On 06/16/2015 07:56 AM, Srikar Dronamraju wrote:
> In task_numa_migrate(), while evaluating other nodes for group
> consolidation, env.dst_nid is used instead of using the iterator nid.
> Using env.dst_nid would mean dist is always the same. Infact the same
> dist was calculated above while evaluating the preferred node.
>
> Fix the above to use the iterator nid.
Good catch.
> Also the task/group weights from the src_nid should be calculated
> irrespective of numa topology type.
If you look at score_nearby_nodes(), you will see that
maxdist is only used when the topology is NUMA_BACKPLANE.
The source score never changes when having a directly
connected or NUMA_GLUELESS_MESH type system, so the source
score does not need to be recalculated unless we are actually
dealing with a NUMA_BACKPLANE topology.
Looking forward to a v2 with just the first fix.
> Signed-off-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
> ---
> kernel/sched/fair.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index d1aa374..e1b3393 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -1493,9 +1493,8 @@ static int task_numa_migrate(struct task_struct *p)
> if (nid == env.src_nid || nid == p->numa_preferred_nid)
> continue;
>
> - dist = node_distance(env.src_nid, env.dst_nid);
> - if (sched_numa_topology_type == NUMA_BACKPLANE &&
> - dist != env.dist) {
> + dist = node_distance(env.src_nid, nid);
> + if (dist != env.dist) {
> taskweight = task_weight(p, env.src_nid, dist);
> groupweight = group_weight(p, env.src_nid,
> dist);
> }
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
