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

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Message-ID: <20071112170521.GA11113@linux.vnet.ibm.com>
Date:	Mon, 12 Nov 2007 09:05:21 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	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
Subject: Re: [PATCH, RFC] improved hacks to allow -rt to run kernbench on POWER

On Mon, Nov 12, 2007 at 07:48:45AM +1100, Benjamin Herrenschmidt wrote:
> 
> On Sun, 2007-11-11 at 09:45 -0500, Steven Rostedt wrote:
> > > Well, I suppose the patch could go in, maybe with some ifdef's
> > around
> > > the bits in _switch_to, there's little point in doing that on non-rt
> > > kernels.
> > 
> > As Nick Piggin already stated, and I'll even state it for the RT
> > kernel,
> > we do not allow preemption in switch_to. So it is safe to remove those
> > "preempt_disable" bits from the patch
> 
> Sure, I know that, I'm not talking about that, I'm talking about the
> added code that flush pending batches & save the batch state, since on
> non-rt kernel, this is not useful (the batch is only ever active within
> a spinlocked section, which cannot be preempted on non-rt).

Ah, I need a bit of conditional compilation.  Will fix.

							Thanx, Paul
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