LINBIT is #27 of the world’s leading kernel contributors

Who writes Linux

See here the top 30 companies which contribute to the linux kernel.

Company Changes Total
No company 12,550 13.6%
Red Hat 9,483 10.2%
Intel 8,108 8.8%
Texas Instruments 3,814 4.1%
Linaro 3,791 4.1%
SUSE 3,212 3.5%
Unknown 3,032 3.3%
IBM 2,858 3.1%
Samsung 2,415 2.6%
Google 2,555 2.4%
Vision Engraving Systems 2,107 2.3%
Consultants 1,529 1.7%
Wolfson Microelectronics 1,516 1.6%
Oracle 1,248 1.3%
Broadcom 1,205 1.3%
Company Changes Total
NVidia 1,192 1,3%
Freescale 1,127 1.2%
Ingics Technology 1,075 1.2%
Renesas Electronics 1,010 1.1%
Qualcomm 965 1.0%
Cisco 871 0.9%
The Linux Foundation 840 0.9%
Academics 831 0.9%
AMD 820 0.9%
Inktank Storage 709 0.8%
NetApp 707 0.8%
LINBIT 705 0.8%
Fujitsu 694 0.7%
Parallels 684 0.7%
ARM 664 0.7%

Source: Linux Kernel Development Whitepaper, The Linux Foundation

Who controls the quality

Due to quality control, new Linux kernel patches are going through a signoff process before releasing. The table below shows which companies are taking over quality control.

Company Signoffs Percent
Red Hat 20,369 25.7%
The Linux Foundation 9,561 12.0%
Intel 7,244 9.1%
Google 4,605 5.8%
Keine 4,155 5.2%
SUSE 3,275 4.1%
Samsung 2,684 3.4%
Wolfson Microelectronics 2,474 3.1%
Texas Instruments 2,372 3.0%
IBM 2,245 2.8%
Company Signoffs Percent
Linaro 2,231 2.8%
Parallels 1,258 1.6%
LINBIT 930 1.2%
Fusion-io 815 1.0%
Broadcom 807 1.0%
Consultants 752 0.9%
OLPC 640 0.8%
Wind River 595 0.7%
Pengutronix 587 0.7%
Marvell 580 0.7%

Source: Linux Kernel Development Whitepaper, The Linux Foundation

DRBD is Linux mainline since kernel 2.6.33

Linux kernel development is known for short and loose bound release cycles. Since kernel 2.6.33 DRBD is part of linux and very recently the newest DRBD 8.4.3 was pushed into 3.10.

Kernel Version Release Date Days of Development Linux-Release DRBD-Release
3.0 2011-07-21 64 2.6.33 8.3.7
3.1 2011-10-24 95 2.6.34 8.3.7
3.2 2011-12-31 68 2.6.35 8.3.8
3.3 2012-03-18 74 2.6.36 8.3.8.1
3.4 2012-05-20 63 2.6.37 8.3.9
3.5 2012-07-21 62 2.6.38 8.3.9
3.6 2012-09-30 71 2.6.39 8.3.10
3.7 2012-12-10 71 3.0 – 3.4 8.3.11
3.8 2013-02-18 70 3.5 – 3.7 8.3.13
3.9 2013-04-28 69 3.8 & 3.9 8.4.2
3.10 2013-06-30 63 3.10 8.4.3

Source: Linux Kernel Development Whitepaper, The Linux Foundation, drbd.org

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