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Subject[PATCH v2 0/3] xen-blk(back|front): Let users disable persistent grants
Date
From: SeongJae Park <sjpark@amazon.de>

Persistent grants feature provides high scalability. On some small
systems, however, it could incur data copy overheads[1] and thus it is
required to be disabled. But, there is no option to disable it. For
the reason, this commit adds module parameters for disabling of the
feature.

[1] https://wiki.xen.org/wiki/Xen_4.3_Block_Protocol_Scalability

Baseline and Complete Git Trees
===============================

The patches are based on the v5.9-rc6. You can also clone the complete
git tree:

$ git clone git://github.com/sjp38/linux -b pgrants_disable_v2

The web is also available:
https://github.com/sjp38/linux/tree/pgrants_disable_v2

Patch History
=============

Changes from v1
(https://lore.kernel.org/linux-block/20200922070125.27251-1-sjpark@amazon.com/)
- use 'bool' parameter type (Jürgen Groß)
- Let blkfront can also disable the feature from its side
(Roger Pau Monné)
- Avoid unnecessary xenbus_printf (Roger Pau Monné)
- Update frontend parameter doc

SeongJae Park (3):
xen-blkback: add a parameter for disabling of persistent grants
xen-blkfront: add a parameter for disabling of persistent grants
xen-blkfront: Apply changed parameter name to the document

.../ABI/testing/sysfs-driver-xen-blkback | 9 ++++++
.../ABI/testing/sysfs-driver-xen-blkfront | 11 +++++++-
drivers/block/xen-blkback/xenbus.c | 28 ++++++++++++++-----
drivers/block/xen-blkfront.c | 28 +++++++++++++------
4 files changed, 60 insertions(+), 16 deletions(-)

--
2.17.1

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