Xen Project 4.11 Acknowledgements

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

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

Name	Changesets	Lines Added	Lines Removed
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 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.
^{[ 8 ]} Includes backports to stable branches