linux-kernel - [PATCH v3 0/3] xen-blk(back|front): Let users disable persistent grants

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Message-ID: <20200922141549.26154-1-sjpark@amazon.com>
Date:   Tue, 22 Sep 2020 16:15:46 +0200
From:   SeongJae Park <sjpark@...zon.com>
To:     <konrad.wilk@...cle.com>, <roger.pau@...rix.com>, <jgross@...e.com>
CC:     SeongJae Park <sjpark@...zon.de>, <axboe@...nel.dk>,
        <aliguori@...zon.com>, <amit@...nel.org>, <mheyne@...zon.de>,
        <pdurrant@...zon.co.uk>, <linux-block@...r.kernel.org>,
        <xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 0/3] xen-blk(back|front): Let users disable persistent grants

From: SeongJae Park <sjpark@...zon.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_v3

The web is also available:
https://github.com/sjp38/linux/tree/pgrants_disable_v3

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

Changes from v2
(https://lore.kernel.org/linux-block/20200922105209.5284-1-sjpark@amazon.com/)
- Avoid race conditions (Roger Pau Monné)

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            | 22 ++++++++++++++-----
 drivers/block/xen-blkfront.c                  | 20 ++++++++++++-----
 4 files changed, 50 insertions(+), 12 deletions(-)

-- 
2.17.1