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

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Message-Id: <1194952142.18185.104.camel@pasglop>
Date:	Tue, 13 Nov 2007 22:09:02 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Peter Zijlstra <peterz@...radead.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:
> Looking at the code:
> 
> /* radix tree not lockless safe ! we use a brlock-type mecanism
>  * for now, until we can use a lockless radix tree
>  */
> static void irq_radix_wrlock(unsigned long *flags)
> 
> The RCU radix tree stuffs have gone upstream long ago.
> 
> 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?

As discussed on IRC< there are a couple of other related issues, though
part of them go away if I can get rid of the brlock I have in there
thanks to the new RCU based radix tree.

I'll give that some thoughts and come back to you tomorrow or thursday
hopefully with a patch.

Cheers,
Ben.


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