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From: "Manfred Spraul" <manfred@colorfullife.com>
To: "Pavel Machek" <pavel@suse.cz>
Cc: <geirt@powertech.no>, <linux-kernel@vger.kernel.org>
In-Reply-To: <000401c0b319517fea9@local> <20010325231013.A34@(none)>
Subject: Re: Serial port latency
Date: Thu, 29 Mar 2001 09:58:31 +0200
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From: "Pavel Machek" <pavel@suse.cz>
> > Is the computer otherwise idle?
> > I've seen one unexplainable report with atm problems that
disappeared
> > (!) if a kernel compile was running.
>
> I've seen similar bugs. If you hook something on schedule_tq and
forget
> to set current->need_resched, this is exactly what you get.
>
I'm running with a patch that printk's if cpu_idle() is called while a
softirq is pending.
If I access the floppy on my K6/200 every track triggers the check, and
sometimes the console blanking code triggers it.

What about creating a special cpu_is_idle() function that the idle
functions must call before sleeping?

--
    Manfred

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