1.release frequency
Kernel-Version Release-Date Days-of-Development
2.6.11 2005-03-02 69
2.6.12 2005-05-17 108
2.6.13 2005-08-28 73
2.6.14 2005-10-27 61
2.6.15 2006-01-02 68
2.6.16 2006-03-19 77
2.6.17 2006-06-17 91
2.6.18 2006-09-19 95
2.6.19 2006-11-29 72
2.6.20 2007-02-04 68
2.6.21 2007-04-25 81
2.6.22 2007-07-08 75
2.6.23 2007-10-09 94
2.6.24 2008-01-24 108
2.6.25 2008-04-16 83
2.6.26 2008-07-13 88
2.6.27 2008-10-09 88
2.6.28 2008-12-24 76
2.6.29 2009-03-23 89
2.6.30 2009-06-09 78
2.6.31 2009-09-09 92
2.6.32 2009-12-02 84
2.6.33 2010-02-24 84
2.6.34 2010-05-15 81
2.6.35 2010-08-01 77
2. rate of change
Kernel-Version Changes(Patches)
2.6.11 3,616
2.6.12 5,047
2.6.13 3,904
2.6.14 3,627
2.6.15 4,959
2.6.16 5,369
2.6.17 5,727
2.6.18 6,323
2.6.19 6,685
2.6.20 4,768
2.6.21 5,016
2.6.22 6,526
2.6.23 6,662
2.6.24 9,836
2.6.25 12,243
2.6.26 9,941
2.6.27 10,628
2.6.28 9,048
2.6.29 11,678
2.6.30 11,989
2.6.31 10,883
2.6.32 10,989
2.6.33 10,871
2.6.34 9,443
2.6.35 9,801
3.changes per hour
Kernel-Version Changes-Per-Hour
2.6.11 2.18
2.6.12 1.95
2.6.13 2.23
2.6.14 2.48
2.6.15 3.04
2.6.16 2.91
2.6.17 2.62
2.6.18 2.22
2.6.19 3.87
2.6.20 2.92
2.6.21 2.58
2.6.22 3.63
2.6.23 2.95
2.6.24 3.79
2.6.25 6.15
2.6.26 4.71
2.6.27 5.03
2.6.28 4.96
2.6.29 5.47
2.6.30 6.40
2.6.31 4.93
2.6.32 5.46
2.6.33 5.39
2.6.34 4.86
2.6.35 5.30
4.stable updates
Kernel-Version Total-Updates Fixes
2.6.11 12 79
2.6.12 6 53
2.6.13 5 44
2.6.14 7 96
2.6.15 7 110
2.6.16 62 1053
2.6.17 14 191
2.6.18 8 240
2.6.19 7 189
2.6.20 21 447
2.6.21 7 162
2.6.22 19 379
2.6.23 16 302
2.6.24 7 246
2.6.25 20 492
2.6.26 8 321
2.6.27 53 1553
2.6.28 10 613
2.6.29 6 383
2.6.30 10 419
2.6.31 14 826
2.6.32 21 1793
2.6.33 7 883
2.6.34 7 601
2.6.35 4 228
5.kernel source size
Kernel-Version Files Lines
2.6.11 17,090 6,624,076
2.6.12 17,360 6,777,860
2.6.13 18,090 6,988,800
2.6.14 18,434 7,143,233
2.6.15 18,811 7,290,070
2.6.16 19,251 7,480,062
2.6.17 19,553 7,588,014
2.6.18 20,208 7,752,846
2.6.19 20,936 7,976,221
2.6.20 21,280 8,102,533
2.6.21 21,614 8,246,517
2.6.22 22,411 8,499,410
2.6.23 22,530 8,566,606
2.6.24 23,062 8,859,683
2.6.25 23,813 9,232,592
2.6.26 24,273 9,411,841
2.6.27 24,356 9,630,074
2.6.28 25,276 10,118,757
2.6.29 26,702 10,934,554
2.6.30 27,911 11,560,971
2.6.31 29,143 11,970,124
2.6.32 30,504 12,532,677
2.6.33 31,584 12,912,684
2.6.34 32,316 13,243,582
2.6.35 33,335 13,468,253
6. lines added-deleted-modified per day
Kernel-Version Lines-Added-Per-Day Lines-Deleted-Per-Day Lines-Modified-Per-Day
2.6.11 3,224 1,360 1,290
2.6.12 2,375 951 949
2.6.13 4,443 1,553 1,711
2.6.14 4,181 1,637 1,726
2.6.15 5,614 3,454 2,219
2.6.16 3,853 1,388 1,649
2.6.17 3,635 2,469 1,329
2.6.18 3,230 1,497 1,096
2.6.19 6,013 2,900 1,862
2.6.20 3,120 1,342 1,013
2.6.21 3,256 1,479 982
2.6.22 6,067 2,694 1,523
2.6.23 3,747 3,034 1,343
2.6.24 6,893 4,181 1,563
2.6.25 7,980 3,488 2,430
2.6.26 5,698 3,662 1,815
2.6.27 12,270 9,791 2,102
2.6.28 12,105 5,707 1,850
2.6.29 14,678 5,516 2,454
2.6.30 12,993 4,958 2,830
2.6.31 9,408 4,962 1,635
2.6.32 12,086 5,388 2,387
2.6.33 8,925 4,379 2,841
2.6.34 6,667 2,580 1,568
2.6.35 7,896 5,037 1,802
7.who is doing the work - number of developers and companies
Kernel-Version Number-of-Developers Number-of-Known-Companies
2.6.11 389 68
2.6.12 566 90
2.6.13 545 94
2.6.14 553 90
2.6.15 612 108
2.6.16 709 111
2.6.17 726 120
2.6.18 815 133
2.6.19 801 128
2.6.20 673 138
2.6.21 767 143
2.6.22 870 180
2.6.23 912 181
2.6.24 1,057 193
2.6.25 1,123 232
2.6.26 1,027 203
2.6.27 1,021 187
2.6.28 1,075 212
