Xen Project 4.9 Acknowledgements

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Revision as of 16:08, 26 June 2017 by Lars.kurth (talk | contribs) (4.9 Hypervisor Related Code Contributions [ 3 ])

Note that the acknowledgements have been created based on 4.9.0-rc9, which is expected to be the final RC for Xen 4.9.0 (with the exception of some security fixes under embargo). If there is another release candidate, data needs to be updated.

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 4.8 with Xen 4.9. 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 4.9 Hypervisor Total.

Attribute 4.8 Hypervisor Total [ 1 ] 4.9 Hypervisor Total [ 1 ] 4.9 Hypervisor Core [ 2 ] 4.9 Hypervisor Other [ 3 ] Drivers and Devices (other projects) [ 4 ]
Release Cycle 161 days
124 dev window/days [ 6 ]
5.3 months
203 days [ 7 ]
128 dev window/days [ 6 ]
6.3 months
Development Velocity
Changesets 1245 1549 (+19.6%) 1316 233 285
Series (=Features) [ 5 ] 575 481 (-19.5%)
Average Size of Feature 2.17 3.22 (+32.6%)
Changes / Day 7.7 7.6 (-0.9%)
Changes / Dev Day [ 6 ] 10.0 12.1 (+17.4%)
Features / Day [ 5 ] 3.6 2.4 (-51.9%)
Code Review Statistics
Review Comments [ 5 ] 6960 8349 (+16.6%)
Review Comments / Day [ 5 ] 43.6 41.1 (-6.0%)
Review Comments / Dev Day [ 6 ] 56.1 65.2 (+13.9%)
Comments / Series [ 5 ] 11.9 17.4 (+31.4%)
Code Churn
Lines Added 78899 82336 (+4.2%) 77190 5146 21558
Lines Removed 62325 47014 (-67.8%) 45320 1694 16705
Engagement
Individuals 68 85 (+20.9%) 83 10 79
Employers [ 8 ] 25 29 (+16.7%) 28 6 25


4.9 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


4.9 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), xtf.git and livepatch-build-tools (tools to builld livepatch payloads).

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
Andrew Cooper 2425 1131 50
Géza Gémes 427 29 16
Ian Jackson 1952 470 150
Jan Beulich 120 15 4
Mohit Gambhir 12 0 1
Paul Durrant 2 0 1
Ross Lagerwall 82 1 2
Simon Waterman 1 28 1
Stefano Stabellini 84 15 4
Wei Liu 41 5 4


Code Contributions to Xen Related Drivers and Devices in Linux, NetBSD, FreeBSD [ 4 ]

Breakdown by Individual

Icon todo.png To Do:

Insert data - will have to do this post the 4.9 release


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


4.9 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
119 others (less than 10 review comments each) 345
Alistair Francis 14
Andre Przywara 71
Andrew Cooper 792
Andy Lutomirski 11
Anthony Perard 13
Bhupinder Thakur 22
Boris Ostrovsky 286
Cedric Bosdonnat 11
Chao Gao 41
Dan Streetman 10
Daniel De Graaf 16
Daniel Kiper 100
Dario Faggioli 69
Doug Goldstein 82
Elena Reshetova 13
Fu Wei 10
George Dunlap 144
Géza Gémes 10
Greg Kurz 24
Grek KH 17
Haozhong Zhang 46
Ian Jackson 225
Jacob Shin 13
Jan Beulich 1634
Juergen Gross 222
Julien Grall 534
Kevin Tian 133
Konrad Wilk 179
Luis R. Rodriguez 74
Luwei Kang 11
Olaf Hering 14
Oleksandr Andrushchenko 64
Oleksandr Grytsov 11
Oleksandr Tyshchenko 24
Paul Durrant 172
Peter Zijlstra 14
Praveen Kumar 19
Quan Xu 24
Razvan Cojocaru 66
Roger Pau Monné 167
Ronald Rojas 21
Ross Lagerwall 11
Sergey Dyasli 17
Shanker Donthineni 11
Stefano Stabellini 628
Suravee Suthikulpanit 26
Tamas Lengyel 60
Thomas Garnier 28
Tim Deegan 68
Vijay Kilari 10
Waiman Long 13
Wei Liu 532
Yi Y Sun 119
Yu Zhang 51
Zhang Chen 18
Zhongze Liu 14


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 4.9.0-rc9. 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. Note that in [1] that clean-up did not happen