patch solves an issue for me where a device driver is expected to handle an
> > interrupt immediatly after irq handlers are installed and interrupts enabled.
> 
> You miss to explain what kind of issue that is.

I could envision the case where the interrupt is initialized but doesn't
go off until much later. If it never ran, then it would still be in
SCHED_OTHER(), and that first interrupt could have a large delay.

-- Steve


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