Xen Project 4.11 Acknowledgements

To Do: The data is based on staging, snapshot June 18, 2018.

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 4.10 with Xen 4.11. 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 4.11 Hypervisor Total.

Note: The data below shows a significant reduction in code review activity. This figure is substantially skewed by a number of large and complex security related being series developed in private under NDAs. In other words, the reduction signifies that we are doing fewer public reviews to satisfy requirements that allow project members to fix issues under security embargoes.

Attribute	4.10 Hypervisor Total [ 1 ]	4.11 Hypervisor Total [ 1 ]	4.11 Hypervisor Core [ 2 ]	4.11 Hypervisor Other [ 3 ]	Drivers and Devices (other projects) [ 4 ]
Release Cycle	174 days 111 dev window/days [ 6 ] 5.9 months	201 days 129 dev window/days [ 6 ] 6.8 months
Development Velocity
Changesets	1250	1793 (+30.3%)	TODO	TODO	TODO
Series (=Features) [ 5 ]	525	676
Average Size of Feature	2.3	2.7
Changes / Day	7.2	8.9 (+19.5%)
Changes / Dev Day [ 6 ]	11.2	12.9 (+12.7%)
Features / Day [ 5 ]	3.0	3.4
Code Review Statistics
Review Comments [ 5 ]	6527	4525
Review Comments / Day [ 5 ]	37.8	22.5 (-67.8%)
Review Comments / Dev Day [ 6 ]	59.2	32.6 (-81.9%)
Comments / Series [ 5 ]	12.5	6.7 (-87.0%%)
Code Churn
Lines Added	68199	65300	TODO	TODO	TODO
Lines Removed	25777	21560	TODO	TODO	TODO
Engagement
Individuals	80	TODO (TODO%)
Employers [ 7 ]	31	TODO (TODO%)

4.11 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

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

4.11 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 (excludes replies to own series)
240 others (less than 10 review comments each)	555
Jan Beulich	1,177
Andrew Cooper	618
Julien Grall	554
Roger Pau Monne	395
Wei Liu	376
Stefano Stabellini	354
Juergen Gross	282
Boris Ostrovsky	226
Oleksandr Andrushchenko	215
George Dunlap	190
Paul Durrant	142
Andre Przywara	100
Ian Jackson	136
Razvan Cojocaru	68
Kevin Tian	66
Konrad Wilk	56
Tamas K Lengyel	51
Dario Faggioli	50
Mirela Simonovic	50
Daniel Kiper	45
Olaf Hering	45
Chao Gao	41
Alexandru Isaila	39
Anthony Perard	39
Lars Kurth	38
Volodymyr Babchuk	37
Doug Goldstein	34
Paul Semel	29
Manish Jagg	28
Anthony Liguori	26
Michael Tsirkin	26
Takashi Iwai	25
Tim Deegan	23
Simon Gaiser	22
Daniel Vetter	21
Ross Lagerwall	21
Marek Marczykowski	19
Daniel Berrange	18
Sky Liu	15
Govinda Tatti	15
Alexey Gerasimenk	15
Oleksandr Grytsov	14
Igor Druzhinin	14
Maran Wilson	14
Marc Zyngier	14
Ingo Molnar	14
Christian Lindig	13
Brian Woods	12
Sergey Dyasli	12
Andrii Anisov	11
Dmitry Torokhov	11
Dongwon Kim	11
Natarajan Janakarajan	11
homas Garnier	11
Volodymyr Babchuk	11
Zhenzhong Duan	11
Arnd Bergmann	10
David Woodhouse	10
Eric Blak	10
Zhouyang Jia	10

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 ]} Only known employers are used. Unknown employers were discounted.