linux-kernel - [PATCH 0/4] genirq/nvme: add IRQF_RESCUE

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Date:   Tue, 27 Aug 2019 16:53:40 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, Ming Lei <ming.lei@...hat.com>,
        Long Li <longli@...rosoft.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        John Garry <john.garry@...wei.com>,
        Hannes Reinecke <hare@...e.com>,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org
Subject: [PATCH 0/4] genirq/nvme: add IRQF_RESCUE_THREAD for avoiding IRQ flood

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@...rosoft.com>
Cc: Ingo Molnar <mingo@...hat.com>,
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Keith Busch <keith.busch@...el.com>
Cc: Jens Axboe <axboe@...com>
Cc: Christoph Hellwig <hch@....de>
Cc: Sagi Grimberg <sagi@...mberg.me>
Cc: John Garry <john.garry@...wei.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Hannes Reinecke <hare@...e.com>
Cc: linux-nvme@...ts.infradead.org
Cc: linux-scsi@...r.kernel.org


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