Hi,

Implement and expose CPU spread API based on the scheduler's
sched_numa_find_closest().  Use it in mlx5 and enic device drivers.  This
replaces the binary NUMA preference (local / remote) with an improved one
that minds the actual distances, so that remote NUMAs with short distance
are preferred over farther ones.

This has significant performance implications when using NUMA-aware
memory allocations, improving the throughput and CPU utilization.

Regards,
Tariq

v3:
- Introduce the logic as a common API instead of being mlx5 specific.
- Add implementation to enic device driver.
- Use non-atomic version of __cpumask_clear_cpu.

v2:
- Replace EXPORT_SYMBOL with EXPORT_SYMBOL_GPL, per Peter's comment.
- Separate the set_cpu operation into two functions, per Saeed's suggestion.
- Add Saeed's Acked-by signature.


Tariq Toukan (3):
  sched/topology: Add NUMA-based CPUs spread API
  net/mlx5e: Improve remote NUMA preferences used for the IRQ affinity
    hints
  enic: Use NUMA distances logic when setting affinity hints

 drivers/net/ethernet/cisco/enic/enic_main.c  | 10 +++-
 drivers/net/ethernet/mellanox/mlx5/core/eq.c |  5 +-
 include/linux/sched/topology.h               |  4 ++
 kernel/sched/topology.c                      | 49 ++++++++++++++++++++
 4 files changed, 64 insertions(+), 4 deletions(-)

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2.21.0