2.6.29 1,180 233
2.6.30 1,150 245
2.6.31 1,166 221
2.6.32 1,248 259
2.6.33 1,196 226
2.6.34 1,150 195
2.6.35 1,187 184
All 6,117 659
8.who is doing the work - individual developers
Name Number-of-Changes Percent-of-Changes
David S. Miller 2533 1.3%
Ingo Molnar 2273 1.2%
Al Viro 2238 1.2%
Takashi Iwai 2120 1.1%
Bartlomiej Zolnierkiewicz 2014 1.1%
Adrian Bunk 1918 1.0%
Paul Mundt 1793 1.0%
Tejun Heo 1691 0.9%
Ralf Baechle 1577 0.8%
Greg Kroah-Hartman 1506 0.8%
Andrew Morton 1473 0.8%
Alan Cox 1455 0.8%
Russell King 1443 0.8%
Thomas Gleixner 1389 0.7%
Mauro Carvalho Chehab 1381 0.7%
Johannes Berg 1334 0.7%
Christoph Hellwig 1247 0.7%
Ben Dooks 1214 0.6%
Patrick McHardy 1205 0.6%
Andi Kleen 1183 0.6%
Jean Delvare 1180 0.6%
Randy Dunlap 1171 0.6%
Trond Myklebust 1022 0.5%
Stephen Hemminger 1004 0.5%
Hans Verkuil 999 0.5%
Herbert Xu 969 0.5%
David Woodhouse 967 0.5%
Peter Zijlstra 951 0.5%
Alexey Dobriyan 949 0.5%
David Brownell 901 0.5%
9.who is sponsoring the work
Company-Name Number-of-Changes Percent-of-Total
None 35,663 18.9%
Red Hat 23,356 12.4%
Novell 13,120 7.0%
IBM 13,026 6.9%
Unknown 12,060 6.4%
Intel 11,028 5.8%
consultants 4,817 2.6%
Oracle 4,367 2.3%
Renesas Technology 2,621 1.4%
The Linux Foundation 2,488 1.3%
academics 2,464 1.3%
SGI 2,450 1.3%
Fujitsu 2,293 1.2%
Parallels 2,226 1.2%
Analog Devices 1,955 1.0%
Nokia 1,896 1.0%
HP 1,854 1.0%
MontaVista 1,821 1.0%
Google 1,565 0.8%
AMD 1,518 0.8%
Freescale 1,501 0.8%
linutronix 1,470 0.8%
MIPS Technologies 1,410 0.7%
NetApp 1,322 0.7%
Marvell 1,241 0.7%
Atheros Communications 1,234 0.7%
Astaro 1,222 0.6%
Broadcom 1,130 0.6%
QLogic 1,076 0.6%
NTT 1,068 0.6%
10.who is reviewing the work - since 2.6.30 Signed-off-by
Name Signoff Lines Percent of Total Subsystem
David S. Miller 5153 10.9% Networking, IDE, Sparc
John W. Linville 3611 7.6% Wireless Networking
Greg Kroah-Hartman 3556 7.5% USB, staging, driver core
Andrew Morton 3042 6.4% Everything
Ingo Molnar 2887 6.1% x86 architecture
Mauro Carvalho Chehab 2353 5.0% Video for Linux (Media Devices)
James Bottomley 1294 2.7% SCSI
Dave Airlie 876 1.9% DRM (Video Drivers)
Paul Mundt 654 1.4% SuperH architecture
Len Brown 651 1.4% ACPI
Takashi Iwai 647 1.4% Sound
Russell King 616 1.3% ARM architecture
Jeff Kirsher 607 1.3% Intel network drivers
Linus Torvalds 600 1.3% Everything
Avi Kivity 573 1.2% KVM
Benjamin Herrenschmidt 534 1.1% PowerPC architecture
Mark Brown 526 1.1% System-on-a-chip Sound
Reinette Chatre 524 1.1% Intel wireless drivers
Ralf Baechle 502 1.1% MIPS architecture
Peter Anvin 495 1.0% x86 architecture
Jens Axboe 487 1.0% Block layer
Jesse Barnes 454 1.0% PCI
Mike Frysinger 441 0.9% Blackfin architecture
Tony Lindgren 432 0.9% OMAP architecture
Eric Anholt 425 0.9% Intel video drivers
Ben Dooks 412 0.9% Samsung/ARM architecture
David Woodhouse 406 0.9% JFFS2, Embedded, MTD, IOMMU
Martin Schwidefsky 387 0.8% S390 architecture
Kevin Hilman 360 0.8% TI Davinci architecture
Jiri Kosina 332 0.7% HID, Trivial
11.associating signoffs with employers
Company-Name Signoff-Lines Percent-of-Total
Red Hat 17,815 37.7%
Novell 6,345 13.4%
Intel 4,365 9,2%
Google 3,133 6.6%
none 2,268 4.8%
IBM 1,663 3.5%
consultant 1,153 2.4%
Oracle 870 1.8%
Renesas Technology 674 1.4%
The Linux Foundation 600 1.3%
Analog Devices 541 1.1%
Nokia 540 1.1%
Wind River 539 1.1%
Wolfson Microelectronics 526 1.1%
Atomide 432 0.9%
Simtec 408 0.9%
Marvell 406 0.9%
NetApp 351 0.7%
unknown 247 0.5%
Cisco 245 0.5%
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