[PATCH 0/4] genirq/nvme: add IRQF_RESCUE_THREAD for avoiding IRQ flood

[Ming Lei]

Hi Guys,

The 1st patch implements one simple EWMA based mechanism for detecting IRQ flood.

The 2nd patch adds IRQF_RESCUE_THREAD, and interrupts will be handled in
the created rescue thread in case that IRQ flood comes.

The 3rd patch applies the flag of IRQF_RESCURE_THREAD for NVMe.

The last patch uses irq's affinity in case of IRQF_RESCUE_THREAD.

Please review & comment!

Long, please test and see if your issue can be fixed.

Ming Lei (4):
  softirq: implement IRQ flood detection mechanism
  genirq: add IRQF_RESCUE_THREAD
  nvme: pci: pass IRQF_RESCURE_THREAD to request_threaded_irq
  genirq: use irq's affinity for threaded irq with IRQF_RESCUE_THREAD

 drivers/base/cpu.c        | 25 +++++++++++++++++++++
 drivers/nvme/host/pci.c   | 17 +++++++++++++--
 include/linux/hardirq.h   |  2 ++
 include/linux/interrupt.h |  6 +++++
 kernel/irq/handle.c       |  6 ++++-
 kernel/irq/manage.c       | 25 ++++++++++++++++++++-
 kernel/softirq.c          | 46 +++++++++++++++++++++++++++++++++++++++
 7 files changed, 123 insertions(+), 4 deletions(-)

Cc: Long Li <longli@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>,
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Sagi Grimberg <sagi@xxxxxxxxxxx>
Cc: John Garry <john.garry@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: linux-nvme@xxxxxxxxxxxxxxxxxxx
Cc: linux-scsi@xxxxxxxxxxxxxxx


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