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	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 icon besides the column header, to sort by a specific column.

Name	Lines Added	Lines Removed	Changesets
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 icon besides the column header, to sort by a specific column.

Name	Lines Added	Lines Removed	Changesets
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 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.