From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [203.10.76.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mx.ozlabs.org", Issuer "CA Cert Signing Authority" (verified OK)) by bilbo.ozlabs.org (Postfix) with ESMTPS id 1BBC4B70E0 for ; Thu, 2 Jul 2009 08:13:30 +1000 (EST) Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 5CA03DDD04 for ; Thu, 2 Jul 2009 08:13:29 +1000 (EST) Subject: Re: Preemption question (4xx related) From: Benjamin Herrenschmidt To: Felix Radensky In-Reply-To: <24271342.post@talk.nabble.com> References: <24271342.post@talk.nabble.com> Content-Type: text/plain Date: Thu, 02 Jul 2009 08:13:13 +1000 Message-Id: <1246486393.14483.14.camel@pasglop> Mime-Version: 1.0 Cc: linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Tue, 2009-06-30 at 05:55 -0700, Felix Radensky wrote: > Hi, > > Preemption is disabled on the vast majority of powerpc > targets. Are there any known problems in this area ? > I'd like to enable CONFIG_PREEMPT_VOLUNTARY on > AMCC 405EX target, to increase application responsiveness. > Is it a bad idea ? In theory it should work, but as you may have noticed, it's generally disabled and thus not very well tested. It would be a good idea for us, some of the core devs, to turn that on in our usual test configs in fact. Cheers, Ben.