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Subject[PATCH V3 0/3] genriq/affinity: Make vectors allocation fair

The 1st patch enhances one warning check.

The 2nd patch makes __irq_build_affinity_masks() more reliable, such as,
all nodes can be covered in the spread.

The 3rd patch spread vectors on node according to the ratio of this node's
CPU number to number of all remaining CPUs, then vectors assignment can
become more fair. Meantime, the warning report from Jon Derrick can be

Please review & comment!

- re-order the patchset
- add helper of irq_spread_vectors_on_node()
- handle vector spread correctly in case that numvecs is > ncpus
- return -ENOMEM to API's caller

- add patch3
- start to allocate vectors from node with minimized CPU number,
then every node is guaranteed to be allocated at least one vector.
- avoid cross node spread

Ming Lei (3):
genirq/affinity: Enhance warning check
genirq/affinity: Improve __irq_build_affinity_masks()
genirq/affinity: Spread vectors on node according to nr_cpu ratio

kernel/irq/affinity.c | 191 ++++++++++++++++++++++++++++++++++--------
1 file changed, 158 insertions(+), 33 deletions(-)

Cc: Jens Axboe <>
Cc: Christoph Hellwig <>
Cc: Keith Busch <>
Cc: Jon Derrick <>

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