[RFC PATCH 0/7] genirq/affinity: abstract new API from managed irq affinity spread

Ming Lei <ming.lei@xxxxxxxxxx> · Mon, 19 Jul 2021 17:57:22 +0800

Hello,

irq_build_affinity_masks() actually grouping CPUs evenly into each managed
irq vector according to NUMA and CPU locality, and it is reasonable to abstract
one generic API for grouping CPUs evenly, the idea is suggested by Thomas
Gleixner.

group_cpus_evenly() is abstracted and put into lib/, so blk-mq can re-use
it to build default queue mapping.

Please comments!

Thanks,

Ming Lei (7):
  genirq/affinity: remove the 'firstvec' parameter from
    irq_build_affinity_masks
  genirq/affinity: pass affinity managed mask array to
    irq_build_affinity_masks
  genirq/affinity: don't pass irq_affinity_desc array to
    irq_build_affinity_masks
  genirq/affinity: rename irq_build_affinity_masks as group_cpus_evenly
  genirq/affinity: move group_cpus_evenly() into lib/
  lib/group_cpus: allow to group cpus in case of !CONFIG_SMP
  blk-mq: build default queue map via group_cpus_evenly()

 block/blk-mq-cpumap.c      |  64 ++----
 include/linux/group_cpus.h |  28 +++
 kernel/irq/affinity.c      | 404 +-----------------------------------
 lib/Makefile               |   2 +
 lib/group_cpus.c           | 413 +++++++++++++++++++++++++++++++++++++
 5 files changed, 465 insertions(+), 446 deletions(-)
 create mode 100644 include/linux/group_cpus.h
 create mode 100644 lib/group_cpus.c

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2.31.1