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Message-Id: <cover.1565594108.git.luoben@linux.alibaba.com>
Date: Mon, 12 Aug 2019 16:52:03 +0800
From: Ben Luo <luoben@...ux.alibaba.com>
To: tglx@...utronix.de, alex.williamson@...hat.com,
linux-kernel@...r.kernel.org
Cc: tao.ma@...ux.alibaba.com, gerry@...ux.alibaba.com,
nanhai.zou@...ux.alibaba.com, linyunsheng@...wei.com
Subject: [PATCH v2 0/3] introduce update_irq_devid and optimize VFIO irq ops
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 2 introduces update_irq_devid to only update dev_id of irqaction
Patch 3 make use of update_irq_devid and optimize irq operations in VFIO
changes from v1:
- add Patch 1 to enhance error recovery etc. in free irq per tglx's comments
- enhance error recovery code and debugging info in update_irq_devid
- use __must_check in external referencing of update_irq_devid
- use EXPORT_SYMBOL_GPL for update_irq_devid
- reformat code of patch 3 for better readability
Ben Luo (3):
genirq: enhance error recovery code in free irq
genirq: introduce update_irq_devid()
vfio_pci: make use of update_irq_devid and optimize irq ops
drivers/vfio/pci/vfio_pci_intrs.c | 99 +++++++++++++++++++++-------------
include/linux/interrupt.h | 3 ++
kernel/irq/manage.c | 111 +++++++++++++++++++++++++++++++++-----
3 files changed, 163 insertions(+), 50 deletions(-)
--
1.8.3.1
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