From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by zproxy.gmail.com with SMTP id k1so230805nzf for ; Mon, 03 Oct 2005 03:02:08 -0700 (PDT) Message-ID: Date: Mon, 3 Oct 2005 19:02:08 +0900 From: Magnus Damm Reply-To: Magnus Damm Subject: Re: [PATCH 00/07][RFC] i386: NUMA emulation In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Content-Disposition: inline References: <20050930073232.10631.63786.sendpatchset@cherry.local> <1128093825.6145.26.camel@localhost> Sender: owner-linux-mm@kvack.org Return-Path: To: David Lang Cc: Dave Hansen , Magnus Damm , linux-mm , Linux Kernel Mailing List List-ID: On 10/3/05, David Lang wrote: > On Mon, 3 Oct 2005, Magnus Damm wrote: > > > On 10/1/05, Dave Hansen wrote: > >> On Fri, 2005-09-30 at 16:33 +0900, Magnus Damm wrote: > >>> These patches implement NUMA memory node emulation for regular i386 PC:s. > >>> > >>> NUMA emulation could be used to provide coarse-grained memory resource control > >>> using CPUSETS. Another use is as a test environment for NUMA memory code or > >>> CPUSETS using an i386 emulator such as QEMU. > >> > >> This patch set basically allows the "NUMA depends on SMP" dependency to > >> be removed. I'm not sure this is the right approach. There will likely > >> never be a real-world NUMA system without SMP. So, this set would seem > >> to include some increased (#ifdef) complexity for supporting SMP && ! > >> NUMA, which will likely never happen in the real world. > > > > Yes, this patch set removes "NUMA depends on SMP". It also adds some > > simple NUMA emulation code too, but I am sure you are aware of that! > > =) > > > > I agree that it is very unlikely to find a single-processor NUMA > > system in the real world. So yes, "[PATCH 02/07] i386: numa on > > non-smp" adds _some_ extra complexity. But because SMP is set when > > supporting more than one cpu, and NUMA is set when supporting more > > than one memory node, I see no reason why they should be dependent on > > each other. Except that they depend on each other today and breaking > > them loose will increase complexity a bit. > > hmm, observation from the peanut gallery, would it make sene to look at > useing the NUMA code on single proc machines that use PAE to access more > then 4G or ram on a 32 bit system? Hm, maybe? =) What would you like to accomplish by that? / magnus -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org