[openstack-dev] [Nova] Grant FFE to "Host-state level locking" BP

Cheng, Yingxin yingxin.cheng at intel.com
Fri Mar 4 13:56:10 UTC 2016

I'll make sure to deliver the patches if FFE is granted.


On Friday, March 4, 2016 6:56 PM Nikola Đipanov wrote:
> Hi,
> The actual BP that links to the approved spec is here: [1] and 2 outstanding
> patches are [2][3].
> Apart from the usual empathy-inspired reasons to allow this (code's been up for
> a while, yet only had real review on the last day etc.) which are not related to
> the technical merit of the work, there is also the fact that two initial patches
> that add locking around updates of the in-memory host map ([4] and [5]) have
> already been merged.
> They add the overhead of locking to the scheduler, but without the final work
> they don't provide any benefits (races will not be detected, without [2]).
> I don't have any numbers on this but the result is likely that we made things
> worse, for the sake of adhering to random and made-up dates. With this in mind
> I think it only makes sense to do our best to merge the 2 outstanding patches.
> Cheers,
> N.
> [1]
> https://blueprints.launchpad.net/openstack/?searchtext=host-state-level-
> locking
> [2] https://review.openstack.org/#/c/262938/
> [3] https://review.openstack.org/#/c/262939/
> [4] https://review.openstack.org/#/c/259891/
> [5] https://review.openstack.org/#/c/259892/

More information about the OpenStack-dev mailing list