[SRU][Zesty][PATCH 0/1] Revert "vhost: cache used event for better performance"

[Joseph Salisbury]

BugLink: http://bugs.launchpad.net/bugs/1711251

== SRU Justification ==
A vhost performance patch was introduced in the 4.10 kernel upstream, and 
is currently included in the Zesty 4.10 kernel:

commit 809ecb9bca6a9424ccd392d67e368160f8b76c92
Author: Jason Wang <jasowang at redhat.com>
Date: Mon Dec 12 14:46:49 2016 +0800

    vhost: cache used event for better performance

However IBM recently hit a functional issue linked to this patch which 
would cause random guests to lose their network connection under stress. 
This is not architecture specific and more likely to be hit with high 
network stress (i.e. lots of uperf instances).

The patch author has now reverted this patch upstream:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/vhost?id=8d65843c44269c21e95c98090d9bb4848d473853

== Fix ==
Revert of upstream commit 809ecb9bca6a9424ccd392d67e368160f8b76c92.

== Test Case ==
A test kernel was built with this revert and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.


Joseph Salisbury (1):
  Revert "vhost: cache used event for better performance"

 drivers/vhost/vhost.c | 28 ++++++----------------------
 drivers/vhost/vhost.h |  3 ---
 2 files changed, 6 insertions(+), 25 deletions(-)

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2.7.4