linux-kernel - Re: [PATCH, RFC] improved hacks to allow -rt to run kernbench on POWER

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Date:	Tue, 13 Nov 2007 11:59:05 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	benh@...nel.crashing.org
Cc:	paulmck@...ux.vnet.ibm.com, Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, tony@...eyournoodle.com,
	paulus@...ba.org, dino@...ibm.com, tytso@...ibm.com,
	dvhltc@...ibm.com, niv@...ibm.com, antonb@...ibm.com,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH, RFC] improved hacks to allow -rt to run kernbench on
	POWER


On Tue, 2007-11-13 at 11:05 +0100, Peter Zijlstra wrote:

> Anyway, it seems its the generic irq stuff that uses raw_spinlock_t and
> disables IRQs, so there isn't much we can do from the ARCH level I'm
> afraid :-(
> 
> Ingo, any sane ideas?

Ok benh came up with a workable idea, he just needs a night's sleep to
come up with the details :-)

The idea is to fill the radix tree from host->ops->map() (or
irq_create_mapping()) as that should still be preemptable, and then
convert all other uses to RCU lookups.



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