Xen Project 4.8 Acknowledgements

Note that the Acknowledgements have been created based on 4.8.0-rc8, which was the final RC for Xen 4.8.0.

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 4.7 with Xen 4.8. 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 4.8 Hypervisor Total.

Attribute	4.7 Hypervisor Total [ 1 ]	4.8 Hypervisor Total [ 1 ]	4.8 Hypervisor Core[ 2 ]	4.8 Hypervisor Other [ 3 ]	Drivers and Devices (other projects)[ 4 ]
Release Cycle	255 days 197 dev window/days[ 6 ] 8.4 months	161 days 124 dev window/days[ 6 ] 5.3 months
Development Velocity
Changesets	1887	1245	967	278	321
Series (=Features) [ 5 ]	1025	575
Average Size of Feature	1.84	2.17 (+15%)
Changes / Day	7.5	7.7 (+3%)
Changes / Dev Day [ 6 ]	9.6	10.0 (+4%)
Features / Day [ 5 ]	4.0	3.6 (-11%)
Code Review Statistics
Review Comments [ 5 ]	11628	6950
Review Comments / Day [ 5 ]	45.6	43.2 (-6%)
Comments / Series [ 5 ]	11.3	12.1 (+7%)
Code Churn
Lines Added	106606	78899	70833	8066	18421
Lines Removed	37160	62325	59502	2823	13775
Engagement
Individuals	102	68	68	5	59
Employers	36	34	33	4	37

4.8 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
Andrew Cooper	1605	1418	101
Anshul Makkar	89	28	3
Anthony PERARD	409	251	13
Bob Liu	1	1	1
Boris Ostrovsky	1933	724	36
Cedric Bosdonnat	5	5	1
Casion Woo	3	3	1
Chao Gao	1	1	1
Chris Patterson	27	2	2
Corneliu ZUZU	391	232	14
Daniel De Graaf	787	1103	20
Daniel Kiper	160	94	7
Dario Faggioli	2130	661	50
David Vrabel	1	7	1
Derek Straka	35	2	1
Dirk Behme	29	80	4
Dongli Zhang	73	22	4
Doug Goldstein	124	69	7
Edgar E. Iglesias	139	48	8
Elena Ufimtseva	1	1	1
Emanuel Czirai	14	1	1
Euan Harris	24	8	3
Feng Wu	1	1	1
George Dunlap	266	415	10
Haozhong Zhang	15	23	2
He Chen	152	50	2
Ian Jackson	46	91	13
Jacob Pan	28	0	1
Jan Beulich	4540	3049	164
Jiandi An	1	1	1
Jim Fehlig	6	2	1
Joao Martins	212	36	5
Jonathan Daugherty	2	2	2
Juergen Gross	2888	2178	49
Julien Grall	3441	2024	112
Kai Huang	24	22	1
Konrad Rzeszutek Wilk	2219	1064	50
Kyle Huey	100	6	2
Lan Tianyu	11	6	2
Lars Kurth	534	14	6
Len Brown	160	1	3
Luwei Kang	60	1	2
Marek Marczykowski-Górecki	45	1	3
Meng Xu	13	6	4
Mihai Dontu	58	2	1
Olaf Hering	26	2	2
Paul Durrant	192	137	3
Paul Lai	43	30	1
Paulina Szubarczyk	317	115	7
Peng Fan	6	11	6
Quan Xu	774	415	18
Razvan Cojocaru	410	125	7
Roger Pau Monne	153	75	16
Ronald Rojas	13	13	1
Ross Lagerwall	155	1	1
Rusty Bird	18	1	1
Shanker Donthineni	341	158	15
Shannon Zhao	782	43	18
Stefano Stabellini	47	6	5
Suravee Suthikulpanit	109	46	3
Tamas K Lengyel	1181	455	19
Tianyang Chen	56	50	2
Trammell Hudson	2	2	1
Vitaly Kuznetsov	8	0	1
Wei Chen	558	9	6
Wei Liu	42518	44048	117
Zhi Wang	321	4	1

4.8 Hypervisor Related Code Contributions ^{[ 3 ]}

Breakdown by Individual

Note that the table below does not cover contributions to Linux, NetBSD, FreeBSD, QEMU, libvirt and other related projects. It lists contributors to mini-os (formerly part of xen.git), osstest (our test code and test cases), raisin (a deployment and test tool) and livepatch-build-tools (tools to builld livepatch payloads).

