Xen Project 4.11 Acknowledgements

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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 reduction in public code review activity, as well as development velocity. This figure is substantially skewed by a number of large and complex security related code series that were developed in private under security embargoes. 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. In addition, we ported many of these changes - including code that enabled these series - to older releases of Xen to uphold our maintenance and security guarantees.

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
222 days
139 dev window/days [ 6 ]
7.5 months
Development Velocity
Changesets 1250 1206 987 287 1493
Changesets (including backports) [ 8 ] 1751 1971
Series (=Features) [ 5 ] 525 406
Average Size of Feature 2.3 3.0
Changes / Day 7.2 5.4
Changes / Dev Day [ 6 ] 11.2 8.7
Features / Day [ 5 ] 3.0 3.4
Code Review Statistics
Review Comments [ 5 ] 6527 7058
Review Comments / Day [ 5 ] 37.8 31.8
Review Comments / Dev Day [ 6 ] 59.2 50.8
Comments / Series [ 5 ] 12.5 17.4
Code Churn
Lines Added 68199 42862 42862 8577 51439
Lines Removed 25777 16030 16030 6602 22632
Engagement
Individuals 80 62 62 78
Employers [ 7 ] 31 27 27 37


4.11 Hypervisor Only Code Contributions [ 1 ]

Breakdown by Individual

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

Name Sortable.gif Changesets Sortable.gif Lines Added Sortable.gif Lines Removed Sortable.gif
Alan Robinson 1 6 4
Alexandru Isaila 8 242 79
Amit Singh Tomar 3 357 1
Andre Przywara 68 4307 789
Andrew Cooper 246 8223 3683
Andrii Anisov 1 4 2
Anthony PERARD 6 107 53
Bob Moore 1 3 2
Boris Ostrovsky 5 115 54
Brian Woods 10 155 40
Bruno Alvisio 18 838 264
Daniel Kiper 5 26 11
Dario Faggioli 11 329 206
David E. Box 1 2 0
David Esler 1 5 5
David Wang 1 4 2
Doug Goldstein 16 556 1668
Euan Harris 1 4 26
George Dunlap 12 164 69
Gregory Herrero 1 12 4
Haozhong Zhang 3 12 7
Ian Jackson 181 2980 743
Igor Druzhinin 1 15 3
Jan Beulich 160 5663 2407
Jan H. Schoenherr 1 2 2
Jim Fehlig 1 4 1
Joe Jin 1 5 3
John Thomson 2 3 3
Jon Ludlam 2 197 117
Juergen Gross 28 1394 832
Julien Grall 99 2549 1619
Lars Kurth 3 572 13
Liran Alon 1 3 1
Maran Wilson 1 62 1
Marcello Seri 3 36 37
Marek Marczykowski-Górecki 10 80 16
Michael Young 4 75 73
Michel Lespinasse 14 544 372
Olaf Hering 10 30 20
Oleksandr Andrushchenko 11 366 44
Oleksandr Grytsov 4 248 260
Oleksandr Tyshchenko 1 1 1
Paul Durrant 19 1421 737
Paul Semel 2 8 3
Petre Eftime 1 1 1
Razvan Cojocaru 4 293 40
Roger Pau Monne 121 7116 876
Ross Lagerwall 9 249 84
Sameer Goel 1 2 2
Sergey Dyasli 8 653 38
Simon Gaiser 3 14 12
Stefano Stabellini 11 258 58
Stewart Hildebrand 2 4 3
Tom Lendacky 1 4 0
Uwe Dannowski 1 3 2
Wei Liu 45 1028 190
Wei Yang 1 1 1
Wolfram Strepp 1 4 4
Xen Project Security Team 1 95 31
Yi Sun 16 1393 408
Zhenzhong Duan 1 0 3
Zhongze Liu 1 15 0


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

Breakdown by Individual

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

Name Sortable.gif Changesets Sortable.gif Lines Added Sortable.gif Lines Removed Sortable.gif
Al Viro 1 1 1
Alistair Francis 2 18 16
Andrew Turner 1 1 1
Andy Shevchenko 1 1 3
Arnd Bergmann 2 7 9
Arvind Yadav 1 4 1
Bart Van Assche 1 5 5
Ben Chalmers 1 2 2
Bhavesh Davda 1 8 9
Bjorn Helgaas 5 3 2
Boris Ostrovsky 3 84 11
Manuel Bouyer 2 32 11
Cherry G. Mathew 1 6 6
Chris Patterson 1 6 1
Christoph Hellwig 2 2 16
Christos Zoulas 6 51 196
Colin Ian King 2 2 2
Dan Carpenter 6 12 10
Daniel Vetter 1 1 7
Dave Airlie 1 0 0
David Gibson 2 15 15
David S. Miller 7 0 0
Eduardo Habkost 2 7 7
Eduardo Otubo 1 1 0
Ed Maste 1 4 4
Frederick Lawler 1 9 10
Greg Kurz 2 2 3
Huang Ying 1 4 0
Ian Jackson 6 58 74
Igor Druzhinin 3 34 23
Jan Beulich 1 1 1
Jason Andryuk 1 6 1
Jaromír Doleček 9 457 179
Jeff Roberson 3 6 6
Jens Axboe 1 0 0
Jia-Ju Bai 5 5 5
Joao Martins 2 29 0
Joe Jin 1 1 1
Joe Perches 6 22 25
Juergen Gross 2 225 3
Kees Cook 5 29 22
Konstantin Belousov 1 53 2
Robert Elz 1 5 4
Linus Torvalds 38 12 12
Luc Van Oostenryck 1 1 1
Maarten Lankhorst 1 0 0
Marc-Andre Lureau 1 2 2


4.11 Hypervisor Reviewers [ 5 ]

This table is sortable : please click on the Sortable.gif 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 Sortable.gif Review Comments (excludes replies to own series) Sortable.gif
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.
[ 8 ] Includes backports to stable branches