Subject: Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch
From: Scott Wood (scott_AT_timesys.com)
Date: Thu Jul 29 2004 - 23:57:50 EEST
On Thu, Jul 29, 2004 at 10:26:30PM +0200, Pavel Machek wrote:
> Well, I do not follow you I guess.
>
> With large-enough number of hardirqs you do no progress at all.
>
> Even if only "sane" number of irqs, if they all decide to hit within one
> getpid(), this getpid is going to take quite long....
> Pavel
Ordinarily, yes. However, if it's a high-priority RT task that does
the getpid(), whose priority is higher than that of the RT tasks,
you'll get at most one hardirq stub per active IRQ number; after
that, the IRQs will be masked until their threads get a chance to be
scheduled.
-Scott
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