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

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Message-ID: <20071101155028.GB14231@linux.vnet.ibm.com>
Date:	Thu, 1 Nov 2007 08:50:28 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Darren Hart <dvhltc@...ibm.com>, linux-kernel@...r.kernel.org,
	tony@...eyournoodle.com, paulus@...ba.org, dino@...ibm.com,
	tytso@...ibm.com, antonb@...ibm.com, rostedt@...dmis.org
Subject: Re: [PATCH, RFC] hacks to allow -rt to run kernbench on POWER

On Thu, Nov 01, 2007 at 08:15:28AM +1100, Benjamin Herrenschmidt wrote:
> 
> > So as Paul mentioned, spin_lock is now a mutex.  There is a new
> > raw_spinlock however (simply change the way it is declared, calling
> > conventions are the same) which is used in a very few areas where a
> > traditional spin_lock is truly necessary.  This may or may not be one of
> > those times, but I wanted to point it out.
> 
> Yeah, I figured that. My main worry has more to do with some fishy
> assumptions the powerpc VM code does regarding what can and cannot
> happen in those locked sections, among other things. I'll have to sit
> and think about it for a little while to convince myself we are ok ...
> or not. Plus we do keep track of various MM related things in per-CPU
> data structures but it looks like Paul already spotted that.

My concern would be that I failed to spot all of them.  ;-)

							Thanx, Paul
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