linux-kernel - Re: [PATCH] An RCU for SMP with a single CPU garbage collector

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Message-ID: <20110308090742.GO3104@linux.vnet.ibm.com>
Date:	Tue, 8 Mar 2011 01:07:42 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Joe Korty <joe.korty@...r.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] An RCU for SMP with a single CPU garbage collector

On Mon, Mar 07, 2011 at 05:51:10PM -0500, Joe Korty wrote:
> On Mon, Mar 07, 2011 at 04:16:13PM -0500, Joe Korty wrote:
> > On Mon, Mar 07, 2011 at 04:01:57PM -0500, Paul E. McKenney wrote:
> >> But I would really prefer leveraging the existing RCU implementations
> >> to the extent possible.  Are the user-dedicated CPUs able to invoke
> >> system calls?  If so, something like Frederic's approach should permit
> >> the existing RCU implementations to operate normally.  If not, what is
> >> doing the RCU read-side critical sections on the dedicated CPUs?
> > 
> > I thought about the system call approach but rejected it.
> > Some (maybe many) customers needing dedicated CPUs will
> > have apps that never make any system calls at all.
> 
> Hi Paul,
> Thinking about it some more, the tap-into-syscall approach might
> work in my implementation, in which case the tap-into-preempt-enable
> code could go away.

OK, please let me know how that goes!

> Nice thing about RCU, the algorithms are infinitely mallable :)

Just trying to keep the code size finite.  ;-)

							Thanx, Paul
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