Xen Project 4.10 Acknowledgements

Note that the acknowledgements have been created based on 4.10.0-rc7, which are provisional. The table assumes we release on December 13th, 2017 based on 4.10.0-rc7 including some security fixes that are currently under embargo. These fixes are not included in these statistics.

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 4.9 with Xen 4.10. 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 4.10 Hypervisor Total.

Attribute	4.9 Hypervisor Total [ 1 ]	4.10 Hypervisor Total [ 1 ]	4.10 Hypervisor Core [ 2 ]	4.10 Hypervisor Other [ 3 ]	Drivers and Devices (other projects) [ 4 ]
Release Cycle	203 days 128 dev window/days [ 6 ] 6.3 months	174 days [ 7 ] 111 dev window/days [ 6 ] 5.9 months
Development Velocity
Changesets	1549	1250	1143	107	164
Series (=Features) [ 5 ]	807	525
Average Size of Feature	3.2	2.4
Changes / Day	7.6	7.2 (-6.2%)
Changes / Dev Day [ 6 ]	12.1	11.2 (-7.5%)
Features / Day [ 5 ]	4.0	3.0
Code Review Statistics
Review Comments [ 5 ]	8349	6527
Review Comments / Day [ 5 ]	41.1	37.8 (-8.9%)
Review Comments / Dev Day [ 6 ]	65.2	59.2 (-10.2%)
Comments / Series [ 5 ]	17.4	12.5 (-38.7%)
Code Churn
Lines Added	82336	68199 (-20.7%)	44135	24064	8577
Lines Removed	47014	25777 (-82.4%)	23965	1812	6602
Engagement
Individuals	85	80 (-7.5%)
Employers [ 8 ]	29	31 (+6.5%)

4.10 Hypervisor Only Code Contributions ^{[ 2 ]}

Breakdown by Individual

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

Note that names from e-mail addresses from the FreeBSD and NetBSD communities have not resolved properly

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

4.10 Hypervisor Reviewers ^{[ 5 ]}

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
314 others (less than 10 review comments each)	534
Alexandru Stefan	15
Andre Przywara	42
Andrew Cooper	388
Anthony Perard	44
Boris Ostrovsky	239
Brian Gerst	10
Bruce Richardson	10
Chao Gao	39
Chao P Peng	19
Daniel De Graaf	26
Daniel Kiper	24
Dario Faggioli	97
Dongli Zhang	13
Dou Liyang	13
Doug Goldstein	15
George Dunlap	17
Govinda Tatti	13
Haozhong Zhang	13
Ian Jackson	247
Igor Druzhinin	22
Ingo Molnar	10
Jan Beulich	1167
Jiri Slaby	13
Joao M Martins	16
Josh Poimboeuf	16
Juergen Gross	527
Julien Grall	429
Kevin Tian	76
Konrad Wilk	100
Manish Jaggi	16
Marek Marczykowski-Górecki	17
Meng Xu	22
Olaf Hering	43
Oleksandr Andrushchenko	10
Oleksandr Grytsov	53
Oleksandr Tyshchenko	21
Paolo Bonzini	11
Paul Durrant	207
Peter Zijlstra	11
Petre Pircalabu	23
Praveen Kumar	10
Razvan Cojocaru	43
Roger Pau Monne	357
Ross Lagerwall	26
Sergej Proskurin	50
Sergey Dyasli	21
Stefano Stabellini	439
Tamas K Lengyel	52
Thomas Gleixner	15
Thomas Lendacky	10
Tianyu Lan	52
Tim Deegan	22
Venu Busireddy	11
Volodymyr Babchuk	35
Waiman Long	14
Wei Chen	14
Wei Liu	698
Yi Y Sun	123
Zhongze Liu	21

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 ]} Calculated using 4.10.0-rc7. Note that the code freeze for this release was 4 weeks longer than expected, due to several security issues being fixed towards the end of the release cycle and were held under embargo.
^{[ 8 ]} Only known employers are used. Unknown employers were discounted.