It's that time of the development cycle again: the 2.6.27 kernel, if not
yet released by the time you read this, will be shortly. Various other LWN
articles have looked at features found in this release; here we will look
at where that code came from.
As of 2.6.27-rc9, a total of 10,604 non-merge changesets had been
added to the mainline for the 2.6.27 kernel; those patches added a total of
826,000 lines of code while removing 608,000, for a net growth of 217,000
lines. There were 1,109 developers who contributed to 2.6.27, representing
over 150 employers. 376 of those developers contributed a single patch
during this development cycle.
The most active developers for 2.6.27 were:
|Most active 2.6.27 developers|
|David S. Miller||206||1.9%|
|By changed lines|
|Luis R. Rodriguez||31825||2.8%|
|David S. Miller||8621||0.8%|
On the changeset side, Ingo Molnar ended up on top by virtue of the
creation of large numbers of mostly x86-related changes, including a big
subarchitecture reorganization; Ingo's count also includes the addition of
ftrace, though much of that code was written by others. Bartlomiej
Zolnierkiewicz continues to rework the old IDE layer, and Adrian Bunk, as
always, energetically cleans up code all over the tree. David Miller's total
includes the multiqueue networking code and a lot of other changes; Alan
Cox did a lot of TTY work and big kernel lock removal.
Your editor was disappointed to come in at #23, and, thus, off the bottom
of the table. Time to send in some quick white space fixes. More
seriously, though, it's worth noting that there are relatively few patches
of the "trivial change" variety in the mix this time around.
If we look at changed lines, Paul Mackerras comes out on top as the result
of a single patch removing the obsolete ppc architecture.
David Woodhouse reworked the management of firmware throughout the driver tree.
Jean-François Moine brought the GSPCA webcam drivers into the tree,
then put vast amounts of effort into cleaning them up. Artem Bityutskiy
added the UBIFS flash filesystem, and Luis Rodriguez merged the ath9k
If we look at the companies behind this work, we get the following results
(note that, as always, these results are somewhat approximate):
|Most active 2.6.27 employers|
|By lines changed|
There are not too many surprises in this table - in particular, the list of
companies at the top tends not to change very much. That said, a few
things are worthy of note. One is that Sun Microsystems has made its first
appearance on this list. People complain about this company, but Sun's
engineers have been quietly fixing things all over the tree. Broadcom is
another company with a mixed reputation in the Linux community, but
Broadcom is happy to provide support for some of its network adapters.
Nokia's strong showing in the lines-changed table results primarily from the
contribution of the UBIFS filesystem.
The most welcome change, though, is the first appearance of Atheros on this
list. Atheros is a company which has quickly moved from a position of
complete non-cooperation to one of supporting all of its hardware in the
mainline kernel. To say that this is an encouraging development would be an
All told, the 2.6.27 development cycle shows that the process continues at
full pace in a seemingly healthy state. Developers from all over the
industry are all working together to make the kernel better for all. The
number of companies which see participation in the process as being in
their interest is growing, as is the number of developers who contribute
patches. The Linux kernel, it seems, is in good shape.
to post comments)