Linux Gained Some Weight The Past Two Weeks: Around 200,000 Lines
If you didn't already read it, this morning I published my usual feature overview of the new Linux 4.7 kernel features that covers all of the big additions for Linux 4.7. Check that out for details, this article is just about the code-base size.
This morning on Linux Git I ran CLOC to get an estimate for the latest stats about the kernel's code-base.
Linux Git 2016-05-29: --------------------------------------------------------------------------------------- Language files blank comment code --------------------------------------------------------------------------------------- C 23045 2222971 2045822 11328147 C/C++ Header 17558 426824 729449 2797662 Assembly 1415 47390 110839 241709 XML 181 3436 243 50370 make 2192 8266 7870 34967 Perl 47 4622 3597 24340 Bourne Shell 190 2011 3367 10710 Python 44 1578 1677 8568 yacc 8 655 355 4327 HTML 4 509 0 4284 lex 8 299 288 1891 Bourne Again Shell 48 390 261 1612 C++ 1 231 58 1581 awk 10 132 129 1130 ASP.Net 16 21 0 571 NAnt script 2 128 0 475 Pascal 3 49 0 231 Lisp 1 63 0 218 Objective C++ 1 55 0 189 m4 1 15 1 95 XSLT 6 13 27 71 vim script 1 3 12 27 Windows Module Definition 1 0 0 8 --------------------------------------------------------------------------------------- SUM: 44783 2719661 2903995 14513183 ---------------------------------------------------------------------------------------CLOC pegs the lines of code at 14,513,183 while taking out comments, blank lines, etc. Though CLOC may not be 100% accurate as it does indicate a few lines of ASP.net code and such in the kernel, but provides a concise overview anyhow. The CLOC numbers are also fun for looking at the amount of Assembly still in the kernel (241,709 lines) relative to C (11,328,147 and 2,797,662 in headers).
Comparing that to running CLOC on the Linux v4.6 tag (14321350 code lines), that puts the kernel as gaining just under 200,000 lines of code for 4.7 (191,833 to be exact).
This is only somewhat larger than Linux 4.5 that clocked in at 14,141,508, or a 179k LOC difference between 4.5 and 4.6.
Of course, with some Git magic we can get a look at how much code really changed around between v4.6 and Git master: 9317 files changed, 562804 insertions(+), 270510 deletions(-). That's of course including documentation, Kconfig changes, etc. Comparing Linux 4.6 to Git master, that's more than a half million lines of code inserted and just over a quarter million lines of code deleted.
Representing a lot of this new code in Linux 4.7 comes down to the AMDGPU Polaris support. The AMDGPU changes amounted to more than 61,000 lines of new code in Linux 4.7: almost a third of the new lines added during the 4.7 merge window for the entire kernel. That's a lot to add AMD Polaris GPU support, but it will get even bigger!
In Linux 4.7 the Polaris support is using the existing AMDGPU display code while in Linux 4.8 or later is when the DAL display abstraction layer is coming to AMDGPU. AMDGPU's DAL code will allow for new display features and is based upon the proprietary driver code-base. DAL will make it possible to support FreeSync, HDMI 2.0, and more for this open-source kernel driver. But this yet-to-land DAL code weighs in at over 93,000 lines of code! That's part of the reason why it wasn't sent in for Linux 4.7 as the developers are still cleaning it up, removing some of the abstractions, etc. That cleaned up code will be smaller than when it was when originally published, but it's still going to be another significant addition to the kernel's code-base when it lands in a future cycle.
Anyhow, those are the numbers if you are curious about the size of Linux 4.7 so far. At least with the increased line count comes a ton of exciting Linux 4.7 features.
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