From: Daniel Walker <dwalker@mvista.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Re: 2.6.15-rt3 + Open Posix Test Suite
Date: Wed, 11 Jan 2006 06:41:00 -0800 [thread overview]
Message-ID: <1136990460.17984.11.camel@localhost.localdomain> (raw)
In-Reply-To: <1136951593.6197.81.camel@localhost.localdomain>
On Tue, 2006-01-10 at 22:53 -0500, Steven Rostedt wrote:
>
> This runs a while loop at SCHED_FIFO prio 99? And alarm never happens.
> Doesn't the alarm get activated by the softirqd that is running at a
> lower priority? Seems that this is starving out the softirq from
> getting the alarm.
I thought alarm was a signal (SIGALRM) ? If it's delivered by softirqd
then this makes sense. Your right , it's softirqd related.
The processes also calls yield() inside it's while loop . We have
warnings about yield() and RT tasks.
> I believe that Thomas once had priorities attached to the timers. I'd
> like to see that again, and may even start adding them myself, such that
> when a process activates a timer, when that timer goes off, the softirq
> will get the priority of the timer. But this has some complications to
> be sorted out.
Yes, I remember . Do we fix the test in this case, or the kernel ?
Daniel
prev parent reply other threads:[~2006-01-11 14:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-10 23:03 2.6.15-rt3 + Open Posix Test Suite Daniel Walker
2006-01-11 3:53 ` Steven Rostedt
2006-01-11 14:41 ` Daniel Walker [this message]
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