Messages in this thread | | | Date | Mon, 3 Oct 2005 19:02:08 +0900 | From | Magnus Damm <> | Subject | Re: [PATCH 00/07][RFC] i386: NUMA emulation |
| |
On 10/3/05, David Lang <david.lang@digitalinsight.com> wrote: > On Mon, 3 Oct 2005, Magnus Damm wrote: > > > On 10/1/05, Dave Hansen <haveblue@us.ibm.com> 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |