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

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Date:	Mon, 12 Nov 2007 07:48:45 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	paulmck@...ux.vnet.ibm.com, 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 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).

Ben.
 

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