From: Ben Luo <luoben@linux.alibaba.com>
To: tglx@linutronix.de, alex.williamson@redhat.com,
linux-kernel@vger.kernel.org
Cc: tao.ma@linux.alibaba.com, gerry@linux.alibaba.com
Subject: [PATCH 0/2] introduce update_irq_devid and optimize VFIO irq ops
Date: Thu, 8 Aug 2019 20:07:30 +0800 [thread overview]
Message-ID: <cover.1565263723.git.luoben@linux.alibaba.com> (raw)
Currently, VFIO takes a lot of free-then-request-irq actions whenever
a VM (with device passthru via VFIO) sets irq affinity or mask/unmask
irq. Those actions only change the cookie data of irqaction or even
change nothing. The free-then-request-irq not only add more latency,
but also increases the risk of losing interrupt, this may lead to a
VM hung forever in waiting IO completion
This patchset solved this issue by:
patch 1 introduces update_irq_devid to only update dev_id of irqaction
patch 2 make use of update_irq_devid and optimize irq operations in VFIO
Ben Luo (2):
genirq: introduce update_irq_devid()
vfio_pci: make use of update_irq_devid and optimize irq ops
drivers/vfio/pci/vfio_pci_intrs.c | 100 +++++++++++++++++++++++---------------
include/linux/interrupt.h | 3 ++
kernel/irq/manage.c | 74 ++++++++++++++++++++++++++++
3 files changed, 139 insertions(+), 38 deletions(-)
--
1.8.3.1
next reply other threads:[~2019-08-08 12:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-08 12:07 Ben Luo [this message]
2019-08-08 12:07 ` [PATCH 1/2] genirq: introduce update_irq_devid() Ben Luo
2019-08-08 19:56 ` Thomas Gleixner
2019-08-12 2:59 ` luoben
2019-08-08 12:07 ` [PATCH 2/2] vfio_pci: make use of update_irq_devid and optimize irq ops Ben Luo
2019-08-12 5:44 ` Yunsheng Lin
2019-08-12 6:37 ` luoben
2019-08-12 8:52 ` [PATCH v2 0/3] introduce update_irq_devid and optimize VFIO " Ben Luo
2019-08-12 8:52 ` [PATCH v2 1/3] genirq: enhance error recovery code in free irq Ben Luo
2019-08-12 8:52 ` [PATCH v2 2/3] genirq: introduce update_irq_devid() Ben Luo
2019-08-12 8:52 ` [PATCH v2 3/3] vfio_pci: make use of update_irq_devid and optimize irq ops Ben Luo
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