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
