From: Ben Luo <luoben@linux.alibaba.com>
To: tglx@linutronix.de, alex.williamson@redhat.com
Cc: linux-kernel@vger.kernel.org, tao.ma@linux.alibaba.com,
gerry@linux.alibaba.com, nanhai.zou@linux.alibaba.com,
linyunsheng@huawei.com
Subject: [PATCH v3 0/3] genirq/vfio: Introduce update_irq_devid and optimize VFIO irq ops
Date: Thu, 15 Aug 2019 21:02:58 +0800 [thread overview]
Message-ID: <cover.1565857737.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 adds more latency,
but also increases the risk of losing interrupt, which may lead to a
VM hung forever in waiting for IO completion
This patchset solved the 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 v2:
- reformat to avoid quoted string split across lines and etc.
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 | 101 +++++++++++++++++++++-------------
include/linux/interrupt.h | 3 ++
kernel/irq/manage.c | 110 +++++++++++++++++++++++++++++++++-----
3 files changed, 164 insertions(+), 50 deletions(-)
--
1.8.3.1
next reply other threads:[~2019-08-15 13:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-15 13:02 Ben Luo [this message]
2019-08-15 13:02 ` [PATCH v3 1/3] genirq: enhance error recovery code in free irq Ben Luo
2019-08-15 14:20 ` Thomas Gleixner
2019-08-15 13:03 ` [PATCH v3 2/3] genirq: introduce update_irq_devid() Ben Luo
2019-08-15 14:58 ` Thomas Gleixner
2019-08-19 5:31 ` luoben
2019-08-19 8:18 ` Thomas Gleixner
2019-08-15 13:03 ` [PATCH v3 3/3] vfio_pci: make use of update_irq_devid and optimize irq ops Ben Luo
2019-08-15 16:45 ` Thomas Gleixner
[not found] ` <7a3606ad-8fa6-45d5-b5a4-ee3f07893a25@linux.alibaba.com>
2019-08-20 15:27 ` Liu, Jiang
2019-08-22 13:41 ` luoben
2019-08-19 20:51 ` [PATCH v3 0/3] genirq/vfio: Introduce update_irq_devid and optimize VFIO " Alex Williamson
2019-08-20 4:03 ` luoben
2019-08-20 15:22 ` Alex Williamson
2019-08-20 15:51 ` luoben
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