Xen Project 4.9 Acknowledgements

Note that the acknowledgements have been created based on 4.9.0-rc7, which is expected to be the final RC for Xen 4.9.0 (with the exception of some security fixes under embargo). If there is another release candidate, data needs to be updated.

Overview

As we have made significant changes to the xen source tree structure, we will count acknowledgements in line with RFC Xen 4.6 Acknowledgements.

The following table compares Xen 4.8 with Xen 4.9. We also cover changes to Xen only components in Linux, FreeBSD, NetBSD and QEMU in the "Drivers and Devices" column, which are primarily made by Xen Project developers. Note that the number is not part of the 4.9 Hypervisor Total.

Attribute	4.8 Hypervisor Total [ 1 ]	4.9 Hypervisor Total [ 1 ]	4.9 Hypervisor Core[ 2 ]	4.9 Hypervisor Other [ 3 ]	Drivers and Devices (other projects)[ 4 ]
Release Cycle	161 days 124 dev window/days[ 6 ] 5.3 months	176 days [ 7 ]</sup 128 dev window/days[ 6 ] 5.9 months
Development Velocity
Changesets	1245	1500 (+17.0%)	1275	225	TBD
Series (=Features) [ 5 ]	575	470 (-22.3%)
Average Size of Feature	2.17	3.19 (+32%)
Changes / Day	7.7	8.5 (+8.7%)
Changes / Dev Day [ 6 ]	10.0	11.7 (+14.7%)
Features / Day [ 5 ]	3.6	2.7 (-34.8%)
Code Review Statistics
Review Comments [ 5 ]	6960	7374 (+5.6%)
Review Comments / Day [ 5 ]	43.6	41.9 (-4.1%)
Comments / Series [ 5 ]	11.9	15.7 (+24.2%)
Code Churn
Lines Added	78899	80728	75763	4965	TBD
Lines Removed	62325	46291	44726	1565	TBD
Engagement
Individuals	68	84	82	10	TBD
Employers [ 8 ]	TBD	28	27	6	TBD

4.9 Hypervisor Only Code Contributions ^{[ 2 ]}

Breakdown by Individual

To Do: Insert data - will have to do this post the 4.9 release

This table is sortable : please click on the icon besides the column header, to sort by a specific column.

Name	Lines Added	Lines Removed	Changesets

4.9 Hypervisor Related Code Contributions ^{[ 3 ]}

Breakdown by Individual

Note that the table below does not cover contributions to Linux, NetBSD, FreeBSD, QEMU, libvirt and other related projects. It lists contributors to mini-os (formerly part of xen.git), osstest (our test code and test cases), raisin (a deployment and test tool), xtf.git and livepatch-build-tools (tools to builld livepatch payloads).

This table is sortable : please click on the icon besides the column header, to sort by a specific column.

Name	Lines Added	Lines Removed	Changesets

Code Contributions to Xen Related Drivers and Devices in Linux, NetBSD, FreeBSD ^{[ 4 ]}

Breakdown by Individual

To Do: Insert data - will have to do this post the 4.9 release

This table is sortable : please click on the icon besides the column header, to sort by a specific column.

Name	Lines Added	Lines Removed	Changesets

4.9 Hypervisor Reviewers ^{[ 5 ]}

To Do: Insert data - will have to do this post the 4.9 release

This table is sortable : please click on the icon besides the column header, to sort by a specific column. Note that in the table below, we only count review comments by community members other than comments by the author of a patch. We do not count replies and clarifications by the author of a patch that are made in response to review comments by others.

Name	Review Comments

Footnotes

^{[ 1 ]} Includes the following repos: xen, mini-os, osstest, raisin, livepatch-build-tools, xtf
^{[ 2 ]} Includes the following repos: xen
^{[ 3 ]} Includes the following repos: mini-os, osstest, raisin, livepatch-build-tools, xtf
^{[ 4 ]} Includes commits to the following Xen specific directories of the following upstream projects: linux: arch/*/xen/ arch/*/include/asm/xen/ drivers/xen/ drivers/*/*xen* include/xen/ arch/*/pci/*xen* ; netbsd: sys/arch/xen; freebsd: sys/dev/xen/ sys/x86/xen sys/xen/; qemu: xen* hw/i386/xen hw/xenpv hw/*/xen* hw/xen include/*/xen*, xen windows pv drivers
^{[ 5 ]} This data was extracted from the Xen Project Code Review Dashboard
^{[ 6 ]} These are the days/months during which we were not in code freeze
^{[ 7 ]} Calculates using 4.9.0-rc7