The release of the
prepatch indicates that this development cycle is headed toward a close,
even if Linus thinks that a -rc8 will be necessary. As has become
traditional, LWN has taken a look at some statistics related to this cycle
and where the code came from.
As of this writing, 10,500 non-merge commits have found their way into
2.6.33 - fairly normal by recent standards. These changes added almost
900,000 lines while deleting almost 520,000 others; as a result, the kernel
grew by a mere 380,000 lines this time around. According to the most recent regression list,
97 regressions have been reported in 2.6.33, of which 20 remain
Some 1,152 developers contributed code to 2.6.33. The most active of those
|Most active 2.6.33 developers|
|Arnaldo Carvalho de Melo||138||1.3%|
|Luis R. Rodriguez||130||1.2%|
|Eric W. Biederman||97||0.9%|
|By changed lines|
|Henk de Groot||50355||4.4%|
|Arnaldo Carvalho de Melo||7217||0.6%|
While some of the usual names appear at the top of this list, there are
some newcomers as well. Ben Hutchings did a lot of work with network
drivers, including the addition of the SolarFlare SFC9000 driver (which has
several co-authors). Frederic Weisbecker has been active in a number of
areas, adding the hardware breakpoints code, removing the big kernel lock
from the reiserfs filesystem, and working with tracing and the perf tool.
Arnaldo Carvalho de Melo's work is almost all with the perf events subsystem and
the perf tool in particular. Luis Rodriguez continues to work all over the
wireless driver subsystem, and with the Atheros drivers in particular, and
Masami Hiramatsu's largest contribution is the dynamic probing work.
In the "lines changed" column, Bartlomiej Zolnierkiewicz continues to work
in fixing up some wireless drivers in the staging tree, deleting a lot of
code in the process; he also continues his IDE driver work. Henk de Groot
added the Agere driver for HERMES II chipsets, Jerry Chuang added the
Realtek rtl8192u driver, and Ben Skeggs added much of the Nouveau driver.
Contributions to 2.6.33 came from 182 employers that your editor was able
to identify. The most active of those are:
|Most active 2.6.33 employers|
|By lines changed|
|JiangSu Lemote Corp.||11439||1.0%|
|Universal Scientific Industrial Co.||9194||0.8%|
As usual, Red Hat maintains its position at the top of the list, but others
are gaining; we may yet see a day when Red Hat is just one of several major
contributors. Some readers may be surprised to see Broadcom near the top
of the list, given that this company's reputation for contribution is not
the best. The truth of the matter is that Broadcom has several developers
contributing to various drivers in the networking and SCSI subsystems; it's
only in the wireless realm that the trouble starts.
For the fun of it, your editor typed the "changeset percent"
numbers for the last ten releases into a spreadsheet and got this plot:
The percentages are surprisingly stable over the course of almost three
years. The most obviously identifiable trends, perhaps, are the steady
increases in the contributions from Intel and Nokia.
All told, the process continues to function smoothly. The occasional
complaint about certain companies not fully participating in the process
notwithstanding, the picture is one of hundreds of companies cooperating to
a high degree to create the Linux kernel despite their fierce competition
elsewhere. The significant percentage of code coming from developers
working on their own time shows that Linux is not just a corporate
phenomenon, though. We have built a development community which is able to
incorporate the interests and work of an astonishingly wide variety of
people into a single kernel.
As always, thanks are due to Greg Kroah-Hartman, who has done a great deal of work to reduce the size of the "(Unknown)" entries in the tables above.
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