From: Daniel Wagner <[email protected]> Multiqueue drivers spread I/O queues across all CPUs for optimal performance. However, these drivers are not aware of CPU isolation requirements and will distribute queues without considering the isolcpus configuration.
Introduce a new isolcpus mask that allows users to define which CPUs should have I/O queues assigned. This is similar to managed_irq, but intended for drivers that do not use the managed IRQ infrastructure Reviewed-by: Hannes Reinecke <[email protected]> Reviewed-by: Aaron Tomlin <[email protected]> Signed-off-by: Daniel Wagner <[email protected]> --- include/linux/sched/isolation.h | 1 + kernel/sched/isolation.c | 7 +++++++ 2 files changed, 8 insertions(+) diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index dc3975ff1b2e..7b266fc2a405 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -18,6 +18,7 @@ enum hk_type { HK_TYPE_MANAGED_IRQ, /* Inverse of boot-time nohz_full= or isolcpus=nohz arguments */ HK_TYPE_KERNEL_NOISE, + HK_TYPE_IO_QUEUE, HK_TYPE_MAX, /* diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c index ef152d401fe2..3406e3024fd4 100644 --- a/kernel/sched/isolation.c +++ b/kernel/sched/isolation.c @@ -16,6 +16,7 @@ enum hk_flags { HK_FLAG_DOMAIN = BIT(HK_TYPE_DOMAIN), HK_FLAG_MANAGED_IRQ = BIT(HK_TYPE_MANAGED_IRQ), HK_FLAG_KERNEL_NOISE = BIT(HK_TYPE_KERNEL_NOISE), + HK_FLAG_IO_QUEUE = BIT(HK_TYPE_IO_QUEUE), }; DEFINE_STATIC_KEY_FALSE(housekeeping_overridden); @@ -340,6 +341,12 @@ static int __init housekeeping_isolcpus_setup(char *str) continue; } + if (!strncmp(str, "io_queue,", 9)) { + str += 9; + flags |= HK_FLAG_IO_QUEUE; + continue; + } + /* * Skip unknown sub-parameter and validate that it is not * containing an invalid character. -- 2.51.0
