* Laurent Vivier <lviv...@redhat.com> [2019-03-15 12:12:45]: > > Another way to avoid the nodes overlapping for the offline nodes at > startup is to ensure the default values don't define a distance that > merge all offline nodes into node 0. > > A powerpc specific patch can workaround the kernel crash by doing this: > > diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c > index 87f0dd0..3ba29bb 100644 > --- a/arch/powerpc/mm/numa.c > +++ b/arch/powerpc/mm/numa.c > @@ -623,6 +623,7 @@ static int __init parse_numa_properties(void) > struct device_node *memory; > int default_nid = 0; > unsigned long i; > + int nid, dist; > > if (numa_enabled == 0) { > printk(KERN_WARNING "NUMA disabled by user\n"); > @@ -636,6 +637,10 @@ static int __init parse_numa_properties(void) > > dbg("NUMA associativity depth for CPU/Memory: %d\n", > min_common_depth); > > + for (nid = 0; nid < MAX_NUMNODES; nid ++) > + for (dist = 0; dist < MAX_DISTANCE_REF_POINTS; dist++) > + distance_lookup_table[nid][dist] = nid; > +
The only reason, this would have worked in the specific case, is because we are overriding the distance_lookup_table with a unique distance. So node_distance for any other node other than itself will return max distance which is 40 in this case. (since distance_ref_points_depth is 2) I am not sure if this will work if the node distance between the two nodes happens to be 20. > /* > * Even though we connect cpus to numa domains later in SMP > * init, we need to know the node ids now. This is because > -- Thanks and Regards Srikar Dronamraju