Messages in this thread | | | Subject | Re: [PATCH 00/07][RFC] i386: NUMA emulation | From | Dave Hansen <> | Date | Fri, 30 Sep 2005 08:23:44 -0700 |
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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.
Also, I worry that simply #ifdef'ing things out like CPUsets' update means that CPUsets lacks some kind of abstraction that it should have been using in the first place. An #ifdef just papers over the real problem.
I think it would likely be cleaner if the approach was to emulate an SMP NUMA system where each NUMA node simply doesn't have all of its CPUs online.
-- Dave
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