On 27/12/2022 02:28, Ming Lei wrote:
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. blk-mq IO perf data is observed as more stable, meantime with big improvement, see detailed data in the last patch. Please consider it for v6.3!
Just wondering could this be a better alternative for some drivers than using cpumask_local_spread()?
Thanks, John
