On Mon, Sep 14, 2009 at 02:28:27PM -0700, David Rientjes wrote: > On Mon, 14 Sep 2009, David Rientjes wrote: > > > > On PPC64, the parameters behave differently. I couldn't convince it to > > > create more than one NUMA node. On x86-64, the NUMA nodes appeared to > > > exist and would be visible on /proc/buddyinfo for example but the sysfs > > > directories for the fake nodes were not created so nr_hugepages couldn't > > > be examined on a per-node basis for example. > > > > > > > I don't know anything about the ppc64 fake NUMA, but the sysfs node > > directories should certainly be created on x86_64. I'll look into it > > because that's certainly a bug. Thanks. > > > > This works on my machine just fine. > > For example, with numa=fake=8: > > $ ls /sys/devices/system/node > has_cpu has_normal_memory node0 node1 node2 node3 node4 > node5 node6 node7 online possible > > $ ls /sys/devices/system/node/node3 > cpu4 cpu5 cpu6 cpu7 cpulist cpumap distance meminfo > numastat scan_unevictable_pages > > I don't see how this could differ if bootmem is setting up the nodes > correctly, which dmesg | grep "^Bootmem setup node" would reveal. > > The defconfig disables CONFIG_NUMA_EMU now, though, so perhaps it got > turned off by accident in your kernel? > I don't think so because my recollection is that the nodes existed according to meminfo and buddyinfo but not the sysfs files. Unfortunately I can't remember the reproduction scenario. I thought it was on mmotm-2009-08-27-16-51 on a particularly machine but when I went to reproduce, it didn't even boot so somewhere along the line I busted things. > Let me know if there's any abnormalities with your particular setup. > Will try reproducing on more recent mmotm and see if anything odd falls out. -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab -- To unsubscribe from this list: send the line "unsubscribe linux-numa" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
