linux-kernel - Re: [RFC PATCH 0/6] RCU: Preemptible-RCU

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Message-ID: <20071213210936.GB7304@in.ibm.com>
Date:	Fri, 14 Dec 2007 02:39:36 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Paul E McKenney <paulmck@...ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Ted Tso <tytso@...ibm.com>, dvhltc@...ibm.com,
	Oleg Nesterov <oleg@...sign.ru>,
	Andrew Morton <akpm@...ux-foundation.org>, bunk@...nel.org,
	Josh Triplett <josh@...edesktop.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC PATCH 0/6] RCU: Preemptible-RCU

Hi Steve, 

On Thu, Dec 13, 2007 at 12:36:47PM -0500, Steven Rostedt wrote:
> On Thu, 13 Dec 2007, Gautham R Shenoy wrote:
> 
> >
> > Currently it is based against the latest linux-2.6-sched-devel.git
> >
> > Awaiting your feedback!
> 
> Hi Gautham,
> 
> Thanks for posting this. I believe this is the same version of preempt RCU
> as we have in the RT patch. It seems to be very stable. I ran the RT patch
> version of the RCU Preempt (just the Preempt RCU patches without RT on
> latest git) on a 64way box and the results seems just as good (if not
> slightly better) than classic RCU!  I'll rerun this patch series on that
> box and post the results.

The version of synchronize_sched() that's implemented in this patchset
requires these CPU-Hotplug patches -->
http://lkml.org/lkml/2007/11/15/239.

This is the reason why I rebased it against linux-2.6-sched-devel.git
since it already has those patches.

> 
> >From what I'm seening with this, is that it is ready for mainline. These
> patches should probably go into -mm and be ready for 2.6.25.  If Andrew
> wants to wait for my results, I'll run them tonight.
> 
> Thanks Gautham, Paul and Dipankar for all this great work!
> 

Anytime! That probably the only way I could teach myself how RCU works!

> -- Steve
> 

Thanks and Regards
gautham.
-- 
Gautham R Shenoy
Linux Technology Center
IBM India.
"Freedom comes with a price tag of responsibility, which is still a bargain,
because Freedom is priceless!"
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