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
Ian Jackson	3452	745	182
Juergen Gross	3778	1792	58
Konrad Rzeszutek Wilk	24	6	7
Ross Lagerwall	99	28	5
Wei Liu	713	252	28

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
Andrey Grodzovsky	2	4	1
Anthony PERARD	6	7	2
Arnd Bergmann	3	3	1
Bryan Drewery	1	1	1
Ben Chalmers	88	25	5
Bhaktipriya Shridhar	3	25	2
Bob Liu	96	92	4
Manuel Bouyer	57	57	2
Bruce Rogers	1	1	1
Cao Jin	2	3	1
Christoph Hellwig	0	1	1
Christophe Ricard	19	17	4
Dan Williams	1	2	1
David Buches	9	1	1
David S. Miller	2	107	3
David Vrabel	297	411	6
Dmitry Torokhov	0	0	1
Dongli Zhang	4	4	2
Emil Condrea	661	583	13
Eric Blake	5	4	2
Eytan Heidingsfeld	5	0	1
Fabian Frederick	1	1	1
Fam Zheng	2	6	2
Filipe Manco	30	16	1
Gerd Hoffmann	3	0	1
Jan Beulich	108	151	21
Jaromír Dolecek	14	11	1
Jens Axboe	0	0	1
John Baldwin	2	0	1
Jung-uk Kim	0	0	1
Joerg Wunsch	4	1	1
John Snow	0	2	1
Juergen Gross	616	371	21
Kamil Rytarowski	72	5	1
KarimAllah Ahmed	11	84	1
Kevin Wolf	1	1	1
Konstantin Belousov	8	0	1
Robert Elz	9	1	1
Krzysztof Kozlowski	13	13	1
Linus Torvalds	0	0	16
Marc-Andre Lureau	38	41	6
Markus Armbruster	12	14	3
Maxime Villard	327	384	12
Masanobu SAITOH	71	70	2
Muhammad Falak R Wani	3	3	1
Nonaka Kimihiro	8	2	1
Olaf Hering	30	1	2
Owen Smith	2251	3552	22
Ryota Ozaki	2	3	1
Paul Durrant	11274	7362	127
Paul Gortmaker	1	1	1
Paulina Szubarczyk	162	5	1
Peter Maydell	0	0	3
Radim Krčmář	6	0	1
Ross Lagerwall	43	25	2
Roger Pau Monné	1599	87	8
Sebastian Andrzej Siewior	12	22	1
Shannon Zhao	379	165	9
Stefano Stabellini	2	2	1
Thomas Huth	1	1	1
Vitaly Kuznetsov	34	11	7
Vlastimil Babka	2	2	1
Wei Liu	6	0	1
Wei Yongjun	2	11	1

4.8 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
105 others (less than 10 review comments each)	300
Andrew Cooper	651
Andrii Anisov	21
Anshul Makkar	16
Anthony Perard	42
Bob Liu	20
Boris Ostrovsky	269
Corneliu Zuzu	88
Daniel De Graaf	35
Daniel Kiper	82
Dario Faggioli	124
David Vrabel	77
Dirk Behme	50
Doug Goldstein	35
Feng Wu	65
George Dunlap	215
Greg Kurz	10
Ian Jackson	204
Jan Beulich	1310
Joao Martins	26
Juergen Gross	159
Julien Grall	644
Kevin Tian	85
Konrad Wilk	394
Kyle Huey	27
Lars Kurth	40
Luis R. Rodriguez	22
Luwei Kang	10
Meng Xu	11
Michael Turquette	11
Mihai Donțu	16
Olaf Hering	19
Oleksandr Andrushchenko	48
Paul Durrant	64
Paulina Szubarczyk	14
Peng Fan	14
Quan Xu	31
Razvan Cojocaru	97
Roger Pau Monné	91
Ross Lagerwall	36
Samuel Thibault	77
Sergej Proskurin	125
Shanker Donthineni	39
Shannon Zhao	74
Stefano Stabellini	271
Tamas Lengyel	157
Tim Deegan	40
Wei Liu	643
Yi Y Sun	20
Yu Zhang	31

Footnotes

^{[ 1 ]} Includes the following repos: xen, mini-os, osstest, raisin, livepatch-build-tools
^{[ 2 ]} Includes the following repos: xen
^{[ 3 ]} Includes the following repos: mini-os, osstest, raisin, livepatch-build-tools
^{[ 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