Xen Project 4.10 Acknowledgements

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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 107 202
Changesets (including backports) [ 8 ] 1948 1751
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 Sortable.gif icon besides the column header, to sort by a specific column.

Name Sortable.gif Lines Added Sortable.gif Lines Removed Sortable.gif Changesets Sortable.gif
Adrian Pop 7 1 1
Alexandru Isaila 170 114 3
Andre Przywara 2457 105 35
Andrew Cooper 7364 4278 187
Andrii Anisov 152 88 4
Anthony PERARD 109 46 6
Armando Vega 773 707 2
Artem Bityutskiy 10 10 1
Awais Masood 29 9 1
Bernd Kuhls 2 0 1
Bernhard M. Wiedemann 3 3 2
Bhupinder Thakur 1821 593 31
Boqun Feng 237 0 2
Boris Ostrovsky 734 199 20
Borislav Petkov 21 10 1
Chao Gao 132 53 7
Christopher Clark 91 17 3
Daniel De Graaf 4 2 1
Daniel Sabogal 1 1 1
Dario Faggioli 1686 392 31
David Esler 4 3 1
David Woodhouse 6 5 2
Dongli Zhang 147 0 3
Doug Goldstein 5 3 1
Dushyant Behl 6 6 1
Eric Chanudet 12 6 1
Euan Harris 85 23 3
Felix Schmoll 35 4 2
George Dunlap 1483 217 34
Gregory Herrero 12 3 1
Haozhong Zhang 1564 524 33
Ian Jackson 1777 625 88
Igor Druzhinin 114 52 3
Iurii Konovalenko 53 0 1
Jan Beulich 2950 2434 126
Jennifer Herbert 119 55 2
Joao Martins 710 0 2
Juergen Gross 1595 701 76
Julien Grall 2310 1872 114
Konrad Rzeszutek Wilk 62 42 7
Luwei Kang 41 4 1
Manish Jaggi 161 18 5
Marek Marczykowski-Górecki 245 151 7
Meng Xu 203 82 5
Min He 34 2 1
Olaf Hering 594 222 8
Oleksandr Grytsov 1359 812 14
Oleksandr Tyshchenko 15 2 2
Owen Smith 14 0 1
Paul Durrant 131 131 2
Pawel Wieczorkiewicz 2 0 1
Peter Große 3 3 2
Petre Pircalabu 741 110 8
Praveen Kumar 426 341 2
Punit Agrawal 47 21 4
Razvan Cojocaru 2 2 1
Roger Pau Monné 1526 922 55
Ross Lagerwall 264 14 6
Rusty Bird 16 9 1
Sergej Proskurin 1088 117 16
Sergey Dyasli 565 186 16
Simon Crowe 20 3 1
Simon Waterman 86 2 4
Stefano Stabellini 43 11 4
Stewart Hildebrand 3 2 1
Swapnil Paratey 538 34 2
Thomas Sanders 10 5 1
Tim Deegan 3 1 1
Vijaya Kumar K 53 0 1
Vitaly Kuznetsov 6 0 1
Vivek Kumar Chaubey 34 3 1
Volodymyr Babchuk 706 229 14
Wei Liu 15373 8426 180
Wolfram Strepp 17 23 3
Xiong Zhang 51 79 4
Yi Sun 2136 699 31
Yu Zhang 45 0 1
Zhang Bo 2 2 1
Zhang Xiliang 5 1 1
Zhongze Liu 58 4 2


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 Lines Added Sortable.gif Lines Removed Sortable.gif Changesets Sortable.gif
Alexey G 11 2 1
Alistair Francis 4 3 2
Annie Li 8 2 1
Anoob Soman 1 1 1
Anton Nefedov 2 2 2
Arnd Bergmann 5 8 2
Arvind Yadav 1 1 1
Bart Van Assche 22 38 7
Ben Chalmers 10 6 2
Bhumika Goyal 2 2 1
Boris Ostrovsky 5 3 1
Cherry G. Mathew 140 475 4
Christoph Hellwig 2 14 2
Christos Gkekas 0 3 1
Colin Ian King 1 1 1
David S. Miller 0 0 3
Dmitry Torokhov 0 0 1
Dongli Zhang 11 8 1
Eric Dumazet 1 1 1
Eric Mackay 386 121 2
Greg Kroah-Hartman 20 24 1
Greg Kurz 2 1 1
Gregory CLEMENT 21 4 1
Gustavo A. R. Silva 2 2 1
Hu Ziji 70 7 2
Ian Lepore 0 5 1
Igor Druzhinin 214 59 5
Jan Beulich 10 1 1
Jason A Harmening 0 1 1
Jens Axboe 0 0 2
Jérôme Glisse 0 8 1
Juergen Gross 104 95 5
Julien Grall 3 4 1
Junxiao Bi 1 1 1
Liang Yan 5 1 2
Linus Torvalds 0 0 29
Liu Shuo 1 1 1
Manuel Bouyer 3 3 1
Maxime Villard 75 132 15
Michal Hocko 1 1 1
Munehisa Kamata 3 3 1
Olaf Hering 1 1 1
Oleksandr Andrushchenko 179 40 1
Owen Smith 5250 5137 28
Paul Durrant 280 188 12
Peter Maydell 12 5 5
Peter Xu 20 5 3
Philippe Mathieu-Daudé 1 1 1
Punit Agrawal 0 1 1
Roger Pau Monné 45 10 3
Ross Lagerwall 11 0 1
Ryan Libby  2 2 1
Shawn Lin 0 2 1
Stefano Stabellini 1506 115 22
Thomas Gleixner 2 4 1
Tycho Andersen 0 10 1
Ulf Hansson 0 0 1
Vladimir Sementsov-Ogievskiy 17 17 2
Wengang Wang 8 1 1
Willem de Bruijn 2 2 1
Xiong Zhang 1 0 1
Zhoujie Wu 93 17 3


4.10 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 Sortable.gif
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.