From: Daniel Walker <dwalker@mvista.com>
To: paulmck@us.ibm.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: Attempted summary of "RT patch acceptance" thread, take 2
Date: Mon, 11 Jul 2005 09:49:48 -0700 [thread overview]
Message-ID: <1121100589.7050.24.camel@c-67-188-6-232.hsd1.ca.comcast.net> (raw)
In-Reply-To: <20050711164322.GD1304@us.ibm.com>
On Mon, 2005-07-11 at 09:43 -0700, Paul E. McKenney wrote:
> Hello, Daniel,
>
> In principle, one could inspect the Linux kernel with the PREEMPT_RT patch
> applied, and calculate the worst-case time during which interrupts are
> disabled, though I have not heard of anyone actually doing this. Is this
> what you are getting at, or are you thinking in terms of Kristian's and
> Karim's testing?
Well with the PREEMPT_RT patch applied the interrupt off sections are
reduced to a small number, ~100 irrespective of config options or
drivers (although I think APM might be the one exception) .
So with the patch applied it becomes trivial to test/inspect each of the
interrupt off sections , and thus give a hard guarantee for _all_
PREEMPT_RT kernels.
Daniel
next prev parent reply other threads:[~2005-07-11 16:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-11 14:55 Attempted summary of "RT patch acceptance" thread, take 2 Paul E. McKenney
2005-07-11 16:11 ` Daniel Walker
2005-07-11 16:43 ` Paul E. McKenney
2005-07-11 16:49 ` Daniel Walker [this message]
2005-07-11 17:19 ` Paul E. McKenney
2005-07-11 17:25 ` Daniel Walker
2005-07-13 14:29 ` Paul E. McKenney
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