From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Pekka Enberg <penberg@cs.helsinki.fi>,
Ingo Molnar <mingo@elte.hu>,
Jeremy Fitzhardinge <jeremy@goop.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Andi Kleen <andi@firstfloor.org>,
"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
Suresh Siddha <suresh.b.siddha@intel.com>,
Jens Axboe <jens.axboe@oracle.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2] smp_call_function: use rwlocks on queues rather than rcu
Date: Mon, 25 Aug 2008 13:05:09 -0700 [thread overview]
Message-ID: <20080825200509.GH6745@linux.vnet.ibm.com> (raw)
In-Reply-To: <48B2D343.4020100@linux-foundation.org>
On Mon, Aug 25, 2008 at 10:44:03AM -0500, Christoph Lameter wrote:
> Paul E. McKenney wrote:
>
> > But I am not sure that this gets the grace periods to go fast enough to
> > cover Christoph's use case -- he seems to be in a "faster is better"
> > space rather than in an "at least this fast" space. Still, it would
> > likely help in some important cases.
>
> I think there was an AIM9 regression in the close/open tests when the struct
> file was switched to RCU. That test could be run with various intervals to
> figure out if a shorter RCU period is beneficial and how short an RCU period
> is needed to avoid the regression.
Well, with some luck, I can get an RCU implementation that allows the
grace-period duration to be varied, which would allow someone to check
the AIM9 regression.
Thanx, Paul
prev parent reply other threads:[~2008-08-25 20:05 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-22 0:29 [PATCH 2/2] smp_call_function: use rwlocks on queues rather than rcu Jeremy Fitzhardinge
2008-08-22 1:53 ` Nick Piggin
2008-08-22 6:28 ` Ingo Molnar
2008-08-22 7:06 ` Pekka Enberg
2008-08-22 7:12 ` Ingo Molnar
2008-08-22 9:12 ` Nick Piggin
2008-08-22 14:01 ` Christoph Lameter
2008-08-22 15:11 ` Paul E. McKenney
2008-08-22 17:14 ` Christoph Lameter
2008-08-22 18:29 ` Paul E. McKenney
2008-08-22 18:33 ` Andi Kleen
2008-08-22 18:35 ` Jeremy Fitzhardinge
2008-08-23 7:34 ` Andi Kleen
2008-08-24 4:55 ` Jeremy Fitzhardinge
2008-08-24 9:01 ` Andi Kleen
2008-08-22 22:40 ` Paul E. McKenney
2008-08-22 18:36 ` Christoph Lameter
2008-08-22 19:52 ` Paul E. McKenney
2008-08-22 20:03 ` Christoph Lameter
2008-08-22 20:53 ` Paul E. McKenney
2008-08-25 10:31 ` Peter Zijlstra
2008-08-25 15:12 ` Paul E. McKenney
2008-08-25 15:22 ` Peter Zijlstra
2008-08-25 15:46 ` Christoph Lameter
2008-08-25 15:51 ` Peter Zijlstra
2008-08-26 13:43 ` Paul E. McKenney
2008-08-26 14:07 ` Peter Zijlstra
2008-08-27 15:16 ` Paul E. McKenney
2008-08-25 20:04 ` Paul E. McKenney
2008-08-26 5:13 ` Nick Piggin
2008-08-26 13:40 ` [PATCH 2/2] smp_call_function: use rwlocks on queues rather?than rcu Paul E. McKenney
2008-08-25 15:44 ` [PATCH 2/2] smp_call_function: use rwlocks on queues rather than rcu Christoph Lameter
2008-08-25 20:05 ` Paul E. McKenney [this message]
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